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Re: Pass Pointer through procedures [message #55255 is a reply to message #55254]

Thu, 09 August 2007 07:11

payon
Messages: 11
Registered: July 2007

Junior Member

Oh thanks Mr. Fanning for your answer.
Well maybe I really read the wrong sources.
But now i tried a look in your book. and i found how to pass
variables through procedures.
But I have a small problem, lke you described it with the examlpe of
the image which is resized.
Of course, this works, but only if the image variable was defined
before the procedure was started. So After the procedure was executed,
the image variable wes changed by through the procedure and could be
read by other procedures.

But my problem is, just again a small example

i start a procedure like

pro imageopen, image
image=fltarr(300,300)
image=openfunction()
end

So here in this small procedure the variable is first defined in the
procedure itself. So it just should have the function as a output
variable, not as input variable-

but the problem is, when i execute the procedure with
IDL> imageopen

and then try to open the image
IDL> tvscl, image

He can't find the variable. So my question is. Can i just pass
variables, when I used them also as input variables, so when i defined
them before i called the procedure?
Like
IDL>image=fltarr(300,300)
IDL>imageopen, image
IDL>tvscl, image

?

greetings

martin

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[Message index]

		Re: Pass Pointer through procedures By: payon on Thu, 09 August 2007 07:19
		Re: Pass Pointer through procedures By: payon on Thu, 09 August 2007 07:11
		Re: Pass Pointer through procedures By: David Fanning on Thu, 09 August 2007 06:04

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