DirectShow应用程序崩溃后退出main（）

Question

我正在写directshow应用程序。下面的代码工作正常，但崩溃的错误消息“App.exe已停止工作”。整个代码写在下面。请注意，我使用Windows SDK 7.0，它没有atlbase.h，因此我不能使用CComPtr<IBaseFilter> myFilter;类型的指针声明，它应该在退出时清除内存。

编辑：只有我明确连接所有过滤器，应用程序才会崩溃。在这种情况下，我的过滤器的析构函数不会被调用。如果我只是将源代码过滤器连接到渲染器（它将在内部连接我的过滤器和解复用过滤器），我的过滤器的析构函数将被调用并且不会崩溃。我已将宏MANUAL_CONNECT置于导致崩溃的代码上。我已经删除了RemoveFilter通话，并用Release通话替换了它。

我在这里写的应用程序代码：从岗位

void main(WORD32 argc, CHAR *argv[]) 
{ 
     // Initialize the COM library. 
    HRESULT hr = CoInitialize(NULL); 
    if (FAILED(hr)) 
    { 
     printf("ERROR - Could not initialize COM library"); 
     return; 
    } 
    { 
     IGraphBuilder   *pGraph = NULL; 
     IFileSourceFilter  *pFileSourceFilter = NULL; 
     IMediaControl   *pControl = NULL; 
     IMediaEvent    *pEvent = NULL; 
     IBaseFilter    *pSource = NULL; 
     IBaseFilter    *pVideoDecode = NULL; 
     IBaseFilter    *pVideoRenderer = NULL; 
     IEnumPins    *pEnumPins = NULL; 
     IPin     *pPinIn = NULL; 
     IPin     *pPinOut = NULL; 
     ULONG     fetched; 
     PIN_INFO    PinInfo;  
     IEnumFilters   *pEnum = NULL; 
     BOOL     stop = FALSE; 
     int i; 

     // Create the filter graph manager and query for interfaces. 
     hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph); 

     // Create the filter graph manager and query for interfaces. 
     hr = CoCreateInstance(CLSID_AsyncReader, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pSource); 

     hr = pGraph->AddFilter(pSource, NULL); 

     hr = pSource->QueryInterface(IID_IFileSourceFilter, (void**)&pFileSourceFilter); 

     hr = pFileSourceFilter->Load(L"input.mp4", NULL); 

     // Create Ittiam HEVC Decoder instance 
     hr = CoCreateInstance(CLSID_ivdec, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pVideoDecode); 

     // Create Video Renderer instance. We have used default video renderer 
     hr = CoCreateInstance(CLSID_VideoRendererDefault, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pVideoRenderer); 

     // Add decoder filter to the filter graph 
     hr = pGraph->AddFilter(pVideoDecode, NULL); 

     // Add renderer filter to the filter graph 
     hr = pGraph->AddFilter(pVideoRenderer, NULL); 

     /**************************************************************/ 
     /* -- Connecting source filter to demux filter starts here -- */ 
     /**************************************************************/ 
     // Enumerate pins of the source filter 
     hr = pSource->EnumPins(&pEnumPins); 
     hr = pEnumPins->Reset(); 
     // Get pin of source filter. Source filter has only output pin, so no check required 
     hr = pEnumPins->Next(1, &pPinOut, &fetched); 
     hr = pEnumPins->Release(); 
#if MANUAL_CONNECT 
     // Enumerate pins of the decoder filter 
     hr = pVideoDecode->EnumPins(&pEnumPins); 
     hr = pEnumPins->Reset(); 
     // Get pin of decoder filter. Decoder filter has 2 pins, so ensure the selected pin is input pin. 
     // If not, get another pin 
     hr = pEnumPins->Next(1, &pPinIn, &fetched); 
     hr = pPinIn->QueryPinInfo(&PinInfo); 
     if(PINDIR_OUTPUT == PinInfo.dir) 
     { 
      hr = pPinIn->Release(); 
      hr = pEnumPins->Next(1, &pPinIn, &fetched); 
     } 

     // Connect output pin of demux filter to input pin of decoder filter 
     hr = pGraph->Connect(pPinOut, pPinIn); 

     /*************************************************************/ 
     /* -- Connecting demux filter to decoder filter ends here -- */ 
     /*************************************************************/ 

     /******************************************************************/ 
     /* -- Connecting decoder filter to renderer filter starts here -- */ 
     /******************************************************************/ 
     // Enumerate pins of the decoder filter 
     hr = pVideoDecode->EnumPins(&pEnumPins); 
     hr = pEnumPins->Reset(); 
     // Get pin of decoder filter. Decoder filter has 2 pins, so ensure the selected pin is output pin. 
     // If not, get another pin 
     hr = pEnumPins->Next(1, &pPinOut, &fetched); 
     hr = pPinOut->QueryPinInfo(&PinInfo); 
     if(PINDIR_INPUT == PinInfo.dir) 
     { 
      hr = pPinOut->Release(); 
      hr = pEnumPins->Next(1, &pPinOut, &fetched); 
     } 
     hr = pEnumPins->Release(); 
#endif 

     // Enumerate pins of the renderer filter 
     hr = pVideoRenderer->EnumPins(&pEnumPins); 
     hr = pEnumPins->Reset(); 
     // Get pin of renderer filter. Renderer filter has only input pin, so no check required 
     hr = pEnumPins->Next(1, &pPinIn, &fetched); 
     hr = pPinIn->QueryPinInfo(&PinInfo); 

     // Connect output pin of decoder filter to input pin of renderer filter 
     hr = pGraph->Connect(pPinOut, pPinIn); 

     /****************************************************************/ 
     /* -- Connecting decoder filter to renderer filter ends here -- */ 
     /****************************************************************/ 

     hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl); 
     hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent); 

     // Run the graph. 
     hr = pControl->Run(); 

     if (SUCCEEDED(hr)) 
     { 
      // Wait for completion. 
      long evCode; 
      pEvent->WaitForCompletion(INFINITE, &evCode); 

      // Note: Do not use INFINITE in a real application, because it 
      // can block indefinitely. 
     } 

     hr = pControl->Stop(); 

     hr = pSource->Release(); 
     hr = pVideoDecode->Release(); 
     hr = pControl->Release(); 
     hr = pEvent->Release(); 
     hr = pGraph->Release(); 
    } 

    CoUninitialize(); 
    printf("Exiting main!!\n"); 
} 

我已删除了错误检查，但我有我的代码中的所有错误检查。我可以看到Exiting main!!打印，但比应用程序崩溃。有关如何调试的建议？请让我知道是否有任何信息丢失。我正在使用Microsoft Visual C++ 2010 Express进行我的开发。

Answer 1

在调用CoUninitialize之前，您必须终止线程上的所有COM活动（特别是：释放所有COM接口指针），您不这样做。

例如，请参见this code及其Release调用底部的_tmain。

使用更新版本的Visual Studio（2013,2015），其中免费社区版已包含ATL，您可以使用CComPtr和朋友享受自动COM接口参考管理。对于那些使用原始COM接口指针的用户来说，这是第一个建议，并且遇到了错误管理它们的问题。

参见：

• Not releasing filter com object causing a crash
• Unreleased DirectShow CSource filter makes program crash at process shutdown
• Why does CoUninitialize cause an error on exit?

UPDATE：使用原始指针不准确，你一直有泄漏：

hr = pGraph->Connect(pPinOut, pPinIn); 
    // ... 
    hr = pEnumPins->Next(1, &pPinOut, &fetched); 

IEnumPin::Next调用覆盖pPinOut指针并泄漏一个引用。