//go:build windows // +build windows package localchat import ( "encoding/json" "log" "net" ) func SendBroadcast(message UdpMessage) error { broadcastAddr := GetBroadcastAddr() addr, err := net.ResolveUDPAddr("udp4", broadcastAddr) if err != nil { log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err) return err } // 使用本地地址进行连接 localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0") if err != nil { log.Printf("Failed to resolve local UDP address: %v", err) return err } conn, err := net.ListenUDP("udp4", localAddr) if err != nil { log.Printf("Failed to listen on UDP address %s: %v", broadcastAddr, err) return err } defer conn.Close() // 获取本地 IP 地址 localIP, err := GetLocalIP() log.Printf("本地 IP 地址: %s", localIP) if err != nil { log.Printf("Failed to get local IP address: %v", err) return err } message.IP = localIP data, err := json.Marshal(message) if err != nil { log.Printf("Failed to marshal JSON for %s: %v", broadcastAddr, err) return err } _, err = conn.WriteToUDP(data, addr) if err != nil { log.Printf("Failed to write to UDP address %s: %v", broadcastAddr, err) return err } log.Printf("发送消息到 %s 成功", broadcastAddr) return nil } // ListenForBroadcast 监听广播消息 func ListenForBroadcast() { // 使用本地地址监听 localAddr, err := net.ResolveUDPAddr("udp4", ":20249") if err != nil { log.Fatalf("Failed to resolve local UDP address: %v", err) } conn, err := net.ListenUDP("udp4", localAddr) if err != nil { log.Fatalf("Failed to listen on UDP address: %v", err) } defer conn.Close() // 获取本地 IP 地址 localIP, err := GetLocalIP() if err != nil { log.Printf("Failed to get local IP address: %v", err) } // 开始监听广播消息 buffer := make([]byte, 1024) for { n, remoteAddr, err := conn.ReadFromUDP(buffer) if err != nil { log.Printf("Error reading from UDP: %v", err) continue } var udpMsg UdpMessage err = json.Unmarshal(buffer[:n], &udpMsg) if err != nil { log.Printf("Error unmarshalling JSON: %v", err) continue } if udpMsg.IP == localIP { continue } OnlineUsers[udpMsg.IP] = udpMsg if udpMsg.Type == "file" { RecieveFile(udpMsg) } log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname) } } func GetBroadcastAddr() string { //return libs.GetUdpAddr() return "255.255.255.255:20249" }