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package localchat
import (
"encoding/json"
"fmt"
"log"
"net"
)
// import (
// "encoding/json"
// "fmt"
// "godo/libs"
// "log"
// "net"
// "strings"
// )
// SendToIP 向指定的 IP 地址发送 UDP 消息
func SendToIP(message UdpMessage) error {
toIp := message.IP
port := GetBroadcastPort()
addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%s", toIp, port))
if err != nil {
log.Printf("Failed to resolve UDP address %s:%s: %v", toIp, port, 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", toIp, err)
return err
}
defer conn.Close()
data, err := json.Marshal(message)
if err != nil {
log.Printf("Failed to marshal JSON for %s: %v", toIp, err)
return err
}
_, err = conn.WriteToUDP(data, addr)
if err != nil {
log.Printf("Failed to write to UDP address %s: %v", toIp, err)
return err
}
log.Printf("发送 UDP 消息到 %s 成功", toIp)
return nil
}
// // 获取 OnlineUsers 的最新状态
//
// func GetOnlineUsers() map[string]UdpMessage {
// return OnlineUsers
// }
//
// func GetLocalIP() (string, error) {
// return libs.GetIPAddress()
// }