Message Queues

[Neil Stevens]

Hi,

I would like to implements a message queue much like i used to in vb6 as
below:-

dim myMsg as MSG
while (PeekMessage(my Msg, hWnd, 0, 0))
if myMsg.Msg = WM_QUIT Then
End
end if
TranslateMessag e(myMsg)
DispatchMessage (myMsg)
wend
(I know the syntax probably isnt correct)

Is there a way that i can implements something similar to this in VB.NET, i
need to implement this kind of message loop as part of an execution yield, i
dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution.

Could somebody provide some example code of how to do this in VB.NET or
point me to a good resource on the internet.

Thanks in advance
Neil

[Herfried K. Wagner [MVP]]

* "Neil Stevens" <ne**********@b lueyonder.co.uk > scripsit:

I would like to implements a message queue much like i used to in vb6 as
below:-

dim myMsg as MSG
while (PeekMessage(my Msg, hWnd, 0, 0))
if myMsg.Msg = WM_QUIT Then
End
end if
TranslateMessag e(myMsg)
DispatchMessage (myMsg)
wend
(I know the syntax probably isnt correct)

Is there a way that i can implements something similar to this in VB.NET, i
need to implement this kind of message loop as part of an execution yield, i
dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution.

I think you can use the same code in VB.NET, but why do you need that?
Maybe there is a better, managed solution.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Armin Zingler]

"Neil Stevens" <ne**********@b lueyonder.co.uk > schrieb

I hope this makes things a little more clearer, i have other parts of
the code where this type of method is used.

I'd wait for the Documentcomplet e event, then show the form. Or, as the user
wants to know what's going on, I'd show the Form first.
--
Armin

How to quote and why:
http://www.plig.net/nnq/nquote.html
http://www.netmeister.org/news/learn2quote.html

[Armin Zingler]

"Neil Stevens" <ne**********@b lueyonder.co.uk > schrieb

I hope this makes things a little more clearer, i have other parts of
the code where this type of method is used.

I'd wait for the Documentcomplet e event, then show the form. Or, as the user
wants to know what's going on, I'd show the Form first.
--
Armin

How to quote and why:
http://www.plig.net/nnq/nquote.html
http://www.netmeister.org/news/learn2quote.html

[Sin]

> What i have in the application is a form that opens a web document, i have
a

method that sets the document property of the web browser control. The html document has an amount of processing that has to be completed before it can be shown to the user, so the form is hidden the web browser controls
document property is set to the html page and the html page starts
processing itself.

What i have then is a Yield method which processing the message queue so
that the application doesnt lock up while the html document is processing,
when the document is loaded then the method which sets up the document
property can continue to set up the form sizes and finally show the form.

As i said i have had some problems with the DoEvents method and personally
dont like this for of yielding execution, i have found that during a
DoEvents execution pops off to some other part of the application and i want to prevent this until the form has fully loaded and been shown.

I haven't had to work with a similar problem but I suppose you could kick a
thread in which you would assign the url to the web control and then do the
sizing stuff.... All while your mean thread continues to process events...
If you need to prevent mouse/keyboard input while that happens, just disable
the main form at start of thread and re-enable at end of thread...

Would that work?

Alex.

[Sin]

> What i have in the application is a form that opens a web document, i have
a

method that sets the document property of the web browser control. The html document has an amount of processing that has to be completed before it can be shown to the user, so the form is hidden the web browser controls
document property is set to the html page and the html page starts
processing itself.

What i have then is a Yield method which processing the message queue so
that the application doesnt lock up while the html document is processing,
when the document is loaded then the method which sets up the document
property can continue to set up the form sizes and finally show the form.

As i said i have had some problems with the DoEvents method and personally
dont like this for of yielding execution, i have found that during a
DoEvents execution pops off to some other part of the application and i want to prevent this until the form has fully loaded and been shown.

I haven't had to work with a similar problem but I suppose you could kick a
thread in which you would assign the url to the web control and then do the
sizing stuff.... All while your mean thread continues to process events...
If you need to prevent mouse/keyboard input while that happens, just disable
the main form at start of thread and re-enable at end of thread...

Would that work?

Alex.

[Jay B. Harlow [MVP - Outlook]]

Neil,

Is there a way that i can implements something similar to this in VB.NET, i
Yes: System.Windows. Forms.Applicati on.DoEvents

Or use Threads.
dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution. VB.NET is NOT VB6, problems you may or may not have had in VB6 do not
necessarily exist in VB.NET. New runtime, new framework, and sad to say new
problems.
Could somebody provide some example code of how to do this in VB.NET or
point me to a good resource on the internet. My first advice would be not to attempt it: as you are probably causing more
problems then helping in either VB6 or VB.NET, however you can use the same
technique in VB.NET that you used in VB6!

Declare your functions (PeekMessage,Tr anslateMessage, DispatchMessage ) at the
top of your source file & call the them. Remember that Integer is 32bit in
VB.NET while only 16 bit in VB6.

I would seriously look at using a thread rather then some "hack" that may
cause other "hidden" problems...

Hope this helps
Jay

"Neil Stevens" <ne**********@b lueyonder.co.uk > wrote in message
news:uP******** *****@tk2msftng p13.phx.gbl... Hi,

I would like to implements a message queue much like i used to in vb6 as
below:-

dim myMsg as MSG
while (PeekMessage(my Msg, hWnd, 0, 0))
if myMsg.Msg = WM_QUIT Then
End
end if
TranslateMessag e(myMsg)
DispatchMessage (myMsg)
wend
(I know the syntax probably isnt correct)

Is there a way that i can implements something similar to this in VB.NET, i need to implement this kind of message loop as part of an execution yield, i dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution.

Could somebody provide some example code of how to do this in VB.NET or
point me to a good resource on the internet.

Thanks in advance
Neil

[Jay B. Harlow [MVP - Outlook]]

Neil,

Is there a way that i can implements something similar to this in VB.NET, i
Yes: System.Windows. Forms.Applicati on.DoEvents

Or use Threads.
dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution. VB.NET is NOT VB6, problems you may or may not have had in VB6 do not
necessarily exist in VB.NET. New runtime, new framework, and sad to say new
problems.
Could somebody provide some example code of how to do this in VB.NET or
point me to a good resource on the internet. My first advice would be not to attempt it: as you are probably causing more
problems then helping in either VB6 or VB.NET, however you can use the same
technique in VB.NET that you used in VB6!

Declare your functions (PeekMessage,Tr anslateMessage, DispatchMessage ) at the
top of your source file & call the them. Remember that Integer is 32bit in
VB.NET while only 16 bit in VB6.

I would seriously look at using a thread rather then some "hack" that may
cause other "hidden" problems...

Hope this helps
Jay

"Neil Stevens" <ne**********@b lueyonder.co.uk > wrote in message
news:uP******** *****@tk2msftng p13.phx.gbl... Hi,

I would like to implements a message queue much like i used to in vb6 as
below:-

dim myMsg as MSG
while (PeekMessage(my Msg, hWnd, 0, 0))
if myMsg.Msg = WM_QUIT Then
End
end if
TranslateMessag e(myMsg)
DispatchMessage (myMsg)
wend
(I know the syntax probably isnt correct)

Is there a way that i can implements something similar to this in VB.NET, i need to implement this kind of message loop as part of an execution yield, i dont want to use DoEvents() because of the propblems i have had with using
it in the past and this method has proved the best in VB6 for yilding
execution.

Could somebody provide some example code of how to do this in VB.NET or
point me to a good resource on the internet.

Thanks in advance
Neil