/*a character '$' is used as a terminator for every client-server message,
* also the message always starts with either "I:" or "M:", which specifies whether
* it's a text message from the client, or a background information for the app*/
private void SendMessage(string msg)
{
try
{
serverStream = clientSocket.GetStream();
byte[] outStream = Encoding.Unicode.GetBytes("M:" + msg + "$");
serverStream.Write(outStream, 0, outStream.Length);
serverStream.Flush();
}
//handled the case when server is down
catch
{
serverDead = true;
PopForm p = new PopForm("Server down");
p.ShowDialog();
this.Hide();
p.Closed += (s, args) => this.Close();
}
}
private void listBox1_DoubleClick(object sender, EventArgs e)
{
if (listBox1.SelectedItems.Count > 0)
{
NetworkStream serverStream = clientSocket.GetStream();
//the chosen room is send to the server
byte[] outStream = Encoding.Unicode.GetBytes("I:" + listBox1.SelectedItem.ToString() + "$");
serverStream.Write(outStream, 0, outStream.Length);
string answer = "";
serverStream = clientSocket.GetStream();
byte[] inStream = new byte[10025];
//answer from the server is read
serverStream.Read(inStream, 0, inStream.Length);
answer = Encoding.Unicode.GetString(inStream);
if (answer.StartsWith("I:"))
{
answer = answer.Substring(0, answer.IndexOf("$"));
answer = answer.Substring(2, answer.Length - 2);
//handled the case when the room got removed while choosing
if (answer == "RoomGone")
{
this.Hide();
var p = new PopForm("This room dissapeared :/");
p.Closed += (s, args) => this.Show();
p.Show();
}
//if everything is ok, the chat window is showed
else
{
this.Hide();
var f = new Form1(ip, username, clientSocket, listBox1.SelectedItem.ToString());
f.Show();
closedByStupidUser = false;
}
}
}
}
private void button1_Click(object sender, EventArgs e)
{
usernameUsed = false;
connected = false;
string in1 = textBox1.Text;
string in2 = textBox2.Text;
//ip address check and username check are both performed
if (IPAddress.TryParse(in1, out ip))
{
ip = IPAddress.Parse(in1);
correctIP = true;
}
else
{
label1.Text = "Please enter a valid IPv4 address";
correctIP = false;
label3.Text = "";
}
if (r.IsMatch(in2) && in2.Length > 2 && in2.Length < 13)
{
userName = in2;
correctUsername = true;
}
else
{
userName = in2; ////
label2.Text = "Letters and numbers only, 3-12 chars";
correctUsername = false;
label3.Text = "";
}
//if both are correct, client will try to send a chosen username, which is
//anticipated by the server
if (correctIP && correctUsername)
{
TcpClient clientsocket = new TcpClient();
NetworkStream serverStream = default(NetworkStream);
try
{
//port 8888 is chosen for the app
clientsocket.Connect(ip, 8888);
connected = true;
serverStream = clientsocket.GetStream();
byte[] outStream = Encoding.Unicode.GetBytes("I:" + userName + "$");
serverStream.Write(outStream, 0, outStream.Length);
string answer = null;
//waiting for an answer from the server
while (true)
{
answer = "";
serverStream = clientsocket.GetStream();
byte[] inStream = new byte[10025];
serverStream.Read(inStream, 0, inStream.Length);
answer = Encoding.Unicode.GetString(inStream);
if (answer.StartsWith("I:"))
{
answer = answer.Substring(0, answer.IndexOf("$"));
answer = answer.Substring(2, answer.Length - 2);
//distinguishing whether the username is ok
if (answer == "UsernameExists")
{
usernameUsed = true; break;
}
if (answer == "UrOK")
{
break;
}
}
else
{
this.Hide();
var p = new PopForm("DunnoWhatHappened");
p.Closed += (s, args) => this.Close();
p.Show();
}
}
}
catch
{
connected = false;
}
if (connected && !usernameUsed)
{
/* this.Hide();
* var f = new Form1(ip, userName, clientsocket);
* f.Closed += (s, args) => this.Close();
* f.Show();*/////
this.Hide();
var f = new Form3(ip, userName, clientsocket);
f.Closed += (s, args) => this.Close();
f.Show();
}
//if the connection attempt failed for some reason, e.g. server not running on a specified ip
else if (!connected)
{
label3.Text = "Could not connect";
}
else if (usernameUsed)
{
this.Hide();
var p = new PopForm("Username exists");
p.Closed += (s, args) => this.Show();
p.Show();
}
}
}
