Solved

GPF on closing application.

Posted on 1997-06-16
3
229 Views
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.

 
0
Comment
Question by:rossmcm
  • 2
3 Comments
 
LVL 2

Accepted Solution

by:
icampbe1 earned 100 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.

0
 

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.

0
 
LVL 2

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)?
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Delphi selector screen 2 92
Base1 Encode/Decode 3 90
Using MMsystem To change audio input 1 21
TlistView is Really heavy on Android 3 23
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question