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Terminating application - preventing

Posted on 2001-07-24
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Last Modified: 2010-04-06
I would like to control when user is allowed to close my application either trough Alt-F4 or normaly trough app.
I need to prevent closing of app while I initialise my program (conecting to TCP, loading data etc.).  
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Question by:TomazB
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kretzschmar earned 50 total points
ID: 6311809
just fill out the onclosequery-event

as long it is not allowed,
set there the canclose-var to false
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by:FrodoBeggins
ID: 6311879
Yes, you need to handle OnCloseQuery event on your main form and set the parameter CanClose to False. That ensures that your app will not die by ExitProcess(...) function (e.g. by pressing Alt+F4).
But your process still can be terminated by TerminateProcess(...) function (by any other process, e.g. Task Manager). There is no way to be 100% sure your app will not be colsed in this way.

Rgds,
Frodo
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Expert Comment

by:FrodoBeggins
ID: 6311883
Anyway, no matter the way your application is closed, all the resources will be freed (by Windows). Only if you need to do some specific cleanup there may be a problem

Rgds,
Frodo
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by:Gwena
ID: 6314738
listening  :-)
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by:kretzschmar
ID: 6321295
Hello, TomazB, are you already alive??
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Author Comment

by:TomazB
ID: 6322671
Yes, Yes, sorry for delay. I was out of town for two days.
Thank's kretzschmar!
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