XP下采用DirectShow采集摄像头

欢迎大家提出意见,一起讨论!

需要示例源码的请独自联系我.

前提： 摄像头能正常工作、摄像头有创建directshow filter

即

 

大家可以对比我的另一篇文章学习：    wince系统下DirectShow采集摄像头

一、初始化工作

1、DirctShow环境初始化

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::DirectShow_Init()  
3. {  
4.     // initialize the COM library on the current thread  
5.     HRESULT err= CoInitialize(NULL);  
6.   
7.     if( FAILED(err))  
8.     {  
9.         MessageBoxEx( NULL, "Initializing COM library failed!", __FUNCTION__, MB_ICONERROR, 0);  
10.     }  
11.   
12.     return err == S_OK;  
13. }  

bool
uEye_DirectShow_Demo_Dlg::DirectShow_Init()
{
    // initialize the COM library on the current thread
    HRESULT err= CoInitialize(NULL);

    if( FAILED(err))
    {
        MessageBoxEx( NULL, "Initializing COM library failed!", __FUNCTION__, MB_ICONERROR, 0);
    }

    return err == S_OK;
}

2、搜索Video源

如果没有设备接入，那么CreateClassEnumerator会返回失败

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::VideoSourcesList_Fill()  
3. {  
4.     HRESULT status= S_OK;  
5.   
6.     // create System Device Enumerator  
7.     ICreateDevEnum *pSystemDeviceEnumerator= NULL;  
8.     status= CoCreateInstance(  CLSID_SystemDeviceEnum,  
9.                                 NULL,  
10.                                 CLSCTX_INPROC,  
11.                                 IID_ICreateDevEnum,  
12.                                 (void**)&pSystemDeviceEnumerator);  
13.     if( FAILED(status))  
14.     {  
15.         MessageBoxEx( NULL, "Creating System Device Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);  
16.         return false;  
17.     }  
18.   
19.     // create Class Enumerator that lists alls video input devices among the system devices  
20.     IEnumMoniker *pVideoInputDeviceEnumerator= NULL;  
21.     status= pSystemDeviceEnumerator->CreateClassEnumerator( CLSID_VideoInputDeviceCategory,  
22.                                                             &pVideoInputDeviceEnumerator,  
23.                                                             0);  
24.   
25.     // release the System Device Enumerator which is not needed anymore  
26.     pSystemDeviceEnumerator->Release();  
27.     pSystemDeviceEnumerator= NULL;  
28.   
29.     if( status != S_OK)  
30.     {  
31.         MessageBoxEx( NULL, "Creating Class Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);  
32.         return false;  
33.     }  
34.   
35.     // add entry '[no device selected]' to list  
36.     m_comboVideoSources.AddString( "[no device selected]");  
37.     m_comboVideoSources.SetItemDataPtr( 0, NULL);  
38.   
39.     // for each enumerated video input device: add it to the list  
40.     IMoniker *pMoniker= NULL;  
41.     while( pVideoInputDeviceEnumerator->Next( 1, &pMoniker, NULL) == S_OK )  
42.     {  
43.         VARIANT var;  
44.         VariantInit(&var);  
45.   
46.         // make filters properties accessible  
47.         IPropertyBag *pPropBag= NULL;  
48.         status= pMoniker->BindToStorage( 0, 0, IID_IPropertyBag, (void**)&pPropBag);  
49.         if( FAILED(status))  
50.         {  
51.             pPropBag= NULL;  
52.             MessageBoxEx( NULL, "Accessing filter properties failed!", __FUNCTION__, MB_ICONERROR, 0);  
53.             // continue with the next filter  
54.         }  
55.         else  
56.         {  
57.             // add a reference to the storage object  
58.             pPropBag->AddRef();  
59.   
60.             // get the name of this filter  
61.             status= pPropBag->Read( L"FriendlyName", &var, 0);  
62.             if( FAILED(status))  
63.             {  
64.                 MessageBoxEx( NULL, "Reading filter name failed!", __FUNCTION__, MB_ICONERROR, 0);  
65.                 // continue with the next filter  
66.             }  
67.             else  
68.             {  
69.                 // if uEye Capture Device:  
70.                 // add filtername to the list and link the moniker pointer to the list entry  
71.                 CString sTemp(var.bstrVal);  
72. #if (0) /* jma [04/08/2010] add devices named UI... too */  
73.                 if( sTemp.Find( "uEye Capture Device", 0) != -1)  
74. #endif  
75.                 if ((sTemp.Find( "uEye Capture Device", 0) != -1) || (sTemp.Find( "UI", 0) != -1))  
76.                 {  
77.                     int index = m_comboVideoSources.AddString( sTemp);  
78.                     // dont forget to release the moniker later!  
79.                     m_comboVideoSources.SetItemDataPtr( index, pMoniker);  
80.                 }  
81.                 else  
82.                 {  
83.                     pMoniker->Release();  
84.                     pMoniker= NULL;  
85.                 }  
86.             }  
87.   
88.             // release the reference to the storage object  
89.             pPropBag->Release();  
90.             pPropBag= NULL;  
91.         }  
92.   
93.         VariantClear(&var);  
94.     }  
95.   
96.     // release the class enumerator  
97.     pVideoInputDeviceEnumerator->Release();  
98.     pVideoInputDeviceEnumerator= NULL;  
99.   
100.     // select first list entry  
101.     m_comboVideoSources.SetCurSel( 0);  
102.   
103.     return false;  
104. }  

bool
uEye_DirectShow_Demo_Dlg::VideoSourcesList_Fill()
{
    HRESULT status= S_OK;

    // create System Device Enumerator
    ICreateDevEnum *pSystemDeviceEnumerator= NULL;
    status= CoCreateInstance(  CLSID_SystemDeviceEnum,
                                NULL,
                                CLSCTX_INPROC,
                                IID_ICreateDevEnum,
                                (void**)&pSystemDeviceEnumerator);
    if( FAILED(status))
    {
        MessageBoxEx( NULL, "Creating System Device Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    // create Class Enumerator that lists alls video input devices among the system devices
    IEnumMoniker *pVideoInputDeviceEnumerator= NULL;
    status= pSystemDeviceEnumerator->CreateClassEnumerator( CLSID_VideoInputDeviceCategory,
                                                            &pVideoInputDeviceEnumerator,
                                                            0);

    // release the System Device Enumerator which is not needed anymore
    pSystemDeviceEnumerator->Release();
    pSystemDeviceEnumerator= NULL;

    if( status != S_OK)
    {
        MessageBoxEx( NULL, "Creating Class Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    // add entry '[no device selected]' to list
    m_comboVideoSources.AddString( "[no device selected]");
    m_comboVideoSources.SetItemDataPtr( 0, NULL);

    // for each enumerated video input device: add it to the list
    IMoniker *pMoniker= NULL;
    while( pVideoInputDeviceEnumerator->Next( 1, &pMoniker, NULL) == S_OK )
    {
        VARIANT var;
        VariantInit(&var);

        // make filters properties accessible
        IPropertyBag *pPropBag= NULL;
        status= pMoniker->BindToStorage( 0, 0, IID_IPropertyBag, (void**)&pPropBag);
        if( FAILED(status))
        {
            pPropBag= NULL;
            MessageBoxEx( NULL, "Accessing filter properties failed!", __FUNCTION__, MB_ICONERROR, 0);
            // continue with the next filter
        }
        else
        {
            // add a reference to the storage object
            pPropBag->AddRef();

            // get the name of this filter
            status= pPropBag->Read( L"FriendlyName", &var, 0);
            if( FAILED(status))
            {
                MessageBoxEx( NULL, "Reading filter name failed!", __FUNCTION__, MB_ICONERROR, 0);
                // continue with the next filter
            }
            else
            {
                // if uEye Capture Device:
                // add filtername to the list and link the moniker pointer to the list entry
                CString sTemp(var.bstrVal);
#if (0) /* jma [04/08/2010] add devices named UI... too */
                if( sTemp.Find( "uEye Capture Device", 0) != -1)
#endif
                if ((sTemp.Find( "uEye Capture Device", 0) != -1) || (sTemp.Find( "UI", 0) != -1))
                {
                    int index = m_comboVideoSources.AddString( sTemp);
                    // dont forget to release the moniker later!
                    m_comboVideoSources.SetItemDataPtr( index, pMoniker);
                }
                else
                {
                    pMoniker->Release();
                    pMoniker= NULL;
                }
            }

            // release the reference to the storage object
            pPropBag->Release();
            pPropBag= NULL;
        }

        VariantClear(&var);
    }

    // release the class enumerator
    pVideoInputDeviceEnumerator->Release();
    pVideoInputDeviceEnumerator= NULL;

    // select first list entry
    m_comboVideoSources.SetCurSel( 0);

    return false;
}

二、选择某个摄像设备

1、先停止原有的Media

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::FilterGraph_Stop()  
3. {  
4.     Invalidate();  
5.   
6.     // proceed only if filter graph manager object present  
7.     if( m_pActiveFilterGraphManager == NULL)  
8.     {  
9.         return true;  
10.     }  
11.   
12.     HRESULT status= S_OK;  
13.   
14.     // get the MediaControl interface of the graph  
15.     IMediaControl* pMediaControl= NULL;  
16.     status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);  
17.     if( FAILED(status) || pMediaControl == NULL)  
18.     {  
19.         MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);  
20.         return false;  
21.     }  
22.   
23.     //// check for graph to be executing before allowing to stop  
24.   
25.     //OAFilterState filterState= 0;   // OAFilterState is actually a long  
26.     //status= pMediaControl->GetState( 100, &filterState);  
27.     //if( FAILED(status))  
28.     //{  
29.     //    // cleanup  
30.   
31.     //    // release the MediaControl interface object  
32.     //    pMediaControl->Release();  
33.     //    pMediaControl= NULL;  
34.   
35.     //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);  
36.     //    return false;  
37.     //}  
38.   
39.     //if( filterState != State_Stopped)  
40.     {  
41.         // stop the execution of the graph  
42.         status= pMediaControl->Stop();  
43.         if( FAILED(status))  
44.         {  
45.             // cleanup  
46.   
47.             // release the MediaControl interface object  
48.             pMediaControl->Release();  
49.             pMediaControl= NULL;  
50.   
51.             MessageBoxEx( NULL, "Stopping the graph failed!", __FUNCTION__, MB_ICONERROR, 0);  
52.             return false;  
53.         }  
54.   
55.         // update the graph state view  
56.         UpdateGraphState( State_Stopped);  
57.     }  
58.   
59.     // release the MediaControl interface object  
60.     pMediaControl->Release();  
61.     pMediaControl= NULL;  
62.   
63.     return true;  
64. }  

bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Stop()
{
    Invalidate();

    // proceed only if filter graph manager object present
    if( m_pActiveFilterGraphManager == NULL)
    {
        return true;
    }

    HRESULT status= S_OK;

    // get the MediaControl interface of the graph
    IMediaControl* pMediaControl= NULL;
    status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);
    if( FAILED(status) || pMediaControl == NULL)
    {
        MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    //// check for graph to be executing before allowing to stop

    //OAFilterState filterState= 0;   // OAFilterState is actually a long
    //status= pMediaControl->GetState( 100, &filterState);
    //if( FAILED(status))
    //{
    //    // cleanup

    //    // release the MediaControl interface object
    //    pMediaControl->Release();
    //    pMediaControl= NULL;

    //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);
    //    return false;
    //}

    //if( filterState != State_Stopped)
    {
        // stop the execution of the graph
        status= pMediaControl->Stop();
        if( FAILED(status))
        {
            // cleanup

            // release the MediaControl interface object
            pMediaControl->Release();
            pMediaControl= NULL;

            MessageBoxEx( NULL, "Stopping the graph failed!", __FUNCTION__, MB_ICONERROR, 0);
            return false;
        }

        // update the graph state view
        UpdateGraphState( State_Stopped);
    }

    // release the MediaControl interface object
    pMediaControl->Release();
    pMediaControl= NULL;

    return true;
}

2、删除Graph

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::FilterGraph_Destroy()  
3. {  
4.     // proceed only if filter graph manager object present  
5.     if( m_pActiveFilterGraphManager == NULL)  
6.     {  
7.         return true;  
8.     }  
9.   
10.     if( !FilterGraph_Stop())  
11.     {  
12.         return false;  
13.     }  
14.   
15.     // disable 'dump graph' button as long as no graph present  
16.     m_bnDumpGraph.EnableWindow( FALSE);  
17.   
18.     // delete the capture filter  
19.     m_pActiveVideoSource->Release();  
20.     m_pActiveVideoSource= NULL;  
21.   
22.     // delete the graph  
23.     m_pActiveFilterGraphManager->Release();  
24.     m_pActiveFilterGraphManager= NULL;  
25.   
26.     // update the graph state view  
27.     UpdateGraphState( -1);  
28.   
29.     return true;  
30. }  

bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Destroy()
{
    // proceed only if filter graph manager object present
    if( m_pActiveFilterGraphManager == NULL)
    {
        return true;
    }

    if( !FilterGraph_Stop())
    {
        return false;
    }

    // disable 'dump graph' button as long as no graph present
    m_bnDumpGraph.EnableWindow( FALSE);

    // delete the capture filter
    m_pActiveVideoSource->Release();
    m_pActiveVideoSource= NULL;

    // delete the graph
    m_pActiveFilterGraphManager->Release();
    m_pActiveFilterGraphManager= NULL;

    // update the graph state view
    UpdateGraphState( -1);

    return true;
}

 

3、根据选择的设备的moniker来创建Graph

分为:

(1)为选择的设备创建capture filter

 status= pMoniker->BindToObject( 0, 0, IID_IBaseFilter, (void**)&m_pActiveVideoSource);

(2) 创建一个capture Graph Builder对象

ICaptureGraphBuilder2* pCaptureGraphBuilder= NULL;
    status= CoCreateInstance(   CLSID_CaptureGraphBuilder2,
                                NULL,
                                CLSCTX_INPROC,
                                IID_ICaptureGraphBuilder2,
                                (void**)&pCaptureGraphBuilder);

(3) 创建 Filter Graph Manager

  // create the Filter Graph Manager
    status= CoCreateInstance(   CLSID_FilterGraph,
                                NULL,
                                CLSCTX_INPROC,
                                IID_IGraphBuilder,
                                (void **)&m_pActiveFilterGraphManager);

(4) 初始化Capture Graph Builder 对象，把graph和builder 连接起来

   status= pCaptureGraphBuilder->SetFiltergraph( m_pActiveFilterGraphManager);

(5) 增加Capture到graph中

  status= m_pActiveFilterGraphManager->AddFilter( m_pActiveVideoSource, L"Video Capture");

(6) render 视频的capture pin， 把caputre filter和render连接起来

  status= pCaptureGraphBuilder->RenderStream( &PIN_CATEGORY_CAPTURE,
                                                &MEDIATYPE_Video,
                                                m_pActiveVideoSource,
                                                NULL,
                                                NULL);

(7) 查询filter graph manager的VideoWindow接口

 IVideoWindow* pVideoWindow= NULL;
    status= m_pActiveFilterGraphManager->QueryInterface( IID_IVideoWindow, (void**)&pVideoWindow);

(8) 把video view连接到graph

 // connect the dialogs video view to the graph
    CWnd* pwnd= GetDlgItem( IDC_STATIC_VIDEOVIEW);
    pVideoWindow->put_Owner( (OAHWND)pwnd->m_hWnd);  // put_Owner always returns NOERROR

// we dont want a title bar on our video view
    long pWindowStyle = 0;
    pVideoWindow->get_WindowStyle(&pWindowStyle);
    pWindowStyle &= ~WS_CAPTION;
    pVideoWindow->put_WindowStyle(pWindowStyle);

    // adjust graphs video geometry
    CRect rc( 0, 0, 0, 0);
    pwnd->GetClientRect( &rc);
    pVideoWindow->SetWindowPosition( rc.left, rc.top, rc.Width(), rc.Height());

    // release the VideoWindow interface object, we do not need it anymore
    pVideoWindow->Release();

四、  开始播放

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::FilterGraph_Start()  
3. {  
4.     // proceed only if filter graph manager object present  
5.     if( m_pActiveFilterGraphManager == NULL)  
6.     {  
7.         return true;  
8.     }  
9.   
10.     HRESULT status= S_OK;  
11.   
12.     // get the MediaControl interface of the graph  
13.     IMediaControl* pMediaControl= NULL;  
14.     status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);  
15.     if( FAILED(status) || pMediaControl == NULL)  
16.     {  
17.         MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);  
18.         return false;  
19.     }  
20.   
21.     //// check for graph to be stopped before allowing to start  
22.   
23.     //OAFilterState filterState= 0;   // OAFilterState is actually a long  
24.     //status= pMediaControl->GetState( 100, &filterState);  
25.     //if( FAILED(status))  
26.     //{  
27.     //    // cleanup  
28.   
29.     //    // release the MediaControl interface object  
30.     //    pMediaControl->Release();  
31.     //    pMediaControl= NULL;  
32.   
33.     //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);  
34.     //    return false;  
35.     //}  
36.   
37.     //if( filterState == State_Stopped)  
38.     {  
39.         // start the execution of the graph  
40.         status= pMediaControl->Run();  
41.         if( FAILED(status))  
42.         {  
43.             // cleanup  
44.   
45.             // release the MediaControl interface object  
46.             pMediaControl->Release();  
47.             pMediaControl= NULL;  
48.   
49.             MessageBoxEx( NULL, "Starting the graph failed!", __FUNCTION__, MB_ICONERROR, 0);  
50.             return false;  
51.         }  
52.   
53.         // update the graph state view  
54.         UpdateGraphState( State_Running);  
55.     }  
56.   
57.     // release the MediaControl interface object  
58.     pMediaControl->Release();  
59.     pMediaControl= NULL;  
60.   
61.     return true;  
62. }  

bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Start()
{
    // proceed only if filter graph manager object present
    if( m_pActiveFilterGraphManager == NULL)
    {
        return true;
    }

    HRESULT status= S_OK;

    // get the MediaControl interface of the graph
    IMediaControl* pMediaControl= NULL;
    status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);
    if( FAILED(status) || pMediaControl == NULL)
    {
        MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    //// check for graph to be stopped before allowing to start

    //OAFilterState filterState= 0;   // OAFilterState is actually a long
    //status= pMediaControl->GetState( 100, &filterState);
    //if( FAILED(status))
    //{
    //    // cleanup

    //    // release the MediaControl interface object
    //    pMediaControl->Release();
    //    pMediaControl= NULL;

    //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);
    //    return false;
    //}

    //if( filterState == State_Stopped)
    {
        // start the execution of the graph
        status= pMediaControl->Run();
        if( FAILED(status))
        {
            // cleanup

            // release the MediaControl interface object
            pMediaControl->Release();
            pMediaControl= NULL;

            MessageBoxEx( NULL, "Starting the graph failed!", __FUNCTION__, MB_ICONERROR, 0);
            return false;
        }

        // update the graph state view
        UpdateGraphState( State_Running);
    }

    // release the MediaControl interface object
    pMediaControl->Release();
    pMediaControl= NULL;

    return true;
}

五、 pin 特征的查看

如果pin里有自己的查看特征接口, 那么就直接调用接口

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::ShowPinProperties()  
3. {  
4.     // proceed only if video source object present  
5.     if( m_pActiveVideoSource == NULL)  
6.     {  
7.         return true;  
8.     }  
9.   
10.     HRESULT status= S_OK;  
11.   
12.     IPin* pPin= GetPin( m_pActiveVideoSource, PINDIR_OUTPUT, &MEDIATYPE_Video, &PIN_CATEGORY_CAPTURE);  
13.     if( pPin == NULL)  
14.     {  
15.         MessageBoxEx( NULL, "Pin not available!", __FUNCTION__, MB_ICONERROR, 0);  
16.         return false;  
17.     }  
18.   
19.     IUnknown* pFilterUnk= NULL;  
20.     status= pPin->QueryInterface( IID_IUnknown, (void**)&pFilterUnk);  
21.     if( FAILED(status))  
22.     {  
23.         // cleanup  
24.   
25.         pPin->Release();  
26.         pPin= NULL;  
27.   
28.         MessageBoxEx( NULL, "Querying pin's IAMStreamConfig interface failed!", __FUNCTION__, MB_ICONERROR, 0);  
29.         return false;  
30.     }  
31.   
32.     ISpecifyPropertyPages* pSpecifyPropertyPages= NULL;  
33.     status= pFilterUnk->QueryInterface( IID_ISpecifyPropertyPages, (void**)&pSpecifyPropertyPages);  
34.     if( FAILED(status))  
35.     {  
36.         // cleanup  
37.   
38.         pFilterUnk->Release();  
39.         pFilterUnk= NULL;  
40.   
41.         pPin->Release();  
42.         pPin= NULL;  
43.   
44.         MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);  
45.         return false;  
46.     }  
47.   
48.     CAUUID cauuid= { 0, NULL};  
49.     status= pSpecifyPropertyPages->GetPages( &cauuid);  
50.     if( FAILED(status))  
51.     {  
52.         // cleanup  
53.   
54.         pSpecifyPropertyPages->Release();  
55.         pSpecifyPropertyPages->Release();  
56.         pSpecifyPropertyPages= NULL;  
57.   
58.         pFilterUnk->Release();  
59.         pFilterUnk= NULL;  
60.   
61.         pPin->Release();  
62.         pPin= NULL;  
63.   
64.         MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);  
65.         return false;  
66.     }  
67.     pSpecifyPropertyPages->Release();  
68.     pSpecifyPropertyPages->Release();  
69.     pSpecifyPropertyPages= NULL;  
70.   
71.     status= OleCreatePropertyFrame( GetSafeHwnd(),//*this,  
72.                                     0,  
73.                                     0,  
74.                                     OLESTR("uEye Capture Device Pin"),  
75.                                     1,  
76.                                     (IUnknown**)&pFilterUnk,  
77.                                     cauuid.cElems,  
78.                                     (GUID*)cauuid.pElems,  
79.                                     0,  
80.                                     0,  
81.                                     NULL);  
82.   
83.     if( FAILED(status))  
84.     {  
85.         // cleanup  
86.   
87.         CoTaskMemFree( cauuid.pElems);  
88.         cauuid.pElems= NULL;  
89.         cauuid.cElems= 0;  
90.   
91.         pFilterUnk->Release();  
92.         pFilterUnk= NULL;  
93.   
94.         pPin->Release();  
95.         pPin= NULL;  
96.   
97.         MessageBoxEx( NULL, "OleCreatePropertyFrame failed!", __FUNCTION__, MB_ICONERROR, 0);  
98.         return false;  
99.     }  
100.   
101.     // cleanup  
102.   
103.     CoTaskMemFree( cauuid.pElems);  
104.     cauuid.pElems= NULL;  
105.     cauuid.cElems= 0;  
106.   
107.     pFilterUnk->Release();  
108.     pFilterUnk= NULL;  
109.   
110.     pPin->Release();  
111.     pPin= NULL;  
112.   
113.     return true;  
114. }  

bool
uEye_DirectShow_Demo_Dlg::ShowPinProperties()
{
    // proceed only if video source object present
    if( m_pActiveVideoSource == NULL)
    {
        return true;
    }

    HRESULT status= S_OK;

    IPin* pPin= GetPin( m_pActiveVideoSource, PINDIR_OUTPUT, &MEDIATYPE_Video, &PIN_CATEGORY_CAPTURE);
    if( pPin == NULL)
    {
        MessageBoxEx( NULL, "Pin not available!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    IUnknown* pFilterUnk= NULL;
    status= pPin->QueryInterface( IID_IUnknown, (void**)&pFilterUnk);
    if( FAILED(status))
    {
        // cleanup

        pPin->Release();
        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's IAMStreamConfig interface failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    ISpecifyPropertyPages* pSpecifyPropertyPages= NULL;
    status= pFilterUnk->QueryInterface( IID_ISpecifyPropertyPages, (void**)&pSpecifyPropertyPages);
    if( FAILED(status))
    {
        // cleanup

        pFilterUnk->Release();
        pFilterUnk= NULL;

        pPin->Release();
        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    CAUUID cauuid= { 0, NULL};
    status= pSpecifyPropertyPages->GetPages( &cauuid);
    if( FAILED(status))
    {
        // cleanup

        pSpecifyPropertyPages->Release();
        pSpecifyPropertyPages->Release();
        pSpecifyPropertyPages= NULL;

        pFilterUnk->Release();
        pFilterUnk= NULL;

        pPin->Release();
        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }
    pSpecifyPropertyPages->Release();
    pSpecifyPropertyPages->Release();
    pSpecifyPropertyPages= NULL;

    status= OleCreatePropertyFrame( GetSafeHwnd(),//*this,
                                    0,
                                    0,
                                    OLESTR("uEye Capture Device Pin"),
                                    1,
                                    (IUnknown**)&pFilterUnk,
                                    cauuid.cElems,
                                    (GUID*)cauuid.pElems,
                                    0,
                                    0,
                                    NULL);

    if( FAILED(status))
    {
        // cleanup

        CoTaskMemFree( cauuid.pElems);
        cauuid.pElems= NULL;
        cauuid.cElems= 0;

        pFilterUnk->Release();
        pFilterUnk= NULL;

        pPin->Release();
        pPin= NULL;

        MessageBoxEx( NULL, "OleCreatePropertyFrame failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    // cleanup

    CoTaskMemFree( cauuid.pElems);
    cauuid.pElems= NULL;
    cauuid.cElems= 0;

    pFilterUnk->Release();
    pFilterUnk= NULL;

    pPin->Release();
    pPin= NULL;

    return true;
}

六、 查询包含的 filter信息

[cpp] view plain copy print ?

1. bool  
2. uEye_DirectShow_Demo_Dlg::EnumerateFilters()   
3. {  
4.     // proceed only if filter graph builder object present  
5.     if( m_pActiveFilterGraphManager == NULL)  
6.     {  
7.         return false;  
8.     }  
9.   
10.     IEnumFilters *pEnum = NULL;  
11.     IBaseFilter *pFilter;  
12.     ULONG cFetched;  
13.   
14.     HRESULT hr = m_pActiveFilterGraphManager->EnumFilters(&pEnum);  
15.     if (FAILED(hr))  
16.     {  
17.         MessageBoxEx( NULL, "Enumerating filters failed!", __FUNCTION__, MB_ICONERROR, 0);  
18.         return false;  
19.     }  
20.   
21.     CString sInfo( "Filters in the Graph:\n\n");  
22.     int i= 0;  
23.   
24.     while(pEnum->Next(1, &pFilter, &cFetched) == S_OK)  
25.     {  
26.         i++;  
27.   
28.         FILTER_INFO FilterInfo;  
29.         hr = pFilter->QueryFilterInfo(&FilterInfo);  
30.         if (FAILED(hr))  
31.         {  
32.             MessageBoxEx( NULL, "Could not get the filter info", __FUNCTION__, MB_ICONERROR, 0);  
33.             continue;  // Maybe the next one will work.  
34.         }  
35.   
36.         LPWSTR pVendorInfo= NULL;  
37.         hr= pFilter->QueryVendorInfo( &pVendorInfo);  
38.         if( FAILED(hr))  
39.         {  
40.             pVendorInfo= NULL;  
41.         }  
42.   
43.   
44.         if( pVendorInfo != NULL)  
45.         {  
46.             sInfo.AppendFormat( "%d: %S (by %S)\n", i, FilterInfo.achName, pVendorInfo);  
47.             CoTaskMemFree( pVendorInfo);  
48.             pVendorInfo= NULL;  
49.         }  
50.         else  
51.         {  
52.             sInfo.AppendFormat( "%d: %S\n", i, FilterInfo.achName);  
53.         }  
54.   
55.         // The FILTER_INFO structure holds a pointer to the Filter Graph  
56.         // Manager, with a reference count that must be released.  
57.         if (FilterInfo.pGraph != NULL)  
58.         {  
59.             FilterInfo.pGraph->Release();  
60.         }  
61.         pFilter->Release();  
62.     }  
63.   
64.     pEnum->Release();  
65.   
66.     MessageBoxEx( NULL, sInfo.GetBuffer(), __FUNCTION__, MB_OK, 0);  
67.   
68.     return true;  
69. }  

bool
uEye_DirectShow_Demo_Dlg::EnumerateFilters() 
{
    // proceed only if filter graph builder object present
    if( m_pActiveFilterGraphManager == NULL)
    {
        return false;
    }

    IEnumFilters *pEnum = NULL;
    IBaseFilter *pFilter;
    ULONG cFetched;

    HRESULT hr = m_pActiveFilterGraphManager->EnumFilters(&pEnum);
    if (FAILED(hr))
    {
        MessageBoxEx( NULL, "Enumerating filters failed!", __FUNCTION__, MB_ICONERROR, 0);
        return false;
    }

    CString sInfo( "Filters in the Graph:\n\n");
    int i= 0;

    while(pEnum->Next(1, &pFilter, &cFetched) == S_OK)
    {
        i++;

        FILTER_INFO FilterInfo;
        hr = pFilter->QueryFilterInfo(&FilterInfo);
        if (FAILED(hr))
        {
            MessageBoxEx( NULL, "Could not get the filter info", __FUNCTION__, MB_ICONERROR, 0);
            continue;  // Maybe the next one will work.
        }

        LPWSTR pVendorInfo= NULL;
        hr= pFilter->QueryVendorInfo( &pVendorInfo);
        if( FAILED(hr))
        {
            pVendorInfo= NULL;
        }


        if( pVendorInfo != NULL)
        {
            sInfo.AppendFormat( "%d: %S (by %S)\n", i, FilterInfo.achName, pVendorInfo);
            CoTaskMemFree( pVendorInfo);
            pVendorInfo= NULL;
        }
        else
        {
            sInfo.AppendFormat( "%d: %S\n", i, FilterInfo.achName);
        }

        // The FILTER_INFO structure holds a pointer to the Filter Graph
        // Manager, with a reference count that must be released.
        if (FilterInfo.pGraph != NULL)
        {
            FilterInfo.pGraph->Release();
        }
        pFilter->Release();
    }

    pEnum->Release();

    MessageBoxEx( NULL, sInfo.GetBuffer(), __FUNCTION__, MB_OK, 0);

    return true;
}