如何在同一个wifi中获取其他设备的主机名？ [英] How to get the other devices' host name in the same wifi?

问题描述

我找到了一些可以扫描本地网络并列出所有设备信息的iOS应用。

I found some iOS app which could scan the local network and list all the device information.

我不知道如何。

图片：

推荐答案

第1步 - 凝胶本地IP

适用于iOS 7及更低版本

Step 1 - Gel local IP

For iOS 7 and lower

#include <ifaddrs.h>
#include <arpa/inet.h>

- (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;

} 

iOS 8

[[NSHost currentHost] address]

第2步 - 获取在线IP

https：// github。 com / tonymillion / Reachability

使用可达性，您可以获得子网IP的可达性。

Step 2 - Get online IPs

https://github.com/tonymillion/Reachability
Using Reachability, you can get subnet IP's reachability.

Reachability* reach = [Reachability reachabilityWithHostname:subnetIp];

第3步 - 解析主机名

Apple有一篇很棒的文章，涵盖了HostnameResolving主题。
https://developer.apple .com / library / ios / documentation / NetworkingInternet / Conceptual / NetworkingTopics / Articles / ResolvingDNSHostnames.html

您可以在iOS8中尝试更简单的变体

You can try also simpler variant in iOS8

[[NSHost hostWithAddress:@"173.194.34.24"] name]

示例项目

https://github.com/mongizaidi/LAN-Scan

这是一个小项目，它进行局域网扫描，你只需要解决主机名，你会得到你想要的结果。

Example project

https://github.com/mongizaidi/LAN-Scan
here is a small project, that does the Local Area Network scan, you need only to resolve the hostnames, and you will get result that you want.

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