获取设备的局域网IP

    // 获取手机的ip

    NSString *ip = [GJWIPHelperdeviceIPAdress];

// 获取IP的.h文件

#import <Foundation/Foundation.h>

@interface GJWIPHelper : 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 <ifaddrs.h>

#include <arpa/inet.h>

@implementation GJWIPHelper

+ (NSString *)deviceIPAdress {

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

    structifaddrs *interfaces = NULL;

    structifaddrs *temp_addr = NULL;

    int success =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 ([[NSStringstringWithUTF8String:temp_addr->ifa_name]isEqualToString:@"en0"]) {

                    // Get NSString from C String

                    address = [NSStringstringWithUTF8String:inet_ntoa(((structsockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            

            temp_addr = temp_addr->ifa_next;

        }

    }

    freeifaddrs(interfaces);

    return address;

}

@end