//向客户端发送消息
private void SendtoClient(User user, string message)
{
//匿名方式发送
UdpClient sendUdpClient = new UdpClient(0);
byte[] sendBytes = Encoding.Unicode.GetBytes(message);
remoteIPEndPoint = user.GetIPEndPoint();
sendUdpClient.Send(sendBytes, sendBytes.Length, remoteIPEndPoint);
sendUdpClient.Close();
}
//接收消息
private void ReceiveMessage()
{
remoteIPEndPoint = new IPEndPoint(IPAddress.Any, 0);
while (true)
{
try
{
if (stopFlag_receiveMessage)
{
break;
}
string[] splitsubstring = null;
IPEndPoint clientIPEndPoint = null;
//关闭receiveUdpClient时下面一行代码会产生异常
byte[] receiveBytes = receiveUdpClient.Receive(ref remoteIPEndPoint);
string message = Encoding.Unicode.GetString(receiveBytes, 0, receiveBytes.Length);
//显示消息内容
listBox1.Items.Add(string.Format("[服务端接收数据]{0}:{1}", remoteIPEndPoint, message));
//处理消息数据
//服务器接受消息后做处理
string[] splitstring = message.Split(',');
//解析用户端地址
if (splitstring[0] != "qunliao")
{
splitsubstring = splitstring[2].Split(':');
clientIPEndPoint = new IPEndPoint(IPAddress.Parse(splitsubstring[0]), int.Parse(splitsubstring[1]));
}
switch (splitstring[0])
{
//若为登录信息
case "login":
User user = new User(splitstring[1], clientIPEndPoint);
//往在线的用户列表添加新成员
userList.Add(user);
listBox1.Items.Add(string.Format("[服务端接收数据]用户{0}{1}加入", user.GetName(), user.GetIPEndPoint()));
string sendString = "Accept," + txbServerPort.Text;
//向客户端发送应答消息
SendtoClient(user, sendString);
listBox1.Items.Add(string.Format("[服务端接收数据]向{0}{1}发出:[{2}]", user.GetName(), user.GetIPEndPoint(), sendString));
for (int i = 0; i < userList.Count; i++)
{
if (userList[i].GetName() != user.GetName())
{
//给在线的其他用户发送广播消息
//通知有新用户加入
SendtoClient(userList[i], message);
}
}
listBox1.Items.Add(string.Format("[服务端接收数据]广播:[{0}]", message));
break;
case "logout":
for (int i = 0; i < userList.Count; i++)
{
if (userList[i].GetName() == splitstring[1])
{
userList.RemoveAt(i); //移除用户
listBox1.Items.Add(string.Format("[服务端接收数据]用户{0}({1})退出", userList[i].GetName(), userList[i].GetIPEndPoint()));
}
for (int j = 0; j < userList.Count; j++)
{
//广播注销消息
SendtoClient(userList[i], message);
}
listBox1.Items.Add(string.Format("[服务端接收数据]广播:[{0}]", message));
break;
}
break;
case "qunliao":
listBox1.Items.Add("[服务端接收数据]收到群发消息");
for (int j = 0; j < userList.Count; j++)
{
//广播注销消息
SendtoClient(userList[j], message);
}
listBox1.Items.Add(string.Format("[服务端接收数据]广播:[{0}]", message));
break;
}
}
catch (Exception)
{
break;
}
listBox1.Items.Add(string.Format("[服务端接收数据]serverIPEndPoint={0} 接收消息 ", serverIPEndPoint));
}
}