The HDF_VD_GETINFO procedure is a general VData inquiry routine. Set the various keywords to named variables to return information about each field of a VData in an HDF file.
Examples
HDF_VD_GET, Vdat, NFIELDS=n
FOR index=0,n-1 DO BEGIN
HDF_VD_GETINFO, Vdat, index, NAME=n, TYPE=t, ORDER=o
PRINT, index, ':', n, 'TYPE=', t, 'ORDER=', o
ENDFOR
Syntax
HDF_VD_GETINFO, VData, Index [, NAME=variable] [, ORDER=variable] [, SIZE=variable] [, TYPE=variable]
Arguments
VData
The VData handle returned by a previous call to HDF_VD_ATTACH.
Index
A zero-based index specifying which field or the name of the field within the VData to inquire about. For example:
HDF_VD_GETINFO, Vdat, 'VEL', ORDER=order
Keywords
NAME
Set this keyword to a named variable in which the name of the field is returned as a string.
ORDER
Set this keyword to a named variable in which the order of the field is returned.
SIZE
Set this keyword to a named variable in which the size of a data value for the specified field in the VData is returned.
TYPE
Set this keyword to a named variable in which the type of the field is returned. One of the following strings is returned: 'BYTE', 'INT', 'LONG', 'FLOAT', 'DOUBLE'.
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