subject_34512.htm

vc

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序号：34512 发表者：Janus 发表日期：2003-03-30 23:24:33
<br>主题：请问各位高手有关dll的问题
<br>内容：&nbsp;&nbsp;我在程序中调用了dll内定义的函数，并成功返回值。但不关程序再次调用这个函数就发生错误，不知如何解决。请各位高手指点一二。<BR>dll内的函数<BR>#include &lt;afx.h&gt;<BR>#include &lt;windows.h&gt;<BR> CString output( int s );<BR><BR>&nbsp;&nbsp;BOOL WINAPI DLLEnterPoint(HINSTANCE hDLL,DWORD dwReason,LPVOID Reserved)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;switch(dwReason)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case DLL_PROCESS_ATTACH:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case DLL_PROCESS_DETACH:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true;<BR>&nbsp;&nbsp;}<BR>&nbsp;&nbsp;CString output( int s )<BR>&nbsp;&nbsp;{&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp; CString answer;<BR>&nbsp;&nbsp;&nbsp;&nbsp; switch(s)<BR>&nbsp;&nbsp;&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp;&nbsp; case 0:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF 01 88 00 00 00 89";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; case 1:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF 01 08 00 00 00 09";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; case 2:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF 02 00 04 00 20 26";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; case 3:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF 02 00 00 00 00 02";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; case 4:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF 0A 88 90 00 40 62";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; default:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; answer="FF FF FF FF FF FF FF";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<BR>&nbsp;&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp;&nbsp;&nbsp; return answer;<BR>&nbsp;&nbsp;}<BR>对话框程序调用<BR>&nbsp;&nbsp;CString m_out=output(s);
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回复者：Janus 回复日期：2003-03-31 10:17:26
<br>内容：点解没人回答啊？？<BR>是不是太简单发了啊<BR>我急需啊<BR>
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回复者：ray111 回复日期：2003-03-31 11:39:10
<br>内容：to return a MFC CSring, you need to select "MFC Extension DLL" in application Wizard for MFC dll. this maybe your problem. <BR><BR>please check attached code for dll and testing dialog. <BR><BR>have a nice day<BR><BR>zhifang
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回复者：Janus 回复日期：2003-03-31 13:07:10
<br>内容：&nbsp;&nbsp; 我使用的是动态链接的，不是静态链接的dll，你的那个程序没有装载的头文件，要改动好难啊，可能我的程度太低了，可否做一个动态的，要有装载的命令啊。请原谅一个初学者的无知，多谢了！！
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回复者：ray111 回复日期：2003-03-31 20:48:59
<br>内容：Here you go. <BR><BR>have nice day!<BR><BR>zhifang
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回复者：Janus 回复日期：2003-03-31 22:07:24
<br>内容：这个文件有问题啊，能通过编译，但运行出错啊!!!当用到dll内的函数时就出错了，是不是dll内的函数返回值不能是字符串啊
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<font color=red>答案被接受</font><br>回复者：ray111 回复日期：2003-03-31 23:37:35
<br>内容：Hi dear, <BR><BR>the project attached has been tested without any problem(VC6, W2000). a bit hint is you have to compile the "dll11" to generate the dll file before running the testing dialog program. Hope this is the problem. <BR><BR><BR>ray 
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回复者：阿蝌 回复日期：2003-04-01 09:00:11
<br>内容：CString *panswer=new CString;<BR>return panswer;<BR>CString 退出后被析构
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