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https://github.com/HDFGroup/hdf5.git
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[svn-r1379]
Two new examples h5_mount.c and h5_reference.c were added. h5_select.c was modified to use fill values, and h5_group.c was modified to show how H5Giterate can be used to get information about the objects in a group. Necessary changes were done to the Makefile.in. Tested on Solaris 2.6 (baldric)
This commit is contained in:
Elena Pourmal
parent
8c11a3a87c
commit
40abc59350
@ -1,8 +1,9 @@
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/*
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* This example creates a group in the file and dataset in the group.
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* Hard link to the group object is created and the dataset is accessed
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* under different names.
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* Iterator function is used to find the object names in the root group.
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* This program creates a group in the file and two datasets in the group.
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* Hard link to the group object is created and one of the datasets is accessed
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* under new name.
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* Iterator functions are used to find information about the objects
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* in the root group and in the created group.
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*/
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@ -12,9 +13,10 @@
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#define FILE "group.h5"
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#define RANK 2
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herr_t file_info(hid_t loc_id, const char *name, void *opdata);
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/* Operator function */
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herr_t group_info(hid_t loc_id, const char *name, void *opdata);
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/* Operator function */
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int
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main(void)
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{
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@ -28,7 +30,7 @@ main(void)
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hsize_t dims[2];
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hsize_t cdims[2];
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int idx;
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int idx_f, idx_g;
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/*
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* Create a file.
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@ -56,9 +58,23 @@ main(void)
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H5Pset_deflate( plist, 6);
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dataset = H5Dcreate(file, "/Data/Compressed_Data", H5T_NATIVE_INT,
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dataspace, plist);
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/*
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* Close the dataset and the file.
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* Close the first dataset .
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*/
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H5Sclose(dataspace);
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H5Dclose(dataset);
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/*
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* Create the second dataset.
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*/
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dims[0] = 500;
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dims[1] = 20;
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dataspace = H5Screate_simple(RANK, dims, NULL);
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dataset = H5Dcreate(file, "/Data/Float_Data", H5T_NATIVE_FLOAT,
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dataspace, H5P_DEFAULT);
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/*
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*Close the second dataset and file.
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*/
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H5Sclose(dataspace);
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H5Dclose(dataset);
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@ -74,7 +90,7 @@ main(void)
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* Access "Compressed_Data" dataset in the group.
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*/
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dataset = H5Dopen(grp, "Compressed_Data");
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if( dataset < 0) printf(" Dataset is not found. \n");
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if( dataset < 0) printf(" Dataset 'Compressed-Data' is not found. \n");
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printf("\"/Data/Compressed_Data\" dataset is open \n");
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/*
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@ -100,11 +116,11 @@ main(void)
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*/
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status = H5Dclose(dataset);
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/*
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* Use iterator to see the names of the objects in the file
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* root directory.
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* Use iterator to see the names of the objects in the root group.
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*/
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idx = H5Giterate(file, "/", NULL, file_info, NULL);
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idx_f = H5Giterate(file, "/", NULL, file_info, NULL);
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/*
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* Unlink name "Data" and use iterator to see the names
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@ -115,8 +131,13 @@ main(void)
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else
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printf("\"Data\" is unlinked \n");
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idx = H5Giterate(file, "/", NULL, file_info, NULL);
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idx_f = H5Giterate(file, "/", NULL, file_info, NULL);
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/*
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* Use iterator to see the names of the objects in the group
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* /Data_new.
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*/
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idx_g = H5Giterate(grp, "/Data_new", NULL, group_info, NULL);
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/*
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* Close the file.
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@ -126,25 +147,96 @@ main(void)
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return 0;
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}
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/*
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* Operator function.
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*/
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herr_t
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file_info(hid_t loc_id, const char *name, void *opdata)
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herr_t file_info(hid_t loc_id, const char *name, void *opdata)
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{
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hid_t grp;
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/*
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* Open the group using its name.
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*/
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grp = H5Gopen(loc_id, name);
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/*
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* Display group name.
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* Display group name. The name is passed to the function by
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* the Library. Some magic :-)
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*/
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printf("\n");
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printf("Name : ");
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puts(name);
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H5Gclose(grp);
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return 0;
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}
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/*
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* Operator function.
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*/
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herr_t group_info(hid_t loc_id, const char *name, void *opdata)
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{
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hid_t did; /* dataset identifier */
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hid_t tid; /* datatype identifier */
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H5T_class_t class;
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hid_t pid; /* data_property identifier */
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hsize_t chunk_dims_out[2];
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int rank_chunk;
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/*
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* Open the datasets using their names.
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*/
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did = H5Dopen(loc_id, name);
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/*
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* Display dataset name.
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*/
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printf("\n");
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printf("Name : ");
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puts(name);
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/*
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* Display dataset information.
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*/
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tid = H5Dget_type(did); /* get datatype*/
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pid = H5Dget_create_plist(did); /* get creation property list */
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/*
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* Check if dataset is chunked.
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*/
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if(H5D_CHUNKED == H5Pget_layout(pid)){
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/*
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* get chunking information: rank and dimensions.
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*/
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rank_chunk = H5Pget_chunk(pid, 2, chunk_dims_out);
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printf("chunk rank %d, dimensions %lu x %lu\n", rank_chunk,
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(unsigned long)(chunk_dims_out[0]),
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(unsigned long)(chunk_dims_out[1]));
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}
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else{
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class = H5Tget_class(tid);
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if(class < 0){
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puts(" Invalid datatype.\n");
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}
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else {
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if(class == H5T_INTEGER)
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puts(" Datatype is 'H5T_NATIVE_INTEGER'.\n");
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if(class == H5T_FLOAT)
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puts(" Datatype is 'H5T_NATIVE_FLOAT'.\n");
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if(class == H5T_STRING)
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puts(" Datatype is 'H5T_NATIVE_STRING'.\n");
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if(class == H5T_BITFIELD)
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puts(" Datatype is 'H5T_NATIVE_BITFIELD'.\n");
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if(class == H5T_OPAQUE)
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puts(" Datatype is 'H5T_NATIVE_OPAQUE'.\n");
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if(class == H5T_COMPOUND)
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puts(" Datatype is 'H5T_NATIVE_COMPOUND'.\n");
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}
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}
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H5Dclose(did);
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H5Pclose(pid);
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H5Tclose(tid);
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return 0;
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}
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119
examples/h5_mount.c
Normal file
119
examples/h5_mount.c
Normal file
@ -0,0 +1,119 @@
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/*
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* This program shows the concept of "mounting files".
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* Program creates one file with group G in it, and another
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* file with dataset D. Then second file is mounted in the first one
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* under the "mounting point" G. Dataset D is accessed in the first file
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* under name /G/D and data is printed out.
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*/
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#include<hdf5.h>
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#define FILE1 "mount1.h5"
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#define FILE2 "mount2.h5"
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#define RANK 2
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#define NX 4
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#define NY 5
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int main(void)
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{
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hid_t fid1, fid2, gid; /* Files and group identifiers */
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hid_t did, tid, sid; /* Dataset and datatype identifiers */
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herr_t status;
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hsize_t dims[] = {NX,NY}; /* Dataset dimensions */
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int i, j;
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int bm[NX][NY], bm_out[NX][NY]; /* Data buffers */
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/*
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* Initialization of buffer matrix "bm"
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*/
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for(i =0; i<NX; i++) {
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for(j = 0; j<NY; j++)
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bm[i][j] = i + j;
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}
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/*
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* Create first file and a group in it.
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*/
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fid1 = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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gid = H5Gcreate(fid1, "/G", 0);
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/*
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* Close group and file
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*/
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H5Gclose(gid);
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H5Fclose(fid1);
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/*
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* Create second file and dataset "D" in it.
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*/
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fid2 = H5Fcreate(FILE2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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dims[0] = NX;
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dims[1] = NY;
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sid = H5Screate_simple(RANK, dims, NULL);
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did = H5Dcreate(fid2, "D", H5T_NATIVE_INT, sid, H5P_DEFAULT);
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/*
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* Write data to the dataset.
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*/
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status = H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, bm);
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/*
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* Close all identifiers.
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*/
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H5Sclose(sid);
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H5Dclose(did);
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H5Fclose(fid2);
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/*
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* Reopen both files
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*/
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fid1 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
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fid2 = H5Fopen(FILE2, H5F_ACC_RDONLY, H5P_DEFAULT);
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/*
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* Mount second file under G in the first file.
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*/
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H5Fmount(fid1, "/G", fid2, H5P_DEFAULT);
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/*
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* Access dataset D in the first file under /G/D name.
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*/
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did = H5Dopen(fid1,"/G/D");
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tid = H5Dget_type(did);
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status = H5Dread(did, tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, bm_out);
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/*
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* Print out the data.
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*/
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for(i=0; i<NX; i++){
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for(j=0; j<NY; j++)
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printf(" %d", bm_out[i][j]);
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printf("\n");
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}
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/*
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* Close all identifers
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*/
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H5Tclose(tid);
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H5Dclose(did);
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/*
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* Unmounting second file
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*/
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H5Funmount(fid1, "/G");
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/*
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* Close both files
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*/
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H5Fclose(fid1);
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H5Fclose(fid2);
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return 0;
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}
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@ -33,7 +33,8 @@
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#define NPOINTS 4 /* Number of points that will be selected
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and overwritten */
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int main (void)
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int
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main (void)
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{
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hid_t file, dataset; /* File and dataset identifiers */
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