How to read out the frame buffer of graphic adapter / mini port

[Thomas Zeman]

Hi!

I am writing visual components for industrial devices like virtual voltage
meters or similar things. A problem I encountered there is when my window
(XPe) hangs for any reason and the virtual devices arent updated any longer.
A human sees wrong values then what renders the whole system unusable since
heavy accidents could occur. Therefore I want to try to develop another
"surveillance" application which reads out the graphic adapter愀 frame
buffer and compares it with the image the should be actually displayed. My
question now is: What愀 the most reliable way to do that? Is a GDI
screenshot enough or how deep can I go there? asking the display driver
directly? Is there an unified interface for that?

Many thanks in advance
Thomas

[cir...@googlemail.com]

Am Mittwoch, 19. Januar 2005 11:15:16 UTC+1 schrieb Thomas Zeman:
> Hi!
>
> I am writing visual components for industrial devices like virtual voltage
> meters or similar things. A problem I encountered there is when my window
> (XPe) hangs for any reason and the virtual devices arent updated any longer.
> A human sees wrong values then what renders the whole system unusable since
> heavy accidents could occur. Therefore I want to try to develop another

> "surveillance" application which reads out the graphic adapter´s frame

> buffer and compares it with the image the should be actually displayed. My

> question now is: What´s the most reliable way to do that? Is a GDI

> screenshot enough or how deep can I go there? asking the display driver
> directly? Is there an unified interface for that?
>
> Many thanks in advance
> Thomas

I can't help you with that, but anyway, you can e-mail me at this address. :-)
Cirko