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;

 1 #include <winsock2.h>
 2 #pragma comment(lib, "ws2_32.lib")
 3 #include <stdio.h>
 4 int main(void)
 5 {
 6     WSADATA wsaData;
 7 
 8     
 9 
10     // Initialize Winsock version 2.2
11     //成功返回0
12     if (( WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0)//调用WSAStartup初始化
13     {
14         // NOTE: Since Winsock failed to load we cannot use 
15         // WSAGetLastError to determine the specific error for
16         // why it failed. Instead we can rely on the return 
17         // status of WSAStartup.
18 
19         printf("WSAStartup无法初始化");
20         return 0;
21     }
22 
23     // Setup Winsock communication code here 
24     //显示wsadata的数据
25     printf("version:%d.%d
", LOBYTE(wsaData.wVersion), HIBYTE(wsaData.wVersion));
26     printf("High version: %d.%d
", LOBYTE(wsaData.wHighVersion), HIBYTE(wsaData.wHighVersion));
27     printf("Desription:%s
", wsaData.szDescription);
28     printf("System Status:%s", wsaData.szSystemStatus);
29     // When your application is finished call WSACleanup
30     if (WSACleanup() == SOCKET_ERROR)
31     {
32         printf("WSACleanup出错%d", WSAGetLastError());//返回错误代码
33         printf("

");
34         system("pause");
35         
36     }
37     getchar();
38 
39     
40 }

注意：引入静态库哦