Re: [wxCode-users] wxDNSSD

[Ishan A. <ish...@us...>]

Thanks. The sample is of great help

On 12/20/06, William H. Schultz <whs...@ce...> wrote:
>
> I see.  That makes more sense--that it would be source-code compatible,
> similar to WINE.  That would relieve the effort of implementation quite a
> bit.
> While it may be a while before I get around to writing serious
> documentation, I can at least go ahead and put some effort into squeezing
> this into the existing socket sample.  That should help get you up and
> running.
>
>   -------------------------------
> Hank Schultz
> Cedrus Corporation
> http://www.cedrus.com /
>
>
> On Dec 18, 2006, at 7:01 PM, Ishan Arora wrote:
>
> William,
> What I insisted in last post was " Avahi also implements binary
> compatibility libraries that emulate Bonjour and Howl". I guess I should have
> used a different font :)
> Since Avahi sounds more native and also emulates Bonjour in different
> binaries, you wont have to modify your code (much). Moreover it comes
> installed with most linux; we don't have much reason to give a Linux user
> the trouble of installing Bonjour
>
>
> On 12/19/06, William H. Schultz <whs...@ce... > wrote:
> >
> > It isn't visible straight from wxCode because I'm using wxCode's
> > subversion repository instead of the CVS repository.  This allowed me to
> > point to it as an external source within our own internal project's svn
> > repo.  I also haven't packaged up a release, as I have no documentation or
> > anything to help people build a project.
> > About Avahi, if that's what is commonly shipping on Linux systems, then
> > that would probably be the better route to take on those platforms.  As
> > currently implemented, wxDNSSD relies on Apple's implementation.  I imagine
> > Avahi wouldn't be particularly difficult to implement into my existing
> > framework.  I suspect the structure will likely be very similar (if not
> > identical), but a lot of the code I've written probably won't apply.  I have
> > a suspicion it would wind up being a parallel implementation, like much of
> > wxWidgets' cross-platform support.
> >
> > It may not be a bad idea to see if my implementation works with Apple's
> > Bonjour on Linux.  If it does, you could still do an Avahi implementation,
> > but this would make it much easier to ensure that software written against
> > wxDNSSD will work the same regardless of the backend.  (just an idea)
> >
> >
> > Anyway, I committed a change to servicediscoverytaskbase.h a few minutes
> > ago, so there should be a little more information there on what you need to
> > know to get going.  It's getting late, so I'm headed home for the evening.
> >
> >
> > We should probably continue this discussion on the wxCode mailing
> > list.   https://lists.sourceforge.net/lists/listinfo/wxcode-users  I
> > figured I would mention this before starting to CC the list (in case you
> > have privacy concerns about anything you've already mentioned).
> >
> >
> >   -------------------------------
> > Hank Schultz
> > Cedrus Corporation
> > http://www.cedrus.com /
> >
> >
> > On Dec 18, 2006, at 5:54 PM, Ishan Arora wrote:
> >
> > William,
> > Why is this project not accessible straight from wxCode? It would be
> > more visible to the interested that way. My purpose is to create an open
> > source network messenger. I am thinking of using Bonjour for the messenger
> > to know the presence of other instances of the messenger on the network. Is
> > there a better way you wish to recommend?
> >
> >
> > I just came across this on wikipedia.org
> >
> > Avahi <http://en.wikipedia.org/wiki/Avahi_%28software%29> is a Zeroconf
> > implementation for Linux <http://en.wikipedia.org/wiki/Linux> and BSDs<http://en.wikipedia.org/wiki/Berkeley_Software_Distribution>.
> > It implements IPv4LL, mDNS and DNS-SD. It is part of every major and many
> > minor Linux distributions, and is installed by default on e.g. Ubuntu<http://en.wikipedia.org/wiki/Ubuntu_%28Linux_distribution%29>version
> > 6.10. If run in conjunction with nss-mdns<http://0pointer.de/lennart/projects/nss-mdns/>it also offers host name resolution.
> >
> > Avahi also implements binary compatibility libraries that emulate
> > Bonjour and Howl, so software made to use those implementations can also
> > utilize Avahi through the emulation interfaces.
> >
> >
> > On 12/19/06, William H. Schultz < whs...@ce...> wrote:
> > >
> > > Thanks!  It was also just the thing I needed.  Of course, since no one
> > > had published a good implementation, I did the best I could and put it out
> > > there for everyone else.  The key things missing are documentation and
> > > support for text records.  I'm working right now on adding a short blurb to
> > > the servicediscoverytaskbase.h header file to give a quick overview of
> > > how stuff works.  I hope to have this committed within the next half hour.
> > >
> > >   Hank Schultz
> > >
> > > <cedrus_logo_w140.gif>
> > >
> > > http://www.cedrus.com/
> > >
> > >
> > >  On Dec 18, 2006, at 5:34 PM, Ishan Arora wrote:
> > >
> > > William,
> > > I guess I am the first one to be interested because the project is
> > > relatively new and alpha version :)
> > > Anyways I am finding Bonjour just the right thing for my project, so I
> > > owe you a big "Thank You!!!" for helping me use it in wxWidgets. I'll try to
> > > contribute to your side project ;)
> > > Thank you
> > >
> > >
> > > On 12/19/06, William H. Schultz < whs...@ce...> wrote:
> > > >
> > > > It has not been tested.  There is a mechanism implemented to work
> > > > based on the select() type of receiving events, which should theoretically
> > > > be compatible with Linux.  I tried to use this but had issues.  I don't
> > > > recall if I tried it on both OS X and Windows, but I think I may have.  This
> > > > would rely on idle events.  I also tried a threaded implementation, allowing
> > > > the bonjour calls to block.  I don't recall precisely why I'm not using this
> > > > method myself.
> > > > There are two methods implemented that could potentially work on
> > > > Linux.  Unfortunately, I know I had some kind of issues with both of these
> > > > methods on either Windows or Mac OS X, so you may have your work cut out for
> > > > you to get it running on Linux.  There is the slim possibility that it will
> > > > work pretty easily for you--that is, the methods are implemented--but I
> > > > wouldn't count on it.
> > > >
> > > > In the end, I had a hard time getting everything to work right on
> > > > Windows, so it could just be that I didn't devote enough effort into
> > > > tweaking things for the more globally available methods.
> > > >
> > > > Everything you need to make this work should be in
> > > > servicediscoverytaskbase.h and .cpp.  This is where the bonjour
> > > > tasks get set up.  Since they all work mostly the same way, all of the code
> > > > is in here.  One other place that may need modification is
> > > > wxServiceDiscoveryResult::SetNetworkInterface(), which takes an integer
> > > > index for the network interface and retrieves the name.  On Mac OS X, this
> > > > is en0, en1, fw0, etc...  If the Mac OS X code for this doesn't work under
> > > > Linux, it's just a matter of finding the line or two of code that takes this
> > > > index and turns it into a name.
> > > >
> > > > If you're willing to look over Apple's DNS SD documentation, then
> > > > the functionality of the code should be relatively clear.
> > > >
> > > > I have a vague recollection that the threaded implementation was a
> > > > lot more reliable than the idle-event-initiated-select() implementation
> > > > (though I think I had some issues with starting and stopping tasks).  You
> > > > are probably better off starting down this route.
> > > >
> > > >
> > > > I'm planning on rewriting the socket sample to use this, but it may
> > > > be a bit before I get around to it.
> > > >
> > > >
> > > > Oh, and in case you didn't already know, Bonjour doesn't do much of
> > > > anything for actual network communication.  You're on your own to set up a
> > > > server and or client.  Bonjour just tells you what claims to be available
> > > > (dns name and port...  you have to get the IP yourself, but that should be
> > > > implemented in my code in wxServiceDiscoveryResult::SetTarget).
> > > >
> > > > There are a lot of calls to wxLogDebug() to keep you informed as to
> > > > what is going on.
> > > >
> > > > You're the first person to contact me to say, "hey, I'm
> > > > interested!"  Sorry about the disarray.  Our potential use for this is way
> > > > out in the future, so it's a low priority side project, relative to tech
> > > > support and fixing bugs in shipping products.  ;)
> > > >
> > > >   Hank Schultz
> > > >
> > > > <cedrus_logo_w140.gif>
> > > >
> > > > http://www.cedrus.com/
> > > >
> > > >
> > > >  On Dec 18, 2006, at 4:50 PM, Ishan Arora wrote:
> > > >
> > > > William,
> > > > Thank you for your response. I am really thankful. Does wxDNSSD also
> > > > work on linux, even if not tested?
> > > >
> > > > On 12/19/06, William H. Schultz < whs...@ce...> wrote:
> > > > >
> > > > > Ishan,
> > > > > Yes, I have.  So far, it seems to be working pretty well for me
> > > > > internally.  I haven't yet inflicted it on anyone else in my company, and
> > > > > especially not any users yet.  You can get the source code here:
> > > > >
> > > > > https://svn.sourceforge.net/svnroot/wxcode/trunk/wxCode/components/servicediscovery/
> > > > >   (works in a web browser or subversion client)
> > > > >
> > > > > I don't have anything to help build it yet.  I'm currently
> > > > > including the source files as if they were part of my own project.  In
> > > > > include/wx/servicediscoverydef.h, this code is configured to only build in
> > > > > debug mode, so you will likely want to modify this file.
> > > > >
> > > > > There is one Bonjour feature that is missing, and that's the text
> > > > > records.  At the moment, I have no use for it, so I haven't implemented it.
> > > > > Everything else is working fine for me on Windows and Mac OS X.
> > > > >
> > > > > I'm sorry that I haven't yet put together a sample to show off how
> > > > > to use this functionality, but it's relatively simple.  There are four
> > > > > primary data types:  browser, resolver, service, and result.  If you have
> > > > > something to announce, you create a service and then start it.  If you want
> > > > > to find something, you create a service but *don't* start it.  You provide
> > > > > this service to the browser.  The browser returns results via events.  These
> > > > > results don't have full IP information, so you need to resolve your
> > > > > results.  The same result objects are used for both, and an object array has
> > > > > been defined in servicediscoveryresult.h to make it easier to keep
> > > > > up with the results.
> > > > >
> > > > > An important detail to remember is that all bonjour tasks must be
> > > > > started and stopped for anything to happen (browser, resolver, and service
> > > > > are all tasks).  If you don't start your service, it won't be visible (this
> > > > > is what you want if you are looking for results but not if you have a
> > > > > service to offer).  If you don't start the browser, you will never get any
> > > > > results.  The browser should stay active until you no longer need results.
> > > > > The resolver can probably be deactivated after you get your IP information.
> > > > >
> > > > > While bonjour supports IPv6, wxWidgets doesn't, so everything is
> > > > > done with IPv4.
> > > > >
> > > > >
> > > > > I hope this is enough to get you started!
> > > > >
> > > > >
> > > > >   Hank Schultz
> > > > >
> > > > > <cedrus_logo_w140.gif>
> > > > >
> > > > > http://www.cedrus.com/
> > > > >
> > > > >
> > > > > On Dec 18, 2006, at 3:37 PM, Ishan Arora wrote:
> > > > >
> > > > > hi
> > > > > you seem to have created a wrapper class for Apple's Bonjour. it
> > > > > seems to be very helpful from the description, but i am unable to access it.
> > > > > can you please check it. if it takes time to put them for download then
> > > > > please email me the files.
> > > > > thank you
> > > > >
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