测试动态链接库 DLL文件

1 \ 生成dll文件

// 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;
}