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Two Delphi 2 questions

Posted on 1997-05-16
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Last Modified: 2010-04-04
How can I:
1) delete the program file of currently running application
2) check the previous running instance of the application and how to select the running application when attempting to run it twice

... both in Delphi 2

... thanx, Bocian
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Question by:Bocian
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icampbe1 earned 50 total points
ID: 1336366
1) I really dont think you can (nor should you be able to).  The program file is treated as a mapped file for the running program.  If you dont have the EXE then you dont have the mapped file, then you dont have the program.  You can't detach the running code (just because it may all be in memory) from the EXE file.

2) Use a Mutex.  If a Mutex is created with CreateMutex(), the lpName parameter holds a unique string identifier.  All of the programs that you want a single instance of should try and call OpenMutex().  OpenMutex will only work if someone actually created the Mutex first with CreateMutex.

Of course, there are kludgier ways like using FindWindow, but that relies on a unique window class or caption name.

Hope this helps...  Cheers,

Ian C.

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by:gysbert1
ID: 1336367
If you really have to delete the .exe you will have to use a killer .exe shipped with the app, maybe cat'ed to the first one and then dinamically written to a file by your app if you know how to do this. Your app will then execute the killer and exit itself. The killer will wait till the app is shut down and then delete the exe.

I used to do stuff like this in high school. Great fun trying to write incrackable copy protection, etc ...
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