Creating object of type HWND from a dll

This is a discussion on Creating object of type HWND from a dll within the Windows Programming forums, part of the Platform Specific Boards category; I am Java programmer who is pretty inexperienced when it comes to windows programming. I am trying to create a ...

  1. #1
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    Question Creating object of type HWND from a dll

    I am Java programmer who is pretty inexperienced when it comes to windows programming. I am trying to create a DLL that calls some native Windows code written by a third party. I can then call this DLL from my Java code via Java Native Interface.

    The problem is, the functions I have to call from the DLL I am writing require that I pass an object of type HWND. In Visual C++ 6, I can get an HWND object if I am creating a Windows Application, but I need to create a Windows DLL, not an Application.

    So, how can I create an object of type HWND inside a DLL? The only reason I have to pass the HWND object is because the native code uses a Windows Timer that it gets from the HWND obejct, so it doesn't have to be a sophisticated HWND object, just one that can supply a Windows Timer.

    Thanks,
    Nick

  2. #2
    &TH of undefined behavior Fordy's Avatar
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    The easiest way I suppose is to use FindWindow()...

    The problem is, the functions I have to call from the DLL I am writing require that I pass an object of type HWND. In Visual C++ 6, I can get an HWND object if I am creating a Windows Application, but I need to create a Windows DLL, not an Application.
    The reason why SetTimer need a HWND is because that window will then process the WM_TIMER messages that are received.....if you have no window that you will not be able to process these messages

  3. #3
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    And you need the same HWND to stop / kill the timer (should you have more than one dlg / window using the same callback).

    GetActiveWindow() could help, 'retrieves the window handle to the active window attached to the calling thread's message queue'.
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