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Re: Pointers problem - Unable to dereference NULL pointer [message #57207 is a reply to message #57206]

Thu, 06 December 2007 06:17

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> 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. :-)

You know, it just occurs to me that this is *exactly*
the kind of error you are likely to get when you call
a routine that is suppose to block at the command line.
For example, a pop-up dialog of some kind. Since there
*is* no command line in a run-time environment, if these
kinds of routines are not written as "modal" widgets (as
opposed to "blocking" widgets), then a null pointer
reference is entirely likely, since they will run through
their block.

Here is a reference to an article you might find illuminating:

http://www.dfanning.com/widget_tips/modal_blocking.html

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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