win  32 - 1400 invalid windows Handle

Posted on 2001-08-05
Last Modified: 2010-04-06

When i"m exit my application i got strange error

win  32 - 1400 invalid windows Handle

why ?
Question by:asi
LVL 20

Expert Comment

ID: 6353922
Hi Asi!

Is it an exception or an error box? Try to go through your program step by step with the IDE debugger.

Regards, Madshi.

Author Comment

ID: 6353940
error box after the FormDestroy finished
LVL 20

Accepted Solution

Madshi earned 50 total points
ID: 6354011
Difficult thing. The only thing I can suggest is this: Compile your project with debug units (see project options) on. This case the debugger can also go through Borland's units (e.g. forms.pas etc) step by step. You'll have to dig and fine the location, where the box is shown. Then you can look at the callstack (see debug menu). Perhaps you'll then find the reason for the error box. You'll have to play Sherlock Holmes...   :-(

Regards, Madshi.
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LVL 11

Expert Comment

ID: 6355454
This sounds as if you mess around with window handles inside Delphi components.
Concentrate on the changed handles.

Expert Comment

ID: 6362842
Hi Madhsi,

I have the same problem when I handle with threads and there's something wrong in the thread. Somehow the resource interfere - I think - and this happens a lot when I access a TTreeView in my thread.

Good luck,
LVL 20

Expert Comment

ID: 6362854
Hi Martin!

>> and this happens a lot when I access a TTreeView in my thread

Fact is that the VCL is not thread safe (shame on Borland). That means you should not access VCL components from other threads than the main thread. You can go around this problem by using pure win32 APIs for updating your tree view.

Regards, Madshi.

Expert Comment

ID: 6844656
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Expert Comment

ID: 6887781
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