subject_19274.htm

来自「一些关于vc的问答」· HTM 代码 · 共 12 行

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序号：19274 发表者：海风 发表日期：2002-10-27 15:55:29
<br>主题：error LNK2005 如何定义一个全局变量？
<br>内容：inking...<BR>ContrlDBDlg.obj : error LNK2005: "struct LOGININFO&nbsp;&nbsp;Loginfo" (?Loginfo@@3ULOGININFO@@A) already defined in ContrlDB.obj<BR>LoginDlg.obj : error LNK2005: "struct LOGININFO&nbsp;&nbsp;Loginfo" (?Loginfo@@3ULOGININFO@@A) already defined in ContrlDB.obj<BR>MyAsyncSocket.obj : error LNK2005: "struct LOGININFO&nbsp;&nbsp;Loginfo" (?Loginfo@@3ULOGININFO@@A) already defined in ContrlDB.obj<BR>Debug/ContrlDB.exe : fatal error LNK1169: one or more multiply defined symbols found<BR>Error executing link.exe.<BR><BR><BR>typedef struct <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString&nbsp;&nbsp;&nbsp;&nbsp;m_DBName;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString&nbsp;&nbsp;&nbsp;&nbsp;m_PassWord;<BR>&nbsp;&nbsp;&nbsp;&nbsp;UINT&nbsp;&nbsp;&nbsp;&nbsp;m_Port;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString&nbsp;&nbsp;&nbsp;&nbsp;m_SrvAd;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString&nbsp;&nbsp;&nbsp;&nbsp;m_UsrName;<BR>}LOGININFO;<BR><BR>LOGININFO&nbsp;&nbsp;&nbsp;&nbsp; Loginfo;<BR><BR>class CMyAsyncSocket : public CAsyncSocket<BR>{<BR><BR>}<BR><BR>另一头文件 <BR>// ContrlDBDlg.h : header file<BR>//<BR>#include "MyAsyncSocket.h"<BR>#include "LoginDlg.h"<BR>#include "RryDlg.h"<BR>#include "ListDlg.h"<BR><BR>class CContrlDBDlg : public CDialog<BR>{<BR>// Construction<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;CContrlDBDlg(CWnd* pParent = NULL);&nbsp;&nbsp;&nbsp;&nbsp;// standard constructor<BR>&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OnConnect();<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString&nbsp;&nbsp;MakePassword();<BR>&nbsp;&nbsp;&nbsp;&nbsp;void&nbsp;&nbsp;&nbsp;&nbsp; MakeMsgPg(char* strSQL,unsigned long *tp,unsigned long *SQLlen);<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;CLoginDlg&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LoginDlg;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CRryDlg&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TryDlg;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CMyAsyncSocket&nbsp;&nbsp;m_clientSocket;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CListDlg&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ListDlg; <BR>}<BR><BR>如果我把　LOGINIFOF&nbsp;&nbsp;Logininfo　　移到其它CPP文件中　那么就只有在那个文件中有效<BR>其它CPP文件中用到Logininfo的话就说没定义　为什么？　这不是全局量么？<BR>我把他移到　　theApp全局变量的下面也不行　为什么？　为什么theApp就能在其文件中有效？我的不行　<BR>头痛　　　　<BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR>
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<font color=red>答案被接受</font><br>回复者：凯凯 回复日期：2002-10-27 16:51:30
<br>内容：反它的定义移到　　theApp全局变量的下面。<BR>在需要用到它的CPP文件前面加上这句。<BR>extern LOGININFO&nbsp;&nbsp;&nbsp;&nbsp; Loginfo<BR>就可以了。<BR><BR>记得给分。
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