microsoft.public.dotnet.framework.interop

Vitaly

5/17/2007 1:53:00 PM

Microsoft says that ActiveX can run in the thread with STA parameter (by
default a thread is started as MTA). Check your code in what thread type
you
start your activex.


"jhamers" <jhamers@gmail.com> wrote in message
news:1179210228.692127.53330@u30g2000hsc.googlegroups.com...
> Hi,
>
> I'm using a ATL ActiveX on a C# windows form (Visual studio 2005).
> That works great. However, I wanted to create a C# user control which
> would wrap this ActiveX. Therefore I created an empty user control and
> just put this ActiveX on it. No problem so far.
>
> However, when I wanted to test this dummy User Control, I put this
> user control on its turn on a c# form.
> That's when it started to go wrong. Once it is put on the form, I can
> not move it anymore and when I click in the user control I get an
> error saying that an unhandled exception caused the designer to crash.
> In the activex there is a stack trace displayed:
> ..UnsafeNativeMethods.IOleInplace.UIDeactivate
> at ...AxHost.UiDeactivate
> at....AxHost.OnLostFocus...
>
> I hooked up an instance of Visual studio 2003 to debug the Visual
> studio 2005.
> And it seems it is going wrong in the
> ::SetFocus call in SetControlFocus(TRUE) which is called from
> CComControlBase::InPlaceActivate(LONG iVerb, const RECT* /
> *prcPosRect*/) in atlctl.h
>
> Anybody any ideas why an activex is making the designer go bananas
> like this? And how to prevent it?
>
> Kind Regards,
> Jeroen
>



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