> Thanks for ur response.
> Can u tell me where to find study material about writing a driver to catch
> low-level video calls. ( BTW can I use windows Hooks fro that purpose..
> There may be some kind of messages passing around ).
Window hooks are the method WinVNC uses. They give rough hints as to where
data may have changed on-screen. You end up missing updates and getting
updates where there aren't really any changes. Look up DDML on the
Microsoft site for details on driver level hooking for NT/2K.
> As for Win9x , I assume DDI ( Direct Draw ) helps in creating surfaces
> directly on videoMemory , I didnot get any idea about how to actually
> capture Video Data from Video Card before it goes to Device driver
No, DDI is the Direct Driver Interface, I think. It is a 16-bit API through
which you can get access to the graphics calls before they reach the video
driver. Again, there are details on Microsoft's site.
Cheers,
James "Wez" Weatherall
--
"The path to enlightenment is /usr/bin/enlightenment"
Laboratory for Communications Engineering, Cambridge - Tel : 766513
AT&T Labs Cambridge, UK - Tel : 343000
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