Get Control From Handle

[jonfroehlich]

I have not yet determined a clean way to invoke code on the UI thread
without access to a Form/Control. The Process class has a property
called "MainWindowHandle," which returns the window handle of the main
window of the associated process. So, for example,
Process.GetCurrentProcess().MainWindowHandle would return a Handle
(HWND) to the main window. But how can we translate a window handle to
a Form?

In .NET 2.0, this is relatively easy, we can simply call
Control.FromHandle(IntPtr handle). Thus, receiving access to the main
window is simply:
(Form)Control.FromHandle(Process.GetCurrentProcess().MainWindowHandle)

Unfortunately, however, .NET CF 2.0 does not expose the
Control.FromHandle method. I have not found anyone on the web who has
solved this problem. Given the limitations of CF, one hacky way to do
this would be to expose a static property on the MainForm class which
would return a reference to itself.

I was wondering if anyone else has come up with a separate solution.
Basically, I need to marshal calls into my UI thread, but I don't want
to pass around a reference to a From/Control.

A few relevant links:

1. https://forums.microsoft.com/MSDN/ShowPost.aspx?
PostID=855352&SiteID=1
2. http://groups.google.com/group/microsoft.public.dotnet.general/
browse_frm/thread/c65f0b7d652c3c3d/a9c80f50dd05af20?
lnk=st&q=MainWindowHandle+Form&rnum=4#a9c80f50dd05af20
3.
http://groups.google.com/group/micr...?lnk=gst&q=FromHandle&rnum=1#3ee2c216071da85b

 

[Peter Foot [MVP]]

If you want to get your own main form, you are probably right, the best way
would be to have a static reference to your form somewhere in your app.

Peter

 

[Neil Cowburn]

You should take a look at using SHChangeNotifyRegister with
SHCNE_MEDIAINSERTED. If you're not comfortable with P/Invoke, drop me a
mail.

--
Neil Cowburn
Principal Partner
OpenNETCF Consulting, LLC.

http://www.opennetcf.com/

 

[jonfroehlich]

Neil,

I'm going to guess that your reply here is meant for a different
thread--it looks like you're answering a question about receiving a
notification when a device's storage card is inserted (I just wanted
to point that out to reduce confusion amongst those more uninformed
readers).

Peter, I was afraid you were going to say that. OK, I'll go ahead and
keep my current solution for now then.