subject_64435.htm

vc

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序号：64435 发表者：老土人 发表日期：2003-12-10 17:06:05
<br>主题：菜鸟问蔡问题
<br>内容：程序如下：<BR>文件mywinapp.h<BR>class CMyWinApp : public CWinApp<BR>{<BR>.......<BR>public:<BR>CDatabase m_db;<BR>......<BR>}<BR>文件dbsearchdlg.cpp<BR>#include &#34;stdafx.h&#34;<BR>#include &#34;mywinapp.h&#34;<BR>....<BR><BR>BOOL CDBSearchDlg::OnInitDialog() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSerialRecordSet m_serialRecSet(&amp;theApp.m_db);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CSickRecordSet m_sickRecSet(&amp;theApp.m_db);<BR>//CSerialRecordSet和CSickRecordSet派生自CRecordSet，头文件都<BR>//包含了。<BR>编译时如下错误：<BR>error C2065: 'theApp' : undeclared identifier<BR>error C2228: left of '.m_db' must have class/struct/union type<BR>请问前辈们是怎么回事啊？<BR>
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<font color=red>答案被接受</font><br>回复者：wjb 回复日期：2003-12-10 17:10:38
<br>内容：需要在mywinapp.h中<BR>class CMyWinApp : public CWinApp<BR>{<BR>.......<BR>public:<BR>CDatabase m_db;<BR>......<BR>}<BR>后面增加：<BR>extern CMyWinApp theApp;<BR>
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回复者：老土人 回复日期：2003-12-10 17:17:53
<br>内容：谢谢！
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