boost asio中 error C1189: #error : WinSock.h has already been included 的问题

http://blog.163.com/tsing_best/blog/static/111153022011111251020176/

 

现象

在这样的情况下，

#include <Windows.h>

#include <boost/asio.hpp>

编译器会报错，fatal error C1189:   #error :  WinSock.h has already been included

解决办法

#define WIN32_LEAN_AND_MEAN      // 在#include<windows.h>前定义

#include <windows.h>