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Asked: 2026-05-14T18:19:27+00:00

I’m currently investigating a problem with a 3rd party component (DevExpress) in my application.

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I’m currently investigating a problem with a 3rd party component (DevExpress) in my application.
My issue is quite similar to this one DevExpress KB article. I get the same exception with more less the same stacktrace.
So I used .NET Reflector to find out, what may be null in this scenario, and the only object which is a candiate to be null is Graphics.
This is created with Graphics.FromHwnd(IntPtr.Zero). Because I don’t have a broad knowledge about GDI, I would like to know if somebody can tell me possible scenarios when this may return null…

I tried to reproduce it in a scenario where windows is out of GDI handle’s, but then I’m getting a “out of handles” – exception at least once, which is not the case in the issue I’m investigating

tia,
Martin

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1 Answer

  1. Editorial Team

    From what I recall, an HWND of 0 (effectively IntPtr.Zero) is a handle to the current user session’s desktop. It can be used to measure various metrics of the system and it should be a valid value for Graphics.FromHwnd.

    However, GDI+ is so full of bugs and the .NET integration with it is so unstable it’s very possible there’s nothing wrong with your code or DevExpress other than it just uses GDI+.

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