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Re: Problem Compiling and Using Functions [message #46807 is a reply to message #46806]

Wed, 04 January 2006 14:09

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

someone@someplace.com writes:

> I'm having trouble getting simple functions to work. I have the code
> below in a single file named extract_tiles.pro. When I try and compile
> it gives me a syntax error on the line containing
> "extract_tiles_get_tile(fid)" in the extract_tiles procedure. If I
> change the function to a procedure, comment out the return statement
> and change the function call to a procedure call it works perfectly.
>
> It's probably a simple error, but I can't figure it out. I'm using IDL
> 5.6 and ENVI 3.6.
>
> FUNCTION extract_tiles_get_tile, fImg
> ENVI_FILE_QUERY, fImg, ns=ns, nl=nl
> print, 'Samples: ', ns
> print, 'Lines: ', nl
> RETURN, 0
> END
>
> PRO extract_tiles
> ENVI_OPEN_FILE, 'image.dat', r_fid=fid
> extract_tiles_get_tile(fid)
> END

Functions return a value. Try writing the function call like this:

void = extract_tiles_get_tile(fid)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Problem Compiling and Using Functions By: David Fanning on Wed, 04 January 2006 16:13
		Re: Problem Compiling and Using Functions By: someone[1] on Wed, 04 January 2006 15:51
		Re: Problem Compiling and Using Functions By: Paul Van Delst[1] on Wed, 04 January 2006 14:48
		Re: Problem Compiling and Using Functions By: David Fanning on Wed, 04 January 2006 14:09
		Re: Problem Compiling and Using Functions By: R.Bauer on Sat, 07 January 2006 15:04

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