subject_65860.htm

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序号：65860 发表者：故事 发表日期：2003-12-19 22:55:48
<br>主题：编译通过，链接错误，？？？菜鸟请教各位大侠！
<br>内容：这是directX SDK9b中的一个最简单的console application，在VC＋＋6中编译通过，链接却有错误，我刚开始学习，请问这是什么原因啊？<BR>源码：<BR>#include &lt;Dshow.h&gt;<BR>#include &lt;stdio.h&gt;<BR><BR>void main(void)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;IGraphBuilder *pGraph = NULL;<BR>&nbsp;&nbsp;&nbsp;&nbsp;IMediaControl *pControl = NULL;<BR>&nbsp;&nbsp;&nbsp;&nbsp;IMediaEvent&nbsp;&nbsp; *pEvent = NULL;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Initialize the COM library.<BR>&nbsp;&nbsp;&nbsp;&nbsp;HRESULT hr = CoInitialize(NULL);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (FAILED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&#34;ERROR - Could not initialize COM library&#34;);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Create the filter graph manager and query for interfaces.<BR>&nbsp;&nbsp;&nbsp;&nbsp;hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IID_IGraphBuilder, (void **)&amp;pGraph);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (FAILED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&#34;ERROR - Could not create the Filter Graph Manager.&#34;);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;hr = pGraph-&gt;QueryInterface(IID_IMediaControl, (void **)&amp;pControl);<BR>&nbsp;&nbsp;&nbsp;&nbsp;hr = pGraph-&gt;QueryInterface(IID_IMediaEvent, (void **)&amp;pEvent);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Build the graph. IMPORTANT: Change this string to a file on your system.<BR>&nbsp;&nbsp;&nbsp;&nbsp;hr = pGraph-&gt;RenderFile(L&#34;D:\\Example.avi&#34;, NULL);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (SUCCEEDED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Run the graph.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hr = pControl-&gt;Run();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (SUCCEEDED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Wait for completion.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;long evCode;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pEvent-&gt;WaitForCompletion(INFINITE, &amp;evCode);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Note: Do not use INFINITE in a real application, because it<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// can block indefinitely.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;pControl-&gt;Release();<BR>&nbsp;&nbsp;&nbsp;&nbsp;pEvent-&gt;Release();<BR>&nbsp;&nbsp;&nbsp;&nbsp;pGraph-&gt;Release();<BR>&nbsp;&nbsp;&nbsp;&nbsp;CoUninitialize();<BR>}<BR><BR>错误：<BR>--------------------Configuration: try1 - Win32 Debug--------------------<BR>Linking...<BR>playlist.obj : error LNK2001: unresolved external symbol _IID_IMediaEvent<BR>playlist.obj : error LNK2001: unresolved external symbol _IID_IMediaControl<BR>playlist.obj : error LNK2001: unresolved external symbol _CLSID_FilterGraph<BR>playlist.obj : error LNK2001: unresolved external symbol _IID_IGraphBuilder<BR>Debug/try1.exe : fatal error LNK1120: 4 unresolved externals<BR>Error executing link.exe.<BR><BR>try1.exe - 5 error(s), 0 warning(s)
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回复者：LOVEYUAN 回复日期：2003-12-19 23:44:19
<br>内容：应该是还有几个文件没有包含到你的工程中去。<BR>把那几个文件包含进来就可以了吧。
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回复者：billjdy 回复日期：2003-12-20 00:16:19
<br>内容：哦，昨天碰到的，具体不知道是哪一个，link这么一堆吧<BR>strmbasd.lib quartz.lib msvcrtd.lib winmm.lib msacm32.lib olepro32.lib strmiids.lib kernel32.lib user32.lib gdi32.lib comdlg32.lib ole32.lib oleaut32.lib advapi32.lib uuid.lib <BR>
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回复者：故事 回复日期：2003-12-20 15:48:32
<br>内容：多谢两位，但是billjdy说的这几个lib文件在Microsoft Visual Studio\VC98\LIB路径下都有，而且这个路径已经加到工程里了啊？
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回复者：Ian Zhuang 回复日期：2003-12-20 19:43:23
<br>内容：C:\DX90SDK\Samples\C++\DirectShow\BaseClasses\Debug_Unicode\strmbasd.lib<BR><BR>链接这个文件。
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回复者：故事 回复日期：2003-12-21 19:28:15
<br>内容：谢谢Ian Zhuang！<BR>还是不行啊，C:\DX90SDK\Samples\C++\DirectShow\BaseClasses\ 下找不到Debug_Unicode\strmbasd.lib<BR>这个文件也在Microsoft Visual Studio\VC98\LIB路径下啊？<BR>是不是我有什么头文件没有加进来呢？<BR><BR>
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<font color=red>答案被接受</font><br>回复者：Ian Zhuang 回复日期：2003-12-21 23:24:40
<br>内容：C:\DX90SDK\Samples\C++\DirectShow\dshow.dsw 一定要编译一下。<BR><BR>如果不用Debug_Unicode.&nbsp;&nbsp; 。<BR><BR>以Debug方式编译会生成<BR><BR>C:\DX90SDK\Samples\C++\DirectShow\BaseClasses\Debug\strmbasd.lib文件，<BR><BR>链接它也可以。
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