获取设备的局域网IP

//获取手机的ip

NSString*ip = [GJWIPHelper    deviceIPAdress];

//获取IP的.h文件

#import

@interfaceGJWIPHelper :NSObject

+ (NSString*)deviceIPAdress;//获取设备局域网中IP地址

@end

//获取IP的.m文件

#import"GJWIPHelper.h"

#include

#include  

@implementationGJWIPHelper

+ (NSString*)deviceIPAdress {

NSString   *address =@"an error occurred when obtaining ip address";

structifaddrs  *interfaces =NULL;

structifaddrs   *temp_addr =NULL;

intsuccess =0;

success =getifaddrs(&interfaces);

if(success ==0) {// 0表示获取成功

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->if  a_name]  isEqualToString:@"en0"]) {

// Get NSString from C String

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

}

}

temp_addr = temp_addr->ifa_next;

}

}

freeifaddrs(interfaces);

return   address;

}

@end

注：不喜勿喷！！！