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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* This program shows the concept of "mounting files".
* Program creates one file with group G in it, and another
* file with dataset D. Then second file is mounted in the first one
* under the "mounting point" G. Dataset D is accessed in the first file
* under name /G/D and data is printed out.
*/
#include "hdf5.h"
#define FILE1 "mount1.h5"
#define FILE2 "mount2.h5"
#define RANK 2
#define NX 4
#define NY 5
int
main(void)
{
hid_t fid1, fid2, gid; /* Files and group identifiers */
hid_t did, tid, sid; /* Dataset and datatype identifiers */
herr_t status;
hsize_t dims[] = {NX, NY}; /* Dataset dimensions */
int i, j;
int bm[NX][NY], bm_out[NX][NY]; /* Data buffers */
/*
* Initialization of buffer matrix "bm"
*/
for (i = 0; i < NX; i++)
for (j = 0; j < NY; j++)
bm[i][j] = i + j;
/*
* Create first file and a group in it.
*/
fid1 = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
gid = H5Gcreate2(fid1, "/G", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
/*
* Close group and file
*/
H5Gclose(gid);
H5Fclose(fid1);
/*
* Create second file and dataset "D" in it.
*/
fid2 = H5Fcreate(FILE2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
dims[0] = NX;
dims[1] = NY;
sid = H5Screate_simple(RANK, dims, NULL);
did = H5Dcreate2(fid2, "D", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
/*
* Write data to the dataset.
*/
status = H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, bm);
/*
* Close all identifiers.
*/
H5Sclose(sid);
H5Dclose(did);
H5Fclose(fid2);
/*
* Reopen both files
*/
fid1 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
fid2 = H5Fopen(FILE2, H5F_ACC_RDONLY, H5P_DEFAULT);
/*
* Mount second file under G in the first file.
*/
H5Fmount(fid1, "/G", fid2, H5P_DEFAULT);
/*
* Access dataset D in the first file under /G/D name.
*/
did = H5Dopen2(fid1, "/G/D", H5P_DEFAULT);
tid = H5Dget_type(did);
status = H5Dread(did, tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, bm_out);
/*
* Print out the data.
*/
for (i = 0; i < NX; i++) {
for (j = 0; j < NY; j++)
printf(" %d", bm_out[i][j]);
printf("\n");
}
/*
* Close all identifers
*/
H5Tclose(tid);
H5Dclose(did);
/*
* Unmounting second file
*/
H5Funmount(fid1, "/G");
/*
* Close both files
*/
H5Fclose(fid1);
H5Fclose(fid2);
return 0;
}
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