private void btn_Send_Click(object sender, EventArgs e)
{
#region Initialization
lst_clssSqaure.Clear();
objPacket = new clssSqaure(10 - winwidth, 20, 1, color_Violet);
lst_clssSqaure.Add(objPacket);
send_file = true;
dtstart = DateTime.Now;
if (txt_Timeout.Text != string.Empty)
{
durtimeout = int.Parse(txt_Timeout.Text);
}
else
{
durtimeout = 3;//default value
}
#endregion
if (rbn_goback_N.Checked)
{
if (!continue_receive)
{
continue_receive = true;
}
//modify window size to the count of remaining items
WindowSize = Convert.ToInt32(num_win_size.Value);
if (WindowSize > Lstbx_Sender.Items.Count)
{
WindowSize = Lstbx_Sender.Items.Count;
}
for (int i = 0; i < WindowSize; i++)
{
QueuePacs.Enqueue(Lstbx_Sender.Items[i]);
}
timer1.Enabled = simpleOpenGlControl1.Visible = true;
}
else
{
if (!continue_receive)
{
continue_receive = true;
}
//modify window size to the count of remaining items
WindowSize = Convert.ToInt32(num_win_size.Value);
if (WindowSize > Lstbx_Sender.Items.Count)
{
WindowSize = Lstbx_Sender.Items.Count;
}
for (int i = 0; i < WindowSize; i++)
{
QueuePacs.Enqueue(Lstbx_Sender.Items[i]);
}
timer1.Enabled = simpleOpenGlControl1.Visible = true;
}
}
private void SlidingWindow(TimeSpan tsSend_Time, bool bIsGoBackN)
{
object[] arr_Frames = QueuePacs.ToArray();
if (QueuePacs.Count != 0)//Sending Frames
{
objPacket.Packxpos += pacspeed * objPacket.Packv_X;
lbl_sender.Text = "Sending " + arr_Frames[0].ToString();
lbl_receiver.Text = "Receiving " + arr_Frames[0].ToString();
if (objPacket.Packxpos + drlen > winwidth)//frame reached Recceiver
{
object Objreceivedframe = QueuePacs.Dequeue();
if (tsSend_Time.Seconds < durtimeout) //within time
{
if (continue_receive) //sending was not interrupted,receive frames normally
{
Lstbx_Receiver.Items.Add(Objreceivedframe);
Lstbx_Log.Items.Add(Objreceivedframe.ToString() + " Received");
Lstbx_Log.Items.Add("Time elapsed " + tsSend_Time.Milliseconds + " MilliSeconds");
QueueAcks.Enqueue(Objreceivedframe);
objAck = new clssSqaure(winwidth, -20, -1, color_Red);//Send Ack
lst_clssSqaure.Add(objAck);
}
}
else//frame exceeded time
{
Lstbx_Log.Items.Add(Objreceivedframe.ToString() + " Timed out");
if (bIsGoBackN && continue_receive)
{
Lstbx_Log.Items.Add("Receiver stopped receiving");
Lstbx_Log.Items.Add("Time elapsed " + tsSend_Time.Milliseconds + "MilliSeconds");
continue_receive = false;//stop receiving
}
}
dtstart = DateTime.Now; //reset time
objPacket.Packxpos = 10 - winwidth; //reset Frame position
}
}
if (QueueAcks.Count != 0)//Sending Ack
{
objAck.Packxpos += pacspeed * 2 * objAck.Packv_X;
if (((objAck.Packxpos - drlen + 10) < (winwidth * -1)))//Ack arrived to Tx
{
int counter;
Lstbx_Log.Items.Add("Hurray Acknowledge received");//h
counter = Lstbx_Log.Items.Count / 3;
Lstbx_Log.Items.Add("Total no: of packets received " + counter);
Lstbx_Sender.Items.Remove(QueueAcks.Dequeue());
lst_clssSqaure.Remove(objAck);
}
}
if (QueuePacs.Count == 0 && QueueAcks.Count == 0)
{
lbl_receiver.Text = lbl_sender.Text = "Ready";
lbl_TimeElapsed.Text = string.Empty;
}
}
