On Mon, 29 Aug 2005, Colin Western wrote:
> Michael Van Canneyt wrote:
>
> > On Mon, 29 Aug 2005, Colin Western wrote:
> >
> >
> >
> > > I think that on Linux/unix you should use the X windows message
> > > passing, so
> > > that you can talk between programs running on different machines. I
> > > have had a
> > > stab at this in the past, and I attach a draft version. Though not
> > > shown in
> > > the attached, under MS windows I used
> > > RegisterWindowMessage('SpecialName');
> > > and looked for this specific message in the appropriate wndproc (or it
> > > could
> > > be the overall message loop)
> > >
> > >
> >
> > This is only suitable for 2 processes running on the same desktop:
> >
> >
> >
> It is indeed only suitable for two processes using the same X server, but on
> the other hand the X system
> is the only way you can guarantee that such processes can talk to each other
> because that is the only thing you know they have in common. If the programs
> are running on different machines then no other connection may be possible.
>
> > It is not suitable for a daemon; you cannot expect X to be present.
> > I have servers without X installed.
> >
> >
> Indeed - I was assuming this was for the LCL which assumes a display of some
> sort (given that message loops were being discussed). Something like sockets
> sounds the right idea here.
Well, you can also make daemon or CGI apps in Lazarus.
The LCL is just the visual part. I want something that
also works non-visual.
>
> > It also means you cannot connect to a process which is running as another
> > user on a different desktop, e.g. a VNC client.
> >
> >
> Also true, though in this case you would have to explictly specify the remote
> host as part of the connection.
>
> I think we have two slightly different applictions in mind - Would something
> like the Indy stuff be right for your daemons?
That is already way too complicated.
Anyway, I have it mostly set up. The good thing is that i've made the
transport pluggable. It works currently with pipes on Linux, but you could
easily change it to X-Window messages or whatever transport you want.
As soon as I did some tests I'll post the code with sample projects.
(both visual and non-visual)
Michael.
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