VC++ 创建及调用Dll

一、_stdcall

被这个关键字修饰的函数，其参数都是从右向左通过堆栈传递的(__fastcall 的前面部分由ecx,edx传)，函数调用在返回前要由被调用者清理堆栈。

这个关键字主要见于Microsoft Visual C、C++。GNU的C、C++是另外一种修饰方式：__attribute__((stdcall))

MathFunsStd.cpp:

 int _stdcall add(int a, int b)

{

return a+b;

}

int _stdcall subtract(int a, int b)

{

return a-b;

}

int _stdcall multiple(int a, int b)

{

return a*b;

}

MathFunsStd.def:

LIBRARY MathFunsStd

EXPORTS

add

subtract

multiple

2.MathFuns.cpp

int add(int a, int b)

{

return a+b;

}

int subtract(int a, int b)

{

return a-b;

}

int multiple(int a, int b)

{

return a*b;

}

MathFuns.def

LIBRARY MathFuns

EXPORTS

add

subtract

multiple

3.UseHeaderAPI

MathFunsUseHeader.h

#ifdef MathFunsUseHeaderAPI

#else

#define MathFunsUseHeaderAPI _declspec(dllimport)

#endif

MathFunsUseHeaderAPI int add(int a,int b);

MathFunsUseHeaderAPI int subtract(int a,int b);

MathFunsUseHeaderAPI int multiple(int a, int b);

#define MathFunsUseHeaderAPI _declspec(dllexport)

#include "MathFunsUseHeader.h"

MathFunsUseHeader.cpp

int add(int a, int b)

{

return a+b;

}

int subtract(int a, int b)

{

return a-b;

}

int multiple(int a, int b)

{

return a*b;

}

三、调用

/*加载dll函数调用方式为默认调用方式*/

HINSTANCE hInst = LoadLibrary(L"MathFuns.dll");

if(!hInst)

{

printf("加载MathFuns.dll失败!\n");

}

typedef int (*MathFunsAPI)(int a, int b);//定义函数指针变量类型

MathFunsAPI Add = (MathFunsAPI)::GetProcAddress(hInst,"add");

printf("5+3=%d\n",Add(,));

::FreeLibrary(hInst);

       //调用dll函数调用方式为_stdcall

HINSTANCE hInstStd = ::LoadLibrary(L"MathFunsStd.dll");

if(!hInstStd)

{

printf("加载MathFunsStd.dll失败!\n");

}

typedef int (_stdcall *MathFunsStdAPI)(int a, int b);//定义函数指针变量类型

MathFunsStdAPI AddStd = (MathFunsStdAPI)::GetProcAddress(hInstStd,"add");

printf("5+3=%d\n",AddStd(,));

::FreeLibrary(hInst);

return ;

巴特西

VC++ 创建及调用Dll

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