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GPF on closing application.

Posted on 1997-06-16
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Last Modified: 2010-04-04
Hi,

I have a D1 app that gives a GPF on closing, but only if there are no children open in the main form.  If there is a child open, it closes no problem.  If I step through the
code, it goes all the way through the FormDestroy event handler, and on exit from there goes to the FormResize event handler.  If I F7 past the END ; of that event handler,
I get the GPF.  The FormDestroy handler writes the INI file, and has a few FREEs. Whatever, disabling the code in these event handlers does not alter the behaviour.

The other curious thing is that it only occurs on 1 of many machines we have.  There is nothing peculiar about this machine.

 
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Question by:rossmcm
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3 Comments
 
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icampbe1 earned 200 total points
ID: 1337088
Your problem is almost always an attempt to free an object that doens't exist.  Make sure that you follow each of the frees with a NIL assignment:  Obj.Free;  Obj := NIL;   Subsequent frees will be OK with this.

Also, I'm not sure I understand the sequence of your comment above.  You destroy the form and then resize it???

Anyhow, do the NIL assignments first.  It is a good practice to follow.  If it still doesn't work, we'll look more closely.

Ian C.

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Author Comment

by:rossmcm
ID: 1337089
Tried assignments to NIL after the frees - no change.  

I don't actually destroy the form and then resize it.  
What I think is happening is that the OnResize event
for the main form is being called 'automatically'
because the form has been destroyed.   Removing the
OnResize handler has no effect.

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Expert Comment

by:icampbe1
ID: 1337090
Thanks for the grade..  Is it fixed?  If not, whats different about the machine that it happens on (how is it different from the ones it works on)?
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