Re: Native exception with asynchronous Tacke-stack

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Chris Tacke, eMVP (ctacke_at_spamfree-opennetcf.org)
Date: 03/22/04 

Date: Mon, 22 Mar 2004 09:36:42 -0500

I've not looked at the code, but if you're using a thread to asynchronously
load the Form that may be a problem. UI changes off the primary thread can
cause problems. 

-- 
Chris Tacke, eMVP
Co-Founder and Advisory Board Member
www.OpenNETCF.org
---
Windows CE Product Manager
Applied Data Systems
www.applieddata.net
".pd." <spam.me@your.peril> wrote in message
news:Xns94B4800B78865spammeyourperil@194.83.179.102...
> Hello,
>
> In an effort to speed up form loading, I modified Chris Tacke's FormStack
> example in these ways:
>
> -- Added 2 ManualResetEvents to the StackForm class - Create and
> InitComp.
> -- Added a ManualResetEvent to the FormStack class - preLoadDone.
> -- Added a Flip method to the FormStack class which would push a form
> onto the stack and pop the previous top one.
> -- Add a bool to the Push() method arg list - if true, form creation is
> done in a thread.  I set the Create event when complete.  Once PreLoad
> has instantiated the form, preLoadDone is set indicating that Push() may
> safely return the address of the new form.
>
> From Main, I push 1 synchronous form on the stack and then push a 2nd
> asynchronous form.
>
> The first form has a button on it whose click event waits for the 2nd's
> form's Create event and then calls the stack Flip method for them to
> change places.
>
> Form2's Load event tries to add a button to itself and there's an
> ArgumentException.  When I try to examine anything in the debugger,
> VS.NET 2003 hangs and I get a NativeException thrown in the PPC 2003
> emulator.
>
> I'm still quite new to all this so I probably am doing something wrong
> but for managed code to be crashing in this way, I can't escape the
> suspicion the bug lies elsewhere.
>
> My short, complete example VS.NET 2003 solution can be downloaded here:
>
>  https://plus.xdrive.com/s/9582618402HPfL3vYgbozwsVuyQQ?partner=plus
>
> And any help would be very much appreciated,
>
> Cheers,
> .pd.

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