Windowless ActiveX controls are not supported

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Alfredo Delgadillo - 16 May 2006 21:07 GMT

Hi everybody,

I using VS.NET 2005 Pro to develop win form application and I need include
an activex control to show information, this works good In developing time
but after deploy doesn't work it, I try to running in a clean machine with
framework 2.0 installed

I found this error 'Unable to get the window handle for the 'AxMyActivex'
control. Windowless ActiveX controls are not supported.' when I tray to show
the form with actvex control.

Please, could you someone help me?.

Regards,
Alfredo

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Christian Fröschlin - 17 May 2006 09:43 GMT

> I found this error 'Unable to get the window handle for the 'AxMyActivex'
> control. Windowless ActiveX controls are not supported.' when I tray to show
> the form with actvex control.

Wild shot, but the one time I encountered something like this
it was related to some enhanced virus protection feature of
the CPU (Data Execution Prevention / DEP), in which case it
could be prevented using NoExecute=AlwaysOff in boot.ini.

http://support.microsoft.com/kb/875352

Reply to this Message

Alfredo Delgadillo - 17 May 2006 15:22 GMT

This solution doesn't work for me, this error continues being shown.

I try this options:

1) I set Data Execution Prevention in Advanced properties of my machine to
second option 'Turn on DEP fo all programs and services except I select', and
I add my application, it doesn't work.

2) I was modified boot.ini file changing /noexecute value from
/noexecute=optin to /noexecute=AllwaysOff, it doesn't work too.

do you have any other recomendation?

> Wild shot, but the one time I encountered something like this
> it was related to some enhanced virus protection feature of
> the CPU (Data Execution Prevention / DEP), in which case it
> could be prevented using NoExecute=AlwaysOff in boot.ini.
>
> http://support.microsoft.com/kb/875352

Reply to this Message

The Real Andy - 18 May 2006 10:17 GMT

>Hi everybody,
>
[quoted text clipped - 11 lines]
>Regards,
>Alfredo

I reckon you might be having some threading issues. Try putting all
your calls in a try catch block and see if you get any exceptions.

Reply to this Message

Alfredo Delgadillo - 18 May 2006 13:36 GMT

Hi Andy, this the error detail

|--->Error Type: InvalidOperationException
|--->Rutine: EnsureWindowPresent
|--->Description: Unable to get the window handle for the
'AxctrProject' control. Windowless ActiveX controls are not supported.

Stack Trace:
at System.Windows.Forms.AxHost.EnsureWindowPresent()
at System.Windows.Forms.AxHost.InPlaceActivate()
at System.Windows.Forms.AxHost.TransitionUpTo(Int32 state)
at System.Windows.Forms.AxHost.CreateHandle()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.AxHost.EndInit()
at Name.Detail.TS20.frmForm1.InitializeComponent()
at Name.Detail.TS20.frmForm1..ctor(Boolean blnAll)
at Name.Detail.TS20.frmMain.ExecuteAction(String key, Boolean blnExe)

Each block has a try and cach exception.

> I reckon you might be having some threading issues. Try putting all
> your calls in a try catch block and see if you get any exceptions.

Reply to this Message

The Real Andy - 19 May 2006 09:46 GMT

>Hi Andy, this the error detail
>
[quoted text clipped - 16 lines]
>
>Each block has a try and cach exception.

Without seeing the code, its hard to know what you are doing.

You need to remmeber that the active x control will run on a seperate
thread, and to allow access to the winform thread you need to provide
some kind of thread safe access, typically through invoke.

CAn you get access to VS2003? I beleive the cross threading stuff was
less strictly enforced in 2003.

Reply to this Message

Willy Denoyette [MVP] - 19 May 2006 14:57 GMT

| >Hi Andy, this the error detail
| >
[quoted text clipped - 22 lines]
| thread, and to allow access to the winform thread you need to provide
| some kind of thread safe access, typically through invoke.

Hold on, ActiveX controls must be marked as ThreadingModel= Apartment in the
registry, that is they must run in a STA, assumed that the Form runs in an
STA, the Control also runs in the same STA (same thread).
To the OP, check your controls' apartment requirements.

Willy.

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Windowless ActiveX controls are not supported

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