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1216 lines
40 KiB
Plaintext
1216 lines
40 KiB
Plaintext
\input texinfo @c -*-texinfo-*-
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@comment This is part of the netCDF documentation. See COPYRIGHT file
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@comment $Id: netcdf-cxx4.texi,v 1.2 2008/08/06 17:01:14 dmh Exp $
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@comment %**start of header
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@setfilename netcdf-cxx4.info
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@settitle NetCDF C++ Interface Guide
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@setchapternewpage odd
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@setcontentsaftertitlepage
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@c Combine the variable and function indices.
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@synindex vr cp
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@synindex fn cp
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@c %**end of header
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@c version.texi is automatically generated by automake and contains
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@c defined variables VERSION, UPDATED, UPDATED-MONTH.
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@include version-cxx4.texi
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@include defines.texi
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@ifinfo
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@dircategory netCDF scientific data format
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@direntry
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* netcdf-cxx4: (netcdf-cxx4). @value{cxx4-man}
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@end direntry
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@end ifinfo
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@titlepage
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@title @value{cxx-man}
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@subtitle Class Documentation
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@subtitle Version @value{VERSION}
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@subtitle @value{UPDATED}
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@author Russ Rew, Shanna-Shaye Forbes, Ed Hartnett
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@author Unidata Program Center
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@page
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@vskip 0pt plus 1filll
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@insertcopying
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@end titlepage
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@ifnottex
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@node Top, Introduction, (dir), (dir)
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@top @value{cxx-man}
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This document describes the netCDF C++ API. It applies to netCDF
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version @value{VERSION}. This document was last updated in
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@value{UPDATED}.
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The netCDF library provides an application- and machine-independent
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interface to self-describing, array-oriented data. It supports an
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abstract view of such data as a collection of named variables and
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their attributes, and provides high-level access to data that is
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faithful to the abstraction. This on-line document describes the C++
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interface to netCDF.
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The first part of this master menu lists the major nodes in this Info
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document. The rest of the menu lists all the lower level nodes in the
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document.
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For a complete description of the netCDF format and utilities see
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@ref{Top,, , netcdf, @value{n-man}}.
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@end ifnottex
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@menu
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* Introduction::
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* NetCDF Classes::
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* Auxiliary Classes::
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* Combined Index::
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@detailmenu
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--- The Detailed Node Listing ---
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Introduction
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* Class Hierarchy::
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* Auxiliary Types and Constants::
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NetCDF Classes
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* Class NcFile:: Files
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* Class NcDim:: Dimensions
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* Class NcTypedComponent:: Operations common to variables and attributes
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* Class NcVar:: Variables
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* Class NcAtt:: Attributes
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Auxiliary Classes
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* Class NcValues::
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* Class NcError::
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@end detailmenu
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@end menu
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@node Introduction, NetCDF Classes, Top, Top
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@unnumbered Introduction
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@cindex requirements of C++ interface
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The main requirements for the design of the C++ interface are:
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@itemize @bullet
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@item
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to provide the functionality of the C interface;
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@item
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to provide type safety by eliminating all use of @code{void*} pointers; and
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@item
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to provide an interface that is simpler to use than the C interface.
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@end itemize
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Some of the features of the C++ interface are:
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@itemize @bullet
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@item
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No IDs needed for netCDF's variables, dimensions, or attributes.
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@item
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No explicit open or close calls needed for netCDF files; a constructor
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opens and a destructor closes a file.
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@item
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No need to specify types for creating attributes; they will have the
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type of the value provided.
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@item
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No use of @code{void*}: values are type-checked.
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@item
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Less indirection is needed for dimensions & dimension sizes than with
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the C interface. A variable's dimensions can be provided as arguments
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when defining a variable.
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@item
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Code for data types is isolated to make the addition of new
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types easier.
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@item
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No explicit @code{ncredef} or @code{ncendef} calls are needed for
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switching between define and data modes. Whenever a mode switch is
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required, it happens implicitly.
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@end itemize
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The header file @file{netcdfcpp.h} must be included in source code files
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using this interface.
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This release provides the functionality of netCDF version
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@value{VERSION}.
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This manual assumes familiarity with Chapters 1 through 4 of the netCDF
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User's Guide, where the concepts of netCDF dimensions, variables, and
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attributes are discussed.
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@menu
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* Class Hierarchy::
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* Auxiliary Types and Constants::
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@end menu
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@node Class Hierarchy, Auxiliary Types and Constants, Introduction, Introduction
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@unnumberedsec Class Hierarchy
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@cindex class hierarchy
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The class for netCDF file objects is @code{NcFile}.
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The components of a netCDF file are dimensions, variables, and
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attributes. There is a class for each of these kinds of objects;
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@code{NcDim}, @code{NcVar}, and @code{NcAtt}. Variables and attributes
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share some common characteristics that are factored out in the
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abstract base class @code{NcTypedComponent}.
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An auxiliary class, @code{NcValues}, provides a type for arrays of values
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that are read from or written to netCDF files. Another auxiliary class,
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@code{NcError}, provides flexible facilities for handling errors.
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@example
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@group
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@code{NcFile} netCDF file
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@code{NcDim} dimension
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@code{NcTypedComponent} abstract base class
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@code{NcVar} variable
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@code{NcAtt} attribute
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@code{NcValues} abstract base class for array
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@code{NcValues_ncbyte} array of bytes
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@code{NcValues_char} array of characters
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@code{NcValues_short} array of shorts
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@code{NcValues_int} array of ints
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@code{NcValues_long} array of longs
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@code{NcValues_float} array of floats
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@code{NcValues_double} array of doubles
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@code{NcError} for error handling
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@end group
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@end example
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@node Auxiliary Types and Constants, , Class Hierarchy, Introduction
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@unnumberedsec Auxiliary Types and Constants
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@cindex auxiliary types and constants
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The netCDF classes use several auxiliary types for arguments and return
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types from member functions: @code{NcToken}, @code{NcType},
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@code{NcBool}, and @code{ncbyte}.
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@table @code
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@vindex NcToken
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@item NcToken
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Used for names for netCDF objects, in particular variable names, dimension
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names, and attribute names. Currently this is just a typedef for
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@code{const char*}.
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@vindex NcType
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@item NcType
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Used for specifying netCDF external value types. Currently this is an
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enumerated type with the following legitimate values: @code{ncByte},
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@code{ncChar}, @code{ncShort}, @code{ncInt}, @code{ncLong} (deprecated),
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@code{ncFloat}, and @code{ncDouble}.
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@vindex NcBool
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@item NcBool
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Used for the return type of some member functions. If the member
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function fails, 0 is returned, otherwise some non-zero value. Currently
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this is just a typedef for @code{unsigned int}. It will be changed to
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@code{bool} when all C++ compilers support the new @code{bool} type.
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@vindex ncbyte
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@item ncbyte
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Used to declare values of type @code{ncByte}, for 8-bit integer data.
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(This is currently a typedef for @code{unsigned char}, but it may be
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changed to a typedef for @code{signed char}, so don't depend on the
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underlying representation.)
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@end table
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@node NetCDF Classes, Auxiliary Classes, Introduction, Top
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@unnumbered NetCDF Classes
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@menu
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* Class NcFile:: Files
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* Class NcDim:: Dimensions
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* Class NcTypedComponent:: Operations common to variables and attributes
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* Class NcVar:: Variables
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* Class NcAtt:: Attributes
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@end menu
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@vindex NcFile
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@node Class NcFile, Class NcDim, NetCDF Classes, NetCDF Classes
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@unnumberedsec Class NcFile
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@code{NcFile} is the class for netCDF files,
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providing methods for netCDF file operations.
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(A previous prototype release included derived classes @code{NcOldFile},
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and @code{NcNewFile}, but these are no longer needed. Old code that
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uses NcOldFile and NcNewFile classes should still work, but new code
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should not use the deprecated NcOldFile and NcNewFile classes.)
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Some member functions return pointers to dimensions (@code{NcDim}) or
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variables (@code{NcVar}). These objects are owned by the @code{NcFile}
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they are associated with, and will be deleted automatically by the
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@code{NcFile} destructor (or by the @code{close} member function, if
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this is called earlier than the destructor), so users should not delete
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these. Member functions that return pointers to attributes
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(@code{NcAtt}) pass ownership to the calling function; users
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should delete attributes when they are finished with them.
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Member functions that return @code{NcBool} yield @code{TRUE} on success
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and @code{FALSE} on failure. Member functions that return a pointer
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value return a @code{NULL} pointer on failure.
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This class interface hides the distinction in the C and Fortran
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interfaces between @dfn{define mode} (when dimensions, variables, or
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attributes are being defined or renamed), and @dfn{data mode} (when data
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values are being accessed), by automatically switching between the modes
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when necessary. Be aware that switching from accessing data to adding
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or renaming dimensions, variables and attributes can be expensive, since
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it may entail a copy of the data.
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@unnumberedsubsec Public Member Functions
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@table @code
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@findex NcFile
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@findex NcFile::NcFile
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@item NcFile( const char * path, FileMode = ReadOnly )
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The constructor creates a new netCDF file or opens an existing netCDF
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file.
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The path argument may be an OPenDAP DAP URL if DAP support is enabled.
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The @code{FileMode} argument can be any of @code{ReadOnly} (the
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default) to open an existing file for reading, @code{Write} to open an
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existing file for reading or writing, @code{Replace} to create a new
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empty file even if the named file already exists, or
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@code{New} to create a new file only if the named file does not already
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exist.
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The constructor will not fail, but in the case of a bad path name,
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improper permissions, or if the file already exists and you have
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specified @code{FileMode} as @code{New}, no netCDF file will be created
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or opened. If the constructor fails to create or open a netCDF file, a
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subsequent call to the @code{is_valid()} member function will return
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@code{False}.
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@findex ~NcFile
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@findex NcFile::~NcFile
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@item ~NcFile( void )
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Destructor. The file is closed and all resources associated with it are
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released, including the associated @code{NcVar} and @code{NcDim}
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objects. If you wish to close the file earlier, you may explicitly call
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the @code{close} member function; a subsequent destructor call will work
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properly.
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@findex close
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@findex NcFile::close
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@item NcBool close( void )
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Close netCDF file earlier than it would be closed by the @code{NcFile}
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destructor.
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@findex is_valid
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@findex NcFile::is_valid
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@item NcBool is_valid( void ) const
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Returns @code{TRUE} if valid netCDF file, @code{FALSE} otherwise (e.g.
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if constructor could not open file).
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@findex num_dims
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@findex NcFile::num_dims
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@item int num_dims( void ) const
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Returns the number of dimensions in the netCDF file.
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@findex num_vars
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@findex NcFile::num_vars
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@item int num_vars( void ) const
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Returns the number of variables in the netCDF file.
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@findex num_atts
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@findex NcFile::num_atts
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@item int num_atts( void ) const
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Returns the number of global attributes in the netCDF file.
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@findex get_dim
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@findex NcFile::get_dim
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@item NcDim* get_dim(NcToken name) const
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Get a dimension by name.
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@findex get_var
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@findex NcFile::get_var
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@item NcVar* get_var(NcToken name) const
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Get a variable by name.
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@findex get_att
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@findex NcFile::get_att
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@item NcAtt* get_att(NcToken name) const
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Get a global attribute by name.
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@findex get_dim
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@findex NcFile::get_dim
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@item NcDim* get_dim(int n) const
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Get the @var{n}th dimension (beginning with the 0th).
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@findex get_var
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@findex NcFile::get_var
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@item NcVar* get_var(int n) const
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Get the @var{n}th variable (beginning with the 0th).
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@findex get_att
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@findex NcFile::get_att
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@item NcAtt* get_att(int n) const
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Get the @var{n}th global attribute (beginning with the 0th).
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@findex rec_dim
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@findex NcFile::rec_dim
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@item NcDim* rec_dim( void ) const
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Get the unlimited dimension, if any.
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@end table
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The following @code{add_} member functions put the file in @dfn{define
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mode}, so could be expensive. To avoid copying of data, invoke
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these before writing data to variables.
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@table @code
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@findex add_dim
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@findex NcFile::add_dim
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@item NcDim* add_dim(NcToken dimname)
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Add an unlimited dimension named @code{dimname} to the netCDF file.
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@findex add_dim
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@findex NcFile::add_dim
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@item NcDim* add_dim(NcToken dimname, long dimsize)
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Add a dimension named @code{dimname} of size @code{dimsize}.
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@findex add_var
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@findex NcFile::add_var
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@item NcVar* add_var(NcToken varname, NcType type, const NcDim*, @dots{})
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Add a variable named @code{varname} of the specified type
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(@code{ncByte}, @code{ncChar}, @code{ncShort}, @code{ncInt},
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@code{ncFloat}, @code{ncDouble}) to the open netCDF file. The variable
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is defined with a shape that depends on how many
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dimension arguments are provided. A scalar variable would have 0
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dimensions, a vector would have 1 dimension, and so on. Supply as many
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dimensions as needed, up to 5. If more than 5 dimensions are required,
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use the n-dimensional version of this member function instead.
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@findex add_var
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@findex NcFile::add_var
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@item NcVar* add_var(NcToken varname, NcType type, int ndims, const NcDim** dims)
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Add a variable named @code{varname} of @code{ndims} dimensions and of
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the specified type. This method must be used when dealing with
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variables of more than 5 dimensions.
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@findex add_att
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@findex NcFile::add_att
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@item NcBool add_att(NcToken name, ncbyte val)
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@itemx NcBool add_att(NcToken name, char val)
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@itemx NcBool add_att(NcToken name, short val)
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@itemx NcBool add_att(NcToken name, int val)
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@itemx NcBool add_att(NcToken name, float val)
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@itemx NcBool add_att(NcToken name, double val)
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Add global scalar attributes of the specified name and with the
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supplied value.
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@item NcBool add_att(NcToken name, const char* val)
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Add global string-valued attribute with the specified name and C string
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value (terminated with a @code{\0} character).
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@findex add_att
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@findex NcFile::add_att
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@item NcBool add_att(NcToken name, int n, const ncbyte* val)
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@itemx NcBool add_att(NcToken name, int n, const char* val)
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@itemx NcBool add_att(NcToken name, int n, const short* val)
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@itemx NcBool add_att(NcToken name, int n, const int* val)
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@itemx NcBool add_att(NcToken name, int n, const float* val)
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@itemx NcBool add_att(NcToken name, int n, const double* val)
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Add global vector attributes with the specified name, length, and values.
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@findex set_fill
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@findex NcFile::set_fill
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@item NcBool set_fill(FillMode mode = Fill)
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Sets fill-mode to either @code{NcFile::Fill} or @code{NcFile::NoFill}.
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Default is @code{Fill}, in which case unwritten values are prewritten
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with appropriate type-specific or variable-specific fill values.
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@findex get_fill
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@findex NcFile::get_fill
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@item enum NcFile::FillMode get_fill( void ) const
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Returns fill mode of the file, either @code{NcFile::Fill} or
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@code{NcFile::NoFill}.
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|
@findex get_format
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|
@findex NcFile::get_format
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|
@item enum NcFile::FileFormat get_format( void ) const
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|
Returns format version of the file, either @code{NcFile::Classic},
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|
@code{NcFile:Offset64Bits}, @code{NcFile:Netcdf4}, or
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|
@code{NcFile::Netcdf4Classic}.
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|
@findex sync
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|
@findex NcFile::sync
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|
@item NcBool sync( void )
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|
Synchronizes file to disk. This flushes buffers so that readers
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|
of the file will see recent changes.
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|
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|
@findex abort
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|
@findex NcFile::abort
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|
@item NcBool abort( void )
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|
Either just closes file (if recently it has been in data mode as the
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|
result of accessing data), or backs out of the most recent sequence of
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|
changes to the file schema (dimensions, variables, and attributes).
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|
@end table
|
|
|
|
@vindex NcDim
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|
@node Class NcDim, Class NcTypedComponent, Class NcFile, NetCDF Classes
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|
@unnumberedsec Class NcDim
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|
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|
A netCDF dimension has a name and a size. Dimensions are only created and
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|
destroyed by NcFile member functions, because they cannot exist
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|
independently of an open netCDF file. Hence there are no public
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|
constructors or destructors.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
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|
@findex name
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|
@findex NcDim::name
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|
@item NcToken name( void ) const
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|
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|
Returns the name of the dimension if it exists, 0 otherwise.
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|
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|
@findex size
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@findex NcDim::size
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@item long size( void ) const
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Returns the dimension size.
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|
@findex is_valid
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|
@findex NcDim::is_valid
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|
@item NcBool is_valid( void ) const
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|
|
Returns @code{TRUE} if file and dimension are both valid, @code{FALSE}
|
|
otherwise.
|
|
|
|
@findex is_unlimited
|
|
@findex NcDim::is_unlimited
|
|
@item NcBool is_unlimited( void ) const
|
|
|
|
Returns @code{TRUE} if the dimension is the unlimited dimension,
|
|
@code{FALSE} if either not a valid netCDF file, or if the dimension is
|
|
not the unlimited dimension.
|
|
|
|
@findex rename
|
|
@findex NcDim::rename
|
|
@item NcBool rename( NcToken newname )
|
|
|
|
Renames the dimension to @code{newname}.
|
|
|
|
@findex sync
|
|
@findex NcDim::sync
|
|
@item NcBool sync( void )
|
|
|
|
If the dimension may have been renamed, make sure its name is updated.
|
|
|
|
@end table
|
|
|
|
@vindex NcTypedComponent
|
|
@node Class NcTypedComponent, Class NcVar, Class NcDim, NetCDF Classes
|
|
@unnumberedsec Class NcTypedComponent
|
|
|
|
@code{NcTypedComponent} is an abstract base class for @code{NcVar} and
|
|
@code{NcAtt} that captures the similarities between netCDF variables and
|
|
attributes. We list here the member functions that variables and
|
|
attributes inherit from @code{NcTypedComponent}, but these member
|
|
functions are also documented under the @code{NcVar} and @code{NcAtt}
|
|
classes for convenience.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
|
|
@findex name
|
|
@findex NcTypedComponent::name
|
|
@item NcToken name( void ) const
|
|
|
|
Returns the name of the variable or attribute.
|
|
|
|
@findex type
|
|
@findex NcTypedComponent::type
|
|
@item NcType type( void ) const
|
|
|
|
Returns the type of the variable or attribute. The type will be one of
|
|
@code{ncByte}, @code{ncChar}, @code{ncShort}, @code{ncInt},
|
|
@code{ncFloat}, or @code{ncDouble}.
|
|
|
|
@findex is_valid
|
|
@findex NcTypedComponent::is_valid
|
|
@item NcBool is_valid( void ) const
|
|
|
|
Returns @code{TRUE} if the component is valid, @code{FALSE} otherwise.
|
|
|
|
@findex num_vals
|
|
@findex NcTypedComponent::num_vals
|
|
@item long num_vals( void ) const
|
|
|
|
Returns the number of values for an attribute or variable. For an
|
|
attribute, this is just 1 for a scalar attribute, the number of values
|
|
for a vector-valued attribute, and the number of characters for a
|
|
string-valued attribute. For a variable, this is the product of the
|
|
dimension sizes for all the variable's dimensions.
|
|
|
|
@findex rename
|
|
@findex NcTypedComponent::rename
|
|
@item NcBool rename( NcToken newname )
|
|
|
|
Renames the variable or attribute.
|
|
|
|
@findex values
|
|
@findex NcTypedComponent::values
|
|
@item NcValues* values( void ) const
|
|
|
|
Returns a pointer to the block of all values for the variable or
|
|
attribute. The caller is responsible for deleting this block of values
|
|
when no longer needed, as well as the pointer returned by the
|
|
@code{values} method. Note that this is not a good way to read
|
|
selected values of a variable; use the @code{get} member function
|
|
instead, to get single values or selected cross-sections of values.
|
|
|
|
@findex as_ncbyte
|
|
@findex NcTypedComponent::as_ncbyte
|
|
@item ncbyte as_ncbyte( int n ) const
|
|
@findex as_char
|
|
@findex NcTypedComponent::as_char
|
|
@itemx char as_char( int n ) const
|
|
@findex as_short
|
|
@findex NcTypedComponent::as_short
|
|
@itemx short as_short( int n ) const
|
|
@findex as_int
|
|
@findex NcTypedComponent::as_int
|
|
@itemx int as_int( int n ) const
|
|
@findex as_nclong
|
|
@findex NcTypedComponent::as_nclong
|
|
@itemx nclong as_nclong( int n ) const // deprecated
|
|
@findex as_long
|
|
@findex NcTypedComponent::as_long
|
|
@itemx long as_long( int n ) const
|
|
@findex as_float
|
|
@findex NcTypedComponent::as_float
|
|
@itemx float as_float( int n ) const
|
|
@findex as_double
|
|
@findex NcTypedComponent::as_double
|
|
@itemx double as_double( int n ) const
|
|
@findex as_string
|
|
@findex NcTypedComponent::as_string
|
|
@itemx char* as_string( int n ) const
|
|
|
|
Get the n-th value of the attribute or variable. These member functions
|
|
provide conversions from the value type of the variable or attribute to
|
|
the specified type. If the value is out-of-range, the
|
|
fill-value of the appropriate type is returned.
|
|
@end table
|
|
|
|
|
|
@vindex NcVar
|
|
@node Class NcVar, Class NcAtt, Class NcTypedComponent, NetCDF Classes
|
|
@unnumberedsec Class NcVar
|
|
|
|
@code{NcVar} is derived from NcTypedComponent, and represents a netCDF
|
|
variable. A netCDF variable has a name, a type, a shape, zero or more
|
|
attributes, and a block of values associated with it. Because variables
|
|
are only associated with open netCDF files, there are no public
|
|
constructors for this class. Use member functions of @code{NcFile} to
|
|
get variables or add new variables.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
|
|
@findex name
|
|
@findex NcTypedComponent::name
|
|
@item NcToken name( void ) const
|
|
|
|
Returns the name of the variable.
|
|
|
|
@findex type
|
|
@findex NcTypedComponent::type
|
|
@item NcType type( void ) const
|
|
|
|
Returns the type of the variable. The type will be one of
|
|
@code{ncByte}, @code{ncChar}, @code{ncShort}, @code{ncInt},
|
|
@code{ncFloat}, or @code{ncDouble}.
|
|
|
|
@findex num_dims
|
|
@findex NcVar::num_dims
|
|
@item int num_dims( void ) const
|
|
Returns number of dimensions for this variable.
|
|
|
|
@findex get_dim
|
|
@findex NcVar::get_dim
|
|
@item NcDim* get_dim( int n ) const
|
|
Returns a pointer to the n-th dimension (starting at 0). Returns a
|
|
NULL-pointer if an invalid dimension is requested.
|
|
|
|
@findex edges
|
|
@findex NcVar::edges
|
|
@item long* edges( void ) const
|
|
Returns the shape of the variable, in the form of a vector containing
|
|
the sizes of the dimensions of the variable. The caller is responsible
|
|
for deleting the returned edge vector when no longer needed.
|
|
|
|
@findex num_atts
|
|
@findex NcVar::num_atts
|
|
@item int num_atts( void ) const
|
|
Returns the number of attributes attached to the variable.
|
|
|
|
@findex get_att
|
|
@findex NcVar::get_att
|
|
@item NcAtt* get_att( NcToken attname ) const
|
|
@item NcAtt* get_att( int n ) const
|
|
The first member function returns a variable attribute by name. The
|
|
second returns the n-th (starting at 0) attribute of the variable. In
|
|
either case, if no such attribute has been attached to the variable,
|
|
zero is returned. Attributes returned in this way belong to the caller,
|
|
and hence should eventually be deleted by the caller to avoid memory
|
|
leaks.
|
|
|
|
@findex is_valid
|
|
@findex NcTypedComponent::is_valid
|
|
@item NcBool is_valid( void ) const
|
|
|
|
Returns @code{TRUE} if the variable is valid, @code{FALSE} otherwise.
|
|
|
|
@findex num_vals
|
|
@findex NcTypedComponent::num_vals
|
|
@item long num_vals( void ) const
|
|
|
|
Returns the number of values for a variable. This is just 1 for a
|
|
scalar variable, or the product of the dimension sizes for all the
|
|
variable's dimensions.
|
|
|
|
@findex values
|
|
@findex NcTypedComponent::values
|
|
@item NcValues* values( void ) const
|
|
|
|
Returns a pointer to the block of all values for the variable.
|
|
The caller is responsible for deleting this block of values
|
|
when no longer needed.
|
|
Note that this is not a good way to read selected values of
|
|
a variable; use the @code{get} member function instead, to get single
|
|
values or selected cross-sections of values.
|
|
|
|
@findex put
|
|
@findex NcVar::put
|
|
@item NcBool put(const ncbyte* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const char* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const short* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const int* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const long* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const float* vals, long c0, long c1, long c2, long c3, long c4)
|
|
@itemx NcBool put(const double* vals, long c0, long c1, long c2, long c3, long c4)
|
|
|
|
Write scalar or 1 to 5-dimensional arrays by providing enough arguments.
|
|
Arguments are edge lengths, and their number must not exceed variable's
|
|
dimensionality. Start corner is @code{[0,0,..., 0]} by default, but may
|
|
be reset using the @code{set_cur()} member function for this variable.
|
|
@code{FALSE} is returned if type of values does not match type for
|
|
variable. For more than 5 dimensions, use the overloaded n-dimensional
|
|
form of the @code{put} member function.
|
|
|
|
@findex put
|
|
@findex NcVar::put
|
|
@item NcBool put(const ncbyte* vals, const long* counts)
|
|
@itemx NcBool put(const char* vals, const long* counts)
|
|
@itemx NcBool put(const short* vals, const long* counts)
|
|
@itemx NcBool put(const int* vals, const long* counts)
|
|
@itemx NcBool put(const long* vals, const long* counts)
|
|
@itemx NcBool put(const float* vals, const long* counts)
|
|
@itemx NcBool put(const double* vals, const long* counts)
|
|
|
|
Write n-dimensional arrays, starting at @code{[0, 0, ..., 0]} by
|
|
default, may be reset with @code{set_cur()}. @code{FALSE} is returned
|
|
if type of values does not match type for variable.
|
|
|
|
@findex get
|
|
@findex NcVar::get
|
|
@item NcBool get(ncbyte* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(char* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(short* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(int* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(long* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(float* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
@itemx NcBool get(double* vals, long c0, long c1, long c2, long c3, long c4) const
|
|
|
|
Get scalar or 1 to 5 dimensional arrays by providing enough arguments.
|
|
Arguments are edge lengths, and their number must not exceed variable's
|
|
dimensionality. Start corner is @code{[0,0,..., 0]} by default, but may
|
|
be reset using the @code{set_cur()} member function. @code{FALSE} is
|
|
returned if type of values does not match type for variable.
|
|
|
|
@findex get
|
|
@findex NcVar::get
|
|
@item NcBool get(ncbyte* vals, const long* counts) const
|
|
@itemx NcBool get(char* vals, const long* counts) const
|
|
@itemx NcBool get(short* vals, const long* counts) const
|
|
@itemx NcBool get(int* vals, const long* counts) const
|
|
@itemx NcBool get(long* vals, const long* counts) const
|
|
@itemx NcBool get(float* vals, const long* counts) const
|
|
@itemx NcBool get(double* vals, const long* counts) const
|
|
Get n-dimensional arrays, starting at @code{[0, 0, ..., 0]} by default,
|
|
may be reset with @code{set_cur()} member function. @code{FALSE} is
|
|
returned if type of values does not match type for variable.
|
|
|
|
@findex set_cur
|
|
@findex NcVar::set_cur
|
|
@item NcBool set_cur(long c0=-1, long c1=-1, long c2=-1, long c3=-1, long c4=-1)
|
|
@itemx NcBool set_cur(long* cur)
|
|
Resets the starting corner to the values supplied. The first form works
|
|
for a variable of dimensionality from scalar to 5 dimensions. For more
|
|
than five dimensions, use the second form, in which the number of longfs
|
|
supplied must match the rank of the variable. The method returns FALSE if
|
|
any argument is greater than the size of the corresponding dimension.
|
|
|
|
@findex NcVar::add_att
|
|
@findex add_att
|
|
@item NcBool add_att( NcToken, char )
|
|
@item NcBool add_att( NcToken, ncbyte )
|
|
@itemx NcBool add_att( NcToken, short )
|
|
@itemx NcBool add_att( NcToken, int )
|
|
@itemx NcBool add_att( NcToken, long )
|
|
@itemx NcBool add_att( NcToken, float )
|
|
@itemx NcBool add_att( NcToken, double )
|
|
@itemx NcBool add_att( NcToken, const char* )
|
|
@itemx NcBool add_att( NcToken, int, const char* )
|
|
@itemx NcBool add_att( NcToken, int, const ncbyte* )
|
|
@itemx NcBool add_att( NcToken, int, const short* )
|
|
@itemx NcBool add_att( NcToken, int, const int* )
|
|
@itemx NcBool add_att( NcToken, int, const long* )
|
|
@itemx NcBool add_att( NcToken, int, const float* )
|
|
@itemx NcBool add_att( NcToken, int, const double* )
|
|
|
|
Add scalar or vector attribute of any type to a variable, given the
|
|
name, number of values, and the vector of values. These put file in
|
|
define mode, so could be expensive. To avoid the expense of copying
|
|
data, add attributes to variables before writing data.
|
|
|
|
@findex rename
|
|
@findex NcTypedComponent::rename
|
|
@item NcBool rename( NcToken newname )
|
|
|
|
Renames the variable. If variable is renamed to a longer name, this
|
|
puts file in define mode, so could be expensive.
|
|
|
|
@findex as_ncbyte
|
|
@findex NcTypedComponent::as_ncbyte
|
|
@item ncbyte as_ncbyte( int n ) const
|
|
@findex as_char
|
|
@findex NcTypedComponent::as_char
|
|
@itemx char as_char( int n ) const
|
|
@findex as_short
|
|
@findex NcTypedComponent::as_short
|
|
@itemx short as_short( int n ) const
|
|
@findex as_int
|
|
@findex NcTypedComponent::as_int
|
|
@itemx int as_int( int n ) const
|
|
@findex as_nclong
|
|
@findex NcTypedComponent::as_nclong
|
|
@itemx nclong as_nclong( int n ) const // deprecated
|
|
@findex as_long
|
|
@findex NcTypedComponent::as_long
|
|
@itemx long as_long( int n ) const
|
|
@findex as_float
|
|
@findex NcTypedComponent::as_float
|
|
@itemx float as_float( int n ) const
|
|
@findex as_double
|
|
@findex NcTypedComponent::as_double
|
|
@itemx double as_double( int n ) const
|
|
@findex as_string
|
|
@findex NcTypedComponent::as_string
|
|
@itemx char* as_string( int n ) const
|
|
|
|
Get the n-th value of the variable, ignoring its shape. These member
|
|
functions provide conversions from the value type of the variable to the
|
|
specified type. If the requested value is out-of-range, the fill-value of the
|
|
appropriate type is returned.
|
|
|
|
@findex id
|
|
@findex NcVar::id
|
|
@item int id( void ) const
|
|
|
|
Return the variable number. This is not needed in the C++ interface,
|
|
but might be needed in calling a C-function that requires that a variable
|
|
be identified by number instead of name.
|
|
|
|
@findex sync
|
|
@findex NcVar::sync
|
|
@item NcBool sync( void )
|
|
|
|
If the variable may have been renamed, make sure its name is updated.
|
|
|
|
@findex ~NcVar
|
|
@findex NcVar::~NcVar
|
|
@item ~NcVar( void )
|
|
Destructor.
|
|
@end table
|
|
|
|
The following member functions are intended for record variables. They
|
|
will also work for non-record variables, if the first dimension is
|
|
interpreted as the record dimension.
|
|
|
|
@table @code
|
|
@findex rec_size
|
|
@findex NcVar::rec_size
|
|
@item long rec_size( void )
|
|
@item long rec_size( NcDim* )
|
|
|
|
Return the number of values per record or the number of values per
|
|
dimension slice for the specified dimension.
|
|
|
|
@findex get_rec
|
|
@findex NcVar::get_rec
|
|
@item NcValues* get_rec( void )
|
|
@itemx NcValues* get_rec( long n )
|
|
|
|
Get the data for this variable for the current record or for the
|
|
@var{n}th record.
|
|
|
|
@item NcValues* get_rec( NcDim* )
|
|
@itemx NcValues* get_rec( NcDim*, long n )
|
|
|
|
Get the data for this variable for the current dimension slice or for the
|
|
@var{n}th dimension slice.
|
|
|
|
@findex put_rec
|
|
@findex NcVar::put_rec
|
|
@item NcBool put_rec( const ncbyte* vals )
|
|
@itemx NcBool put_rec( const char* vals )
|
|
@itemx NcBool put_rec( const short* vals )
|
|
@itemx NcBool put_rec( const int* vals )
|
|
@itemx NcBool put_rec( const long* vals )
|
|
@itemx NcBool put_rec( const float* vals )
|
|
@itemx NcBool put_rec( const double* vals )
|
|
|
|
Put a record's worth of data for this variable in the current record.
|
|
|
|
@item NcBool put_rec( NcDim*, const ncbyte* vals )
|
|
@itemx NcBool put_rec( NcDim*, const char* vals )
|
|
@itemx NcBool put_rec( NcDim*, const short* vals )
|
|
@itemx NcBool put_rec( NcDim*, const int* vals )
|
|
@itemx NcBool put_rec( NcDim*, const long* vals )
|
|
@itemx NcBool put_rec( NcDim*, const float* vals )
|
|
@itemx NcBool put_rec( NcDim*, const double* vals )
|
|
|
|
Put a dimension slice worth of data for this variable in the current
|
|
dimension slice.
|
|
|
|
@findex put_rec
|
|
@findex NcVar::put_rec
|
|
@item NcBool put_rec( const ncbyte* vals, long rec )
|
|
@itemx NcBool put_rec( const char* vals, long rec )
|
|
@itemx NcBool put_rec( const short* vals, long rec )
|
|
@itemx NcBool put_rec( const int* vals, long rec )
|
|
@itemx NcBool put_rec( const long* vals, long rec )
|
|
@itemx NcBool put_rec( const float* vals, long rec )
|
|
@itemx NcBool put_rec( const double* vals, long rec )
|
|
|
|
Put a record's worth of data for this variable in the specified record.
|
|
|
|
@item NcBool put_rec( NcDim*, const ncbyte* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const char* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const short* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const int* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const long* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const float* vals, long slice )
|
|
@itemx NcBool put_rec( NcDim*, const double* vals, long slice )
|
|
|
|
Put a dimension slice worth of data for this variable in the specified
|
|
dimension slice.
|
|
|
|
@findex get_index
|
|
@findex NcVar::get_index
|
|
@item long get_index( const ncbyte* vals )
|
|
@itemx long get_index( const char* vals )
|
|
@itemx long get_index( const short* vals )
|
|
@itemx long get_index( const int* vals )
|
|
@itemx long get_index( const long* vals )
|
|
@itemx long get_index( const float* vals )
|
|
@itemx long get_index( const double* vals )
|
|
|
|
Get first record index for this variable corresponding to the specified
|
|
key value(s).
|
|
|
|
@item long get_index( NcDim*, const ncbyte* vals )
|
|
@itemx long get_index( NcDim*, const char* vals )
|
|
@itemx long get_index( NcDim*, const short* vals )
|
|
@itemx long get_index( NcDim*, const int* vals )
|
|
@itemx long get_index( NcDim*, const long* vals )
|
|
@itemx long get_index( NcDim*, const float* vals )
|
|
@itemx long get_index( NcDim*, const double* vals )
|
|
|
|
Get first index of specified dimension for this variable corresponding
|
|
to the specified key value(s).
|
|
|
|
@findex set_rec
|
|
@findex NcVar::set_rec
|
|
@item void set_rec ( long rec )
|
|
|
|
Set the current record for this variable.
|
|
|
|
@item void set_rec ( NcDim*, long rec )
|
|
|
|
Set the current dimension slice for the specified dimension for this variable.
|
|
|
|
@end table
|
|
|
|
@vindex NcAtt
|
|
@node Class NcAtt, , Class NcVar, NetCDF Classes
|
|
@unnumberedsec Class NcAtt
|
|
|
|
@code{NcAtt} is derived from @code{NcTypedComponent}, and represents a netCDF
|
|
attribute. A netCDF attribute has a name and a type, and may be either
|
|
a scalar attribute or a vector attribute. Scalar attributes have one
|
|
value and vector attributes have multiple values. In addition, each
|
|
attribute is attached to a specific netCDF variable or is global to an
|
|
entire netCDF file. Because attributes are only associated with open
|
|
netCDF files, there are no public constructors for this class. Use
|
|
member functions of @code{NcFile} and @code{NcVar} to get netCDF
|
|
attributes or add new attributes. Most of the useful member functions
|
|
for @code{NcAtt} are
|
|
inherited from class @code{NcTypedComponent}.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
|
|
@findex name
|
|
@findex NcTypedComponent::name
|
|
@item NcToken name( void ) const
|
|
|
|
Returns the name of the attribute.
|
|
|
|
@findex type
|
|
@findex NcTypedComponent::type
|
|
@item NcType type( void ) const
|
|
|
|
Returns the type of the attribute. The type will be one of
|
|
@code{ncByte}, @code{ncChar}, @code{ncShort}, @code{ncInt},
|
|
@code{ncFloat}, or @code{ncDouble}.
|
|
|
|
@findex is_valid
|
|
@findex NcTypedComponent::is_valid
|
|
@item NcBool is_valid( void ) const
|
|
|
|
Returns @code{TRUE} if the attribute is valid, @code{FALSE} otherwise.
|
|
|
|
@findex num_vals
|
|
@findex NcTypedComponent::num_vals
|
|
@item long num_vals( void ) const
|
|
|
|
Returns the number of values for an attribute. This is just 1 for a
|
|
scalar attribute, the number of values for a vector-valued attribute,
|
|
and the number of characters for a string-valued attribute.
|
|
|
|
@findex rename
|
|
@findex NcTypedComponent::rename
|
|
@item NcBool rename( NcToken newname )
|
|
|
|
Renames the attribute.
|
|
|
|
@findex values
|
|
@findex NcTypedComponent::values
|
|
@item NcValues* values( void ) const
|
|
|
|
Returns a pointer to the block of all values for the
|
|
attribute. The caller is responsible for deleting this block of values
|
|
when no longer needed.
|
|
|
|
@findex as_ncbyte
|
|
@findex NcTypedComponent::as_ncbyte
|
|
@item ncbyte as_ncbyte( int n ) const
|
|
@findex as_char
|
|
@findex NcTypedComponent::as_char
|
|
@itemx char as_char( int n ) const
|
|
@findex as_short
|
|
@findex NcTypedComponent::as_short
|
|
@itemx short as_short( int n ) const
|
|
|
|
@findex as_int
|
|
@findex NcTypedComponent::as_int
|
|
@itemx int as_int( int n ) const
|
|
|
|
@findex as_nclong
|
|
@findex NcTypedComponent::as_nclong
|
|
@itemx nclong as_nclong( int n ) const // deprecated
|
|
|
|
@findex as_long
|
|
@findex NcTypedComponent::as_long
|
|
@itemx long as_long( int n ) const
|
|
|
|
@findex as_float
|
|
@findex NcTypedComponent::as_float
|
|
@itemx float as_float( int n ) const
|
|
@findex as_double
|
|
@findex NcTypedComponent::as_double
|
|
@itemx double as_double( int n ) const
|
|
@findex as_string
|
|
@findex NcTypedComponent::as_string
|
|
@itemx char* as_string( int n ) const
|
|
|
|
Get the n-th value of the attribute. These member functions provide
|
|
conversions from the value type of the attribute to the specified type.
|
|
If the value is out-of-range, the fill-value of the appropriate type is
|
|
returned.
|
|
|
|
@findex remove
|
|
@findex NcAtt::remove
|
|
@item NcBool remove( void )
|
|
Deletes the attribute from the file and detaches it from the variable.
|
|
Does not call the destructor. Subsequent calls to @code{is_valid()} will
|
|
return @code{FALSE}.
|
|
|
|
@findex ~NcAtt
|
|
@findex NcAtt::~NcAtt
|
|
@item ~NcAtt( void )
|
|
Destructor.
|
|
@end table
|
|
|
|
@node Auxiliary Classes, Combined Index, NetCDF Classes, Top
|
|
@unnumbered Auxiliary Classes
|
|
|
|
Auxiliary classes include the abstract base class @code{NcValues}, its
|
|
type-specific derived subclasses, and the error-handling class
|
|
@code{NcError}.
|
|
|
|
@menu
|
|
* Class NcValues::
|
|
* Class NcError::
|
|
@end menu
|
|
|
|
@vindex NcValues
|
|
@node Class NcValues, Class NcError, Auxiliary Classes, Auxiliary Classes
|
|
@unnumberedsec Class NcValues
|
|
|
|
@vindex NcValues_ncbyte
|
|
@vindex NcValues_char
|
|
@vindex NcValues_short
|
|
@vindex NcValues_int
|
|
@vindex NcValues_nclong
|
|
@vindex NcValues_long
|
|
@vindex NcValues_float
|
|
@vindex NcValues_double
|
|
Class @code{NcValues} is an abstract base class for a block of typed
|
|
values. The derived classes are @code{NcValues_ncbyte},
|
|
@code{NcValues_char}, @code{NcValues_short}, @code{NcValues_int},
|
|
@code{NcValues_nclong} (deprecated), and @code{NcValues_long},
|
|
@code{NcValues_float}, @code{NcValues_double}.
|
|
These classes are used as the return type of the
|
|
@code{NcTypedComponent::values()} member function, for typed-value
|
|
arrays associated with variables and attributes.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
|
|
@findex NcValues
|
|
@findex NcValues::NcValues
|
|
@item NcValues( void )
|
|
Default constructor.
|
|
|
|
@findex NcValues
|
|
@findex NcValues::NcValues
|
|
@item NcValues(NcType, long)
|
|
Constructor for a value block of the specified type and length.
|
|
|
|
@findex ~NcValues
|
|
@findex NcValues::~NcValues
|
|
@item ~NcValues( void )
|
|
Destructor.
|
|
|
|
@findex num
|
|
@findex NcValues::num
|
|
@item long num( void )
|
|
Returns the number of values in the value block.
|
|
|
|
@findex print
|
|
@findex NcValues::print
|
|
@item ostream& print(ostream&) const
|
|
Used to print the comma-delimited sequence of values of the value block.
|
|
|
|
@findex base
|
|
@findex NcValues::base
|
|
@item void* base( void ) const
|
|
Returns a bland pointer to the beginning of the value block.
|
|
|
|
@findex bytes_for_one
|
|
@findex NcValues::bytes_for_one
|
|
@item int bytes_for_one( void ) const
|
|
Returns the number of bytes required for one value.
|
|
|
|
@findex as_ncbyte
|
|
@findex NcValues::as_ncbyte
|
|
@item ncbyte as_ncbyte( int n ) const
|
|
@findex as_char
|
|
@findex NcValues::as_char
|
|
@itemx char as_char( int n ) const
|
|
@findex as_short
|
|
@findex NcValues::as_short
|
|
@itemx short as_short( int n ) const
|
|
|
|
@findex as_int
|
|
@findex NcValues::as_int
|
|
@itemx int as_int( int n ) const
|
|
|
|
@findex as_nclong
|
|
@findex NcValues::as_nclong
|
|
@itemx nclong as_nclong( int n ) const // deprecated
|
|
|
|
@findex as_long
|
|
@findex NcValues::as_long
|
|
@itemx long as_long( int n ) const
|
|
|
|
@findex as_float
|
|
@findex NcValues::as_float
|
|
@itemx float as_float( int n ) const
|
|
@findex as_double
|
|
@findex NcValues::as_double
|
|
@itemx double as_double( int n ) const
|
|
@findex as_string
|
|
@findex NcValues::as_string
|
|
@itemx char* as_string( int n ) const
|
|
Provide conversions for the nth value from the value type to a desired
|
|
basic type. If the value is out of range, the default "fill-value" for
|
|
the appropriate type is returned.
|
|
@end table
|
|
|
|
@vindex NcError
|
|
@node Class NcError, , Class NcValues, Auxiliary Classes
|
|
@unnumberedsec Class NcError
|
|
|
|
This class provides control for netCDF error handling. Declaring an
|
|
@code{NcError} object temporarily changes the error-handling behavior
|
|
for all netCDF classes until the @code{NcError} object is destroyed
|
|
(typically by going out of scope), at which time the previous
|
|
error-handling behavior is restored.
|
|
|
|
@unnumberedsubsec Public Member Functions
|
|
|
|
@table @code
|
|
@findex NcError
|
|
@item NcError( Behavior b = verbose_fatal )
|
|
The constructor saves the previous error state for restoration when the
|
|
destructor is invoked, and sets a new specified state. Valid error
|
|
states are @code{NcError::silent_nonfatal},
|
|
@code{NcError::verbose_nonfatal}, @code{NcError::silent_fatal}, or
|
|
@code{NcError::verbose_fatal}, to control whether error messages are
|
|
output from the underlying library and whether such messages are fatal
|
|
or nonfatal.
|
|
|
|
@findex ~NcError
|
|
@findex NcError::~NcError
|
|
@item ~NcError( void )
|
|
Destructor, restores previous error state.
|
|
|
|
@findex get_err
|
|
@findex NcError::get_err
|
|
@item int get_err( void )
|
|
Returns most recent error, as enumerated in @file{netcdf.h}.
|
|
@end table
|
|
|
|
@node Combined Index, , Auxiliary Classes, Top
|
|
@unnumbered Index
|
|
|
|
@printindex cp
|
|
|
|
@bye
|
|
End:
|