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44 lines
943 B

package localchat
import (
"encoding/json"
"fmt"
"log"
"net"
)
func StartServiceDiscovery() {
// 解析多播地址
addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
if err != nil {
fmt.Println("Error resolving multicast address:", err)
return
}
// 监听本地网络接口上的多播地址
conn, err := net.ListenMulticastUDP("udp4", nil, addr)
if err != nil {
fmt.Println("Error listening on multicast address:", err)
return
}
defer conn.Close()
buffer := make([]byte, 1024)
for {
n, addr, err := conn.ReadFromUDP(buffer)
if err != nil {
log.Printf("Error reading from UDP: %v", err)
continue
}
fmt.Printf("Received message: %s from %s\n", buffer[:n], addr)
var udpMsg UdpMessage
err = json.Unmarshal(buffer[:n], &udpMsg)
if err != nil {
fmt.Printf("Error unmarshalling JSON: %v\n", err)
continue
}
log.Printf("Get message: %+v", udpMsg)
OnlineUsers[udpMsg.IP] = udpMsg
}
}