multi threading error

[iwdu15]

hi, im writing a program with multiple threads, and in one of the secondary
threads, i need to access the main form...but the code i wrote throws errors
saying i cant do this. is there anyway i can simply change the text on the
main form from another thread?

my code:

Private Sub ListenBegin()

Try

Dim ep As IPEndPoint

HomeIP = Net.Dns.GetHost Entry(Net.Dns.G etHostName).Add ressList(0)

ep = New IPEndPoint(Home IP, PortNumber)

ListenSocket = New Socket(AddressF amily.InterNetw ork,
SocketType.Stre am, ProtocolType.Tc p)

ListenSocket.Bi nd(ep)
ListenSocket.Li sten(1)
ListenSocket.Be ginAccept(Addre ssOf ListenCallBack, Nothing)

Catch ex As Exception

Call WriteErrors(ex. Message, "ListenBegi n")

Finally

SyncLock Me

''error here
Me.Text = HomeIP.ToString

End SyncLock

End Try

End Sub
--
-iwdu15

[Larry Lard]

Re: multi threading error


iwdu15 wrote:[color=blue]
> hi, im writing a program with multiple threads, and in one of the secondary
> threads, i need to access the main form...but the code i wrote throws errors
> saying i cant do this. is there anyway i can simply change the text on the
> main form from another thread?[/color]

Short answer: Never invoke any method or property on a control created
on another thread

Background reading:
<http://yoda.arachsys.c om/csharp/threads/winforms.shtml>

Quick fix: change

SyncLock Me
Me.Text = HomeIP.ToString
End SyncLock

to

Me.Invoke(New StringParameter Delegate(Addres sOf TextSetter), _
New Object() {HomeIP.ToStrin g})

add

Delegate Sub StringParameter Delegate(ByVal value As String)

at form level

and add

Private Sub TextSetter(ByVa l value As String)
Me.Text = value
End Sub

--
Larry Lard

[iwdu15]

Re: multi threading error

thanks for the info, il keep that in mind! also thanks for the quick
response, it works great
--
-iwdu15