The HDF_VD_GETID function returns the VData reference number for the next VData in an HDF file after the specified VData_id.
Set VData_id to -1 to return the first VData ID in the file.
Result = HDF_VD_GETID(FileHandle, VData_id)
Returns the next VData reference number.
The HDF file handle returned by a previous call to HDF_OPEN.
The VData reference number, generally obtained by HDF_VD_GETID or HDF_VD_LONE. Set this argument to -1 to return the first VData in the file.
None.
Introduced: 4.0