iphone中扫描wifi热点

sdtf08

　　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/