GDI+ error with Remote Desktop
eXavier
we have problem running WinForm application in Remote Desktop on WinServer
2003. It occasionaly crashes with GDI+ error. We found that someone was
looking for exactly the same issue at this URL
http://discuss.develop.com/archives/wa.exe?A2=ind0507b&L=dotnet-clr&T=0&F=P&P=1079
but without response.
Please could someone help to solve this? Is there any patch for it or known
workaround?
Here's the problem description:
I have a winforms application written in C#. When I'm in a terminal services
session, running the application, occasionally I get
Message: A generic error occurred in GDI+.
Stack Trace: at System.Drawing.Graphics.Clear(Color color) at
Intercerve.Windows.Forms.CalendarRuler.OnPaintBackground(PaintEventArgs
pevent) at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs
e, Int16 layer, Boolean disposeEventArgs) at
System.Windows.Forms.Control.WmPaint(Message& m) at
System.Windows.Forms.Control.WndProc(Message& m) at
System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at
System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at
System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr
wparam, IntPtr lparam)
I've seen this error be raised from other controls as well, and even in
other applications that I know are written on top of the .NET framework, so I
know it's not specific to my application. Its happened on my machine, which
is Windows 2003 SP1, as well as other people's machines, running multiple
different operating systems.
The only common thread is that it seems to happen when in a Terminal
Services session. It also seems to happen if I leave my computer and come
back to the application, and we've had people report it when the application
is minimized then restored within a TS session.
Does anyone have any insight on this issue?
Bryan Phillips
--
Bryan Phillips
MCSD, MCDBA, MCSE
Blog: http://bphillips76.spaces.live.com
"eXavier" <eXa...@community.nospam> wrote in message
news:EB754243-B59D-4BF8...@microsoft.com:
Linda Liu [MSFT]
Based on my understanding, you have a WinForm application on a Windows
Server 2003 machine. When you connect to the Windows Server 2003 machine
from another machine using Remote Desktop Connection and run this
application, the application occasionaly crashes with GDI+ error. If I'm
off base, please feel free to let me know.
To make things clear, I'd like to ask several questions about this issue.
1. If you run the application directly from the Windows Server 2003
machine, does the application crash with GDI+ error?
2. What operation do you perform on the application before the GDI+ error
occurs?
3. Does this problem exist on all machines that connect to the Windows
Server 2003 machine using Remote Desktop Connection?
It's hard to diagnose what the problem is only depending on the general
exception stack information. If possible, could you send me a sample
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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eXavier
1) The application runs well if not running through Remote Desktop (RD).
2) No specific operation - application is active and running without
interaction. Typical scenario is that user switch out of RD window (or
minimalize RD). After switching back in undetermined time(approx 15min) to
RD, the application throws GDI+ exception in Graphics.Clear() at
OnPaintBackground(). Referred control is inherited from
System.Windows.Forms.TabControl and OnPaintBackground method is not overrided.
3) We have observed this problem on all machines with the same symptoms.
Further we have found the same problem reported by someone else in another
newsgroup.
This problem is hard to replicate as we cannot see any specific condition
when this happens - not every swithing window causes the problem. Sometimes
it runs for few hours without crashing, sometimes it crashes in few minutes.
Thanks for your help
eXavier
Linda Liu [MSFT]
Thank you for your prompt reply.
I have searched in our inner database and found a similar issue in it. The
reason why GDI+ error occurs is that GDI+ fail to render to the disconnect
desktop, e.g. secure desktop on a CTRL_ALT_DEL or minimize the terminal
client window.
The behaviour of GDI+ is by design and we could ignore the exception
occurring in this case. To do this, override the
TabControl.OnPaintBackground method and catch the exception in the override
method and then ingore it.
Hope this helps.
If you have anything unclear, please feel free to let me know.
eXavier
Many thanks for your tip. We will try it. As we were under pressure, we
workaorunded the issue by using another commercial control meanwhile. But
thank you anyway.
If GDI+ throws the exception by design, isn't then bug in TabControl itself?
I'm just guessing that it should be catched inside
TabControl.OnPaintBackground()..
Sincerely
eXavier
Linda Liu [MSFT]
Thank you for your prompt response.
According to the document I found in our inner database, it should not be a
bug in either GDI+ or TabControl. How can TabControl know that it is being
used in a terminal session? So, we have to catch the exception by
ourselves.
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