Using Serialports with Win Forms

[Michael Tallhamer]

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output to a
textBox in my application for viewing. I however keep getting this error and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Floyd Burger]

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output
to a
textBox in my application for viewing. I however keep getting this error
and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Michael Tallhamer]

Thanks you were correct. After some looking I also found a good explanaton of
this here http://msmvps.com/coad/archive/2005/03/23/39466.aspx if anyone else
has this type of problem and needs some help as well

I however have a new question. I am attached to and accelerator that takes
internal measurements on a set of two ion chambers and automatically dumps
the data to the port after the data sets are read off the chambers. The
problem I have is the streams of data aren't always uniform in length so I
can't set a threshold for the DataRecieved event to be fired. I need some way
of determining when the stream of data is complete so I can then read in the
entire stream, parse it, and write out the values to a SQL database. I can't
seam to figure out how to determine the end of the stream since there is
nothing like a DataTransferCom plete event handler. I was thinking of trying
to use the SerialData.Eof object but need to know how to catch it and/or
idetify it in the bit stream and don't quite know how to set it up (possibly
my inexperience with the .Net Framework showing through)

Thanks again Floyd
--
Mike -- mi************@ usoncology.com
"Floyd Burger" wrote:

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output
to a
textBox in my application for viewing. I however keep getting this error
and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Floyd]

Mike,
I'm not familiar with the SerialPort, I've used it but it's not as easy to
collect data as the ComPort in the TransPort library from ComponentScienc e.
You might want to take a look at that. You can define a regex to match your
block of data.
Other than that, read in each byte and construct the response block
manually. Chances are that the block will have a terminator char that you
can watch for.
--
Floyd
"Michael Tallhamer" wrote:

Thanks you were correct. After some looking I also found a good explanaton of
this here http://msmvps.com/coad/archive/2005/03/23/39466.aspx if anyone else
has this type of problem and needs some help as well

I however have a new question. I am attached to and accelerator that takes
internal measurements on a set of two ion chambers and automatically dumps
the data to the port after the data sets are read off the chambers. The
problem I have is the streams of data aren't always uniform in length so I
can't set a threshold for the DataRecieved event to be fired. I need some way
of determining when the stream of data is complete so I can then read in the
entire stream, parse it, and write out the values to a SQL database. I can't
seam to figure out how to determine the end of the stream since there is
nothing like a DataTransferCom plete event handler. I was thinking of trying
to use the SerialData.Eof object but need to know how to catch it and/or
idetify it in the bit stream and don't quite know how to set it up (possibly
my inexperience with the .Net Framework showing through)

Thanks again Floyd
--
Mike -- mi************@ usoncology.com
"Floyd Burger" wrote:

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output
to a
textBox in my application for viewing. I however keep getting this error
and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng()); }
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Floyd]

Mike,
I'm not familiar with the SerialPort, I've used it but it's not as easy to
collect data as the ComPort in the TransPort library from ComponentScienc e.
You might want to take a look at that. You can define a regex to match your
block of data.
Other than that, read in each byte and construct the response block
manually. Chances are that the block will have a terminator char that you
can watch for.
--
Floyd
"Michael Tallhamer" wrote:

Thanks you were correct. After some looking I also found a good explanaton of
this here http://msmvps.com/coad/archive/2005/03/23/39466.aspx if anyone else
has this type of problem and needs some help as well

I however have a new question. I am attached to and accelerator that takes
internal measurements on a set of two ion chambers and automatically dumps
the data to the port after the data sets are read off the chambers. The
problem I have is the streams of data aren't always uniform in length so I
can't set a threshold for the DataRecieved event to be fired. I need some way
of determining when the stream of data is complete so I can then read in the
entire stream, parse it, and write out the values to a SQL database. I can't
seam to figure out how to determine the end of the stream since there is
nothing like a DataTransferCom plete event handler. I was thinking of trying
to use the SerialData.Eof object but need to know how to catch it and/or
idetify it in the bit stream and don't quite know how to set it up (possibly
my inexperience with the .Net Framework showing through)

Thanks again Floyd
--
Mike -- mi************@ usoncology.com
"Floyd Burger" wrote:

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output
to a
textBox in my application for viewing. I however keep getting this error
and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng()); }
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Michael Tallhamer]

Thanks for the suggestion Floyd. I was able to figure out a solution and have
pasted the port_Datareciev ed event handler code I wrote below in the event
someone out there comes up against a similar problem. It may not be the most
elegant solution but it appears to work very efficiently and handled hundreds
of random length data transfers in its initial testing last night. I ended up
using the System.IO.Ports .SerialPort.Rea dTimeout property and the
System.TimeoutE xception in a try/catch/finally statement to identify the end
of the serial stream. Hope this is able to help someone else out there and if
it does let me know what you think or if you have any better suggestions. I'm
always learning

EVENT HANDLER CODE:

private void port_DataReceiv ed(object sender, SerialDataRecei vedEventArgs e)
{
//Setup a bool for use in the while loop that
//will continue to monitor the input stream
bool readingStatus = true;

//String object to recieve the stream as it is read in
string inputString = "";

//Set the ReadTimeout property to be used to triger
//the System.TimeoutE xception that will identify the
//end of the stream
port.ReadTimeou t = 1000;

//If the window state is minimized bring the terminal window
//up so you can view the output
if ((this.WindowSt ate != FormWindowState .Normal) ||
(this.WindowSta te != FormWindowState .Maximized))
{
ViewMainApp popupHandler = new ViewMainApp(Pop UpMainApp);
this.Invoke(pop upHandler);
}

//Used to catch the System.TimeoutE xception when it occurs
try
{
while (readingStatus)
{
inputString += port.ReadLine() + "\n";
}
}
catch (TimeoutExcepti on exception)
{
//reset the Readtimeout to InfiniteTimeout to prepare for
the next data set
port.ReadTimeou t = SerialPort.Infi niteTimeout;
}
finally
{
//Set textBox.Text to inputString via an Invoke from the
application thread
SetTextDelegate handler = new SetTextDelegate (SetText);
this.Invoke(han dler,inputStrin g.ToString());

//Clear the InBuffer to get ready for the next data set
port.DiscardInB uffer();
}
}
--
Mike - mi************@ usoncology.com
"Floyd" wrote:

Mike,
I'm not familiar with the SerialPort, I've used it but it's not as easy to
collect data as the ComPort in the TransPort library from ComponentScienc e.
You might want to take a look at that. You can define a regex to match your
block of data.
Other than that, read in each byte and construct the response block
manually. Chances are that the block will have a terminator char that you
can watch for.
--
Floyd
"Michael Tallhamer" wrote:

Thanks you were correct. After some looking I also found a good explanaton of
this here http://msmvps.com/coad/archive/2005/03/23/39466.aspx if anyone else
has this type of problem and needs some help as well

I however have a new question. I am attached to and accelerator that takes
internal measurements on a set of two ion chambers and automatically dumps
the data to the port after the data sets are read off the chambers. The
problem I have is the streams of data aren't always uniform in length so I
can't set a threshold for the DataRecieved event to be fired. I need some way
of determining when the stream of data is complete so I can then read in the
entire stream, parse it, and write out the values to a SQL database. I can't
seam to figure out how to determine the end of the stream since there is
nothing like a DataTransferCom plete event handler. I was thinking of trying
to use the SerialData.Eof object but need to know how to catch it and/or
idetify it in the bit stream and don't quite know how to set it up (possibly
my inexperience with the .Net Framework showing through)

Thanks again Floyd
--
Mike -- mi************@ usoncology.com
"Floyd Burger" wrote:

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...
>I am a medical physicist new to the .Net Framework and am trying to write a
> simple app that will monitor the output from a serial port on one of my
> linear accelerators using the new Serialport object and write the output
> to a
> textBox in my application for viewing. I however keep getting this error
> and
> am unable to figure out how to get around this.
>
> System.InvalidO perationExcepti on was unhandled
> Message="Cross-thread operation not valid: Control 'textBox1' accessed
> from a thread other than the thread it was created on."
> Source="System. Windows.Forms"
>
> I have attached the code from my simple form for review in the event some
> one can help me
>
> Thank You
> Michael Tallhamer
>
> using System;
> using System.Collecti ons.Generic;
> using System.Componen tModel;
> using System.Data;
> using System.Drawing;
> using System.Text;
> using System.Windows. Forms;
> using System.IO;
> using System.IO.Ports ;
>
> namespace MorningCheckRea der
> {
> public partial class Form1 : Form
> {
> // Create the serial port with basic settings
> private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
> 8,
> StopBits.One);
>
> public Form1()
> {
> InitializeCompo nent();
> }
>
> private void button1_Click(o bject sender, EventArgs e)
> {
> // Attach a method to be called when there is data waiting in
> the port's
> buffer
> port.DataReceiv ed += new SerialDataRecei vedEventHandler
>
> (port_DataRecei ved);
>
> //Open the port
> port.Open();
> }
>
> private void button2_Click(o bject sender, EventArgs e)
> {
> port.Close();
> }
>
> private void port_DataReceiv ed(object sender,
> SerialDataRecei vedEventArgs e)
> {
>
> // Show all the incoming data in the port's buffer
> if (textBox1.Text. Length > 0)
> {
> textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
> 1,
>
> port.ReadExisti ng()); }
> else
> {
> textBox1.Text = port.ReadExisti ng();
> }
> }
> }
> }
>
>
> --
> Mike

[Michael Tallhamer]

Thanks for the suggestion Floyd. I was able to figure out a solution and have
pasted the port_Datareciev ed event handler code I wrote below in the event
someone out there comes up against a similar problem. It may not be the most
elegant solution but it appears to work very efficiently and handled hundreds
of random length data transfers in its initial testing last night. I ended up
using the System.IO.Ports .SerialPort.Rea dTimeout property and the
System.TimeoutE xception in a try/catch/finally statement to identify the end
of the serial stream. Hope this is able to help someone else out there and if
it does let me know what you think or if you have any better suggestions. I'm
always learning

EVENT HANDLER CODE:

private void port_DataReceiv ed(object sender, SerialDataRecei vedEventArgs e)
{
//Setup a bool for use in the while loop that
//will continue to monitor the input stream
bool readingStatus = true;

//String object to recieve the stream as it is read in
string inputString = "";

//Set the ReadTimeout property to be used to triger
//the System.TimeoutE xception that will identify the
//end of the stream
port.ReadTimeou t = 1000;

//If the window state is minimized bring the terminal window
//up so you can view the output
if ((this.WindowSt ate != FormWindowState .Normal) ||
(this.WindowSta te != FormWindowState .Maximized))
{
ViewMainApp popupHandler = new ViewMainApp(Pop UpMainApp);
this.Invoke(pop upHandler);
}

//Used to catch the System.TimeoutE xception when it occurs
try
{
while (readingStatus)
{
inputString += port.ReadLine() + "\n";
}
}
catch (TimeoutExcepti on exception)
{
//reset the Readtimeout to InfiniteTimeout to prepare for
the next data set
port.ReadTimeou t = SerialPort.Infi niteTimeout;
}
finally
{
//Set textBox.Text to inputString via an Invoke from the
application thread
SetTextDelegate handler = new SetTextDelegate (SetText);
this.Invoke(han dler,inputStrin g.ToString());

//Clear the InBuffer to get ready for the next data set
port.DiscardInB uffer();
}
}
--
Mike - mi************@ usoncology.com
"Floyd" wrote:

Mike,
I'm not familiar with the SerialPort, I've used it but it's not as easy to
collect data as the ComPort in the TransPort library from ComponentScienc e.
You might want to take a look at that. You can define a regex to match your
block of data.
Other than that, read in each byte and construct the response block
manually. Chances are that the block will have a terminator char that you
can watch for.
--
Floyd
"Michael Tallhamer" wrote:

Thanks you were correct. After some looking I also found a good explanaton of
this here http://msmvps.com/coad/archive/2005/03/23/39466.aspx if anyone else
has this type of problem and needs some help as well

I however have a new question. I am attached to and accelerator that takes
internal measurements on a set of two ion chambers and automatically dumps
the data to the port after the data sets are read off the chambers. The
problem I have is the streams of data aren't always uniform in length so I
can't set a threshold for the DataRecieved event to be fired. I need some way
of determining when the stream of data is complete so I can then read in the
entire stream, parse it, and write out the values to a SQL database. I can't
seam to figure out how to determine the end of the stream since there is
nothing like a DataTransferCom plete event handler. I was thinking of trying
to use the SerialData.Eof object but need to know how to catch it and/or
idetify it in the bit stream and don't quite know how to set it up (possibly
my inexperience with the .Net Framework showing through)

Thanks again Floyd
--
Mike -- mi************@ usoncology.com
"Floyd Burger" wrote:

Use the TextBox.Invoke or BeginInvoke to call a method that updates the text
box from the UI thread. What you're doing is updating the UI from a non-UI
thread.

--
Floyd

"Michael Tallhamer" <Mi************ **@discussions. microsoft.com> wrote in
message news:5C******** *************** ***********@mic rosoft.com...
>I am a medical physicist new to the .Net Framework and am trying to write a
> simple app that will monitor the output from a serial port on one of my
> linear accelerators using the new Serialport object and write the output
> to a
> textBox in my application for viewing. I however keep getting this error
> and
> am unable to figure out how to get around this.
>
> System.InvalidO perationExcepti on was unhandled
> Message="Cross-thread operation not valid: Control 'textBox1' accessed
> from a thread other than the thread it was created on."
> Source="System. Windows.Forms"
>
> I have attached the code from my simple form for review in the event some
> one can help me
>
> Thank You
> Michael Tallhamer
>
> using System;
> using System.Collecti ons.Generic;
> using System.Componen tModel;
> using System.Data;
> using System.Drawing;
> using System.Text;
> using System.Windows. Forms;
> using System.IO;
> using System.IO.Ports ;
>
> namespace MorningCheckRea der
> {
> public partial class Form1 : Form
> {
> // Create the serial port with basic settings
> private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
> 8,
> StopBits.One);
>
> public Form1()
> {
> InitializeCompo nent();
> }
>
> private void button1_Click(o bject sender, EventArgs e)
> {
> // Attach a method to be called when there is data waiting in
> the port's
> buffer
> port.DataReceiv ed += new SerialDataRecei vedEventHandler
>
> (port_DataRecei ved);
>
> //Open the port
> port.Open();
> }
>
> private void button2_Click(o bject sender, EventArgs e)
> {
> port.Close();
> }
>
> private void port_DataReceiv ed(object sender,
> SerialDataRecei vedEventArgs e)
> {
>
> // Show all the incoming data in the port's buffer
> if (textBox1.Text. Length > 0)
> {
> textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
> 1,
>
> port.ReadExisti ng()); }
> else
> {
> textBox1.Text = port.ReadExisti ng();
> }
> }
> }
> }
>
>
> --
> Mike

[ZS]

Hi ,
What is your .net framework version.

I'm trying to develop an application similar to yours and am having trouble.
Is there a namespace System.IO.Ports

-ZS
"Michael Tallhamer" wrote:

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output to a
textBox in my application for viewing. I however keep getting this error and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[Michael Tallhamer]

At the time of this post I was using the beta 2 release but now I am using
the .Net 2.0 Framework. The System.IO.Ports .SerialPort object will handle all
of the serial port communications based on the properties you set up for the
connection.

--
Mike
"ZS" wrote:

Hi ,
What is your .net framework version.

I'm trying to develop an application similar to yours and am having trouble.
Is there a namespace System.IO.Ports

-ZS
"Michael Tallhamer" wrote:

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output to a
textBox in my application for viewing. I however keep getting this error and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike

[ZS]

Is there a way to achieve the same using the 1.1 framework structure.
Thanks for your response.
-Zelma

"Michael Tallhamer" wrote:

I am a medical physicist new to the .Net Framework and am trying to write a
simple app that will monitor the output from a serial port on one of my
linear accelerators using the new Serialport object and write the output to a
textBox in my application for viewing. I however keep getting this error and
am unable to figure out how to get around this.

System.InvalidO perationExcepti on was unhandled
Message="Cross-thread operation not valid: Control 'textBox1' accessed
from a thread other than the thread it was created on."
Source="System. Windows.Forms"

I have attached the code from my simple form for review in the event some
one can help me

Thank You
Michael Tallhamer

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO;
using System.IO.Ports ;

namespace MorningCheckRea der
{
public partial class Form1 : Form
{
// Create the serial port with basic settings
private SerialPort port = new SerialPort("COM 1", 9600, Parity.None,
8,
StopBits.One);

public Form1()
{
InitializeCompo nent();
}

private void button1_Click(o bject sender, EventArgs e)
{
// Attach a method to be called when there is data waiting in
the port's
buffer
port.DataReceiv ed += new SerialDataRecei vedEventHandler

(port_DataRecei ved);

//Open the port
port.Open();
}

private void button2_Click(o bject sender, EventArgs e)
{
port.Close();
}

private void port_DataReceiv ed(object sender,
SerialDataRecei vedEventArgs e)
{

// Show all the incoming data in the port's buffer
if (textBox1.Text. Length > 0)
{
textBox1.Text = textBox1.Text.I nsert(textBox1. Text.Length -
1,

port.ReadExisti ng());
}
else
{
textBox1.Text = port.ReadExisti ng();
}
}
}
}
--
Mike