C程序：获取本机IP地址

最新推荐文章于 2025-02-18 00:15:00 发布

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此博客展示了一段C语言代码，实现了获取主机名和IP地址的功能。代码中进行了socket初始化，调用gethostname函数获取主机名，若失败则输出错误信息；接着使用gethostbyname函数获取主机IP地址，若失败也会输出错误信息。

// louis 2004-7-27

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
int ret;
char buf[1024];
WORD wVersionRequested;
WSADATA wsaData;
int err;

struct hostent *host;

// socket initialize
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return -1;
}

memset(buf, 0, 1024);

// get hostname
ret = gethostname(buf, 1024);
if(ret != 0)
{
  printf("return is %d/n", ret);
  ret = WSAGetLastError();
  printf("specific error is %d/n", ret);
  printf("gethostname error./n");
}else
  printf("hostname is %s/n", buf);

// get host ip address
host = gethostbyname(buf);
if(host == NULL)
{
  perror("gethostbyname");
  return -1;
}else
  //printf("ip address is %s/n", inet_ntoa(*(host->h_addr_list)));
  printf("ip address is %s/n", inet_ntoa(*(in_addr *)host->h_addr_list[0]));

return 0;
}