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Re: Pointers problem - Unable to dereference NULL pointer [message #57213 is a reply to message #57208]

Thu, 06 December 2007 05:17

Romolo Politi
Messages: 6
Registered: December 2007

Junior Member

On 5 Dic, 19:00, David Fanning <n...@dfanning.com> wrote:
> Romolo Politi writes:
>> I used pointers to share variables between different procedures.
>> When I compile the project it's all right. If I export the project
>> as .sav there is the error "Unable to dereference NULL pointer".
>> Someone just encountred this problem?
>
> My guess would be that the pointer never got filled
> with data because the program couldn't find the data
> file. You are catching errors, and popping up a dialog
> message, right? So you would know if an error occurred
> in your program during runtime. The data file will,
> unless you are doing something special, have to be
> in the same location as the save file.
>
> 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.")

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})

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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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