Initializing Winsock 初始化WinSock

最新推荐文章于 2023-02-17 11:14:25 发布

suncheng_hong

最新推荐文章于 2023-02-17 11:14:25 发布

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分类专栏： Windows网络编程文章标签： application socket struct

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本文介绍如何使用WinSock进行网络编程。主要内容包括WinSock的初始化过程与所需的数据结构WSAData，以及如何调用WSAStartup和WSACleanup函数来开始和结束WinSock的使用。提供了一个简单的WinSock初始化示例程序。

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初始化:

int WSAStartup(
WORD wVersionRequested,
LPWSADATA lpWSAData
);

lpWSAData指向：

typedef struct WSAData
{
    WORD           wVersion;
    WORD           wHighVersion;
    char           szDescription[WSADESCRIPTION_LEN + 1];
    char           szSystemStatus[WSASYS_STATUS_LEN + 1];
    unsigned short iMaxSockets;
    unsigned short iMaxUdpDg;
    char FAR *     lpVendorInfo;
} WSADATA, * LPWSADATA;

释放WinSockint WSACleanup(void);

简单的WinSock代码：

#include <winsock2.h>

void main(void)
{
   WSADATA wsaData;

   // Initialize Winsock version 2.2

   if ((Ret = WSAStartup(MAKEWORD(2,2), &wsaData)) != 0)
   {
      // 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 failed with error %d/n", Ret);
      return;
   }

   // Setup Winsock communication code here

   // When your application is finished call WSACleanup
   if (WSACleanup() == SOCKET_ERROR)
   {
      printf("WSACleanup failed with error %d/n", WSAGetLastError());
   }
}