USB摄像头的interface class GUID

从前做的一个通过USB视频采集自己看看吧void TFormMain::CreatVideo()
{
    IEnumPins **ppEnum;
//初始化，视频操作必须首先初始化
    CoInitialize(NULL);
//获得所有设备列表pDevEnum
    ICreateDevEnum  *pDevEnum =NULL;//所有系统设备列表
    hr = CoCreateInstance (CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC,IID_ICreateDevEnum, (void **)&pDevEnum);
//从所有设备中找到视频设备
    IEnumMoniker *pClassEnum = NULL;//视频类设备列表
    hr = pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pClassEnum, 0);
//通过视频设备列表pClassEnum获得所有视频设备的Moniker，
//并获得视频设备个数g_Total
    IMoniker *pMoniker=NULL;//用来查找视频的中间值
    g_Total=0;//视频设备个数
    if(pClassEnum==NULL)
    {//没有视频设备
        ShowMessage("未安装视频设备");
        pDevEnum->Release();
        return;
    }
    IMoniker *g_pVideoMoniker[10];
    while (hr = pClassEnum->Next(1, &pMoniker, &cFetched), hr == S_OK)
{
g_pVideoMoniker[g_Total] = pMoniker;
        g_Total++;
}
    if(g_Total<2)
    {
        ShowMessage("只有一个摄像头");
        pDevEnum->Release();
        pClassEnum->Release();
        g_pVideoMoniker[0]->Release();
        g_pVideoMoniker[0] = NULL;
        return;
    }
//将设备列表空间释放
    pDevEnum->Release();
pClassEnum->Release();
//将视频设备绑定到过滤器上
    IBaseFilter *pSrc0 = NULL;//基础过滤器
    IBaseFilter *pSrc1 = NULL;//基础过滤器
    if(g_Total>1)//设备0
    {
     hr = g_pVideoMoniker[0]->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc0);
      hr = g_pVideoMoniker[1]->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc1);
        g_pVideoMoniker[0]->Release();
        g_pVideoMoniker[0] = NULL;
        g_pVideoMoniker[1]->Release();
        g_pVideoMoniker[1] = NULL;
    }
    else if(g_Total==1)
    {
      hr = g_pVideoMoniker[0]->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc0);
        ShowMessage("当前只安装了一个视频设备");
        g_pVideoMoniker[0]->Release();
        g_pVideoMoniker[0] = NULL;
    }//创建视频窗
    g_pGraph0 = NULL;//过滤图
    g_pGraph1 = NULL;//过滤图
    hr=CoCreateInstance (CLSID_FilterGraph, NULL, CLSCTX_INPROC,
IID_IGraphBuilder, (void **) &g_pGraph0);
    hr=CoCreateInstance (CLSID_FilterGraph, NULL, CLSCTX_INPROC,
IID_IGraphBuilder, (void **) &g_pGraph1);
//创建捕获窗
    g_pCapture0 = NULL;
    g_pCapture1 = NULL;
    hr=CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,
IID_ICaptureGraphBuilder2, (void **) &g_pCapture0);
    hr=CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,
IID_ICaptureGraphBuilder2, (void **) &g_pCapture1);
//视频窗的媒体控制参数
    IVideoWindow  * g_pVW0 = NULL;
    IMediaControl * g_pMC0 = NULL;
    IVideoWindow  * g_pVW1 = NULL;
    IMediaControl * g_pMC1 = NULL;    g_pGraph0->QueryInterface(IID_IMediaControl,(LPVOID *) &g_pMC0);
g_pGraph0->QueryInterface(IID_IVideoWindow, (LPVOID *) &g_pVW0);
    g_pGraph1->QueryInterface(IID_IMediaControl,(LPVOID *) &g_pMC1);
g_pGraph1->QueryInterface(IID_IVideoWindow, (LPVOID *) &g_pVW1);
//将捕获窗的视频属性设为定义好的视频窗
    g_pCapture0->SetFiltergraph(g_pGraph0);
    g_pCapture1->SetFiltergraph(g_pGraph1);
//创建采样捕获过滤器
    IBaseFilter *pF0 = NULL;//采样捕获过滤器
    IBaseFilter *pF1 = NULL;//采样捕获过滤器
hr = CoCreateInstance( CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID *)&pF0);
hr = CoCreateInstance( CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID *)&pF1);    pGrab0 = NULL;
    pGrab1 = NULL; hr = pF0->QueryInterface( IID_ISampleGrabber, (void **)&pGrab0);
hr = pF1->QueryInterface( IID_ISampleGrabber, (void **)&pGrab1);    pF0->Release();
    pF1->Release();//设定视频格式
//    AM_MEDIA_TYPE   amt0;
//    AM_MEDIA_TYPE   amt1;
memset(&amt0,0, sizeof(AM_MEDIA_TYPE));
amt0.majortype  = MEDIATYPE_Video;
amt0.subtype    = MEDIASUBTYPE_RGB24;
amt0.formattype = FORMAT_VideoInfo;
pGrab0 -> SetMediaType(&amt0);
memset(&amt1, 0,sizeof(AM_MEDIA_TYPE));
amt1.majortype  = MEDIATYPE_Video;
amt1.subtype    = MEDIASUBTYPE_RGB24;
amt1.formattype = FORMAT_VideoInfo;
pGrab1 -> SetMediaType(&amt1);
//设定视频窗的视频格式
hr = g_pGraph0->AddFilter(pF0, L"Sample Grabber");
hr = g_pGraph1->AddFilter(pF1, L"Sample Grabber");
// 将过滤器加到视频窗中.
    hr = g_pGraph0->AddFilter(pSrc0, L"Video Capture");
if(g_Total>1)
    hr = g_pGraph1->AddFilter(pSrc1, L"Video Capture");
// Render the preview pin on the video capture filter
// 捕获窗与过滤器pSrc连接
    hr = g_pCapture0->RenderStream (&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,
pSrc0, NULL, NULL);
if(g_Total>1)
    hr = g_pCapture1->RenderStream (&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,
    pSrc1, NULL, NULL);    pSrc0->Release();//释放过滤器
    pSrc0 = NULL;
if(g_Total>1)
{
    pSrc1->Release();//释放过滤器
    pSrc1 = NULL;
}    g_pVW0->put_Owner((OAHWND)Panel2->Handle);
    g_pVW0->Release();
    g_pVW0 = NULL;
    g_pVW1->put_Owner((OAHWND)Panel2->Handle);
    g_pVW1->Release();
    g_pVW1 = NULL;
//将视频显示到窗体上
    //创建一个窗体
/*
    g_hwnd0 = capCreateCaptureWindow (
        (LPSTR) "My Capture Window0", // window name if pop-up
        WS_CHILD ,      // window style | WS_VISIBLE
        200, 40, 280, 280,              // window position and dimensions
        (HWND) Handle,
        0   );//child ID
    g_hwnd1 = capCreateCaptureWindow (
        (LPSTR) "My Capture Window1", // window name if pop-up
        WS_CHILD ,      // window style | WS_VISIBLE
        600, 40, 280, 280,              // window position and dimensions
        (HWND) Handle,
        0   );//child ID    //视频显示于该窗体
g_pVW0->put_Owner((OAHWND)g_hwnd0);
    g_pVW0->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);
    g_pVW0->put_Height(280);
    g_pVW0->put_Width(280);
g_pVW1->put_Owner((OAHWND)g_hwnd1);
    g_pVW1->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);
    g_pVW1->put_Height(280);
    g_pVW1->put_Width(280);    //获得创建窗体的大小，并将视频尺寸设定得与其一致
RECT grc;
::GetClientRect(g_hwnd0, &grc);
g_pVW0->SetWindowPosition(grc.left, grc.top, grc.right, grc.bottom);
::GetClientRect(g_hwnd1, &grc);
g_pVW1->SetWindowPosition(grc.left, grc.top, grc.right, grc.bottom);
*/
// 开始预览视频
hr = g_pMC0->Run();
hr = pGrab0->SetBufferSamples(TRUE); //设置采样缓存
hr = g_pMC1->Run();
hr = pGrab1->SetBufferSamples(TRUE); //设置采样缓存    g_pMC0->Release();
    g_pMC1->Release();}

调试易

USB摄像头的interface class GUID

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