IOS开发之WIFI及IP相关

获取手机设备的IP信息：

#import <ifaddrs.h>

#import <arpa/inet.h>

// Get IP Address

- (NSString *)getIPAddress {

NSString *address = @"error";

struct ifaddrs *interfaces = NULL;

struct ifaddrs *temp_addr = NULL;

int success = 0;

// retrieve the current interfaces - returns 0 on success

success = getifaddrs(&interfaces);

if (success == 0) {

// Loop through linked list of interfaces

temp_addr = interfaces;

while(temp_addr != NULL) {

if(temp_addr->ifa_addr->sa_family == AF_INET) {

// Check if interface is en0 which is the wifi connection on the iPhone

if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {

// Get NSString from C String

address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

}

}

temp_addr = temp_addr->ifa_next;

}

}

// Free memory

freeifaddrs(interfaces);

return address;

}

//  Get SSID

#import <SystemConfiguration/CaptiveNetwork.h>

- (NSString *)currentWifiSSID

{

NSString *ssid = nil;

NSArray *ifs = (__bridge   id)CNCopySupportedInterfaces();

for (NSString *ifname in ifs) {

NSDictionary *info = (__bridge id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifname);

if (info[@"SSID"])

{

ssid = info[@"SSID"];

}

}

return ssid;

}

#import <sys/socket.h>

#import <sys/sockio.h>

#import <sys/ioctl.h>

#import <net/if.h>

#import <arpa/inet.h>

- (NSString *)getDeviceIPIpAddresses

{

int sockfd = socket(AF_INET, SOCK_DGRAM, 0);

if ( sockfd < 0) return nil;

NSMutableArray *ips = [NSMutableArray array];

int BUFFERSIZE = 4096;

struct ifconf ifc;

char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;

struct ifreq *ifr, ifrcopy;

ifc.ifc_len = BUFFERSIZE;

ifc.ifc_buf = buffer;

if (ioctl(sockfd, SIOCGIFCONF, &ifc) >= 0){

for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){

ifr = (struct ifreq *)ptr;

int len = sizeof(struct sockaddr);

if (ifr->ifr_addr.sa_len > len) {

len = ifr->ifr_addr.sa_len;

}

ptr += sizeof(ifr->ifr_name) + len;

if (ifr->ifr_addr.sa_family != AF_INET) continue;

if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL) *cptr = 0;

if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) continue;

memcpy(lastname, ifr->ifr_name, IFNAMSIZ);

ifrcopy = *ifr;

ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);

if ((ifrcopy.ifr_flags & IFF_UP) == 0) continue;

NSString *ip = [NSString  stringWithFormat:@"%s", inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];

[ips addObject:ip];

}

}

close(sockfd);

NSString *deviceIP = @"";

for (int i=0; i < ips.count; i++)

{

if (ips.count > 0)

{

deviceIP = [NSString stringWithFormat:@"%@",ips.lastObject];

}

}

return deviceIP;

}