diff options
Diffstat (limited to 'examples/h5_reference.c')
| -rw-r--r-- | examples/h5_reference.c | 239 |
1 files changed, 119 insertions, 120 deletions
diff --git a/examples/h5_reference.c b/examples/h5_reference.c index 32a5f59..457956b 100644 --- a/examples/h5_reference.c +++ b/examples/h5_reference.c @@ -11,15 +11,15 @@ * help@hdfgroup.org. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ - /* - * 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 the objects. Information about the - * objects is displayed. - */ +/* + * 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 the objects. Information about the + * objects is displayed. + */ #include <stdlib.h> @@ -28,120 +28,119 @@ #define H5FILE_NAME "refere.h5" int -main(void) { - 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; - H5O_type_t obj_type; - herr_t status; - - hobj_ref_t *wbuf; /* buffer to write to disk */ - hobj_ref_t *rbuf; /* buffer to read from disk */ - - - hsize_t dim_r[1]; - hsize_t dim_b[2]; - - /* - * Create a file using default properties. - */ - fid = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); - - /* - * Create group "A" in the file. - */ - gid_a = H5Gcreate2(fid, "A", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); - - /* - * Create dataset "B" in the file. - */ - dim_b[0] = 2; - dim_b[1] = 6; - sid_b = H5Screate_simple(2, dim_b, NULL); - did_b = H5Dcreate2(fid, "B", H5T_NATIVE_FLOAT, sid_b, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); - - /* - * Create dataset "R" to store references to the objects "A" and "B". - */ - dim_r[0] = 2; - sid_r = H5Screate_simple(1, dim_r, NULL); - tid_r = H5Tcopy(H5T_STD_REF_OBJ); - did_r = H5Dcreate2(fid, "R", tid_r, sid_r, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); - - /* - * Allocate write and read buffers. - */ - wbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2); - rbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2); - - /* - * Create references to the group "A" and dataset "B" - * and store them in the wbuf. - */ - H5Rcreate(&wbuf[0], fid, "A", H5R_OBJECT, (hid_t)-1); - H5Rcreate(&wbuf[1], fid, "B", H5R_OBJECT, (hid_t)-1); - - /* - * Write dataset R using default transfer properties. - */ - status = H5Dwrite(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, wbuf); - - /* - * Close all objects. - */ - H5Gclose(gid_a); - - H5Sclose(sid_b); - H5Dclose(did_b); - - H5Tclose(tid_r); - H5Sclose(sid_r); - H5Dclose(did_r); - - H5Fclose(fid); - - /* - * Reopen the file. - */ - fid = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT); - - /* - * Open and read dataset "R". - */ - did_r = H5Dopen2(fid, "R", H5P_DEFAULT); - status = H5Dread(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf); - - /* - * Find the type of referenced objects. - */ +main(void) +{ + 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; + H5O_type_t obj_type; + herr_t status; + + hobj_ref_t *wbuf; /* buffer to write to disk */ + hobj_ref_t *rbuf; /* buffer to read from disk */ + + hsize_t dim_r[1]; + hsize_t dim_b[2]; + + /* + * Create a file using default properties. + */ + fid = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + + /* + * Create group "A" in the file. + */ + gid_a = H5Gcreate2(fid, "A", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); + + /* + * Create dataset "B" in the file. + */ + dim_b[0] = 2; + dim_b[1] = 6; + sid_b = H5Screate_simple(2, dim_b, NULL); + did_b = H5Dcreate2(fid, "B", H5T_NATIVE_FLOAT, sid_b, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); + + /* + * Create dataset "R" to store references to the objects "A" and "B". + */ + dim_r[0] = 2; + sid_r = H5Screate_simple(1, dim_r, NULL); + tid_r = H5Tcopy(H5T_STD_REF_OBJ); + did_r = H5Dcreate2(fid, "R", tid_r, sid_r, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); + + /* + * Allocate write and read buffers. + */ + wbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2); + rbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2); + + /* + * Create references to the group "A" and dataset "B" + * and store them in the wbuf. + */ + H5Rcreate(&wbuf[0], fid, "A", H5R_OBJECT, (hid_t)-1); + H5Rcreate(&wbuf[1], fid, "B", H5R_OBJECT, (hid_t)-1); + + /* + * Write dataset R using default transfer properties. + */ + status = H5Dwrite(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, wbuf); + + /* + * Close all objects. + */ + H5Gclose(gid_a); + + H5Sclose(sid_b); + H5Dclose(did_b); + + H5Tclose(tid_r); + H5Sclose(sid_r); + H5Dclose(did_r); + + H5Fclose(fid); + + /* + * Reopen the file. + */ + fid = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT); + + /* + * Open and read dataset "R". + */ + did_r = H5Dopen2(fid, "R", H5P_DEFAULT); + status = H5Dread(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf); + + /* + * Find the type of referenced objects. + */ status = H5Rget_obj_type2(did_r, H5R_OBJECT, &rbuf[0], &obj_type); - if(obj_type == H5O_TYPE_GROUP) + if (obj_type == H5O_TYPE_GROUP) printf("First dereferenced object is a group. \n"); status = H5Rget_obj_type2(did_r, H5R_OBJECT, &rbuf[1], &obj_type); - if(obj_type == H5O_TYPE_DATASET) + if (obj_type == H5O_TYPE_DATASET) printf("Second dereferenced object is a dataset. \n"); - /* - * Get datatype of the dataset "B" - */ - did_b = H5Rdereference2(did_r, H5P_DEFAULT, H5R_OBJECT, &rbuf[1]); - tid_b = H5Dget_type(did_b); - if(H5Tequal(tid_b, H5T_NATIVE_FLOAT)) - printf("Datatype of the dataset is H5T_NATIVE_FLOAT.\n"); - printf("\n"); - - /* - * Close all objects and free memory buffers. - */ - H5Dclose(did_r); - H5Dclose(did_b); - H5Tclose(tid_b); - H5Fclose(fid); - free(rbuf); - free(wbuf); - - return 0; - } - + /* + * Get datatype of the dataset "B" + */ + did_b = H5Rdereference2(did_r, H5P_DEFAULT, H5R_OBJECT, &rbuf[1]); + tid_b = H5Dget_type(did_b); + if (H5Tequal(tid_b, H5T_NATIVE_FLOAT)) + printf("Datatype of the dataset is H5T_NATIVE_FLOAT.\n"); + printf("\n"); + + /* + * Close all objects and free memory buffers. + */ + H5Dclose(did_r); + H5Dclose(did_b); + H5Tclose(tid_b); + H5Fclose(fid); + free(rbuf); + free(wbuf); + + return 0; +} |