iPhone怎样获取SSID？

Question

我有个商业APP，完全有正当理由获取它所链接到的网络的SSID：如果它是链接到第三方硬件的Adhoc网络，就需要以不同与链接到因特网的方式发挥功能
我所看到的关于SSID的东西都说需要使用Apple80211，我理解的是一个私有的库。但我还了解到如果使用私有库的将导致苹果不会批准该程序。
我正在纠结于苹果和艰难的现实，还是我错过什么？

原问题:iPhone get SSID without private library

Answer 1

Jeremy W. Sherman
在iOS 4.1+,你可以这样做：

#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];
}

示例输出:

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>;
}

注意没有if是可以再模拟器上支持的，得在设备上测试。
在4.1之前, 你可能通过系统配置字典幸运的探索，例如，在我的Mac上使用scutil。

$ scutil
> show State:/Network/Interface/en1/AirPort
<dictionary> {
  Power Status : 1
  SecureIBSSEnabled : FALSE
  BSSID : <data> 0xcafecafecafe
  SSID_STR : XXXX
  SSID : <data> 0x012345670123456701234567
  Busy : FALSE
  CHANNEL : <dictionary> {
    CHANNEL : 1
    CHANNEL_FLAGS : 10
  }
}
> exit

---

esad
这是整理后的ARC版本，是基于elsurudo的代码的基础上的：

- (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;
}

---

Chris
这在我的设备（不是模拟器）上有效。确保你添加systemconfiguration框架。

#import <SystemConfiguration/CaptiveNetwork.h>

+ (NSString *)currentWifiSSID {
    // Does not work on the simulator.
    NSString *ssid = nil;
    NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
    for (NSString *ifnam in ifs) {
        NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
        if (info[@"SSID"]) {
            ssid = info[@"SSID"];
        }
    }
    return ssid;
}

---

onnoweb
看看CaptiveNetwork的 CNCopyCurrentNetworkInfo。
http://developer.apple.com/library/ios/#documentation/SystemConfiguration/Reference/CaptiveNetworkRef/Reference/reference.html.

---

user177352
这段代码可以获取SSID：

#import <SystemConfiguration/CaptiveNetwork.h>

@implementation IODAppDelegate

@synthesize window = _window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{


CFArrayRef myArray = CNCopySupportedInterfaces();
CFDictionaryRef myDict = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));
NSLog(@"Connected at:%@",myDict);
NSDictionary *myDictionary = (__bridge_transfer NSDictionary*)myDict;
NSString * BSSID = [myDictionary objectForKey:@"BSSID"];
NSLog(@"bssid is %@",BSSID);
// Override point for customization after application launch.
return YES;
}

这是结果：

Connected at:{
BSSID = 0;
SSID = "Eqra'aOrange";
SSIDDATA = <45717261 27614f72 616e6765>;
}