iOS开发中WiFi相关功能总结

1.获取WiFi信息

以前物联网刚火的时候，出现过很多一体式无线路由，所以App里难免会遇到要判断当前所连接的WiFi，以及获取WiFi信息的功能。13年的时候查过一些关于WiFi的方法，后面渐渐都忘记了。惭愧！！！

需要添加SystemConfiguration.framework并在当前类中添加代码#import<SystemConfiguration/CaptiveNetwork.h>

//获取WiFi 信息，返回的字典中包含了WiFi的名称、路由器的Mac地址、还有一个Data(转换成字符串打印出来是wifi名称)

- (NSDictionary *)fetchSSIDInfo {

NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();

if (!ifs) {

return nil;

}

NSDictionary *info = nil;

for (NSString *ifnam in ifs) {

info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);

if (info && [info count]) { break; }

}

return info;

}

//打印出来的结果：

2016-05-12 15:28:51.674 SimplePing[18883:6790207] WIFI_INFO:{

BSSID = "a4:2b:8c:c:7f:bd";

SSID = bdmy06;

SSIDDATA = <73756e65 65653036>;

}

2.获取WiFi名称

NSString *WiFiName = info[@"SSID"];

//打印结果：

2016-05-12 15:35:13.059 SimplePing[18887:6791418] bdmy06

完整的：

- (NSString *)fetchWiFiName {

NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();

if (!ifs) {

return nil;

}

NSString *WiFiName = nil;

for (NSString *ifnam in ifs) {

NSDictionary *info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);

if (info && [info count]) {

// 这里其实对应的有三个key:kCNNetworkInfoKeySSID、kCNNetworkInfoKeyBSSID、kCNNetworkInfoKeySSIDData，

// 不过它们都是CFStringRef类型的

WiFiName = [info objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];

//            WiFiName = [info objectForKey:@"SSID"];

break;

}

}

return WiFiName;

}

3.获取当前所连接WiFi的网关地址

#import<arpa/inet.h>

#import<netinet/in.h>

#import<ifaddrs.h>

获取网关的方法:

- (NSString *)getGatewayIpForCurrentWiFi {

NSString *address = @"error";

struct ifaddrs *interfaces = NULL;

struct ifaddrs *temp_addr = NULL;

int success = 0;

// retrieve the current interfaces - returns 0 on success

success = getifaddrs(&interfaces);

if (success == 0) {

// Loop through linked list of interfaces

temp_addr = interfaces;

//*/

while(temp_addr != NULL) {

/*/

int i=255;

while((i--)>0)

if(temp_addr->ifa_addr->sa_family == AF_INET) {

// Check if interface is en0 which is the wifi connection on the iPhone

if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])

{

// Get NSString from C String //ifa_addr

//ifa->ifa_dstaddr is the broadcast address, which explains the "255's"

//                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)];

address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

//routerIP----192.168.1.255 广播地址

NSLog(@"broadcast address--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)]);

//--192.168.1.106 本机地址

NSLog(@"local device ip--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)]);

//--255.255.255.0 子网掩码地址

NSLog(@"netmask--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)]);

//--en0 端口地址

NSLog(@"interface--%@",[NSString stringWithUTF8String:temp_addr->ifa_name]);

}

}

temp_addr = temp_addr->ifa_next;

}

}

// Free memory

freeifaddrs(interfaces);

in_addr_t i = inet_addr([address cStringUsingEncoding:NSUTF8StringEncoding]);

in_addr_t* x = &i;

unsigned char *s = getdefaultgateway(x);

NSString *ip=[NSString stringWithFormat:@"%d.%d.%d.%d",s[0],s[1],s[2],s[3]];

free(s);

return ip;

}

4.获取本机在WiFi环境下的IP地址

- (NSString *)getLocalIPAddressForCurrentWiFi

{

NSString *address = nil;

struct ifaddrs *interfaces = NULL;

struct ifaddrs *temp_addr = NULL;

int success = 0;

// retrieve the current interfaces - returns 0 on success

success = getifaddrs(&interfaces);

if (success == 0) {

// Loop through linked list of interfaces

temp_addr = interfaces;

while(temp_addr != NULL) {

if(temp_addr->ifa_addr->sa_family == AF_INET) {

// Check if interface is en0 which is the wifi connection on the iPhone

if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {

address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

return address;

}

}

temp_addr = temp_addr->ifa_next;

}

freeifaddrs(interfaces);

}

return nil;

}