[Openmcl-devel] is (pref *display* ...) supposed to work?

Timothy MOORE Timothy.Moore at labri.fr
Wed Dec 17 18:35:04 UTC 2003


On Dec 17, 2003, at 1:10 PM, Gary Byers wrote:
> (ccl::%get-signed-long *display* (/ N 8))
>
>
Actually, it expanded to:
(%GET-SIGNED-LONG (%GET-PTR *DISPLAY* (/ 0 8)) (/ 1056 8))
which is an important clue.
> where N is the bit offset of the "default_screen" field in an
> _XPrivDisplay structure.  There are a few dozen fields that
> precede "default_screen" in an _XPrivDisplay, so N could/should
> be in the high hundreds/low thousands and N/8 should be in the
> high dozens/low hundreds somewhere.
>
It turns out that _XPrivDisplay is a "pointer-to-struct" type, which is 
obviously confusing things. I ran the X header files through ffigen 
again with -DXLIB_ILLEGAL_ACCESS, so "Display" is now a valid structure 
type. Things are working better now.

A quick question: the offset to %get-signed-long and friends is in 
bytes; how about the array length in (make-record (:array int 42))?

Thanks,
Tim




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