iPhone,iPad如何获取WIFI名称即SSID

本文转载至 http://blog.csdn.net/wbw1985/article/details/20530281 

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

SSID全称Service Set IDentifier, 即Wifi网络的公开名称.在IOS 4.1以上版本提供了公开的方法来获取该信息.

#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);
        if (info && [info count]) {
            break;
        }
        [info release];
    }
    [ifs release];
    return [info autorelease];
}

- (NSString *)currentWifiSSID {
    // Does not work on the simulator.
    NSString *ssid = nil;
    NSArray *ifs = (  id)CNCopySupportedInterfaces();
    NSLog(@"ifs:%@",ifs);
    for (NSString *ifnam in ifs) {
        NSDictionary *info = (id)CNCopyCurrentNetworkInfo((CFStringRef)ifnam);
        NSLog(@"dici：%@",[info  allKeys]);
        if (info[@"SSIDD"]) {
            ssid = info[@"SSID"];

        }
    }
    return ssid;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    tempLabel=[[UILabel alloc]initWithFrame:CGRectMake(50, 40, 200, 40)];
    tempLabel.textAlignment=NSTextAlignmentCenter;
    [self.view addSubview:tempLabel];
    NSDictionary *ifs = [self fetchSSIDInfo];
    NSString *ssid = [[ifs objectForKey:@"SSID"] lowercaseString];
    tempLabel.text=ssid;

}

log 信息 ：

2013-06-05 21:39:14.357 wifiNameDemo[9877:707] dici：{
    BSSID = "f4:ec:38:40:cc:e8";
    SSID = "Nice_Apple";
    SSIDDATA = <4e696365 5f417070 6c65>;
}
2013-06-05 21:39:14.360 wifiNameDemo[9877:707] Nice_Apple

 ARC 版本：

- (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;
}

  效果如下：