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From: karlton@fudge.sgi.com (Phil Karlton)
Newsgroups: comp.windows.x
Subject: Re: Inter client communication
Keywords: XClientMessageEvent
Message-ID: <4496@odin.SGI.COM>
Date: 23 Feb 90 19:28:04 GMT
References: <3010@soleil.oakhill.UUCP>
Sender: news@odin.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 36

In article <3010@soleil.oakhill.UUCP> ephrem@oakhill.UUCP (Ephrem Chemaly) writes:
>I would like the data
>collected by this 'collector client' to be sent to other X clients
>to be analyzed, displayed, saved, etc.  I am using the
>XSendEvent(..., XClientMessageEvent) to send the data to all clients
>that registered their interest with the 'collector client'.  This allows
>me to send 20 bytes of data at a time.

There is another way to tackle this particular communication paradigm.
Have the "collecting" client create a window and publish its ID by
hanging a property on the root windo under some private property name,
say "_CHEMALY_PROPERTIES".

Have the collecting client hang properties of an appropriate name and
type on that published window ID. As displayers come and go, have them
select for PropertyNotify on that window. This way the X server takes
care of the registration and shut down for you. Additionally, you can
transfer more than 20 bytes at a time. Be careful of mixing data of
different sizes (8, 16 or 32 bits) within a single property because
this will byte you if you ever run the collector and displayer on
machines with different byte orderings.

If you have more than one set of collectors and displayers then you
will have to have a more complicated initial handshake for
determinating the window to be used.

PK
--
Phil Karlton                            karlton@sgi.com
Silicon Graphics Computer Systems       415-335-1557
2011 N. Shoreline Blvd.
Mountain View, CA 94039
Phil Karlton                            karlton@sgi.com
Silicon Graphics Computer Systems       415-335-1557
2011 N. Shoreline Blvd.
Mountain View, CA 94039