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Pause execution of code like msgbox

Posted on 2008-06-20
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Last Modified: 2013-11-06
Hi
I would like to pause execution of a script while waiting for another thread to complete. I can't use threading.thread.sleep(xxx) because it sows the script down. What I'm looking for is something that pauses the script the same way a messagebox does:


While Encoder.RunState <> WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPED
            Me.ToolStripStatusLabel1.Text = "...Waiting for response"
            MsgBox("test")
  End While

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Question by:koldstar
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7 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 21834135
you have to test for the other thread's .IsAlive property
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Author Comment

by:koldstar
ID: 21834169
can you explain how to?

I'm not making the tread my self, but it's Microsofts wmencoder that is creating a new thread every time you call the start function.

The above code is in my main thread.
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Expert Comment

by:Jaime Olivares
ID: 21834207
Well, that depends if you have a way to obtain this thread's reference, some code snippet will be helpful
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Author Comment

by:koldstar
ID: 21834278
Try something like this:

The sub, encodeAll loops throug a collection of songs. If I don't pause the encoding it starts a new thread for every song witch causes an out of memory exception
Dim WithEvents Encoder As WMEncoder
 
private sub EncodeSong(byval songname as string)
 
 	Encoder = New WMEncoder
 
	'do some stuff with the encoder
	'code removed
	'code removed
 
	Encoder.AutoStop = True
	Encoder.RemoteAdmin = True
     
	Encoder.PrepareToEncode(True)
 
	'start encoding (start a new thread)          
	Encoder.Start()
           
	'pause until process is done
	While Encoder.RunState <> WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPED
      		Me.ToolStripStatusLabel1.Text = "...Venter på svar!"
      		MsgBox("test")
	End While
end sub
 
private sub encodeAll()
 
	for each song in song
		EncodeSong(song.path)
	next
 
 
end sub

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Author Comment

by:koldstar
ID: 21834287

private sub encodeAll() 
	for each song in songs
		EncodeSong(song.path)
	next
 end sub

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Accepted Solution

by:
Jaime Olivares earned 500 total points
ID: 21834454
I don't know exactly what you need, do you want to show a messagebox while playing? and hide it after play? You can do something like this:

' Assuming you desing a WaitForm with a message
Dim form as WaitForm = new WaitForm
form.Show()
Me.ToolStripStatusLabel1.Text = "...Venter på svar!"
While Encoder.RunState <> WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPED
                  Application.DoEvents()  'avoid the application to freeze
End While
form.Hide()
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Author Comment

by:koldstar
ID: 21834609
No I was trying to get rid of the messagebox. I just wanted something to stop the code, but the Application.DoEvents()  seems to do just fine. thanks :_)
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