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AuthorForum: PowerTCP Telnet for .NET
Topic: Proper procedure to wait at main thread
xplorer2k

From: Oxnard, CA USA
Posts: 33
Member Since: 03/27/09
posted March 12, 2010 5:58 PM

Hi Everyone,

What is the proper way to wait at main thread when using telnet1.Start(automateSession, null)?
I want to continue executing more code upon completion of telnet1.Start(automateSession, null). Sample code:


private void button1_Click(object sender, EventArgs e)
{
  //Event handlers were added in the designer
  //Start the process on a worker thread (no state info passed in)
  telnet1.Start(automateSession, null);
}

private void automateSession(Telnet telnet, object notUsed)
{
  //This function executes on a worker thread, providing multi-threaded, asynchronous operation
  try
  {
    //Connect
    telnet.Connect("myServer");
    
    //Login to the server, marshal data to the UI thread
    telnet.Marshal(telnet.Login("myUsername", "myPassword", "$"), null);

    //Send a list command
    telnet.Write("ls -la\r");

    //Wait for prompt, marshal data to the UI thread
    telnet.Marshal(telnet.Read("$"), null);

    //Send an exit command; server will close the connection
    telnet.Write("exit\r");

    //Read any remaining data before the shutdown
    telnet.Marshal(telnet.ReadToEnd(), null);
  }
  catch (Exception ex)
  {
    //Report errors to the UI thread
    telnet.Marshal(ex);
  }
}

void telnet1_Data(object sender, DataEventArgs e)
{
  //Add data received to the textbox
  textBox1.AppendText(e.Data.ToString());
}

void telnet1_Error(object sender, System.IO.ErrorEventArgs e)
{
  //Add error messages to the textbox
  textBox1.AppendText(e.GetException().Message);
}

void telnet1_StateChanged(object sender, EventArgs e)
{
  //Change appearance of textbox when connected
  textBox1.BackColor = (telnet1.State == ConnectionState.Closed)
    ? SystemColors.ControlDark 
    : SystemColors.ControlLight;
}

Thanks very much,
xplorer2k
Jamie Powell (Admin)

From: Rome, NY USA
Posts: 379
Member Since: 03/13/07

Extra Support Options
Custom Application Development

posted March 15, 2010 4:34 PM

You can call automateSession as a blocking call, instead of with telnet1.Start (which calls a method asynchronously). This should provide a solution for what you have described.

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xplorer2k

From: Oxnard, CA USA
Posts: 33
Member Since: 03/27/09
posted March 15, 2010 7:27 PM

Thanks Jamie,

However, I need to make this call asynchronously, as I will need to run 10 or 20 threads in parallel (asynchronously), then wait at main thread upon completion of each/all these threads.

I don't want to do this synchronously as it will take longer. Thanks again,
xplorer2k
xplorer2k

From: Oxnard, CA USA
Posts: 33
Member Since: 03/27/09
posted March 18, 2010 6:22 PM

Thanks Jamie,

I need to make calls asynchronously, as I will need to run 10 or 20 threads in parallel (asynchronously), then wait at main thread upon completion of each/all these threads. Thanks again,

xplorer2k
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