VC生成DLL并且调用DLL文件

 打开VC 新建 工程 Win32 Dynamic~Link Library 名字“MakeDll”
 新建class  MakeDll
 MakeDll.h
// MakeDLL.h: interface for the MakeDLL class.
#if !defined(AFX_MAKEDLL_H__AEA598EA_1138_4F09_A882_F655B1DEA725__INCLUDED_)
#define AFX_MAKEDLL_H__AEA598EA_1138_4F09_A882_F655B1DEA725__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
extern "C" _declspec(dllexport) int sum(int a,int b);//
class MakeDLL  
{
public:
	MakeDLL();
	virtual ~MakeDLL();

};

#endif // !defined(AFX_MAKEDLL_H__AEA598EA_1138_4F09_A882_F655B1DEA725__INCLUDED_)


MakeDll.cpp

#include "MakeDLL.h"

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

#include "windows.h"

BOOL APIENTRY DllMain(
HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
return TRUE;
}
extern "C" _declspec(dllexport)int sum(int a, int b)
{
return a+b;
}

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

MakeDLL::MakeDLL()
{

}

MakeDLL::~MakeDLL()
{

}

编译生成MakeDll.dll文件
调用DLL ：

新建工程 Wind32 Console Application  
DllTest
DllTest.h

#if !defined(AFX_DLLTEST_H__E15FF510_5A00_4C68_9A3F_E34173E64BBC__INCLUDED_)
#define AFX_DLLTEST_H__E15FF510_5A00_4C68_9A3F_E34173E64BBC__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class DllTest  
{
public:
	DllTest();
	virtual ~DllTest();

};

#endif // !defined(AFX_DLLTEST_H__E15FF510_5A00_4C68_9A3F_E34173E64BBC__INCLUDED_)
DllTest.cpp#include "DllTest.h"
#include "stdio.h"
#include<windows.h>
//////////////////////////////////////////////////////////////////////
void main(void)
{


HINSTANCE hDLL;
hDLL=LoadLibrary("MakeDll.dll");//加载动态链接库MyDll.dll文件；
typedef int( *pSum)(int a,int b);

pSum Sum ;
//= 
Sum=(pSum)GetProcAddress(hDLL,"sum");
int a = Sum(5,8);
printf("%d",a);
}
//////////////////////////////////////////////////////////////////////

DllTest::DllTest()
{

}

DllTest::~DllTest()
{

}
把 MakeDll.dll 拷贝到 DllTest 文件夹下 

编译运行

结果 13 over