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Harris Geospatial / Docs Center / IDL Reference / I/O - HDF / HDF_DFR8_LASTREF

HDF_DFR8_LASTREF

HDF_DFR8_LASTREF

The HDF_DFR8_LASTREF function returns the reference number of the most recently read or written 8-bit image in an HDF file.

Examples


h = HDF_OPEN('myhdf.hdf') ; Open an hdf file.
; IDL prints "0", meaning that the call was successful, 
; but no reference number was available:
PRINT, HDF_DFR8_LASTREF()
; Create a 2D array representing an 8-bit image:
a = BINDGEN(100,100)
; Write the image to the file:
HDF_DFR8_ADDIMAGE, 'myhdf.hdf', a
; IDL prints the reference number for the last 8-bit image
; operation (for example, "2"). Note the reference number 
; is not simply a 1-based "image number"; it could easily be 
; "2" or "3" for the first operation on the file:
PRINT, HDF_DFR8_LASTREF()
HDF_DFR8_ADDIMAGE, 'myhdf.hdf', a ; Add another image.
; IDL prints "2", because we’ve put two 8-bit images in the file:
PRINT, HDF_DFR8_NIMAGES('myhdf.hdf')
HDF_CLOSE, h ; Close the file.

Syntax


Result = HDF_DFR8_LASTREF( )

Return Value


Returns the reference number of the most recently read or written image.

Arguments


None

Keywords


None

Version History


4.0

Introduced

See Also


HDF_DFR8_ADDIMAGE, HDF_DFR8_GETIMAGE, HDF_DFR8_GETINFO, HDF_DFR8_LASTREF, HDF_DFR8_NIMAGES, HDF_DFR8_READREF, HDF_DFR8_RESTART



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