subject_42798.htm

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序号：42798 发表者：redscorpio 发表日期：2003-06-05 22:08:53
<br>主题：在MFC开发的程序中,通过DB-Library开发访问数据库时如何实现错误处理函数
<br>内容：在控制台程序中,可用如下语句实现错误处理:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dberrhandle (err_handler);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dbmsghandle (msg_handler);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ...<BR>&nbsp;&nbsp; int err_handler(PDBPROCESS, INT, INT, INT, LPCSTR, LPCSTR);<BR>int msg_handler(PDBPROCESS, DBINT, INT, INT, LPCSTR, LPCSTR,LPCSTR, BUSMALLINT);<BR>但是,我在MFC中利用该方法时,编译无法通过.说数据转化不一致.<BR>请问高手,如何才能实现错误提示功能.<BR>谢谢<BR><BR>&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>
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<font color=red>答案被接受</font><br>回复者：孤峰 回复日期：2003-06-27 09:16:35
<br>内容：int CSQLDataBase::dbwinErrorHandler(PDBPROCESS dbproc, INT severity, INT errno, INT oserr, LPCSTR dberrstr, LPCSTR oserrstr)<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;<BR>&nbsp;&nbsp; static CString ErrStr;<BR>&nbsp;&nbsp; MessageBox(NULL,dberrstr,(LPSTR)"DB-LIBRARY error",MB_ICONHAND | MB_OK);<BR>&nbsp;&nbsp; MessageBox(NULL,dberrstr,(LPSTR)"DB-LIBRARY error",MB_ICONHAND | MB_OK);<BR>&nbsp;&nbsp; if (oserr != DBNOERR)&nbsp;&nbsp; /* os error */<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MessageBox(NULL,oserrstr,(LPSTR)"Operating-System error",MB_ICONHAND | MB_OK);<BR><BR>&nbsp;&nbsp; return(INT_CANCEL);&nbsp;&nbsp;/* cancel command */<BR>}<BR>就是这样使用的，先定义错误处理函数，再注册错误处理函数，没什么问题，我以前做过
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回复者：永远有多远 回复日期：2003-07-02 13:19:39
<br>内容：应该是这样的吧：<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dberrhandle (err_handler);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dbmsghandle (msg_handler);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ...<BR>int err_handler(PDBPROCESS, INT, INT, INT, LPCSTR, LPCSTR);<BR>int msg_handler(PDBPROCESS, DBINT, INT, INT, LPCSTR, LPCSTR,LPCSTR,DBUSMALLINT);<BR><BR>DBUSMALLINT此处不知是你的笔误还是导致编译不过的原因
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回复者：redscorpio 回复日期：2003-07-02 22:21:43
<br>内容：谢谢二位。<BR>我现在解决了这个问题。主要是由于dberrhandle和dbmsghandle是C函数，而将其定义为类成员后，编译是按照C++函数进行编译，所以编译不会通过。现在，不将其定义为类成员，并用extern "c"加以声明，遂通过。<BR>再次，改写二位。
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