subject_26228.htm

一些关于vc的问答

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序号：26228 发表者：wchunyu 发表日期：2002-12-30 11:23:44
<br>主题：vc中如何定义vb使用的DLL
<br>内容：如下；在vb中打开一串口通讯的dll<BR><BR>Public Declare Function Opencom Lib "Serial.dll" (ByVal nPort As Long, ByVal nBaud As Long) As Long;<BR>Public Declare Function SendData Lib "Serial.dll" (ByVal s As String, ByVal st As String, ByVal n As Long, ByVal m As Long) As Long;<BR>函数在vb中正常<BR><BR>在vc中我作了如下声明：<BR>typedef long (*Opencom)(long&nbsp;&nbsp;nPort, long&nbsp;&nbsp;nBaud);<BR>typedef long (*SendData)(char * s,char *&nbsp;&nbsp;st,long n,long m);<BR><BR>hDLL = ::LoadLibrary("serial.DLL");<BR>opencom = (Opencom)::GetProcAddress(hDLL, "Opencom");<BR>senddata = (SendData)::GetProcAddress(hDLL, "SendData");<BR><BR>编译通过<BR>但执行opencom()报错；<BR><BR>Debug Error!<BR><BR>The value of ESP was not properly saved across a function call.This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.<BR><BR>如何解决，请大家赐教。谢谢！
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回复者：bb 回复日期：2002-12-30 12:05:38
<br>内容：typedef long __stdcall (*Opencom)(long&nbsp;&nbsp;nPort, long&nbsp;&nbsp;nBaud);<BR>typedef long __stdcall (*SendData)(char * s,char *&nbsp;&nbsp;st,long n,long m);<BR><BR>
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回复者：wchunyu 回复日期：2002-12-30 12:37:31
<br>内容：编译过不了<BR>error C2059: syntax error : '('<BR>error C2059: syntax error : '('
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<font color=red>答案被接受</font><br>回复者：bb 回复日期：2002-12-30 13:02:20
<br>内容：sorry. I am wrong.<BR><BR>应该是<BR>typedef long （__stdcall *Opencom)(long&nbsp;&nbsp;nPort, long&nbsp;&nbsp;nBaud);<BR>typedef long （__stdcall *SendData)(char * s,char *&nbsp;&nbsp;st,long n,long m);<BR><BR>
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回复者：wchunyu 回复日期：2002-12-30 14:20:23
<br>内容：谢谢！
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