iOS实现WIFI传书

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  • 问题

    业务场景上存在需要将手机里的文件、图片传递给其他的设备,

    不仅仅局限于传书、资料啥的都有可能传递

  • 方案

    最base的方法:设备之间加个云,设备上传资料到云,云同步资料到各个设备,适用于多设备之间,这个没讲的必要

    如果是两设备之间,忽略服务器,怎么搞?联想到图书App中的WiFi传书,貌似没云端概念的,怎么做到的?

  • 上菜

    • 采用框架GCDWebServer,通过CocoaPods引入
    pod "GCDWebServer", "~> 3.0"
    
    • 设置本地接收目录,初始化Server并启动
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if let filepath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first as NSString? {
            let path = filepath.appendingPathComponent("transfer")
            if !FileManager.default.fileExists(atPath: path) {
                do {
                    try FileManager.default.createDirectory(atPath: path, withIntermediateDirectories: false, attributes: nil)
                } catch {
                    print(error)
                }
            }
            
            webServer = GCDWebUploader(uploadDirectory: path)
            webServer?.delegate = self
            webServer?.allowHiddenItems = true
            webServer?.allowedFileExtensions = ["doc", "docx", "xls", "xlsx", "txt", "pdf", "jpeg", "jpg"]
            webServer?.title = "善斋工具"
            webServer?.prologue = "欢饮使用善斋工具的WIFI管理平台"
            webServer?.epilogue = "善斋书屋制作"
            
            if webServer?.start() == true, let address = IPHelper.deviceIPAdress(), address.count > 0, let port = webServer?.port {
                ipLb.text = "1.确保设备在同一局域网 \n2.上传时勿关闭该页面 \n3.请网页中输入该地址 \nhttp://\(address):\(port)/"
            } else {
                ipLb.text = "GCDWebServer not running!"
            }
        }
    }
    
    • 局域网内获取本机的ip地址,并设置其他设备访问链接
    #import <ifaddrs.h>
    #import <arpa/inet.h>
    #import <net/if.h>
    
    @implementation IPHelper
    
    + (NSString *)deviceIPAdress {
        NSString *address = @"";
        struct ifaddrs *interfaces = NULL;
        struct ifaddrs *temp_addr = NULL;
        int success = 0;
        success = getifaddrs(&interfaces);
        if (success == 0) { // 0 表示获取成功
            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"]) {
                        // Get NSString from C String
                        address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                    }
                }
                temp_addr = temp_addr->ifa_next;
            }
        }
        freeifaddrs(interfaces);
        return address;
        
    }
    
    
    #define IOS_CELLULAR    @"pdp_ip0"
    #define IOS_WIFI        @"en0"
    #define IOS_VPN         @"utun0"
    #define IP_ADDR_IPv4    @"ipv4"
    #define IP_ADDR_IPv6    @"ipv6"
    
    #pragma mark - 获取设备当前网络IP地址
    + (NSString *)getIPAddress:(BOOL)preferIPv4 {
        NSArray *searchArray = preferIPv4 ?
        @[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
        @[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;
        
        NSDictionary *addresses = [self getIPAddresses];
        NSLog(@"addresses: %@", addresses);
        
        __block NSString *address;
        [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
         {
             address = addresses[key];
             //筛选出IP地址格式
             if([self isValidatIP:address]) *stop = YES;
         } ];
        return address ? address : @"0.0.0.0";
    }
    
    + (BOOL)isValidatIP:(NSString *)ipAddress {
        if (ipAddress.length == 0) {
            return NO;
        }
        NSString *urlRegEx = @"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
        "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
        "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
        "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
        
        NSError *error;
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];
        
        if (regex != nil) {
            NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
            
            if (firstMatch) {
                NSRange resultRange = [firstMatch rangeAtIndex:0];
                NSString *result=[ipAddress substringWithRange:resultRange];
                //输出结果
                NSLog(@"%@",result);
                return YES;
            }
        }
        return NO;
    }
    
    + (NSDictionary *)getIPAddresses
    {
        NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];
        
        // retrieve the current interfaces - returns 0 on success
        struct ifaddrs *interfaces;
        if(!getifaddrs(&interfaces)) {
            // Loop through linked list of interfaces
            struct ifaddrs *interface;
            for(interface=interfaces; interface; interface=interface->ifa_next) {
                if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
                    continue; // deeply nested code harder to read
                }
                const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
                char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
                if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
                    NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
                    NSString *type;
                    if(addr->sin_family == AF_INET) {
                        if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                            type = IP_ADDR_IPv4;
                        }
                    } else {
                        const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
                        if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                            type = IP_ADDR_IPv6;
                        }
                    }
                    if(type) {
                        NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                        addresses[key] = [NSString stringWithUTF8String:addrBuf];
                    }
                }
            }
            // Free memory
            freeifaddrs(interfaces);
        }
        return [addresses count] ? addresses : nil;
    }
    
    
    • 在其他设备中访问该地址即可
    let address = IPHelper.deviceIPAdress()
    let port = webServer?.port
    http://\(address):\(port)/
    
    • 备注:
      • 确保设备在同一局域网
      • 上传时勿关闭该页面
  • Game Over

    局域网中,设备作为server,其他设备作为client,简单的HTTP方式上传文件到server,初始配置的路径即为server接收后存放文件的路径