iphone中扫描wifi热点

最近项目中需要扫描环境周围中的wifi信息，查了一些资料，扫描wifi信息的api是苹果公司的私有api，使用这些api可能导致应用不能上app store或者ios版本升级过程中，可能对私有api不兼容。

关于扫描wifi信息的参考资料：http://code.google.com/p/uwecaugmentedrealityproject/和http://code.google.com/p/iphone-wireless/

下面是我在3gs ios 4.0上测试的结果：

2010-12-26 12:32:58.819 iphone.wifiii[538:307] Scanning WiFi Channels… 
2010-12-26 12:32:59.695 iphone.wifiii[538:307] ===–====== 
( 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "0:21:29:9d:79:d6"; 
        CAPABILITIES = 1041; 
        CHANNEL = 6; 
        "CHANNEL_FLAGS" = 8; 
        IE = <30140100 000fac04 0100000f ac040100 000fac02 0000>; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            18, 
            24, 
            36, 
            54, 
            6, 
            9, 
            12, 
            48 
        ); 
        "RSN_IE" =         { 
            "IE_KEY_RSN_AUTHSELS" =             ( 
                2 
            ); 
            "IE_KEY_RSN_MCIPHER" = 4; 
            "IE_KEY_RSN_UCIPHERS" =             ( 
                4 
            ); 
            "IE_KEY_RSN_VERSION" = 1; 
        }; 
        RSSI = "-91"; 
        SSID = <6c696e6b 737973>; 
        "SSID_STR" = linksys; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "0:23:cd:2f:90:fa"; 
        CAPABILITIES = 1073; 
        CHANNEL = 6; 
        "CHANNEL_FLAGS" = 8; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            6, 
            12, 
            24, 
            36, 
            9, 
            18, 
            48, 
            54 
        ); 
        RSSI = "-88"; 
        SSID = <62656964 6f756172 74>; 
        "SSID_STR" = beidouart; 
        WEP = 1; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "1c:bd:b9:d0:8b:f"; 
        CAPABILITIES = 1041; 
        CHANNEL = 1; 
        "CHANNEL_FLAGS" = 8; 
        IE = <dd180050 f2010100 0050f202 01000050 f2020100 0050f202 0c00>; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            18, 
            24, 
            36, 
            54, 
            6, 
            9, 
            12, 
            48 
        ); 
        RSSI = "-88"; 
        SSID = <4368696e 614e6574 2d526d66 5a>; 
        "SSID_STR" = "ChinaNet-RmfZ"; 
        "WPA_IE" =         { 
            "IE_KEY_WPA_AUTHSELS" =             ( 
                2 
            ); 
            "IE_KEY_WPA_MCIPHER" = 2; 
            "IE_KEY_WPA_UCIPHERS" =             ( 
                2 
            ); 
            "IE_KEY_WPA_VERSION" = 1; 
        }; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "94:c:6d:66:8:84"; 
        CAPABILITIES = 1073; 
        CHANNEL = 7; 
        "CHANNEL_FLAGS" = 8; 
        IE = <30140100 000fac04 0100000f ac040100 000fac02 0100dd16 0050f201 01000050 f2040100 0050f204 01000050 f202>; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            6, 
            12, 
            24, 
            36, 
            9, 
            18, 
            48, 
            54 
        ); 
        "RSN_IE" =         { 
            "IE_KEY_RSN_AUTHSELS" =             ( 
                2 
            ); 
            "IE_KEY_RSN_CAPS" =             { 
                "GTKSA_REPLAY_COUNTERS" = 1; 
                "NO_PAIRWISE" = 0; 
                "PRE_AUTH" = 1; 
                "PTKSA_REPLAY_COUNTERS" = 1; 
            }; 
            "IE_KEY_RSN_MCIPHER" = 4; 
            "IE_KEY_RSN_UCIPHERS" =             ( 
                4 
            ); 
            "IE_KEY_RSN_VERSION" = 1; 
        }; 
        RSSI = "-73"; 
        SSID = <4850542d 54502d4c 494e4b5f 36363038 3834>; 
        "SSID_STR" = "HPT-TP-LINK_660884"; 
        "WPA_IE" =         { 
            "IE_KEY_WPA_AUTHSELS" =             ( 
                2 
            ); 
            "IE_KEY_WPA_MCIPHER" = 4; 
            "IE_KEY_WPA_UCIPHERS" =             ( 
                4 
            ); 
            "IE_KEY_WPA_VERSION" = 1; 
        }; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "0:22:b0:b:a4:8f"; 
        CAPABILITIES = 1041; 
        CHANNEL = 11; 
        "CHANNEL_FLAGS" = 8; 
        IE = <dd180050 f2010100 0050f202 01000050 f2020100 0050f202 0000>; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            18, 
            24, 
            36, 
            54, 
            6, 
            9, 
            12, 
            48 
        ); 
        RSSI = "-73"; 
        SSID = <4368696e 614e6574 2d565350 57454233>; 
        "SSID_STR" = "ChinaNet-VSPWEB3"; 
        "WPA_IE" =         { 
            "IE_KEY_WPA_AUTHSELS" =             ( 
                2 
            ); 
            "IE_KEY_WPA_MCIPHER" = 2; 
            "IE_KEY_WPA_UCIPHERS" =             ( 
                2 
            ); 
            "IE_KEY_WPA_VERSION" = 1; 
        }; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "8:10:74:62:7f:4"; 
        CAPABILITIES = 1041; 
        CHANNEL = 3; 
        "CHANNEL_FLAGS" = 8; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            6, 
            9, 
            12, 
            18, 
            24, 
            36, 
            48, 
            54 
        ); 
        RSSI = "-63"; 
        SSID = <56535020 57454220 33>; 
        "SSID_STR" = "VSP WEB 3"; 
        WEP = 1; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "0:24:1:d0:23:f2"; 
        CAPABILITIES = 1073; 
        CHANNEL = 1; 
        "CHANNEL_FLAGS" = 8; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            6, 
            9, 
            12, 
            18, 
            24, 
            36, 
            48, 
            54 
        ); 
        RSSI = "-60"; 
        SSID = <56535020 57454220 32>; 
        "SSID_STR" = "VSP WEB 2"; 
        WEP = 1; 
    }, 
        { 
        AGE = 0; 
        "AP_MODE" = 2; 
        "BEACON_INT" = 10; 
        BSSID = "0:19:e0:ae:2b:80"; 
        CAPABILITIES = 1073; 
        CHANNEL = 6; 
        "CHANNEL_FLAGS" = 8; 
        NOISE = 0; 
        RATES =         ( 
            1, 
            2, 
            5, 
            11, 
            6, 
            12, 
            24, 
            36, 
            9, 
            18, 
            48, 
            54 
        ); 
        RSSI = "-57"; 
        SSID = <56535020 574542>; 
        "SSID_STR" = "VSP WEB"; 
        WEP = 1; 
    } 
) 
2010-12-26 12:32:59.724 iphone.wifiii[538:307] Scanning WiFi Channels Finished. 
2010-12-26 12:32:59.729 iphone.wifiii[538:307] —–wifi description———- 
Networks State: 
VSP WEB 3 (MAC: 8:10:74:62:7f:4), RSSI: -63, Channel: 3 
VSP WEB 2 (MAC: 0:24:1:d0:23:f2), RSSI: -60, Channel: 1 
ChinaNet-RmfZ (MAC: 1c:bd:b9:d0:8b:f), RSSI: -88, Channel: 1 
beidouart (MAC: 0:23:cd:2f:90:fa), RSSI: -88, Channel: 6 
ChinaNet-VSPWEB3 (MAC: 0:22:b0:b:a4:8f), RSSI: -73, Channel: 11 
linksys (MAC: 0:21:29:9d:79:d6), RSSI: -91, Channel: 6 
HPT-TP-LINK_660884 (MAC: 94:c:6d:66:8:84), RSSI: -73, Channel: 7 
VSP WEB (MAC: 0:19:e0:ae:2b:80), RSSI: -57, Channel: 6 
2010-12-26 12:32:59.735 iphone.wifiii[538:307] —-wifi size —— 
8 
2010-12-26 12:32:59.739 iphone.wifiii[538:307] ====

正好和我当时的环境的wifi信息一致。

下面是代码实现：

#import <Foundation/Foundation.h> 
#import <CoreFoundation/CoreFoundation.h> 
#include <dlfcn.h> 
@interface SOLStumbler : NSObject { 
    NSMutableDictionary *networks; //Key: MAC Address (BSSID) 
    void *libHandle; 
    void *airportHandle;    
    int (*apple80211Open)(void *); 
    int (*apple80211Bind)(void *, NSString *); 
    int (*apple80211Close)(void *); 
    int (*associate)(void *, NSDictionary*, NSString*); 
    int (*apple80211Scan)(void *, NSArray **, void *); 
} 
- (NSDictionary *)networks;                                                             //returns all 802.11 scanned network(s) 
- (NSDictionary *)network:(NSString *) BSSID;                   //return specific 802.11 network by BSSID (MAC Address) 
- (void)scanNetworks; 
- (int)numberOfNetworks; 
@end

方法具体实现：

#import "SOLStumbler.h" 
@implementation SOLStumbler 
- (id)init 
{ 
    self = [super init]; 
    networks = [[NSMutableDictionary alloc] init]; 
    libHandle = dlopen("/System/Library/SystemConfiguration/WiFiManager.bundle/WiFiManager", RTLD_LAZY); 
    char *error; 
    if (libHandle == NULL && (error = dlerror()) != NULL)  { 
        NSLog(@"%c",error); 
        exit(1); 
    } 
    apple80211Open = dlsym(libHandle, "Apple80211Open"); 
    apple80211Bind = dlsym(libHandle, "Apple80211BindToInterface"); 
    apple80211Close = dlsym(libHandle, "Apple80211Close"); 
    apple80211Scan = dlsym(libHandle, "Apple80211Scan"); 
    apple80211Open(&airportHandle); 
    apple80211Bind(airportHandle, @"en0"); 
    return self; 
}
- (NSDictionary *)network:(NSString *) BSSID 
{ 
    return [networks objectForKey:@"BSSID"]; 
}
- (NSDictionary *)networks 
{ 
    return networks; 
}
- (void)scanNetworks 
{ 
    NSLog(@"Scanning WiFi Channels…"); 
    NSDictionary *parameters = [[NSDictionary alloc] init]; 
    NSArray *scan_networks; //is a CFArrayRef of CFDictionaryRef(s) containing key/value data on each discovered network 
    apple80211Scan(airportHandle, &scan_networks, parameters); 
    NSLog(@"===–======\n%@",scan_networks); 
    for (int i = 0; i < [scan_networks count]; i++) { 
        [networks setObject:[scan_networks objectAtIndex: i] forKey:[[scan_networks objectAtIndex: i] objectForKey:@"BSSID"]]; 
    } 
    NSLog(@"Scanning WiFi Channels Finished.");     
}
- (int)numberOfNetworks 
{ 
    return [networks count]; 
}
- ( NSString * ) description { 
    NSMutableString *result = [[NSMutableString alloc] initWithString:@"Networks State: \n"]; 
    for (id key in networks){ 
        [result appendString:[NSString stringWithFormat:@"%@ (MAC: %@), RSSI: %@, Channel: %@ \n", 
                              [[networks objectForKey: key] objectForKey:@"SSID_STR"], //Station Name 
                              key, //Station BBSID (MAC Address) 
                              [[networks objectForKey: key] objectForKey:@"RSSI"], //Signal Strength
                              [[networks objectForKey: key] objectForKey:@"CHANNEL"]  //Operating Channel 
                              ]]; 
    } 
    return [NSString stringWithString:result]; 
}
- (void) dealloc { 
    apple80211Close(airportHandle); 
    [super dealloc]; 
} 
@end

类的调用：

NSLog(@"——–"); 
SOLStumbler *networksManager = [[SOLStumbler alloc] init]; 
[networksManager scanNetworks]; 
NSLog(@"—–wifi description———-\n%@",[networksManager description]); 
NSLog(@"—-wifi size ——\n%d",[networksManager numberOfNetworks]); 
NSLog(@"====");

源代码：http://easymorse-iphone.googlecode.com/svn/trunk/iphone.wifiii/