subject_20713.htm

一些关于vc的问答

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序号：20713 发表者：chan 发表日期：2002-11-08 20:31:40
<br>主题：关于CList模板类的serialize问题？
<br>内容：各位大虾，你们好，我的程序出了点小问题，请帮我看看：<BR>/////////h<BR>class PlayList:public CObject<BR>{<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;DECLARE_SERIAL(PlayList)<BR>&nbsp;&nbsp;&nbsp;&nbsp;PlayList();<BR>&nbsp;&nbsp;&nbsp;&nbsp;PlayList(const PlayList& pl);<BR>&nbsp;&nbsp;&nbsp;&nbsp;PlayList& operator=(const PlayList& pl);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString ListName; //播放列表项目名称<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString TextName; <BR>&nbsp;&nbsp;&nbsp;&nbsp;CString GifName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString AudioName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;virtual void Serialize(CArchive& ar);<BR>};<BR><BR>///////////ccp<BR>IMPLEMENT_SERIAL(PlayList,CObject,0)<BR>PlayList::PlayList()<BR>{<BR>}<BR>PlayList::PlayList(const PlayList& pl)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;this-&gt;AudioName=pl.AudioName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;this-&gt;GifName=pl.GifName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;this-&gt;ListName=pl.ListName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;this-&gt;TextName=pl.TextName;<BR>}<BR>PlayList& PlayList::operator=(const PlayList& pl)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;AudioName=pl.AudioName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;GifName=pl.GifName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ListName=pl.ListName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;TextName=pl.TextName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;return *this;<BR>}<BR>void PlayList::Serialize(CArchive& ar)<BR>{&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp;TRACE("PlayList::Serialize");<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (ar.IsStoring())<BR>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;// storing code<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ar&lt;&lt;ListName&lt;&lt;TextName&lt;&lt;GifName&lt;&lt;AudioName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;// loading code<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ar&gt;&gt;ListName&gt;&gt;TextName&gt;&gt;GifName&gt;&gt;AudioName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>}<BR>PlayList类的所有东西都列出来的<BR>现在我定义一个全局变量CList&lt;PlayList,PlayList&&gt; g_playList;<BR>在一个TransparentWnd类的构造函数里想把play.lis文件的内容读出来（现在他是空的）<BR>TransparentWnd::TransparentWnd()<BR>{&nbsp;&nbsp; char* pszFileName ="play.lis";<BR>&nbsp;&nbsp;&nbsp;&nbsp;CFile myFile;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CFileException fileException;<BR>&nbsp;&nbsp;&nbsp;&nbsp;if ( !myFile.Open(pszFileName, CFile::modeCreate |&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CFile::modeReadWrite,&fileException ) )<BR>&nbsp;&nbsp;&nbsp;&nbsp;{ TRACE( "Can't open file %s, error = %u\n",<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pszFileName, fileException.m_cause );<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;//从play.lis文件读出播放列表到g_playList存放;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CArchive archive(&myFile, CArchive::load|CArchive::bNoFlushOnDelete);<BR>&nbsp;&nbsp;&nbsp;&nbsp;g_playList.Serialize(archive);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; archive.Close();<BR>&nbsp;&nbsp;&nbsp;&nbsp;myFile.Close();<BR>}<BR>不知道为什么，每一次执行到g_playList.Serialize(archive);会出现一个runtime error<BR>我调试一下，可以看到执行到<BR>template&lt;class TYPE, class ARG_TYPE&gt;<BR>void CList&lt;TYPE, ARG_TYPE&gt;::Serialize(CArchive& ar)<BR>{<BR>。。。。。。。。。。。。。。<BR>DWORD nNewCount = ar.ReadCount();&nbsp;&nbsp;//在这里出错？<BR>}<BR>请大虾多多指点 [e-mail]
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<font color=red>答案被接受</font><br>回复者：redleaf 回复日期：2002-11-10 10:24:03
<br>内容：首先说明一下，我也是才鸟一个，我在这里把我的想法说一下，你可以试一下<BR>在PlayList的定义中加入DECLARE_DYNAMIC(PlayList)宏<BR>然后在实现文件的开始部分加入IMPLEMENT_DYNAMIC(PlayList, CObject)宏
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回复者：草席 回复日期：2002-11-10 10:43:01
<br>内容：建议先测试PlayList类的Serialize功能，然后在测试CList的Serialize功能<BR><BR>我觉得是没有正确使用CList类造成的<BR><BR>楼上的朋友说的好像没什么道理！这个宏与串行化操作没有关系
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回复者：chan 回复日期：2002-11-11 08:41:23
<br>内容：谢谢各位，我已搞定，爽 
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