xwinclip re selection polling

[Jehan]

I think the goal in the not-too-far-away-future is to have xwinclip 
integrated directly inside the XWin app. This would save you the trouble 
to use SetWindowsHookEx, which IIRC is a big piece of crap. Also, this 
would save you the trouble of killing xwinclip while XWin is still running.

	Jehan

Chris Twiner wrote:
> Hi All,
> 
> I posted last week that I had a possible solution to the xwinclip 
> selection behaviour.  I didn't get any feedback so I endeavoured to do 
> it anyway.  So this ones a bit long but it's an explanation of how I've 
> got it working ..
> 
> Basic premise :
> 
> Use a seperate dll that runs a system wide Windoze hook to catch all 
> activate messages.  2 events are of interest in the hook, when 
> Cygwin/XFree86 is activated and when it is deactivated.  When an event 
> is detected the hook then sends a broadcast registered message to all 
> top level windows.
> 
> The top level Windoze window for xwinclip is run in a seperate thread 
> and as such always receives the messages.  Upon receipt of the 
> activation messages flags are set up that indicate that either 
> xtowindows be called or windowstox.  These functions copy the data in 
> the respective directions.
> 
> The flags have to be used so the main thread (the owner of pDisplay) is 
> the one that calls the functions.  They in turn either 
> XSetSelectionOwner (windowstox) or they XConvertSelection (xtowindows) 
> to set the messages running.
> 
> Major changes are that the select in xwinclip.c has a time limit applied 
> and that the XSetSelectionOwner in xevents.c and XSetSelectionOwner in 
> xwinclip.c are removed.
> 
> This means that all selection operations behave as expected in XWin with 
> xwinclip running.
> 
> However I have some limitations:
> 
> closing xwinclip:
>   closing XWin closes xwinclip but doesn't go through WM_DESTROY on the 
> x window, just
> XIO:  fatal IO error 113 (Connection aborted) on X server "127.0.0.1:0.0"
>      after 48 requests (47 known processed) with 0 events remaining.
>   I made a script to close xwinclip via sending an X message but it 
> results in crashing XWin as well.
> 
> the select statement timeout:
>   In order to get the polling on the notification flags (from the 
> windows thread) the timer is set to 1 sec (or some other time).  Is 
> there a way to make the flags act as file descriptors for the select 
> statement?
> 
> Any help on the problems would be appreciated.
> 
> The code is still (cough cough) a little rough n ready so I will release 
> it when appropriate.  Is putting a zip attachment on this mailing list 
> appropriate?
> 
> I have only been working on this for 3 days and it's my first attempt at 
> X antics so if these are FAQ style items I appologise (I've looked just 
> can't find them).
> 
> Regards,
> 
> Chris Twiner
> 
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