[2005] updating ToolStripStatusLabel1 from a 2nd form

[Glenozzy]

Hi Guys

I have 2 forms.

Main_form has a StatusStrip1 with ToolStripStatusLabel1 I would like to update this label with lat and Long information

GPS form contains the serial port and all the GPS information
when ever I get a new GPS message I call public sub Update_status_bar
located in main_form

I don't get any errors but no data in the ToolStripStatusLabel1


Public Sub update_status_bar()

Dim temp As String

temp = Lat_Dec & " " & Long_Dec
SetTextBoxText(temp)

End Sub

Public Delegate Sub SetTextBoxTextDelegate(ByVal text As String)

public Sub SetTextBoxText(ByVal text As String)

If Me.StatusStrip1.InvokeRequired Then
'This is a worker thread so create a delegate to cross the thread boundary.
Me.StatusStrip1.Invoke(New SetTextBoxTextDelegate(AddressOf SetTextBoxText), ToolStripStatusLabel1.Text = text)
Else
'This is the UI thread so access the control's members directly.
Me.ToolStripStatusLabel1.Text = text

End If
Me.StatusStrip1.Refresh()

End Sub

any Ideas?

[Aspnot]

My guess is that you are just calling Update_Status_Bar and not using a reference to your existing instance of Main_form. I would suggest that you create a Property in the 2nd form called MyParent and before you Show the 2nd form, pass in the reference to Main_form.

For Example:
Main_form code

Dim frm as New frmSecondForm
 
    With frm
        .MyParent = Me
        .ShowDialog()
        .Dispose()
    End With

frmSecondForm code

Private _MyParent As Form
 
    Private WriteOnly Property MyParent() As Form
        Set(ByVal value As Form)
            _MyParent = value
        End Set
    End Property
 
    Private Sub UpdateParentStatus()
        _MyParent.ToolStripStatusLabel1.Text = Lat_Dec & " " & Long_Dec
    End Sub

[Glenozzy]

Main_Form Call

Private Sub GPSToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GPSToolStripMenuItem.Click

Dim frm As New GPS
With frm
.MyParent = Me
.ShowDialog()
.Dispose()
End With

GPS.Visible = True

End Sub

If I enter the code like this I get the following error

Public _MyParent As Main_Form

Public WriteOnly Property MyParent() As Form
Set(ByVal value As Form)
_MyParent = value
End Set
End Property

Private Sub UpdateParentStatus()
_MyParent.ToolStripStatusLabel1.Text = "Messages Received Acquiring"


End Sub

A first chance exception of type 'System.NullReferenceException' occurred in NO_Name1.exe



Public _MyParent As Form

Public WriteOnly Property MyParent() As Form
Set(ByVal value As Form)
_MyParent = value
End Set
End Property

Private Sub UpdateParentStatus()
_MyParent.ToolStripStatusLabel1.Text = "Messages Received Acquiring GPS"


End Sub


and on this way I get ToolStripStatusLabel1 is not a member