Asynchronous Process

[Guest]

Hi

I used asynchronous process with a delegate in vb.net. Sometime the callback couldn't terminate successfully, except when a msgbox was used to interrupt it. Anybody has an ideal

Thank

 

[tim]

hello, attaching some code would be useful...
are you saying the callback wouldn't fire, or
an exception is thrown in the callback method?

 

[Guest]

Tim

Callback is running correctly, i.e. no exception. But couldn't complete. The process is described as follows

1. Open a message window asynchronously
2. Do some tasks
3. Close the message window by callback. (couldn't

If I added a msgbox into callback process, then step 3 is okay. I think this is relative to thread issue

Li Pan

 

[Alexandre Moura]

I'm not entirely sure about this, but I believe that callbacks require your
app to have a message loop running (using msgbox automatically creates one
in the background) - try adding one to your app (you will need to create a
thread to run it):

'this will create a message loop - note that the method call to Run never
returns, so we need to call it in a seperate thread
Sub MsgLoop()
Windows.Forms.Application.Run()
End Sub

'Add this code to your initialization code:
Dim th As New Threading.Thread(AddressOf MsgLoop)
th.Start()

Hope that helps.
Alex

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Tim,

Callback is running correctly, i.e. no exception. But couldn't complete.
The process is described as follows:

1. Open a message window asynchronously.
2. Do some tasks.
3. Close the message window by callback. (couldn't)

If I added a msgbox into callback process, then step 3 is okay. I think
this is relative to thread issue.

Li Pang