Accessing GUI Thread

07/02/2011 00:01 sarkoplata#1

Hey guys,
I'm having problems with editing my gui,
i use vb.NET and for example i want to add something to my listbox from another thread.
I used a lot of invoke styles but everyone gives me
"BeginInvoke or Invoke cannot be called before window handle has been created."
btw, I have to do a lot changes so it should not sooo long.
I already checked CheckForIllegalCrossThreadCalls = False but it doesnt work =/ Waitin for ur helps..

07/02/2011 02:43 sarkoplata#2

Ok.. now i add some text to my listbox ^^

PHP Code:


			
 Public Shared Sub Log(ByVal oo As Object)
        Application.OpenForms(0).Invoke(New MethodInvoker(Function()
                                                              Main.LogBox.Items.Add("[" & DateTime.Now.ToLongTimeString & "]" & oo)
                                                          End Function))

But when i create same sub for changing a label's text, it doesnt work.

PHP Code:


			
 Public Shared Sub Log(ByVal oo As string , labe as label)
        Application.OpenForms(0).Invoke(New MethodInvoker(Function()
                                                              labe.text=oo
                                                          End Function))

BUT If i create sub with only 1parameter again, no problems ; like this

PHP Code:


			
Public Shared Sub ChangeLabelText(ByVal oo As String)
        Application.OpenForms(0).Invoke(New MethodInvoker(Function()
                                                              Main.NameLabel.Text = oo
                                                          End Function))
    End Sub

So.. will i create the sub again and again for each label?

sarkolata

07/02/2011 19:41 Kraizy#3

PHP Code:


			
//Add a text to any label, for example when clicking a button:
Public Sub Button_Click()
     Log(New Object() {Label1, "myText"})
End Sub

//methods to invoke:
Private Delegate Sub testDel(cLabel as Label, Text as String)

Public Sub Log(params() as Object)
     Me.Invoke(New testDel(AddressOf invokeTest), params(0), params(1))
     //params(0) = Label1
     //params(1) = "myText"
End Sub

Private Sub invokeTest(cLabel as Label, Text as String)
     cLabel.Text = Text
End Sub

But I did not try the code, maybe u will have to change something...