subject_67436.htm

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序号：67436 发表者：hhui 发表日期：2003-12-31 17:54:42
<br>主题：这几个宏是干什么用的
<br>内容：在DXSDK\sample\directshow\capture的例子中有几个宏，不知其用意如何<BR>#define REGISTER_FILTERGRAPH<BR>#ifdef REGISTER_FILTERGRAPH<BR>高手指点
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<font color=red>答案被接受</font><br>回复者：wzlzd 回复日期：2004-01-01 09:27:58
<br>内容：相关的代码是这样的吗？<BR>#define REGISTER_FILTERGRAPH<BR>......<BR>....<BR><BR><BR>#ifdef REGISTER_FILTERGRAPH<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (FAILED(AddGraphToRot(pGB, &amp;g_dwGraphRegister)))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Msg(TEXT(&#34;Failed to register filter graph with ROT!&#34;));<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g_dwGraphRegister = 0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>#endif<BR><BR><BR><BR>#ifdef REGISTER_FILTERGRAPH<BR><BR>HRESULT AddGraphToRot(IUnknown *pUnkGraph, DWORD *pdwRegister) <BR>{<BR>&nbsp;&nbsp;.......<BR>.......<BR>}<BR><BR>void RemoveGraphFromRot(DWORD pdwRegister)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;....<BR>&nbsp;&nbsp;&nbsp;&nbsp;.....<BR>}<BR><BR>#endif<BR><BR>相关的是2个函数 第1个是AddGraphToRot 是将对象加入到运行对象列表中<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;第2个是RemoveGraphFromRot 是将对象从运行对象列表中删除<BR><BR>
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