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;
}
