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#include "vfw.h"

HWND ghCapWnd;
CAPDRIVERCAPS gCapDrvCaps;
CString gCapFilename; 

LRESULT CALLBACK FrameCallbackProc(HWND ghWnd, LPVIDEOHDR lpVData)
{
    if (!ghCapWnd) 
        return FALSE; 

    //圖像處理代碼

    return (LRESULT) TRUE ; 
}

    //在OnInitDialog中添加初始化代碼
    CWnd *pWnd;
    CRect rect;

    pWnd = AfxGetMainWnd()->GetDlgItem(IDC_PIC);
    pWnd->GetWindowRect(&rect);
    pWnd->GetSafeHwnd();
    ghCapWnd = capCreateCaptureWindow((LPCTSTR)(_T("視頻窗")),
                                            WS_CHILD|WS_VISIBLE|WS_EX_CLIENTEDGE|WS_EX_DLGMODALFRAME,
                                            0,
                                            0,
                                            rect.Width(),
                                            rect.Height(),
                                            pWnd->GetSafeHwnd(),
                                            0);
    ASSERT(ghCapWnd);
    if (capDriverConnect(ghCapWnd, 0))/*判斷采集窗口是否與0號捕獲卡驅動(dòng)程序相連接，這里采用簡(jiǎn)化的方法，因只一塊捕獲卡，計算機自動(dòng)登記號碼通常是為0*/
    {
        capDriverGetCaps(ghCapWnd, &gCapDrvCaps, sizeof(CAPDRIVERCAPS)); /*作默認值初始化，并得到驅動(dòng)器的性能，存入CAPDRIVERCAPS結構中*/
        if (gCapDrvCaps.fCaptureInitialized) //如初始化成功
        {
            capPreviewRate(ghCapWnd, 33); //設置預視幀頻
            capPreview(ghCapWnd, TRUE); /*設置成預視模式（preview），該方式是通過(guò)內存作為緩沖區來(lái)存放視頻數據，它是獲得視頻數據的必要條件。另一種稱(chēng)為Overlay模式，它是不經(jīng)過(guò)內存而直接將數據傳入顯存中。它不符合我們要求。*/
            capSetCallbackOnFrame(ghCapWnd, FrameCallbackProc); //設置每幀結束后所調用的回調函數（第二部作解釋?zhuān)?br>        }
        else{//初始化不成功
            AfxMessageBox("捕獲卡初始化失敗"); //初始化不成功的消息框顯示
            AfxGetMainWnd()->PostMessage(WM_CLOSE);//發(fā)送WM_CLOSE消息，關(guān)閉對話(huà)框
        }
    }
    else{//連接不成功
        AfxMessageBox("捕獲卡連接失敗"); //連接不成功的消息框顯示
    }

    //在OnDestroy中加入結束采集代碼
    capDriverDisconnect(ghCapWnd); //斷開(kāi)視頻窗口與捕獲驅動(dòng)程序的連接