RE: VB 2005 express

["Paul Smith" <ukha@xxxxxxxxxxxxx>]

Hi Ian,

That's just the job, thanks for it. Out of interest, the xpl
apps, do any of then run as a windows service ? as that's the next bit
of the puzzle for me.


Regards,

Paul


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of Ian Lowe
Sent: 15 December 2005 18:29
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] VB 2005 express

I encountered this same problem when moving some of my xPL code across
to
VB2005 - the UI thread and the background thread are more isolated now:
the
impression I get from reading various articles is that .net was pretty
much
always supposed to be this way, but it was only a warning in the past -
which lead to people taking the chance that it would work 99% of the
time.

Now it's rock solid, you have to use delegates - I declare something
like
this:

Public Delegate Sub SetLabel(ByVal [text] As String)

At the top of the class, then declare this sub in the body:

Private Sub SetLabel(ByVal strNewLbItem As String)
If Me.lblTextLabel.InvokeRequired Then
Dim d As New SetLabel(AddressOf SetLabel)
Me.lblTextLabel.Invoke(d, New Object() {strNewLbItem})
Else
lblTextLabel.Text = strNewLbItem
End If
End Sub

When I would normally just so a straight assignment, I instead do:

Setlabel("somevalue")

It might not be perfect, but it works nicely for me :)

Ian.


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of
Dave Sussman
Sent: 15 December 2005 16:37
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] VB 2005 express

I'm not a winform developer so probably can't help much. However, I do
know
that you can only update the UI from the UI thread, so it sounds like
you've
got a background thread doing the monitoring. If so, you need to use
delegates or the BackgroundWorker component, to marshal the data to be
displayed to the UI. Unfortunately I know nothing about how to actually
implement this, but a quick google should help point you in the right
direction.



d



________________________________

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of
Paul Smith
Sent: 15 December 2005 16:29
To: ukha_d@xxxxxxx
Subject: [ukha_d] VB 2005 express



Hi Guys,



Anyone here using VB 2005, I'm rather new to this. I used
vb6 to build 2 apps which monitor the pins on a serial port to record
the
flashes from my electric meter. However due to a hard disk failure I
have
lost vb6 and all the code I wrote. So I have download vb 2005 express
and am
trying to get this to do the same as I now have a water meter which will
pulse for each litre. I could do with some help as this is a very basic
app
but I get an error which I don't under stand.



With in the event trigger by a pin changing on the serial port should
update
a text box on the form, but I get and error saying I can't do this as
the
thread is not the one the form was created by. Can anyone shed some
light on
this.



I can send over the code it that would help.





Regards,



Paul





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