Re: Delegate.BeginInvoke and EndInvoke.

I think I incorrectly passed in the wrong param for uiParam. I am
passing in .cbSize and the example on Pinvoke.net has it being 0..
(although I could have sworn that pinvoke.net is where I originally got
my sample from!)..

could this cause the hang?

-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps
and controls [mailto:[email protected]] On Behalf Of
Bhatnagar, Amit
Sent: Wednesday, January 16, 2008 3:29 PM
To: [email protected]
Subject: Re: [DOTNET-WINFORMS] Delegate.BeginInvoke and EndInvoke.

Here is the relevant code snippets, like I said, this works most of the
time, but sometimes it hangs.

           // The SPI_GETNONCLIENTMETRICS call only gets called once at
initialization,
         // setting the touch screen size and hanging on to them.=20

         m_standardNonClientMetrics =3D new NONCLIENTMETRICS();

         m_standardNonClientMetrics.cbSize =3D=20
            Marshal.SizeOf(typeof(NONCLIENTMETRICS));

         bool result =3D SystemParametersInfo(SPI_GETNONCLIENTMETRICS,=20
=20
m_standardNonClientMetrics.cbSize,=20
                                            ref
m_standardNonClientMetrics,=20
                                            0);   =20

         m_standardNonClientMetrics.scrollHeight =3D SCROLLBAR_HEIGHT;
         m_standardNonClientMetrics.scrollWidth  =3D SCROLLBAR_WIDTH;

         m_touchScreenNonClientMetrics =3D new NONCLIENTMETRICS();
         m_touchScreenNonClientMetrics =3D m_standardNonClientMetrics;

         m_touchScreenNonClientMetrics.scrollWidth  =3D
TS_SCROLLBAR_WIDTH;
         m_touchScreenNonClientMetrics.scrollHeight =3D
TS_SCROLLBAR_HEIGHT;


                // Increase the size of the scrollbars here.
            result =3D=20
               SystemParametersInfo(SPI_SETNONCLIENTMETRICS,=20
=20
m_touchScreenNonClientMetrics.cbSize,=20
                                    ref m_touchScreenNonClientMetrics,=20
                                    0);
=20

-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps
and controls [mailto:[email protected]] On Behalf Of
Peter Ritchie
Sent: Wednesday, January 16, 2008 3:08 PM
To: [email protected]
Subject: Re: [DOTNET-WINFORMS] Delegate.BeginInvoke and EndInvoke.

On Wed, 16 Jan 2008 10:12:22 +0100, Fabian Schmied
<[email protected]>
wrote:
>(As a side note, I don't really know much about SystemParametersInfo,=20
>but maybe you should ask at a Win32 forum as well - somebody might have

>had this issue before. There's also this posting by Raymond Chen:
>http://blogs.msdn.com/oldnewthing/archive/2005/03/10/392118.aspx - he=20
>also talks about the WM_SETTINGCHANGE message; but it doesn't have to=20
>be your own window that is blocking, it might be a different one.)

Amit mentioned that he wasn't using the flag that causes the send of
WM_SETTINGCHANGE; so I can see no reason why it would hang...  Seeing
the code might be useful...

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