VC++6.0使用缺失的库文件

由于SDK版本过于陈旧，VC++6.0很多库文件没有，需要到VS2008或2010

中找，但是如果一定要使用VC6来编程的话有一个很好的解决办法，就是使用

动态链接库。具体步骤：

1、在VS环境中将需要使用的库函数先前调用，然后编译成DLL文件。

2、在VC中动态链接就可以了。

 

用个例子来说明，假设我们要使用两个数加法函数，而VC6中没有实现这一函

数的库文件，那么现在VS中写一个加法的导出函数，再在VC中调用这个导出函数

一、DLL文件的生成

建立一个WIN32的DLL工程取名为Win32DLL，包含所需库文件，导出函数如下：

stafx.h文件如下（系统自动生成）

// stdafx.h : include file for standard system include files,
//  or project specific include files that are used frequently, but
//      are changed infrequently
//

#if !defined(AFX_STDAFX_H__7A23F8E0_37A1_44C5_9FE5_91B46C430BF3__INCLUDED_)
#define AFX_STDAFX_H__7A23F8E0_37A1_44C5_9FE5_91B46C430BF3__INCLUDED_

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


// Insert your headers here
#define WIN32_LEAN_AND_MEAN		// Exclude rarely-used stuff from Windows headers

#include <windows.h>

// TODO: reference additional headers your program requires here

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_STDAFX_H__7A23F8E0_37A1_44C5_9FE5_91B46C430BF3__INCLUDED_)

stafx.cpp（系统自动生成）

// stdafx.cpp : source file that includes just the standard includes
//	Win32Dll.pch will be the pre-compiled header
//	stdafx.obj will contain the pre-compiled type information

#include "stdafx.h"

// TODO: reference any additional headers you need in STDAFX.H
// and not in this file

Win32Dll.h

// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the WIN32DLL_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// WIN32DLL_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef WIN32DLL_EXPORTS
#define WIN32DLL_API __declspec(dllexport)
#else
#define WIN32DLL_API __declspec(dllimport)
#endif

extern "C" WIN32DLL_API int add(int a, int b);

Win32Dll.cpp

// Win32Dll.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "Win32Dll.h"

WIN32DLL_API int add(int a, int b)
{//此处可以添加所需的库函数

	return a+b;
}

注意在函数申明前一定要加extern “C” 使其能在C++程序中调用

这样就可以使用下面的方法调用函数了

#include <iostream.h>
#include <stdio.h>
#include <windows.h>

int main()
{
	typedef int(addFunc)(int a, int b);
	addFunc *pAdd = 0;

	//加载dll
	HINSTANCE hDLLDrv;
	hDLLDrv = LoadLibrary("Win32Dll.dll");

	//获取函数的指针
	if(hDLLDrv)
	{
		pAdd = (addFunc *)GetProcAddress(hDLLDrv, "add");
	}

	if(pAdd!=NULL)
	{
		cout<<pAdd(1,2)<<endl;
	}

	FreeLibrary(hDLLDrv);
	return 0;
}