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Harris Geospatial / Docs Center / IDL Reference / I/O - HDF / HDF_VG_GETID

HDF_VG_GETID

HDF_VG_GETID

The HDF_VG_GETID function returns the VGroup ID for the next VGroup after the specified VGroup_id in an HDF file. Use a VGroup_id of -1 to get the first VGroup in the file.

Examples


See HDF_SD_IDTOREF for an example using this function.

Syntax


Result = HDF_VG_GETID(FileHandle, VGroup_id)

Return Value


Returns the next VGroup ID.

Arguments


FileHandle

The HDF file handle returned from a previous call to HDF_OPEN.

VGroup_id

The VGroup reference number, generally obtained by HDF_VG_GETID or HDF_VG_LONE.

Keywords


None

Version History


4.0

Introduced



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