//实时捕捉图像的播放
void CVideoPlay::RealPlay()
{
    HRESULT hr;
 
    //创建捕捉过滤器图表
    CHECK_ERROR(CoCreateInstance((REFCLSID)CLSID_CaptureGraphBuilder,NULL,
                CLSCTX_INPROC, (REFIID)IID_ICaptureGraphBuilder,(void **)&CapPigb),
                "CoCreateInstance Error");
  
    //创建过滤器图表
    CHECK_ERROR(hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,
                IID_IGraphBuilder, (LPVOID *)&CappFg),"Cannot instantiate filtergraph");

    //将捕捉过滤器图表和过滤器图表进行关联
    hr = CapPigb->SetFiltergraph(CappFg);
    if (hr != NOERROR)
    {
        MessageBox(m_hwnd,"Cannot give graph to builder","Error",MB_OK);
        return;
    }
    int uIndex=0;
    //创建视频设备枚举器
    ICreateDevEnum *pCreateDevEnum;
    hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
              IID_ICreateDevEnum, (void**)&pCreateDevEnum);
    //创建一个类型枚举器，指向系统的视频设备列表
    IEnumMoniker *pEm;
    hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,
                                &pEm, 0);
    HELPER_RELEASE(pCreateDevEnum);
    pEm->Reset();
    ULONG cFetched;
    IMoniker *pM;
    //枚举每个视频设备
    while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)

//实时捕捉图像的播放
void CVideoPlay::RealPlay()
{
    HRESULT hr;
 
    //创建捕捉过滤器图表
    CHECK_ERROR(CoCreateInstance((REFCLSID)CLSID_CaptureGraphBuilder,NULL,
                CLSCTX_INPROC, (REFIID)IID_ICaptureGraphBuilder,(void **)&CapPigb),
                "CoCreateInstance Error");
  
    //创建过滤器图表
    CHECK_ERROR(hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,
                IID_IGraphBuilder, (LPVOID *)&CappFg),"Cannot instantiate filtergraph");

    //将捕捉过滤器图表和过滤器图表进行关联
    hr = CapPigb->SetFiltergraph(CappFg);
    if (hr != NOERROR)
    {
        MessageBox(m_hwnd,"Cannot give graph to builder","Error",MB_OK);
        return;
    }
    int uIndex=0;
    //创建视频设备枚举器
    ICreateDevEnum *pCreateDevEnum;
    hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
              IID_ICreateDevEnum, (void**)&pCreateDevEnum);
    //创建一个类型枚举器，指向系统的视频设备列表
    IEnumMoniker *pEm;
    hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,
                                &pEm, 0);
    HELPER_RELEASE(pCreateDevEnum);
    pEm->Reset();
    ULONG cFetched;
    IMoniker *pM;
    //枚举每个视频设备
    while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)