diff options
| -rw-r--r-- | examples/h5_attribute.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/examples/h5_attribute.c b/examples/h5_attribute.c index 13470ab..e0549dd 100644 --- a/examples/h5_attribute.c +++ b/examples/h5_attribute.c @@ -53,7 +53,8 @@ main (void) hid_t attr1, attr2, attr3; /* Attribute identifiers */ hid_t attr; hid_t aid1, aid2, aid3; /* Attribute dataspace identifiers */ - hid_t atype; /* Attribute type */ + hid_t atype, atype_mem; /* Attribute type */ + H5T_class_t type_class; hsize_t fdim[] = {SIZE}; hsize_t adim[] = {ADIM1, ADIM2}; /* Dimensions of the first attribute */ @@ -62,9 +63,9 @@ main (void) herr_t ret; /* Return value */ unsigned i,j; /* Counters */ - int idx; /* Attribute index */ char string_out[80]; /* Buffer to read string attribute back */ int point_out; /* Buffer to read scalar attribute back */ + int num_attr; /* Number of attributes */ /* * Data initialization. @@ -133,7 +134,7 @@ main (void) */ aid3 = H5Screate(H5S_SCALAR); atype = H5Tcopy(H5T_C_S1); - H5Tset_size(atype, 4); + H5Tset_size(atype, 5); H5Tset_strpad(atype,H5T_STR_NULLTERM); attr3 = H5Acreate(dataset, ANAMES, atype, aid3, H5P_DEFAULT); @@ -143,12 +144,13 @@ main (void) ret = H5Awrite(attr3, atype, string); /* - * Close attribute and file dataspaces. + * Close attribute and file dataspaces, and datatype. */ ret = H5Sclose(aid1); ret = H5Sclose(aid2); ret = H5Sclose(aid3); ret = H5Sclose(fid); + ret = H5Tclose(atype); /* * Close the attributes. @@ -187,20 +189,27 @@ main (void) ret = H5Aclose(attr); /* - * Attach to the string attribute using its index, then read and display the value. + * Find string attribute by iterating through all attributes */ - attr = H5Aopen_idx(dataset, 2); - atype = H5Tcopy(H5T_C_S1); - H5Tset_size(atype, 5); - ret = H5Aread(attr, atype, string_out); - printf("The value of the attribute with index 1 is %s \n", string_out); - ret = H5Aclose(attr); - ret = H5Tclose(atype); + num_attr = H5Aget_num_attrs(dataset); + for(i=0; i < num_attr; i++) { + attr = H5Aopen_idx(dataset, i); + atype = H5Aget_type(attr); + type_class = H5Tget_class(atype); + if (type_class == H5T_STRING) { + atype_mem = H5Tget_native_type(atype, H5T_DIR_ASCEND); + ret = H5Aread(attr, atype_mem, string_out); + printf("Found string attribute; its index is %d , value = %s \n", i, string_out); + ret = H5Tclose(atype_mem); + } + ret = H5Aclose(attr); + ret = H5Tclose(atype); + } /* * Get attribute info using iteration function. */ - idx = H5Aiterate(dataset, NULL, attr_info, NULL); + ret = H5Aiterate(dataset, NULL, attr_info, NULL); /* * Close the dataset and the file. |