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 adapterŽs frame
buffer and compares it with the image the should be actually displayed. My
question now is: WhatŽs 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

[c***@googlemail.com]

Post by 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