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-rw-r--r--examples/h5_mount.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/examples/h5_mount.c b/examples/h5_mount.c
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+++ b/examples/h5_mount.c
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+/*
+ * 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 = H5Gcreate(fid1, "/G", 0);
+
+ /*
+ * 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 = H5Dcreate(fid2, "D", H5T_NATIVE_INT, sid, 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 = H5Dopen(fid1,"/G/D");
+ 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;
+}
+
+
+