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Asked: 2026-05-23T08:32:05+00:00

I’m injecting a DLL into some process, the DLL has a worker thread that

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I’m injecting a DLL into some process, the DLL has a worker thread that is running a message loop.

I’d like to quit the thread properly i.e. post a quit message (PostThreadMessage) and wait for it (WaitForSingleObject).

Where can i wait for this thread to close? I can’t do it on DLL_PROCESS_DETACH because by then all of the threads are closed or terminated and I don’t know when the process is about to close.

My only thought was, Is there a way to intercept the main thread message loop and look for the WM_CLOSE\DESTROY msgs?

I’d love to hear any other ideas\solutions.

Edit:
Tried to hook the main thread using SetWindowsHookEx with WH_CALLWNDPROC but it didn’t worked quite well, I managed to hook and receive the thread’s messages. However, I didn’t received WM_QUIT message only WM_DESTROY and WM_NCDESTROY and they are all were associated with windows.

Thanks,
Omer

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1 Answer

  1. Editorial Team

    If you need to perform some action on “About-To-Close” you need to hook the main thread using SetWindowsHookEx with WH_CALLWNDPROC and look for WM_CLOSE and take action/signal the thread to close.

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