获取iPhone设备的IP的地址

1.添加系统头文件”ifaddrs.h”,  ”arpa/inet.h”

2.函数

- (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 ofinterfaces
        temp_addr = interfaces;
        while(temp_addr != NULL) {
           if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0which is the wifi connection on the iPhone
                if([[NSStringstringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]){
                    // Get NSString from CString
                    address = [NSStringstringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];              
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    // Free memory
    freeifaddrs(interfaces);
    return address;
}