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Closing Windows Applications programatically

Posted on 1998-01-18
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Last Modified: 2010-04-04
I am using D1 and WIN 3.11
I need a way of closing other open applications from within my ap.  The other programs which may be open, I have written myself in Delphi, but the Title Bars do not contain a caption, so I can't use the obvious API call.
Can someone please provide a code snippet for me.

Thanx in advance
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Question by:jdthedj
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Expert Comment

by:ronit051397
ID: 1356985
Closing a notepad document:
SendMessage(FindWindow('Notepad', nil), wm_Close, 0, 0);
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Author Comment

by:jdthedj
ID: 1356986
Sorry, Ronit, but that won't work because as I mentioned, the ap does not have a caption in the Title Bar.
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Expert Comment

by:JimBob091197
ID: 1356987
Ronit's answer doesn't need a caption in the title bar!  Replace 'notepad' with your form class name:

E.g.  SendMessage(FindWindow(PChar('TMyForm'), nil), WM_CLOSE, 0, 0);

JB
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Author Comment

by:jdthedj
ID: 1356988
Hi JimBob - thanks for replying.  I've just tried your suggestion and I still can't get the Ap to close - any other ideas??  JD

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Expert Comment

by:JimBob091197
ID: 1356989
Mmm...  I've used this method in Delphi 2 & 3, so I assume it should work in Delphi 1.  (The Win api help is the same for Win 3.1 and Win 95.)

You can check it by creating a simple Delphi app, with form class TMyForm.  Create a second app which calls SendMessage(...);  If your first app has no code preventing it from closing, then it should close!  Try also with notepad and Ronit's SendMessage code.

It's possible that Delphi 1 works a little differently from Delphi 2 & 3.  If this is the case try:
In your app to close:
  Application.Title := 'Test App';

In your calling app:
  SendMessage(FindWindow('TApplication', 'Test App'), WM_CLOSE, 0, 0);

I don't think this will work, but try it anyway...

JB
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Author Comment

by:jdthedj
ID: 1356990
Thanks JimBob

I ran a test as you suggested and it worked. I cut and pasted the code to my own calling ap and it didn't work.  I finally realised that both forms were called TMainForm!!
There's 50 points up for grabs if you turn this into an answer  (or should Ronit come back and claim it).

Thanks again.
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Expert Comment

by:ronit051397
ID: 1356991
Jimi deserves the points, mainly for his patience.
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Accepted Solution

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JimBob091197 earned 200 total points
ID: 1356992
Oh, well, if you insist...   ;-)

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Author Comment

by:jdthedj
ID: 1356993
Thanks to both you guys - and sorry, Ronit - My ignorance of WINAPI calls and things I had read led me to believe that you needed a caption to work with.
JD
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