3winsock编程1

先看几个结构体定义

typedef struct WSAData {
  WORD wVersion;//版本号 通过MAKEWORD(2,2)返回该值 高位字节存储副版本号 第位字节存储主版本号
  WORD wHighVersion;//DLL可以支持的windows Socket规范的最高版本
  char szDescription[WSADESCRIPTION_LEN+1];//返回字符串 最多256字符
  char szSystemStatus[WSASYS_STATUS_LEN+1];//返回配置信息
  unsigned short iMaxSockets;
  unsigned short iMaxUdpDg;
  char FAR* lpVendorInfo;
} WSADATA, 
 *LPWSADATA;

 #include <winsock2.h>
 #pragma comment(lib, "ws2_32.lib")
 #include <stdio.h>
 int main(void)
 {
     WSADATA wsaData;

     // Initialize Winsock version 2.2
     //成功返回0
     if (( WSAStartup(MAKEWORD(, ), &wsaData)) != )//调用WSAStartup初始化
     {
         // NOTE: Since Winsock failed to load we cannot use
         // WSAGetLastError to determine the specific error for
         // why it failed. Instead we can rely on the return
         // status of WSAStartup.

         printf("WSAStartup无法初始化");
         return ;
     }

     // Setup Winsock communication code here
     //显示wsadata的数据
     printf("version:%d.%d\n", LOBYTE(wsaData.wVersion), HIBYTE(wsaData.wVersion));
     printf("High version: %d.%d\n", LOBYTE(wsaData.wHighVersion), HIBYTE(wsaData.wHighVersion));
     printf("Desription:%s\n", wsaData.szDescription);
     printf("System Status:%s", wsaData.szSystemStatus);
     // When your application is finished call WSACleanup
     if (WSACleanup() == SOCKET_ERROR)
     {
         printf("WSACleanup出错%d", WSAGetLastError());//返回错误代码
         printf("\n\n");
         system("pause");

     }
     getchar();

 }

注意：引入静态库哦