Precautions established under Win Socket

Under Windows socket established

1. First of all windows to be introduced under the header file windows.h and WinSock2.h

   (Note: Since the early windows.h socket1 which contains several versions, when the code is under the execution of this command, it displays the error of the duplicate)

   #include<windows.h>
   #include<WinSock2.h>
   
   int main(){
       return 0;
   }

   To solve this problem, Microsoft proposed two solutions.

   • The header file references WinSock2.h placed before pretreatment windows.h
   • Added before pre-header file #define WIN32_LEAN_AND_MEAN

2. WORD ver = MAKEWORD(2, 2);//版本号
   WSADATA dat;//一个数据指针
   WSAStartup(ver, &dat);//函数有2个参数，一个版本号，一个数据指针
   //           ↓
   //连接socket和其他系统基本一样
   //           ↑
   WSACleanup();