1 \ 生成dll文件

myDll.h

// MyDll.h: interface for the MyDll class.

//

//////////////////////////////////////////////////////////////////////



#if !defined(AFX_MYDLL_H__E6C7930C_99AF_46AF_B08E_42EDB1680395__INCLUDED_)

#define AFX_MYDLL_H__E6C7930C_99AF_46AF_B08E_42EDB1680395__INCLUDED_



#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000





extern "C"  __declspec(dllexport)  __stdcall int Plus(int x,int y);

extern "C"  __declspec(dllexport)  __stdcall int Sub(int x,int y);

extern "C"  __declspec(dllexport) __stdcall  int Mul(int x,int y);

extern "C"  __declspec(dllexport) __stdcall  int Div(int x,int y);







#endif // !defined(AFX_MYDLL_H__E6C7930C_99AF_46AF_B08E_42EDB1680395__INCLUDED_)

myDll.cpp

// MyDll.cpp: implementation of the MyDll class.

//

//////////////////////////////////////////////////////////////////////



#include "stdafx.h"

#include "MyDll.h"



//////////////////////////////////////////////////////////////////////

// Construction/Destruction

//////////////////////////////////////////////////////////////////////



int __stdcall Plus(int x,int y)

{

	return x+y;

}





int __stdcall Sub(int x,int y)

{

	return x-y;

}





int __stdcall Mul(int x,int y)

{

	return x*y;

}





int __stdcall Div(int x,int y)

{

	return x/y;

}

2\ 使用dll动态链接库

两种使用方法



a - 显示调用,  __declspec(dllimport)



b- 隐示调用,  函数指针的方法







测试代码

// 20171111_01.cpp : Defines the entry point for the console application.

//



#include "stdafx.h"

#include <Windows.h>



#pragma comment(lib,"TestDll.lib")



/*

extern "C" __declspec(dllimport) __stdcall Plus(int x,int y);

extern "C" __declspec(dllimport) __stdcall Sub(int x,int y);

extern "C" __declspec(dllimport) __stdcall Mul(int x,int y);

extern "C" __declspec(dllimport) __stdcall Div(int x,int y);

*/



typedef int (__stdcall *lpPlus) (int x,int y);

typedef int (__stdcall *lpSub) (int x,int y);

typedef int (__stdcall *lpMul) (int x,int y);

typedef int (__stdcall *lpDiv) (int x,int y);





int main(int argc, char* argv[])

{

	lpPlus myPlus;

	lpSub mySub;

	lpMul myMul;

	lpDiv myDiv;

	

	HINSTANCE hModule = LoadLibrary("TestDll.dll");



	myPlus = (lpPlus)GetProcAddress(hModule,"_Plus@8");

	mySub = (lpPlus)GetProcAddress(hModule,"_Sub@8");

	myMul = (lpPlus)GetProcAddress(hModule,"_Mul@8");

	myDiv = (lpPlus)GetProcAddress(hModule,"_Div@8");



	//printf("Hello World!\n");

	int x= mySub(101,11);

	printf("%d \n",x);

	FreeLibrary(hModule);

	return 0;

} 

按照序号导入的代码案例

//隐藏了函数名称，在应用程序中使用序号来导入函数：



#include <windows.h>

#include <stdio.h>



int main()

{

　　typedef int (* AddFunc)(int, int);

　　HMODULE hModule = LoadLibrary("dll.dll");

　　AddFunc add = (AddFunc)GetProcAddress(hModule, MAKEINTRESOURCE(1)); //注意这里序号的指定方式

　　printf("%d\n", add(1, 2));

　　return 0;

}