Serial Port DataReceived Event in .Net 2.0

You would need to use Control.Invoke() to update the GUI controls because unlike Windows Forms events like Button.Click which are processed in the GUI thread, SerialPort events are processed in a non-GUI thread (more precisely a ThreadPool thread). The easiest way for you to update your controls would be to change the following code:

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{// Event for receiving data
// Read the buffer to text box.
statusBar1.Text = "Getting Data";
statusBar1.Refresh();
txtData.Text = txtData.Text + port.ReadExisting();
}

into this:

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)

{// Event for receiving data

// Read the buffer to text box.

this.Invoke(new EventHandler(DoUpdate));

private void DoUpdate(object s, EventArgs e)

AnthonyWong6 at 2007-9-8 >

Ed Tenholder

jebrown wrote:

Hi there, This is driving me crazy, I cannot seem to get the DataRecieved event to work on the Pocket PC using the new serial port class in Visual Studio 2005 with C#. The DataRecieved event just never seems to be called. I can write data to the port just fine. Here is some very simple sample code that reproduces the error:. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO.Ports; namespace SerialTest { public partial class Form1 : Form { // Setup the port private SerialPort port = new SerialPort("COM8", 38400, Parity.None, 8, StopBits.One); public Form1() { InitializeComponent(); // Enable Event handler port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived); } private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) {// Event for receiving data // Read the buffer to text box. statusBar1.Text = "Getting Data"; statusBar1.Refresh(); txtData.Text = txtData.Text + port.ReadExisting(); } private void btn_Send_Click(object sender, EventArgs e) {// Button to send test data try { port.WriteLine("This is a test Line"); } catch (Exception wex) { MessageBox.Show(wex.ToString()); } } private void btn_OpenPort_Click(object sender, EventArgs e) {// Button to open the port // Begin communications if (port.IsOpen == false) try { port.Open(); } catch (Exception oex) { MessageBox.Show(oex.ToString()); } } private void btn_ClosePort_Click(object sender, EventArgs e) { // Button to close the port port.Close(); } private void btn_Close_Click(object sender, EventArgs e) {// Button to exit the app. this.Close(); } I think I have the same problem described in this thread : http://forums.microsoft.com/msdn/ShowPost.aspx?PostID=6727 But InvokeRequired does not exist in the CF, and I really don't grasp the solution described anyway. I appreciate any suggestions. Jason

EdTenholder at 2007-9-8 >

Can I send any AT command to serialPort and read the result(OK) ?

DishanFernando at 2007-9-8 >

Greetings Anthony,

I am curious as to whether you managed to get this to work. I am having a similar issue. I added the little patch ( DoUpdate ) and that does not work either.

My target system is am Axim x51, WM5, NET CF 2.0 developed in C# in VS 2005 Pro.

I realy need to get this to function soon. I have been looking everywhere and had no luck ( tried Franson.com, 32feet.net ).

Any assistance would greatly be appreciated.

Thanks.

David

DGretlein at 2007-9-8 >

this works beautifully with setting DtrEnable = true

SimranJindal at 2007-9-8 >