Showing some text received from a COM port into a textbox, in VB.NET

[teixeira]

Hi,

 

This is a little about my last post, but i'll ask for help in other terms.

Basically, i've a Terminal that reads the COM port and i'm using VS2005 Team System Beta2 an VB.NET, i'm making all ok about the settings of the serial port and so on but i cannot show the received text into a textbox.

Problem:Cross-Thread.... can not access to the textbox because in a diferent thread...

How can i solve this and show the received text without any problem, i thought o could solve this using the delegates but i was unable to do that ( that was the objective of my last thread ) any help?

 

I saw an example but in C#, that invokes the method AppendText() of the textbox and it was ok but i couldn't solve this in VB.NET.

 

Thanks,

 

Best Regards,

 

Teixeira

[Nate Bross]

You may want to look at this example. http://zone13.net/zone13/default.asp?PageAction=TECHTALK&TechID=539. It uses a class to pass a variable to a thread. You could change the integer value to a 'ByRef' of your textbox like this.

 

'pseudocode
'FORM
Dim MyClass as New ExampleClass(MyTextBox)


'CLASS
'Init
Public TextBox1 as TextBox
Sub New(ByRef tb as TextBox)
   TextBox1 = tb
End Sub

'Use
Sub ThreadProcessLoop()
  do forever
       TextBox1.Text &= MyValueMadeInThisThread
  loop
End SUb