[Xcb] ANNOUNCE: X Haskell Bindings 0.3

Barton C Massey bart at cs.pdx.edu
Mon Jun 29 23:40:00 PDT 2009


OK, XCB should be able to support what you want, I think.  I
will try to bug Jamey and Josh sometime soon and we can help
you work out the rest of the details.

	Bart

In message <694519c50906291007o2805ee83v9af941d78cbaa485 at mail.gmail.com> you wrote:
> On Mon, Jun 29, 2009 at 10:39 AM, Barton C Massey<bart at cs.pdx.edu> wrote:
> >
> > The suggested approach, as I think you understand, is to
> > bind to the XCB bottom-half. =A0You can use the socket handoff
> > mechanism, which allows you to continue to generate the
> > protocol stream using your current code, while allowing
> > folks to integrate Xlib and C/XCB code into XHSB apps.
> >
> > One thing really lacking in XCB right now is adequate
> > documentation for this interface. =A0We've been talking about
> > what to do about that.
> >
> 
> The interface in xcbext.h looks a lot more convenient for sending out
> my own requests (specifically xcb_send_request).
> 
> It looks like if I go through that interface, libxcb will still be
> taking care of a lot of the lower-level details, and I don't need to
> worry about the socket-handoff.
> 
> If I go through the socket-handoff API it isn't clear to me how I
> would send checked requests. And it looks like xcb_send_request is the
> place where we handle the needs for "quirky" requests.
> 
> The plan would be to take the higher-level Haskell data-structres,
> write them out to bytes, and then send them off to xcb_send_request.
> 
> Then I would take the bytes from xcb_wait_for_event, xcb_request_check
> and xcb_wait_for_reply and pass them off to my Haskell deserialization
> functions.
> 
> The only wrinkles are
>  - The extended sequemce that libxcb inserts sometimes when pulling
> bytes off the wire
>  - Figuring out the mapping from event/error numbers to the extension
> which produced it - since the Haskell code doesn't own the extension
> cache anymore, this could be tricky.
> 
> Antoine


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