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Re: Pointers problem - Unable to dereference NULL pointer [message #57208 is a reply to message #57207]

Thu, 06 December 2007 06:10

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Romolo Politi writes:

> In may case the main program create the pointer, fill it, and then
> call the procedure for the widget creation.
> the data are writen in the source.
>
> wdg=ptr_new({id:0,set:0,cube:bytarr(5,5),band:0,res:0,flname : "",pre:
> 0,iddata:0,cmx:0,cmy:0,foc:0,circ:0})

Well, then my next thought would be "That's not the pointer
your program is complaining about." My main point is that
when you are building run-time applications, you have to
have enough error handling built in to locate errors when
they occur. You seem to be hoping this is an IDL error.
I'd be willing to bet the balance of the tuition fund
(admittedly not so much now) that it is a programmer error. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Pointers problem - Unable to dereference NULL pointer By: David Fanning on Thu, 06 December 2007 07:09
		Re: Pointers problem - Unable to dereference NULL pointer By: Romolo Politi on Thu, 06 December 2007 07:04
		Re: Pointers problem - Unable to dereference NULL pointer By: David Fanning on Thu, 06 December 2007 06:33
		Re: Pointers problem - Unable to dereference NULL pointer By: Romolo Politi on Thu, 06 December 2007 06:23
		Re: Pointers problem - Unable to dereference NULL pointer By: David Fanning on Thu, 06 December 2007 06:17
		Re: Pointers problem - Unable to dereference NULL pointer By: David Fanning on Thu, 06 December 2007 06:10
		Re: Pointers problem - Unable to dereference NULL pointer By: Romolo Politi on Thu, 06 December 2007 05:17
		Re: Pointers problem - Unable to dereference NULL pointer By: David Fanning on Wed, 05 December 2007 10:00

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