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来自「一些关于vc的问答」· HTM 代码 · 共 21 行

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序号：17885 发表者：Frog 发表日期：2002-10-16 12:40:46
<br>主题：请教,有关CSocket和线程
<br>内容：<BR>void CSocketsView::OnSocketAnswer() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CPort Port;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Get the port number using the<BR>&nbsp;&nbsp;&nbsp;&nbsp;// dialog box.<BR>&nbsp;&nbsp;&nbsp;&nbsp;if( Port.DoModal() == IDOK ){<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Set up the SOCKET_INFO fields<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// for the thread.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.bAbort = FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.bListening = TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.nPort = Port.m_nPort;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Kick off the thread.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CWinThread *lpThread =<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AfxBeginThread( CSocketsView::AnswerThread,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(LPVOID) &m_SocketInfo );<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Store the thread handle for later.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_hCallAnswerThread = lpThread-&gt;m_hThread;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>}<BR><BR>UINT CSocketsView::AnswerThread( LPVOID lpInf )<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;SOCKET_INFO *lpInfo = (SOCKET_INFO *) lpInf;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nRetValue = 0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSocket ServerSocket;<BR>&nbsp;&nbsp;&nbsp;&nbsp;BOOL bDone = FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSocket ClientSocket;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if( !ServerSocket.Create( lpInfo-&gt;nPort ) )//此处报错!!!<BR>&nbsp;&nbsp;&nbsp;&nbsp;……<BR><BR><BR>}<BR><BR>我利用线程来监听客户的连接,可是执行到上面的地方出错:<BR>Unhandled exception in Sockets.exe :0xC0000005: Access Violation<BR>但是代码不写在线程中,写在按钮事件中时却不报错,为什么?<BR>
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回复者：徐景周 回复日期：2002-10-16 13:05:39
<br>内容：追踪一下，看是否在线程中socket没有被关闭时，被create了多次所致。
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回复者：Frog 回复日期：2002-10-16 14:11:29
<br>内容：不是.我重新启机后再调试这个程序也出错.<BR>另外,我不在线程中执行这段代码,却能成功不报错.<BR>Why?
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回复者：紫瑗 回复日期：2002-10-16 14:19:58
<br>内容：DEBUG进去，检查lpInf是否是合法的值，如果你的m_SocketInfo是局部变量的话，就很危险了。<BR>在线程里面搞，一定要注意同步的问题。变量的生存期要考虑清楚。<BR>UINT CSocketsView::AnswerThread( LPVOID lpInf )<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;SOCKET_INFO *lpInfo = (SOCKET_INFO *) lpInf;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nRetValue = 0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSocket ServerSocket;<BR>&nbsp;&nbsp;&nbsp;&nbsp;BOOL bDone = FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSocket ClientSocket;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if( !ServerSocket.Create( lpInfo-&gt;nPort ) )//此处报错!!!<BR>&nbsp;&nbsp;&nbsp;&nbsp;……<BR><BR><BR>}<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.bAbort = FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.bListening = TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_SocketInfo.nPort = Port.m_nPort;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Kick off the thread.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CWinThread *lpThread =<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AfxBeginThread( CSocketsView::AnswerThread,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(LPVOID) &m_SocketInfo );<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Store the thread handle for later.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_hCallAnswerThread = lpThread-&gt;m_hThread;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR><BR>2002-10-16 14:20:42