Creating Forms in a Callback

[Dennis Burns]

I've posted this question before, and since then I've tried a variety of
work-arounds, with no success. So, here goes again...

I'd like to create forms and open them from within a callback function
in managed code. To be more specific, when I connect my USB device, I'd
like the driver, implemented in unmanaged code, to call a callback in
managed.
I have the callback working, but when I try to create and open a new
form to interface with this device, the form starts to open but turns
all white. Then I get an hour-glass of death. I have to stop the app to
recover.

Note that if I use the OpenDialog instead of the Open form method, then
the form opens ok, but this is not acceptable. I need the form to stay
open. I may have multiple USB devices connected.

Any help?

Thanks in advance for the help,
Best Regards,
Dennis

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[Willy Denoyette [MVP]]

If you are really sure you want to run UI stuff on the non main UI thread,
you have to consider that all UI threads needs:
- to pump messages,
A message pump is created by calling Application.Run, so you need to
call Application.Run(...) passing a reference to your form as argument.
- need an STA to run on.
Your callback runs on a threadpool thread which is by default MTA
initialized , so you need to start another thread from the callback set the
thread apartment to STA and start the message pump on this thread.
- non UI threads needs to pass messages to the right UI thread when touching
UI interface elements.
Willy.

"Dennis Burns" <db****@rtessentials.com> wrote in message
news:eD**************@TK2MSFTNGP10.phx.gbl...

I've posted this question before, and since then I've tried a variety of
work-arounds, with no success. So, here goes again...

I'd like to create forms and open them from within a callback function
in managed code. To be more specific, when I connect my USB device, I'd
like the driver, implemented in unmanaged code, to call a callback in
managed.
I have the callback working, but when I try to create and open a new
form to interface with this device, the form starts to open but turns
all white. Then I get an hour-glass of death. I have to stop the app to
recover.

Note that if I use the OpenDialog instead of the Open form method, then
the form opens ok, but this is not acceptable. I need the form to stay
open. I may have multiple USB devices connected.

Any help?

Thanks in advance for the help,
Best Regards,
Dennis

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!