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序号：15218 发表者：ahyu 发表日期：2002-09-16 16:04:53
<br>主题：请教一个警告是怎么回事!!（急）
<br>内容：warning C4251: 'm_strTo' : class 'CString' needs to have dll-interface to be used by clients of class 'CTransport'<BR>
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回复者：ahyu 回复日期：2002-09-16 16:08:14
<br>内容：我在dll中的一个导出类中声明了一个ＣＳｔｒｉｎｇ　ｍ＿ｓｔｒＴｏ变量，结果在应用程序<BR>中赋值的时候就出现了这个警告．请问是怎么回事
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回复者：杀手 回复日期：2002-09-16 17:03:11
<br>内容：Compiler Warning (level 1) C4251<BR>'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'<BR><BR>The specified base class was not declared with the __declspec(dllexport) keyword.<BR><BR>A base class or structure must be declared with the __declspec(dllexport) keyword if a function in a derived class is to be exported.<BR>
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回复者：ahyu 回复日期：2002-09-16 17:09:22
<br>内容：class _declspec(dllexport)CTransport : public CObject <BR>{<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;void ShowHello();<BR>&nbsp;&nbsp;&nbsp;&nbsp;CTransport();<BR>&nbsp;&nbsp;&nbsp;&nbsp;virtual ~CTransport();<BR>&nbsp;&nbsp;&nbsp;&nbsp;BOOL MailSend();<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString m_strMailTo／／-------------warning 处！<BR><BR>};<BR>应该怎么改！？<BR>2002-9-16 17:10:03