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

巴特西

3winsock编程1

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