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序號：42798 發表者：redscorpio 發表日期：2003-06-05 22:08:53
<br>主題：在MFC開發的程序中,通過DB-Library開發訪問數據庫時如何實現錯誤處理函數
<br>內容：在控制臺程序中,可用如下語句實現錯誤處理:<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中利用該方法時,編譯無法通過.說數據轉化不一致.<BR>請問高手,如何才能實現錯誤提示功能.<BR>謝謝<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>回復者：孤峰 回復日期：2003-06-27 09:16:35
<br>內容：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>就是這樣使用的，先定義錯誤處理函數，再注冊錯誤處理函數，沒什么問題，我以前做過
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回復者：永遠有多遠 回復日期：2003-07-02 13:19:39
<br>內容：應該是這樣的吧：<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此處不知是你的筆誤還是導致編譯不過的原因
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回復者：redscorpio 回復日期：2003-07-02 22:21:43
<br>內容：謝謝二位。<BR>我現在解決了這個問題。主要是由于dberrhandle和dbmsghandle是C函數，而將其定義為類成員后，編譯是按照C++函數進行編譯，所以編譯不會通過。現在，不將其定義為類成員，并用extern "c"加以聲明，遂通過。<BR>再次，改寫二位。
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