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Scientific Data Formats: Hierarchical Data Format |
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The HDF_SD_REFTOINDEX function returns a scientific dataset's index given its reference number and SD interface ID.
Result = HDF_SD_REFTOINDEX(SDinterface_id, Reference_number)
Returns the index number associated with the specified SD dataset.
An SD interface ID as returned by HDF_SD_START.
The SD reference number for the desired dataset.
None
; Initialize the SD interface:
SDinterface_id = HDF_SDSTART('demo.hdf')
; Define the reference number for which we want to search:
Reference_number = 66
; Return the index number:
index = HDF_SD_REFTOINDEX(SDinterface_id, Reference_number)
; Now the dataset can be accessed:
SDdataset_id = HDF_SD_SELECT(SDinterface_id, index)
; End access:
HDF_SD_ENDACCESS,SDdataset_id
HDF_SD_END, SDinterface_id
HDF_SD_IDTOREF, HDF_SD_NAMETOINDEX
IDL Online Help (March 06, 2007)