浅谈VC中预编译的头文件放那里的问题分析

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
#ifndef _WIN32_WINNT        // Allow use of features specific to Windows XP or later.                  
#define _WIN32_WINNT 0x0501    // Change this to the appropriate value to target other versions of Windows.
#endif                       
#define WIN32_LEAN_AND_MEAN        // Exclude rarely-used stuff from Windows headers

// 各位注意，要想使用预编译效果的头文件要放这里。
#include <Windows.h>
#include "xxx.h"

// TODO: reference additional headers your program requires here

// stdafx.cpp : source file that includes just the standard includes
// CPPTestHelper.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