winsock2.h(112) : error C2011: 'fd_set' : 'struct' type redefinition

winsock2.h(112) : error C2011: 'fd_set' : 'struct' type redefinition

 

<windows.h>中已经包含了早期版本的<winsock.h> (windows socket 1.1)

参照<stdafx.h>中的做法，在#include <windows.h> 前添加

#define  WIN32_LEAN_AND_MEAN

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

#include <windows.h>
#include <winsock2.h>

#include <ws2tcpip.h>
#pragma comment(lib,"ws2_32.lib")

或者颠倒两者的顺序

#include <winsock2.h>
#include <windows.h>

#include <ws2tcpip.h>
#pragma comment(lib,"ws2_32.lib")