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Scientific Data Formats: Hierarchical Data Format |
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The HDF_SD_FILEINFO procedure retrieves the number of datasets and global attributes in an HDF file.
HDF_SD_FILEINFO, SDinterface_id, Datasets, Attributes
An SD interface ID as returned by HDF_SD_START.
A named variable in which the total number of SD-type objects (i.e., the number of datasets + the number of dimensions) in the file is returned.
A named variable in which the number of global attributes in the file is returned.
None
; Start the SD interface:
SDinterface_id = HDF_SD_START('demo.hdf', /CREATE)
; Set a global attribute:
HDF_SD_ATTRSET,SDinterface_id, 'TITLE', 'MYTITLE'
; Set another one:
HDF_SD_ATTRSET,SDinterface_id, 'TITLE2', 'MYTITLE2'
; Create a dataset:
SDdataset_id = HDF_SD_CREATE(SDinterface_id, 'var1', [10,3])
; Retrieve info about the dataset:
HDF_SD_FILEINFO, SDinterface_id, datasets, attributes
; Print information about the returned variables:
HELP, datasets, attributes
; End SD access:
HDF_SD_ENDACCESS, SDdataset_id
; Close the SD interface:
HDF_SD_END, SDinterface_id
DATASETS LONG = 1 ATTRIBUTES LONG = 2
HDF_SD_ATTRFIND, HDF_SD_ATTRINFO, HDF_SD_START
IDL Online Help (March 06, 2007)