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POProgram crashes after trying to close() serial port
 

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  1. POProgram crashes after trying to close() serial port
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    <p>I am writing application to control robot. I have a button click method, which should open or close port.</p> <pre><code>private void cONNECTToolStripMenuItem_CheckStateChanged( object sender, EventArgs e) { if (cONNECTToolStripMenuItem.Checked) { cONNECTToolStripMenuItem.Text = "DISCONNECT!"; ports.connect(); } else { cONNECTToolStripMenuItem.Text = "CONNECT!"; ports.disconnect(); } } </code></pre> <p>Furthermore, I have DataReceived event handler, which is called after some data from serial port is received.</p> <pre><code>private void serialPort_DataReceived( object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { SerialPort sp = (SerialPort)sender; string data = sp.ReadExisting(); mainForm.addData(data); } </code></pre> <p>When this event handler was trying to call addData(data) function</p> <pre><code>public void addData(string data) { //if (!this.Disposing || !this.IsDisposed || // !this.listBox1.Disposing || !this.listBox1.IsDisposed) if (this.listBox1.InvokeRequired) { SetTextCallback d = new SetTextCallback(addData); this.Invoke(d, new object[] { data }); } else listBox1.Items.Add(data); } </code></pre> <p>there was a cross-thread error, so I wrapped function content into InvokeRequired condition.</p> <p>Now there is other errors: 1. Program crashes after trying to call ports.disconnect() function</p> <pre><code>public void disconnect() { serialPort.Close(); } </code></pre> <p>ports class:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO.Ports; using System.Threading; namespace server_client { public class COM_Port { private Main_Form mainForm; public SerialPort serialPort; //MySQL - 1, XML File - 2, None - 0 public int writeStatus; public COM_Port(Main_Form form) { mainForm = form; //by default niekur neirasineja nebent pasirenka writeStatus = 0; //sukuriam serialPort kintamaji serialPort = new SerialPort(); //nustatom duomenis portui serialPort.BaudRate = 9600; serialPort.DataBits = 8; serialPort.StopBits = StopBits.One; serialPort.ReadTimeout = 500; serialPort.WriteTimeout = 500; } ~COM_Port() { disconnect(); serialPort.Dispose(); } public void connect() { if (!serialPort.IsOpen) if (serialPort.PortName != "") serialPort.Open(); else MessageBox.Show("Please choose COM Port in settings."); } public void disconnect() { //serialPort.DiscardInBuffer(); //serialPort.DiscardOutBuffer(); serialPort.Close(); } public void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { string data = null; SerialPort sp = (SerialPort)sender; if (sp.IsOpen) data = sp.ReadExisting(); else data = null; //perduoda duomenis atvaizdavimui i maina if (data != null) { mainForm.addData(data); switch (writeStatus) { //neirasyti case 0: break; //irasyti i mysql case 1: MySQL mysql = new MySQL(); break; //irasyti i xml file case 2: File file = new File(); break; default: break; } } } } } </code></pre> <p>I believe, that after closing the port robot is still sending me data and DataReceived event handler tries to get that data from buffer of serial port.</p> <p>Thank you for reading this love letter, for your help :).</p>
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    1. USRokas
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    1. COAdd try/catch block to your functions and event-handlers then see what exception you get.
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      1. USCoder
    2. COWhat does "crash" mean?
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      1. USUwe Keim
    3. COCrash in my situation means, that the program is not responding anymore and I cant get any errors to my visual studio ;/
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      1. USRokas
 

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