Obtains an HDF file annotation, either label or description.

filename—The name of the HDF file.

status—The status of the function call, where:

Description—A byte array that contains the description for the specified filename/tag/ref object. This byte array may require further processing for display of the description.

Help—If present and nonzero, lists the usage for this routine.

Isfirst—Specifies whether to select the first or next label or description. Values for Isfirst are:

Label—A string variable that contains the label for the specified filename/tag/ref object.

Usage—If present and nonzero, lists the usage for this routine. (Same as the Help keyword.)

HDFGETFILEANN is used to get an HDF file annotation, either a file label or a file description. File labels and file descriptions differ from HDF object labels/descriptions in that you can access multiple labels or descriptions using the Isfirst keyword.

hdf_init

@hdf_common

testfile = !Data_dir + '/raster8.hdf'

newdesc = BYTE (' ')

status = HDFGETFILEANN (testfile, Description=newdesc)

IF (status EQ FAIL) THEN $

   MESSAGE,'Failed HDFGETFILEANN with Description.' $

ELSE PRINT, STRING (newdesc)

HDFPUTFILEANN

Also refer to the following routines in the HDF Reference Manual:

DFANGETFDS, DFANGETFDSLEN, DFANGETFID, DFANGETFIDLEN, HCLOSE, HOPEN

For more information on using the HDF interface and the calling sequence for the entire suite of HDF base functions, refer to PV-WAVE HDF Interface.

For a complete list of the HDF convenience routines, refer to Functional Summary of Routines.