用VC调用C写的DLL出错！

[mudboy]

C的DLL我已在C下测试过，没问题，调用的原型如下：
SLogResult * getLogResult(char whereclause[300])

SLogResult * CLogPickDlg::LoadDLLGetLog(CString filter)
{
typedef UINT (CALLBACK* LPFNGETLOG)(char fi[300]);

HINSTANCE hInstance1;
LPFNGETLOG lpSquartRoot1;
hInstance1 = ::LoadLibrary("getlog.exe");
if (hInstance1 != NULL)
{

lpSquartRoot1 = (LPFNGETLOG)::GetProcAddress(hInstance1,"getLogResult");
if(!lpSquartRoot1)
{
::FreeLibrary(hInstance1);
AfxMessageBox("定位动态链接库方法出错!!!");
}
else
{
char fil[300];
const char *fil1=NULL;
fil1=(LPCTSTR)filter;
strcpy(fil,fil1);
strcat(fil,"\0");
this->p_logfromc=(SLogResult *)lpSquartRoot1(fil);//err
this->getLogFromC();

}
::FreeLibrary(hInstance1);
}
return p_logfromc;
}


但运行时总是出错（Debug error,the value of ESP was not properly saved across a function call....)
可我的参数信息没错呀，专家指导一下！·

[kingzai]

This error is most commonly called by mixing __stdcall and
__cdecl.

In one definition, you specify __stdcall. In the other you don't,
and the function defaults to __cdecl. __stdcall and __cdecl
calling conventions have different rules regarding parameter
passing and stack cleanup. The debugger is telling you that
your code has messed up the stack.

[Zark]

这一句是不是要检查一下？

typedef UINT (CALLBACK* LPFNGETLOG)(char fi[300]);

[whoo]

Extern "C" 函数定义

[mudboy]

kingzai(kingzai)
那你说该怎么办呢？

[njtu]

typedef UINT (CALLBACK* __stdcall LPFNGETLOG)(char fi[300]);

//不知行不行。

和这个问题相关大家来看看。

http://expert.csdn.net/Expert/topic/2138/2138152.xml?temp=.4941675

[mudboy]

不行，还是出同样的错误！

[mudboy]

我另外一个方法是没有参数的，这样用不会有问题，
也就是说，问题的关键在于参数。

[shaojichibang]

up

[Cline]

谁分配的内存，就让它提供一个释放内存的函数，用完后调用之!

[Zark]

把这个函数
SLogResult * getLogResult(char whereclause[300]);
贴出来,同时把SLogResult的定义贴出来.

[mudboy]

我这样写可以调用过去，可是过去以后就出错了（到调用者函数的结尾处）这应该跟栈有关。
希望大家多多帮助！

void CLogPickDlg::LoadDLLGetLog(CString filter)
{


typedef SLogResult * (LPFNGETLOG)(char[]);
HINSTANCE hInstance1;
LPFNGETLOG *lpSquartRoot1;
hInstance1 = ::LoadLibrary("win32dll.dll");
if (hInstance1 != NULL)
{

lpSquartRoot1 = (LPFNGETLOG *)::GetProcAddress(hInstance1,"getLogResult");
if(!lpSquartRoot1)
{
::FreeLibrary(hInstance1);
AfxMessageBox("定位动态链接库方法出错!!!");
return;
}
else
{
CString tempstr;
char fil[300];
const char *fil1=NULL;
fil1=(LPCTSTR)filter;
strcpy(fil,fil1);
this->p_logfromc=lpSquartRoot1(fil);

while((p_logfromc[i].id!="")&&(i<MAXRESULT))
{

}
::FreeLibrary(hInstance1);
}
return;

}

[mudboy]

已经得到解决，是我的DLL内存管理有问题，但是我用C调用该DLL时并没有出问题。不知道这是为什么？