mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-09 08:11:38 +08:00
49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
|
/** \file
|
||
|
|
Documentation of error handling.
|
||
|
|
|
||
|
|
\page Programming Notes
|
||
|
|
|
||
|
|
\section error_handling Error Handling
|
||
|
|
|
||
|
|
Each netCDF function returns an integer status value. Non-zero values
|
||
|
|
indicate error.
|
||
|
|
|
||
|
|
The nc_strerror function is available to convert a returned integer
|
||
|
|
error status into an error message string.
|
||
|
|
|
||
|
|
If the returned status value indicates an error, you may handle it in
|
||
|
|
any way desired, from printing an associated error message and exiting
|
||
|
|
to ignoring the error indication and proceeding (not
|
||
|
|
recommended!). For simplicity, the examples in this guide check the
|
||
|
|
error status and call a separate function, handle_err(), to handle any
|
||
|
|
errors. One possible definition of handle_err() can be found within
|
||
|
|
the documentation of nc_strerror().
|
||
|
|
|
||
|
|
Occasionally, low-level I/O errors may occur in a layer below the
|
||
|
|
netCDF library. For example, if a write operation causes you to exceed
|
||
|
|
disk quotas or to attempt to write to a device that is no longer
|
||
|
|
available, you may get an error from a layer below the netCDF library,
|
||
|
|
but the resulting write error will still be reflected in the returned
|
||
|
|
status value.
|
||
|
|
|
||
|
|
\section ignored_if_null Ignored if NULL
|
||
|
|
|
||
|
|
Many of the argurments of netCDF functions are pointers. For example,
|
||
|
|
the nc_inq() functions takes four pointers:
|
||
|
|
|
||
|
|
\code
|
||
|
|
int nc_inq(int ncid, int *ndimsp, int *nvarsp, int *nattsp, int *unlimdimidp);
|
||
|
|
\endcode
|
||
|
|
|
||
|
|
A NULL may be passed for any of these pointers, and it will be
|
||
|
|
ignored. For example, interested in the number of dimensions only, the
|
||
|
|
following code will work:
|
||
|
|
|
||
|
|
\code
|
||
|
|
int ndims;
|
||
|
|
...
|
||
|
|
if (nc_inq(ncid, &ndims, NULL, NULL, NULL))
|
||
|
|
return SOME_ERROR;
|
||
|
|
\endcode
|
||
|
|
|
||
|
|
*/
|