[C++]VC中先行編譯的標頭檔放那裡？

用C++寫程式，肯定要用先行編譯標頭檔，就是那個stdafx.h.
不過我一直以為只要在.cpp檔案中包含stdafx.h 就使用了先行編譯標頭檔，其實不對。

在VC++中，先行編譯標頭檔是指放到stdafx.h中的標頭檔才會有效果。
如下：

file: stdafx.h

// 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，要想使用先行編譯效果的標頭檔要放這裡。#include <Windows.h>#include "xxx.h"

// TODO: reference additional headers your program requires here

在stdafx.cpp中保持不變即可，預設如下：

// 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