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.
模拟器是无法获取的~~~
#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; }
输出结果
2011-03-04 15:32:00.669 ShowSSID[4857:307] -[ShowSSIDAppDelegate fetchSSIDInfo]: Supported interfaces: ( en0 ) 2011-03-04 15:32:00.693 ShowSSID[4857:307] -[ShowSSIDAppDelegate fetchSSIDInfo]: en0 => { BSSID = "ca:fe:ca:fe:ca:fe"; SSID = XXXX; SSIDDATA = <01234567 01234567 01234567>; }