linux下程式設計-IP擷取與設定

//擷取本機IP地址函數

QString GetLocalIp()<br />{ </p><p> int sock_get_ip;<br /> char ipaddr[50]; </p><p> struct sockaddr_in *sin;<br /> struct ifreq ifr_ip; </p><p> if ((sock_get_ip=socket(AF_INET, SOCK_STREAM, 0)) == -1)<br /> {<br /> printf("socket create failse...GetLocalIp!/n");<br /> return "";<br /> } </p><p> memset(&ifr_ip, 0, sizeof(ifr_ip));<br /> strncpy(ifr_ip.ifr_name, "eth0", sizeof(ifr_ip.ifr_name) - 1); </p><p> if( ioctl( sock_get_ip, SIOCGIFADDR, &ifr_ip) < 0 )<br /> {<br /> return "";<br /> }<br /> sin = (struct sockaddr_in *)&ifr_ip.ifr_addr;<br /> strcpy(ipaddr,inet_ntoa(sin->sin_addr)); </p><p> printf("local ip:%s /n",ipaddr);<br /> close( sock_get_ip ); </p><p> return QString( ipaddr );<br />}   

//修改本機IP地址的函數

int SetLocalIp( const char *ipaddr )<br />{ </p><p> int sock_set_ip; </p><p> struct sockaddr_in sin_set_ip;<br /> struct ifreq ifr_set_ip; </p><p> bzero( &ifr_set_ip,sizeof(ifr_set_ip)); </p><p> if( ipaddr == NULL )<br /> return -1; </p><p> if(sock_set_ip = socket( AF_INET, SOCK_STREAM, 0 ) == -1);<br /> {<br /> perror("socket create failse...SetLocalIp!/n");<br /> return -1;<br /> } </p><p> memset( &sin_set_ip, 0, sizeof(sin_set_ip));<br /> strncpy(ifr_set_ip.ifr_name, "eth0", sizeof(ifr_set_ip.ifr_name)-1); </p><p> sin_set_ip.sin_family = AF_INET;<br /> sin_set_ip.sin_addr.s_addr = inet_addr(ipaddr);<br /> memcpy( &ifr_set_ip.ifr_addr, &sin_set_ip, sizeof(sin_set_ip)); </p><p> if( ioctl( sock_set_ip, SIOCSIFADDR, &ifr_set_ip) < 0 )<br /> {<br /> perror( "Not setup interface/n");<br /> return -1;<br /> } </p><p> //設定啟用標誌<br /> ifr_set_ip.ifr_flags |= IFF_UP |IFF_RUNNING; </p><p> //get the status of the device<br /> if( ioctl( sock_set_ip, SIOCSIFFLAGS, &ifr_set_ip ) < 0 )<br /> {<br /> perror("SIOCSIFFLAGS");<br /> return -1;<br /> } </p><p> close( sock_set_ip );<br /> return 0;<br />}  

 

本文來自CSDN部落格，轉載請標明出處：http://blog.csdn.net/davidge333/archive/2010/01/24/5250566.aspx