iPhone,iPad如何获取WIFI名称即SSID

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:

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#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:

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- (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.

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#import <SystemConfiguration/CaptiveNetwork.h>

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-(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 ：

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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：

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- (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：