MBR IT/.NET 247 : ASYNC SOCKET and FREEZE on microsoft.public.dotnet.framework.compactframework

ASYNC SOCKET and FREEZE

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brandon kim

i have implemented socket(async) program with pocketpc 2003
and vb.net.

After PDA received a message from server, program show
this message on MenuItem in Form. but when message is
written on MenuItem, program freeze without any error msg
i really don't know why.

i spent almost a week and get no result.

please help!
following is brief of my code

thanks in advance...

+++++clsSocket.readFromServer++++++++++++++++++++++++++
+ receive message and raise event to handle message
+ in mainForm
+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Public Sub readFromServer(ByVal ar As IAsyncResult)
Dim BytesRead As Integer
Dim strMessage As String
Dim intStart As Integer
Dim intEnd As Integer

If bSocketEnd Then
Exit Sub
End If

Try
BytesRead = pdaClient.GetStream.EndRead(ar)
pdaClient.GetStream.Flush()

If BytesRead < 1 Then

msgbox("serverend")
Exit Sub
End If

strMessage = Encoding.ASCII.GetString(readBuffer, 0,
BytesRead)

RaiseEvent recvMsgEvent(strMessage)

'Start a new asynchronous read into readBuffer
pdaClient.GetStream.BeginRead(readBuffer, 0, _
READ_BUFFER_SIZE, AddressOf readFromServer,
Nothing)

Catch e As Exception

msgbox(e.ToString)

End Try
End Sub

+++++mainForm.processMsg+++++++++++++++++++++++++++++++
+ receive message EventHandler
+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Public Sub processMsg(ByVal strMessage As String)
Dim strTemp As String = "what's going on...."

clsCommon.insertListView(lvwResult, strMessage)

'*****FREEZE HERE*************************
MenuItem1.Text = strTemp
'*****************************************

Thread.CurrentThread.Sleep(50)
Application.DoEvents()

txtResult.Text = strMessage
End Sub

Reply to this message...

Alex Yakhnin [MVP] (VIP)

The async. sockets are executed on the separate thread.
This is why the update of the UI thread is failing. You
must use Control.Invoke if you don't want to have any
problems.

http://msdn.microsoft.com/library/default.asp?
url=/library/en-us/dnnetcomp/html/netcfmultithreadedapp.asp

--
Alex Yakhnin, .NET CF MVP
http://www.intelliprog.com
blog: http://blog.opennetcf.org/ayakhnin

[Original message clipped]

Reply to this message...

	System.EventHandler
	System.IAsyncResult
	System.Text.Encoding
	System.Threading.Thread
	System.Web.UI.Control
	System.Windows.Forms.Application
	System.Windows.Forms.MenuItem

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