vc视频采集代码

#include "vfw.h"

HWND ghCapWnd;
CAPDRIVERCAPS gCapDrvCaps;
CString gCapFilename;

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

    //图像处理代码

    return (LRESULT) TRUE ;
}

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

    pWnd = AfxGetMainWnd()->GetDlgItem(IDC_PIC);
    pWnd->GetWindowRect(&rect);
    pWnd->GetSafeHwnd();
    ghCapWnd = capCreateCaptureWindow((LPCTSTR)(_T("视频窗")),
                                            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))/*判断采集窗口是否与0号捕获卡驱动程序相连接，这里采用简化的方法，因只一块捕获卡，计算机自动登记号码通常是为0*/
    {
        capDriverGetCaps(ghCapWnd, &gCapDrvCaps, sizeof(CAPDRIVERCAPS)); /*作默认值初始化，并得到驱动器的性能，存入CAPDRIVERCAPS结构中*/
        if (gCapDrvCaps.fCaptureInitialized) //如初始化成功
        {
            capPreviewRate(ghCapWnd, 33); //设置预视帧频
            capPreview(ghCapWnd, TRUE); /*设置成预视模式（preview），该方式是通过内存作为缓冲区来存放视频数据，它是获得视频数据的必要条件。另一种称为Overlay模式，它是不经过内存而直接将数据传入显存中。它不符合我们要求。*/
            capSetCallbackOnFrame(ghCapWnd, FrameCallbackProc); //设置每帧结束后所调用的回调函数（第二部作解释）
        }
        else{//初始化不成功
            AfxMessageBox("捕获卡初始化失败"); //初始化不成功的消息框显示
            AfxGetMainWnd()->PostMessage(WM_CLOSE);//发送WM_CLOSE消息，关闭对话框
        }
    }
    else{//连接不成功
        AfxMessageBox("捕获卡连接失败"); //连接不成功的消息框显示
    }

    //在OnDestroy中加入结束采集代码
    capDriverDisconnect(ghCapWnd); //断开视频窗口与捕获驱动程序的连接