调试DirectShow程序的时候，利GraphEdit查看自已程序中的Graph

摘自DirectX帮助文档中的两个函数：

1.下面的这个函数是将我们的IGraphBuilder接口添加到GraphEdit中去.

HRESULT AddToRot(IUnknown *pUnkGraph, DWORD *pdwRegister)
{
IMoniker * pMoniker;
IRunningObjectTable *pROT;
if (FAILED(GetRunningObjectTable(0, &pROT))) {
return E_FAIL;
}
WCHAR wsz[256];
wsprintfW(wsz, L"FilterGraph %08x pid %08x", (DWORD_PTR)pUnkGraph, GetCurrentProcessId());
HRESULT hr = CreateItemMoniker(L"!", wsz, &pMoniker);
if (SUCCEEDED(hr)) {
hr = pROT->Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, pUnkGraph,
pMoniker, pdwRegister);
pMoniker->Release();
}
pROT->Release();
return hr;
}

2.下面的这个函数是从GraphEdit中移除我们的IGraphBuilder.

void RemoveFromRot(DWORD pdwRegister)
{
IRunningObjectTable *pROT;
if (SUCCEEDED(GetRunningObjectTable(0, &pROT))) {
pROT->Revoke(pdwRegister);
pROT->Release();
}
}

3.以上两个函数在程序的使用方法.

IGraphBuilder *pGraph;
DWORD dwRegister;

// Create the filter graph manager.
CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
#ifdef _DEBUG
hr = AddToRot(pGraph, &dwRegister);
#endif

// Rest of the application (not shown).
#ifdef _DEBUG
RemoveFromRot(dwRegister);
#endif
pGraph->Release();

4.打开GraphEdit程序后，点击File菜单->Connect to Remote Graph或Ctrl+G出现一个选窗口点击确定就可以看到你程序中的Graph了！