iOS 开发中WIFI相关功能总结

本文介绍iOS开发中如何进行网络检测,包括Ping命令的使用,并提供了详细的代码示例。此外,还介绍了如何获取WiFi的相关信息,如WiFi名称、网关地址、IP地址等。

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iOS 开发中难免会遇到很多与网络方面的判断,这里做个汇总,大多可能是与WiFi相关的。

1.Ping域名、Ping某IP

有时候可能会遇到ping 某个域名或者ip通不通,再做下一步操作。这里的ping与传统的做get或者post请求还是有很大区别的。比如我们连接了某个WiFi,测试ping www.baidu.com,如果能ping 通,基本可以断定可以上网了,但是如果我们做了一个get 请求(url 是www.baidu.com),路由器可能重定向这个WiFi内的某网页了,依然没有错误返回,就会误认为可以正常上网。

这里有关于ping命令的详细解释:百度百科ping

iOS中想要ping域名或者ip,苹果提供了一个官方例子:SimplePing

在例子中,有一个苹果已经封装过的类【SimplePing.h】和【SimplePing.m】

使用起来也相当的简单:

a.首先创建一个Ping对象:
 SimplePing *pinger = [[SimplePing alloc] initWithHostName:self.hostName];

 self.pinger = pinger;

 pinger.delegate = self;

 pinger.addressStyle = SimplePingAddressStyleICMPv4;

 [pinger start];
b.然后在start成功的代理方法中,发送数据报文:
/**

 *  start成功,也就是准备工作做完后的回调

 */

- (void)simplePing:(SimplePing *)pinger didStartWithAddress:(NSData *)address

{

    // 发送测试报文数据

    [self.pinger sendPingWithData:nil];

}

- (void)simplePing:(SimplePing *)pinger didFailWithError:(NSError *)error

{

    NSLog(@"didFailWithError");

    [self.pinger stop];

}
c.其他几个代理方法也非常简单,就简单记录一下:
// 发送测试报文成功的回调方法

- (void)simplePing:(SimplePing *)pinger didSendPacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber

{

    NSLog(@"#%u sent", sequenceNumber);

}

//发送测试报文失败的回调方法

- (void)simplePing:(SimplePing *)pinger didFailToSendPacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber error:(NSError *)error

{

    NSLog(@"#%u send failed: %@", sequenceNumber, error);

}

// 接收到ping的地址所返回的数据报文回调方法

- (void)simplePing:(SimplePing *)pinger didReceivePingResponsePacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber

{

    NSLog(@"#%u received, size=%zu", sequenceNumber, packet.length);

}

- (void)simplePing:(SimplePing *)pinger didReceiveUnexpectedPacket:(NSData *)packet

{

    NSLog(@"#%s",__func__);

}
*********注意点:

iOS 中 ping失败后(即发送测试报文成功后,一直没后收到响应的报文),不会有任何回调方法告知我们。而一般ping 一次的结果也不太准确,ping 花费的时间也非常短,所以我们一般会ping多次,发送一次ping 测试报文0.5s后检测一下这一次ping是否已经收到响应。0.5s后检测时,如果已经收到响应,则可以ping 通;如果没有收到响应,则视为超时。

做法也有很多种,可以用NSTimer或者 {- (void)performSelector: withObject:afterDelay:}

这里有一个别人写的工程:https://github.com/lovesunstar/STPingTest

PingTest效果图

终端ping效果图

2.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。

需要导入import SystemConfiguration.CaptiveNetwork

//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:

2017-03-02 15:28:51.674 SimplePing[18883:6790207] WIFI_INFO:{

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

    SSID = bdmy06;

    SSIDDATA = ;

}

3.获取WiFi名称

有了上一步,获取WiFi名称就非常简单了。


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

//打印结果:

2017-03-02 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;

}

4.获取当前所连接WiFi的网关地址

- (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;

}

5.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;

}

6.获取广播地址、子网掩码、端口等

- (NSMutableDictionary *)getLocalInfoForCurrentWiFi {

    NSMutableDictionary *dict = [NSMutableDictionary dictionary];

    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"]) {

                    //----192.168.1.255 广播地址

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

                    if (broadcast) {

                        [dict setObject:broadcast forKey:@"broadcast"];

                    }

                    NSLog(@"broadcast address--%@",broadcast);

                    //--192.168.1.106 本机地址

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

                    if (localIp) {

                        [dict setObject:localIp forKey:@"localIp"];

                    }

                    NSLog(@"local device ip--%@",localIp);

                    //--255.255.255.0 子网掩码地址

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

                    if (netmask) {

                        [dict setObject:netmask forKey:@"netmask"];

                    }

                    NSLog(@"netmask--%@",netmask);

                    //--en0 端口地址

                    NSString *interface = [NSString stringWithUTF8String:temp_addr->ifa_name];

                    if (interface) {

                        [dict setObject:interface forKey:@"interface"];

                    }

                    NSLog(@"interface--%@",interface);

                    return dict;

                }

            }

            temp_addr = temp_addr->ifa_next;

        }

    }

    // Free memory

    freeifaddrs(interfaces);

    return dict;

}

打印结果:

2017-03-02 17:59:09.257 SimplePing[19141:6830567] wifi:{

    broadcast = "192.168.1.255";

    interface = en0;

    localIp = "192.168.1.7";

    netmask = "255.255.255.0";

}
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