Use of the MCI mciSendString(...) function requiring a window procedure function

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I am using the MCI command

C++

mciSendString(lpszCom,NULL,0,hwndCallback)

inside an MFC dialog and I need to trap the MM_MCINOTIFY message using a window procedure. The hwndCallback parameter is the handle to a callback window. I have coded the following window procedure:

C++

LRESULT CALLBACK MyDlg::WindowProc(HWND hwnd, 
                                   UINT uMsg, 
                                   WPARAM wParam, 
                                   LPARAM lParam)
{   
     switch(uMsg)
     {   case MM_MCINOTIFY:

            // DO SOMETHING HERE
            return 0;

         default:
            return WindowProc(hwnd,uMsg,wParam,lParam);
     }
}

Does anyone know if the Callback function is correctly coded ??
Does anyone know to what the hwndCallback parameter should be set equal to ??

Posted 16-Mar-12 7:40am

Member 8477227

Updated 18-Mar-12 4:08am

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enhzflep · Answer 1 · 2012-03-16T08:02:00

Howdy.

Reading the docs, it appears that your callback function isn't quite right..
mciSendString[^]
MM_MCINOTIFY[^]

If you take a closer look at the command, it will fire a MM_MCINOTIFY message at the window specified in the call to mciSendString. From there, you can determine the reason for the callback - i.e
MCI_NOTIFY_ABORTED, MCI_NOTIFY_FAILURE, MCI_NOTIFY_SUCCESSFUL or MCI_NOTIFY_SUPERSEDED

As for the question of what should hwndCallback hold? Simple, the HWND of the window that you wish to have mciSendString fire the callback message at - i.e, the HWND that owns the MyDlg::WindowProc function.

You may find some useful information in this article: Using mciSendString to play media files[^]

Use of the MCI mciSendString(...) function requiring a window procedure function

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Use of the MCI mciSendString(...) function requiring a window procedure function

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