Serial Port Communication

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Hi I am reading data from a serial port on the data received event of the serial port.

I define and open port on form load.

i can see the data and the program works when published but when debugging i get the following error :

Cross-thread operation not valid

at the following row (rTxtMass.AppendText(SPScale.ReadLine());)

rTxtMass is a richtextbox

C#

private void SPScale_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    rTxtMass.AppendText(SPScale.ReadLine());
}

Is it realy necessary to create a thread just to read data from a serial port?
The software package is only a remote display of a scale so security is not an issue.

Posted 21-Jul-14 23:04pm

Dr Drastic

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OriginalGriff · Accepted Answer · 2014-07-21T23:07:00

Solution 1

"Is it really necessary to create a thread just to read data from a serial port?"

No, you don't have to - but the system does.
The DataRecieved event is always on a different (non-UI) thread, which is why you get the Cross thread problem. All you have to do is Invoke it: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.invoke(v=vs.110).aspx[^]

Posted 21-Jul-14 23:07pm

OriginalGriff

Comments

Dr Drastic 22-Jul-14 9:43am

Thanks OriginalGriff,

Will implement the invoke.

OriginalGriff 22-Jul-14 9:59am

You're welcome!

Dr Drastic 22-Jul-14 10:16am

I Just Implemented the invoke and it works perfectly!

OriginalGriff 22-Jul-14 10:26am

:thumbsup:!