diff options
| -rw-r--r-- | examples/h5_reference.c | 72 |
1 files changed, 30 insertions, 42 deletions
diff --git a/examples/h5_reference.c b/examples/h5_reference.c index a345166..b10495d 100644 --- a/examples/h5_reference.c +++ b/examples/h5_reference.c @@ -1,12 +1,12 @@ /* - * This program illustrates how references to the objects can be used. - * Program creates two datasets in the file. It also creates the third - * dataset, and references to the first two datasets are stored in it. + * This program illustrates how references to objects can be used. + * Program creates a dataset and a group in a file. It also creates + * second dataset, and references to the first dataset and the group + * are stored in it. * Program reopens the file and reads dataset with the references. - * References are used to open first two datasets and read datatspace - * and datatype information about them. - * - */ + * References are used to open the objects. Information about the + * objects is displayed. + */ #include <stdlib.h> #include<hdf5.h> @@ -15,9 +15,9 @@ int main(void) { - hid_t fid; /* File, datasets, datatypes and */ - hid_t did_a, sid_a; /* dataspaces identifiers for three */ - hid_t did_b, tid_b, sid_b; /* datasets. */ + hid_t fid; /* File, group, datasets, datatypes */ + hid_t gid_a; /* and dataspaces identifiers */ + hid_t did_b, sid_b, tid_b; hid_t did_r, tid_r, sid_r; herr_t status; @@ -26,10 +26,7 @@ main(void) { hsize_t dim_r[1]; - hsize_t dim_a[1]; hsize_t dim_b[2]; - - herr_t ret; /* return values */ /* * Create a file using default properties. @@ -37,11 +34,9 @@ main(void) { fid = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); /* - * Create dataset "A" in the file. + * Create group "A" in the file. */ - dim_a[0] = 5; - sid_a = H5Screate_simple(1, dim_a, NULL); - did_a = H5Dcreate(fid, "A", H5T_NATIVE_INT, sid_a, H5P_DEFAULT); + gid_a = H5Gcreate(fid, "A", -1); /* * Create dataset "B" in the file. @@ -52,7 +47,7 @@ main(void) { did_b = H5Dcreate(fid, "B", H5T_NATIVE_FLOAT, sid_b, H5P_DEFAULT); /* - * Create dataset "R" to store references to the datasets "A" and "B". + * Create dataset "R" to store references to the objects "A" and "B". */ dim_r[0] = 2; sid_r = H5Screate_simple(1, dim_r, NULL); @@ -62,11 +57,11 @@ main(void) { /* * Allocate write and read buffers. */ - wbuf = malloc(sizeof(hobj_ref_t)*2); - rbuf = malloc(sizeof(hobj_ref_t)*2); + wbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t)*2); + rbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t)*2); /* - * Create references to the datasets "A" and "B" + * Create references to the group "A" and dataset "B" * and store them in the wbuf. */ H5Rcreate(&wbuf[0], fid, "A", H5R_OBJECT, -1); @@ -81,8 +76,7 @@ main(void) { /* * Close all objects. */ - H5Sclose(sid_a); - H5Dclose(did_a); + H5Gclose(gid_a); H5Sclose(sid_b); H5Dclose(did_b); @@ -101,44 +95,38 @@ main(void) { /* * Open and read dataset "R". */ - did_r = H5Dopen(fid, "R"); + did_r = H5Dopen(fid, "R"); status = H5Dread(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf); /* - * Open dataset A using reference to it. + * Find the type of referenced objects. */ - did_a = H5Rdereference(did_r, H5R_OBJECT, &rbuf[0]); - - /* - * Get rank of the dataset "A" - */ - - printf("\n"); - sid_a = H5Dget_space(did_a); - ret = H5Sget_simple_extent_ndims(sid_a); - - if(ret == 1) printf("Rank of A is %d.\n", ret); - printf("\n"); + status = H5Rget_object_type(did_r, &rbuf[0]); + if ( status == H5G_GROUP ) + printf("First dereferenced object is a group. \n"); + status = H5Rget_object_type(did_r, &rbuf[1]); + if ( status == H5G_DATASET ) + printf("Second dereferenced object is a dataset. \n"); /* * Get datatype of the dataset "B" */ did_b = H5Rdereference(did_r, H5R_OBJECT, &rbuf[1]); tid_b = H5Dget_type(did_b); if(H5Tequal(tid_b, H5T_NATIVE_FLOAT)) - printf("Datatype of B is H5T_NATIVE_FLOAT.\n"); + printf("Datatype of the dataset is H5T_NATIVE_FLOAT.\n"); printf("\n"); /* - * Close all objects. + * Close all objects and free memory buffers. */ - H5Dclose(did_a); - H5Sclose(sid_a); + H5Dclose(did_r); H5Dclose(did_b); H5Tclose(tid_b); H5Fclose(fid); - + free(rbuf); + free(wbuf); return 0; } |