iPhone,iPad如何获取WIFI名称即SSID

2013-03-05 21:57  1586人阅读  评论(0)  收藏  举报

iphone ipad wifi

2010年开始苹果清理了一批APP Store上的WIFI扫描软件, 缘由语焉不详.

这些WIFI扫描软件使用了苹果的私有函数apple80211.framework

尽管不能合法(指能通过App Store的审核)的获取WIFI列表, 不过我们还是可以获取到当前Wifi连接的信息,比如SSID.

SSID全称Service Set IDentifier, 即Wifi网络的公开名称.

苹果在IOS v4.1+版本上提供了公开的方法来获取该信息.

示范代码如下:

 #import <SystemConfiguration/CaptiveNetwork.h>

 - (id)fetchSSIDInfo
 {
     NSArray *ifs = (id)CNCopySupportedInterfaces();
     NSLog(@"%s: Supported interfaces: %@", __func__, ifs);
     id info = nil;
     for (NSString *ifnam in ifs) {
         info = (id)CNCopyCurrentNetworkInfo((CFStringRef)ifnam);
         NSLog(@"%s: %@ => %@", __func__, ifnam, info);
         if (info && [info count]) {
             break;
         }
         [info release];
     }
     [ifs release];
     return [info autorelease];
 }

对于ARC版本, 代码可简化如下:

 - (id)fetchSSIDInfo {
      NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
      NSLog(@"Supported interfaces: %@", ifs);
      id info = nil;
      for (NSString *ifnam in ifs) {
          info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
          NSLog(@"%@ => %@", ifnam, info);
          if (info && [info count]) { break; }
      }
      return info;
 }

参考链接:

1. http://stackoverflow.com/questions/5198716/iphone-get-ssid-without-private-library

2. http://answers.yahoo.com/question/index?qid=20100529040141AAKd8dO

by iefreer

扫描wifi信息： 

http://code.google.com/p/uwecaugmentedrealityproject/ 

http://code.google.com/p/iphone-wireless/