VC dll的调用技巧

最新推荐文章于 2024-08-02 23:54:04 发布

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最新推荐文章于 2024-08-02 23:54:04 发布

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原文链接：http://www.cnblogs.com/enterBeijingThreetimes/archive/2009/03/14/1411561.html

Dll2.cpp:

int add(int a,int b)
{
return a+b;
}

int substract(int a,int b)
{
return a-b;
}

Dll2.def:

LIBRARY D112

EXPORTS
add
substract

正确调用：

HMODULE hMod=LoadLibrary("Dll2.dll");
typedef int (/*_stdcall*/ *MSGBOX)(int a,int b);
MSGBOX he=(MSGBOX)GetProcAddress(hMod,/*MAKEINTRESOURCE(1)*/"add");
if (!he)
    {
        // handle the error
        FreeLibrary(hMod);
  int i=GetLastError();
  CString str_err;
  str_err.Format("错误：%d",i);
        AfxMessageBox(str_err);
    }

CString str;
//int i=he(2,3);
str.Format("5+3=%d",he(5,3));
MessageBox(str);

错误调用：

HMODULE hMod=LoadLibrary("Dll2.dll");
typedef int (_stdcall *MSGBOX)(int a,int b);
MSGBOX he=(MSGBOX)GetProcAddress(hMod,/*MAKEINTRESOURCE(1)*/"add");
if (!he)
    {
        // handle the error
        FreeLibrary(hMod);
  int i=GetLastError();
  CString str_err;
  str_err.Format("错误：%d",i);
        AfxMessageBox(str_err);
    }

CString str;
//int i=he(2,3);
str.Format("5+3=%d",he(5,3));
MessageBox(str);

转载于:https://www.cnblogs.com/enterBeijingThreetimes/archive/2009/03/14/1411561.html