如何发布IGraphBuilder

问题描述

请考虑以下代码.

HRESULT CSampleGrabber :: Grab(WString szName，long lTime，long width，long height，LONGLONG * lDuration，IStream ** pStream)

HRESULT CSampleGrabber::Grab(WString szName,long lTime,long width, long height, LONGLONG* lDuration, IStream** pStream)

{

if(lDuration == NULL || pStream == NULL)

if(lDuration==NULL || pStream==NULL)

{

返回S_FALSE;

return S_FALSE;

}

HRESULT hr = S_FALSE;

HRESULT hr = S_FALSE;

尝试

{

ComPtr< IGraphBuilder>   pGraphBuilder;

ComPtr<IGraphBuilder>  pGraphBuilder;

ComPtr< IBaseFilter>     pSourceFilter;

ComPtr<IBaseFilter>    pSourceFilter;

ComPtr< IBaseFilter> pColorspaceFilter;

ComPtr<IBaseFilter> pColorspaceFilter;

DSHCall(hr，CoCreateInstance(CLSID_FilterGraph， 

DSHCall(hr,CoCreateInstance(CLSID_FilterGraph, 

NULL，

CLSCTX_INPROC_SERVER，

CLSCTX_INPROC_SERVER,

IID_IGraphBuilder，

IID_IGraphBuilder,

(void **)pGraphBuilder

(void**)pGraphBuilder

));

DSHCall(hr，pGraphBuilder-> AddSourceFilter(szName.c_str()，szName.c_str()，pSourceFilter));

DSHCall(hr,pGraphBuilder->AddSourceFilter(szName.c_str(),szName.c_str(),pSourceFilter));

ComPtr< IPin>出，进;

ComPtr<IPin> out,in;

DSHCall(hr，DShowHelper :: GetVideoPin(pSourceFilter，PINDIR_OUTPUT，false，out));

DSHCall(hr,DShowHelper::GetVideoPin(pSourceFilter,PINDIR_OUTPUT,false,out));

DSHCall(hr，DShowHelper :: CreateFilter(CLSID_Colorspace，pColorspaceFilter));

DSHCall(hr,DShowHelper::CreateFilter(CLSID_Colorspace,pColorspaceFilter));

DSHCall(hr，pGraphBuilder-> AddFilter(pColorspaceFilter，L"Colorspace"));

DSHCall(hr,pGraphBuilder->AddFilter(pColorspaceFilter,L"Colorspace"));

DSHCall(hr，DShowHelper :: GetPin(pColorspaceFilter，PINDIR_INPUT，true，in));

DSHCall(hr,DShowHelper::GetPin(pColorspaceFilter,PINDIR_INPUT,true,in));

DSHCall(hr，pGraphBuilder-> Connect(out，in));

DSHCall(hr,pGraphBuilder->Connect(out,in));

           }

           }

}

我发现，如果调用了Connect，则该图似乎没有释放.

I find that if the Connect is invoked, the graph seems isn't released.

推荐答案

使用以下代码关闭图形

//release after the graph operation has been considered done
if(pGraphBuilder != NULL)
{
 pGraphBuilder->Release();
 pGraphBuilder = NULL;
} 

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