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POconstantly check if Server is listening on a given port with C#
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  1. POconstantly check if Server is listening on a given port with C#
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    copied!<p>thanks to this answer I was able to determine if Server is listening on a given port or not:</p> <p><a href="https://stackoverflow.com/questions/1062035/how-to-config-socket-connect-timeout-in-c-sharp">How to configure socket connect timeout</a></p> <p>now I'm trying to create an endless loop, which will be loaded on form_load event and will be constantly checking if server is listening.</p> <p>here is my code:</p> <pre><code> Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IAsyncResult result = socket.BeginConnect("192.168.0.131", 1095, null, null); bool success = result.AsyncWaitHandle.WaitOne(500, true); if (!socket.Connected) {label3.Text = "can't use"; socket.Close();} else {label3.Text = "start action";} </code></pre> <p>If I put following code into "on_button_click" event - everything works fine (except for - I have to click the button every single time I want to refresh status)</p> <p>and when I create endless loop - I'm not getting any results at all:</p> <pre><code>while (true) { Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IAsyncResult result = socket.BeginConnect("192.168.0.131", 1095, null, null); bool success = result.AsyncWaitHandle.WaitOne(500, true); if (!socket.Connected) { label3.Text = "can't use"; socket.Close(); } else { //success = true; label3.Text = "start action"; socket.Close(); } } </code></pre> <p>I guess it has something to do with threading but I just can't figure it out. What might be the problem?</p> <p><strong>Edit:</strong></p> <p>timer tick solution:</p> <pre><code>private void Form1_Load_1(object sender, EventArgs e) { System.Windows.Forms.Timer MyTimer = new System.Windows.Forms.Timer(); MyTimer.Interval = (200); MyTimer.Tick += new EventHandler(MyTimer_Tick); MyTimer.Start(); } public void MyTimer_Tick(object sender, EventArgs e) { Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IAsyncResult result = socket.BeginConnect("192.168.0.131", 1095, null, null); bool success = result.AsyncWaitHandle.WaitOne(500, true); if (!socket.Connected) { label3.Text = "can't use"; socket.Close(); //throw new ApplicationException(); } else { //success = true; label3.Text = "start action"; socket.Close(); } } </code></pre>
 

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