Recieving Message

This is a discussion on Recieving Message within the Windows Programming forums, part of the Platform Specific Boards category; I am using MCI to play a sound but i need to know when its finnished so i can close ...

  1. #1
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    Recieving Message

    I am using MCI to play a sound but i need to know when its finnished so i can close it, so i added the notify flag, the msdn documentation says u need to handle the MM_MCINOTIFY message, how do u do this?
    Parinoia Means Having All The Facts!

  2. #2
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    If you want to handle notification messages, you usually put it through WM_COMMAND message. You use a switch statement with HIWORD(wParam) or LOWORD(wParam).

    example
    Code:
    case WM_COMMAND:
    
    			switch(LOWORD(wParam))
    			{
    				case IDOK:
    					SendDlgItemMessage(hwnd, IDC_LIST1, LB_RESETCONTENT, 0, 0);
    				break;
    
    			}
    
    
    			switch(HIWORD(wParam))
    			{
    				char buffer[5];
    				int index;
    
    				case LBN_SELCHANGE:
    				{
    					index = SendDlgItemMessage(hwnd, IDC_LIST1, LB_GETCURSEL, 0, 0);
    					SendDlgItemMessage(hwnd, IDC_LIST1, LB_GETTEXT, index, (LPARAM)buffer);
    					SetDlgItemText(hwnd,IDC_EDIT1,buffer);
    					switch(LOWORD(wParam))
    					{
    						case IDC_LIST1:
    						{
    
    							index = SendDlgItemMessage(hwnd, IDC_LIST1, LB_GETCURSEL, 0, 0);
    							SendDlgItemMessage(hwnd, IDC_LIST1, LB_GETTEXT, index, (LPARAM)buffer);
    							SetDlgItemText(hwnd,IDC_EDIT1,buffer);
    						}
    						break;
    
    					}
    
    				}
    				break;
    			}
    		break;
    Last edited by ganonl; 08-14-2003 at 09:27 PM.

  3. #3
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    >>f you want to handle notification messages, you usually put it through WM_COMMAND message.

    Actually thats command msg's.

    Notify msg's go thru the WM_NOTIFY or WM_PARENTNOTIFY handler.

    Heres some code from MSDN for setting up the device to send the MM msg's.
    The HWND you use will determine the dialog / window that gets the msg.

    I could not find any ref to what type of msg, WM_COMMAND or WM_NOTIFY or just a simple MM_MCINOTIFY will be sent.

    I suggest you write a simple handler, put a break point there and move the code until you get the msg. ie experiment

    Unless someone else knows.........

    Code:
    MCI_DGV_PLAY_PARMS mciPlay; 
    DWORD dwFlags; 
     
    mciPlay.dwCallback = MAKELONG(hwnd, 0); // this dialog / windows callback will get the msg
    dwFlags = MCI_NOTIFY; 
     
    mciSendCommand(wMCIDeviceID, MCI_PLAY, dwFlags, (DWORD)(LPSTR)&mciPlay);
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  4. #4
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    Where would the above switch statement go?

    I suggest you write a simple handler
    how do u do that?
    Parinoia Means Having All The Facts!

  5. #5
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    Why not just try to receive the msg through WM_NOTIFY:
    Code:
    case WM_NOTIFY:
      switch(((LPNMHDR)lParam)->code){
      case MM_MCINOTIFY:
        // Do something
        break;

  6. #6
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    actually, wparam is the reason for the mci message and lparam is the device id code it came from

  7. #7
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    Originally posted by spike232
    Where would the above switch statement go?
    In your main app message processing loop.

  8. #8
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    i dont have a main message processing loop
    what is it?
    Parinoia Means Having All The Facts!

  9. #9
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    In WinMain() you specify the main message loop

  10. #10
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    im making a dll but i dont have access to the main app that will be executing its functions, is there any other way to get this?
    Parinoia Means Having All The Facts!

  11. #11
    mustang benny bennyandthejets's Avatar
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    You could subclass a window in the target process to run your own window procedure, that way you can get the notifications. You'll have to force the .dll to load into the target process using CreateRemoteThread() and LoadLibrary() (complicated process), or using the registry option (slows computer down).

    Does that sound like what you need?
    benforbes@optusnet.com.au
    Microsoft Visual Studio .NET 2003 Enterprise Architect
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  12. #12
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    that sounds like overkill to play a simple mp3 sound

    are there any alternitive methods of playing mp3 files? perferably ones that dont require extra dlls and stuff on the clients machine.
    Parinoia Means Having All The Facts!

  13. #13
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    Open a hidden window and tell it to send the commands to that window.

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