Sample Video Window Program (Windows Embedded CE 6.0)

1/6/2010

The following sample program renders a file named Test.avi inside an application window. For brevity, it omits the following functionality:

• It does not resize the video window when the parent window is resized. To accomplish this, call IVideoWindow::SetWindowPosition again in response to a WM_SIZE message on the parent window.
• It performs no error checking.
• It stretches the video window without regard to the aspect ratio of the source. To determine the aspect ratio, use the IBasicVideo interface.
• It does not handle end-of-stream events. For information on how to do this, see Responding to Events.

Note

To make the following code example easier to read, error checking is not included. Do not use this code example in a release configuration unless it you have modified it to include secure error handling.

#include <windows.h>
#include <streams.h>

#define CLASSNAME "VideoWindow"

IGraphBuilder   *pGraph = NULL;
IMediaControl   *pMediaControl = NULL;
IVideoWindow    *pVidWin = NULL;
HWND            g_hwnd;

void PlayFile(void)
{
    // Create the filter graph manager.
    CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, 
        IID_IGraphBuilder, (void **)&pGraph);
    pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
    pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVidWin);

    // Build the graph. 
    pGraph->RenderFile(L"Test.avi", NULL);

    //Set the video window.
    pVidWin->put_Owner((OAHWND)g_hwnd);
    pVidWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);

    RECT grc;
    GetClientRect(g_hwnd, &grc);
    pVidWin->SetWindowPosition(0, 0, grc.right, grc.bottom);

    // Run the graph.
    pMediaControl->Run();
}

void CleanUp(void)
{
    pVidWin->put_Visible(OAFALSE);
    pVidWin->put_Owner(NULL);   
    pMediaControl->Release();
    pVidWin->Release();
    pGraph->Release();
}

// Message handler.
long FAR PASCAL WindowProc( HWND hwnd, UINT msg, UINT wParam, LONG lParam)
{
    switch (msg)
    {
        case WM_DESTROY:
            CleanUp();
            PostQuitMessage(0);
            break;
        default:
            return (DefWindowProc(hwnd, msg, wParam, lParam));
    }
    return(NULL);
}

// Main.
int PASCAL WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR  
pCmdLine, 
    int nCmdShow )
{
    MSG         msg;
    WNDCLASS    wc;

    CoInitialize(NULL);

    ZeroMemory(&wc, sizeof wc);
    wc.lpfnWndProc  = WindowProc;
    wc.hInstance    = hInst;
    wc.hIcon        = LoadIcon( NULL, IDI_APPLICATION );
    wc.hCursor      = LoadCursor( NULL, IDC_ARROW );
    wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
    wc.lpszMenuName = NULL;
    wc.lpszClassName = CLASSNAME;
    RegisterClass( &wc );

    g_hwnd = CreateWindow(
        CLASSNAME,
        "DirectShow Sample",
        (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU |
        WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX),
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInst,
        NULL);

    ShowWindow( g_hwnd, nCmdShow );
    UpdateWindow( g_hwnd );
    PlayFile();

    while( GetMessage( &msg, NULL, 0, 0 ) )
    {
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }

    CoUninitialize();
    return msg.wParam;
}

See Also

Concepts

Setting the Video Window