Marshalling updates to a text box - Revision history

68.98.32.163 at 15:09, 29 April 2016

2016-04-29T15:09:30Z

68.98.32.163 at 15:06, 29 April 2016

2016-04-29T15:06:40Z

Rayharwood at 15:55, 24 March 2014

2014-03-24T15:55:40Z

Rayharwood: Created page with "When you have a text box on a form, it's typically created as part of the form's initialization code, in the main thread. If you have a background thread that needs to update..."

2013-02-13T19:26:48Z

Created page with "When you have a text box on a form, it's typically created as part of the form's initialization code, in the main thread. If you have a background thread that needs to update..."

New page

When you have a text box on a form, it's typically created as part of the form's initialization code, in the main thread. If you have a background thread that needs to update the text box, you can't just "pass the text box into the thread", nor can you even respond to an Event in the thread with a handler and "just update the text box" (the event handler runs in the thread of the event).

The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.

@@ Line 3: / Line 3: @@
 The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.
-'''NOTE: This code isn't right either!'''
+    Delegate Sub AddLogtext_Callback(TB As TextBox, Text As String)
      Private Delegate Sub ShowText(Text As String)

← Older revision		Revision as of 15:06, 29 April 2016
Line 2:		Line 2:

	The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.		The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.
		+
		+	'''NOTE: This code isn't right either!'''

	Private Delegate Sub ShowText(Text As String)		Private Delegate Sub ShowText(Text As String)

← Older revision		Revision as of 15:55, 24 March 2014
Line 2:		Line 2:

	The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.		The code isn't difficult to write, but it is ''complex'', in that it's not intuitive nor easy to simply type out when you need it.
		+
		+	Private Delegate Sub ShowText(Text As String)
		+	'
		+	Sub ShowText_Invoke(Text As String)
		+	If tbActionLog.InvokeRequired Then
		+	Dim SHowText_Delegate As New ShowText(AddressOf ShowText_Invoke)
		+	SHowText_Delegate(Text)
		+	Else
		+	tbActionLog.Text &= Format(Now, "hh:mm:ss tt") & " " & Text & vbCrLf
		+	tbActionLog.Select(tbActionLog.TextLength, 1)
		+	tbActionLog.ScrollToCaret()
		+	Application.DoEvents()
		+	End If
		+	End Sub