I may be outside the UI thread

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David Thielen - 05 Sep 2007 17:14 GMT

Hi;

I am getting an exception calling ShowWindow() sometimes and I am wondoering
if I am outside the UI thread in that case. Here is what I am doing:

Create a dialog with:
using (SpawnReport dlg = new SpawnReport(app, ext))
{
    dlg.ShowDialog();
}

In the constructor for this dialog (Form actually) I have:
    this.Activated += new System.EventHandler(this.Report_Activated);

I assume that Report_Activated is called in the UI thread - is this correct?

Inside Report_Activated I call:
    BeginInvoke(new LaunchDelegate(LaunchReport));

I assume LaunchReport is called in the context of the UI thread. Is this
correct?
And LaunchReport calls Close() as it's last line of code - is this ok?
And in LaunchReport it calls Update(); Application.DoEvents(); when it is
updating the status Label in the Form - is this ok?

This all seems right to me but I may be missing a possible thread context
switch.

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

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Linda Liu [MSFT] - 06 Sep 2007 11:43 GMT

Hi Dave,

> I am getting an exception calling ShowWindow() sometimes

What's the exception do you get?

> I assume that Report_Activated is called in the UI thread - is this correct?

Yes, the Report_Activated handler is called in the UI thread.

> I assume LaunchReport is called in the context of the UI thread. Is this

correct?
Yes.

> And LaunchReport calls Close() as it's last line of code - is this ok?

What the object do you call the Close method on?

> And in LaunchReport it calls Update(); Application.DoEvents(); when it is

updating the status Label in the Form - is this ok?
Yes, it should be ok.

If possible, could you please send me a simple project that could just
reproduce the problem? To get my actual email address, remove 'online' from
my displayed email address.

Sincerely,
Linda Liu
Microsoft Online Community Support

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David Thielen - 06 Sep 2007 17:58 GMT

Hi;

The problem is we do not get the bug here. We have 1 user getting it and she
gets it intermittently. Mostly she gets a message "Word experienced a serious
problem with the 'windward autotag 2007' add-in...

Or it throws an exception "External component has thrown an exception."
inside a method like (the method throwing it changes)
System.Drawing.SafeNativeMethods.Gdip.GdipMeasureString.

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

> Hi Dave,
>
[quoted text clipped - 43 lines]
>
> This posting is provided "AS IS" with no warranties, and confers no rights.

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Walter Wang [MSFT] - 10 Sep 2007 13:26 GMT

Hi Dave,

I hope you could understand that for such intermit error, there's really
not much we can do from newsgroup. You may contact Microsoft Customer
Support and Service for further help. Thanks for your understanding.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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David Thielen - 10 Sep 2007 18:30 GMT

I was afraid of that. I wrote in case I made a bad assumption about always
being in the UI thread in each of the event handlers.

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

> Hi Dave,
>
[quoted text clipped - 12 lines]
>
> This posting is provided "AS IS" with no warranties, and confers no rights.

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Ben Voigt [C++ MVP] - 11 Sep 2007 01:57 GMT

>I was afraid of that. I wrote in case I made a bad assumption about always
> being in the UI thread in each of the event handlers.

Best thing to do is install a global exception handler that writes the
exception details to a log file (along with thread id).

>> Hi Dave,
>>
[quoted text clipped - 13 lines]
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.

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David Thielen - 11 Sep 2007 04:02 GMT

Hi;

I can't - this is for a Word AddIn so it owns the app - we're just a dll it
calls.

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

> >I was afraid of that. I wrote in case I made a bad assumption about always
> > being in the UI thread in each of the event handlers.
[quoted text clipped - 19 lines]
> >> This posting is provided "AS IS" with no warranties, and confers no
> >> rights.

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I may be outside the UI thread

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