cannot start listen command
charles reid
charlesreid1 at gmail.com
Fri Sep 5 12:18:32 CDT 2008
Well, I have two ideas, one is probably more likely to work (and more
attractive) than the other.
PHP has a function to send data to a socket that's connected, called
socket_send (http://nl3.php.net/manual/en/function.socket-send.php). I
think you would have to use socket_accept to connect with the open Octave
socket (or you could use socket_sendto, which is a brute-force method that
sends data to a socket whether it's connected or not), and then socket_send
could be used to make PHP communicate with Octave.
There's also a socket_listen (
http://nl3.php.net/manual/en/function.socket-listen.php), so first you
create your socket, then you bind it to a name, then you start listening on
it. This would probably be the way to go with Octave returning results to
PHP.
The PHP documentation has got some great examples and it's well-written, so
that should definitely help you out a lot.
The second idea...
> Also I would like to
> have the Ocatve code running all the time, or at least have access
> to large amount of data in the internal memory without having to
> make a slow load from the harddrive between the calls. Also there
> may be several user access this information at the same time.
I'm not sure exactly what you mean by this, and this suggestion may not
satisfy your needs, but you could try using files as an intermediary (i.e.
PHP writes input to file, calls octave using a program execution function
(more info here http://nl3.php.net/manual/en/ref.exec.php), octave writes
the output to another file, and php reads & displays it to the user). This
would definitely be slower, but if you need to get something working quick,
but you need more time to figure out the socket-to-socket stuff, this may be
a good intermediate solution.
This has captured my interest, I will be playing around with this more to
see if I can get it working. Please let us know how this goes for you.
Charles
On Thu, Sep 4, 2008 at 10:00 PM, Sverker Sikström <
sverker.sikstrom at lucs.lu.se> wrote:
> Hi Charles
>
> Thanks a lot! The demo worked fine and it is easy to see how the calls must
> be made and what needs to be initalized. If you happen to know how to send
> thing from PhP then lets us know. Otherwise thanks a lot for the help!
>
> Sverker
>
>
> charles reid skrev:
>
>> The original author of the sockets package put together a test program,
>> which can be found here (
>> http://article.gmane.org/gmane.comp.gnu.octave.sources/60) and is
>> included below. Also, you might try 'man listen' from a Unix command line,
>> since it's the Unix listen that the sockets package is calling.
>> ## Tests for octave sockets
>> ##
>>
>> function test_octave_socket()
>> page_screen_output = 0
>> load_socket_constants
>>
>> fail = 0
>>
>> # Create the sockets
>> ## Server socket
>> server = socket(AF_INET, SOCK_STREAM, 0)
>>
>> if( server < 0 )
>> ++fail
>> return
>> end
>>
>> rc = bind(server,9001)
>> if( rc ~= 0 )
>> ++fail
>> return
>> end
>>
>> rc = listen(server,1)
>> if( rc ~= 0 )
>> ++fail
>> return
>>
>> end
>>
>> ## Client socket
>> client = socket(AF_INET, SOCK_STREAM, 0)
>> if( client < 0 )
>> ++fail
>> return
>> end
>>
>> # Create the connection and accept the connection
>> server_info = struct("addr","127.0.0.1 <http://127.0.0.1>", "port",9001)
>>
>>
>> rc = connect(client, server_info)
>> if( rc ~= 0 )
>> ++fail
>> return
>> end
>>
>> server_data = accept(server)
>> if( server_data < 0 )
>> ++fail
>> return
>> end
>>
>> # Send and receive data
>>
>> ## Send as string from client
>> msg = "Hello socket-land!"
>> rc = send( client, msg )
>> if( rc ~= length(msg) )
>> ++fail
>> return
>> end
>>
>> ## Receive at server
>> [msg_s, len_s] = recv( server_data, 100 )
>>
>> if( msg_s == -1 || len_s ~= length(msg) )
>> ++fail
>> return
>> end
>>
>> ## Send back out from server
>> rc = send( server_data, msg_s )
>> if( rc ~= length(msg_s) )
>> ++fail
>> return
>> end
>>
>>
>> ## Receive at client
>> [msg_c, len_c] = recv( client, 100 )
>> if( msg_c == -1 || len_c ~= length(msg) )
>> ++fail
>> return
>> end
>>
>> ## Compare original string with recv string
>> msg_in = num2str( msg_c, '%c' )
>>
>> if( msg_in ~= msg )
>> ++fail
>> return
>> end
>>
>> rc = disconnect( client )
>> rc = disconnect( server_data )
>> rc = disconnect( server )
>>
>> printf( 'Number of failures: %d\n', fail )
>>
>>
>> end
>>
>> Hope this helps.
>>
>>
>> Charles
>>
>> On Thu, Sep 4, 2008 at 10:56 AM, charles reid <charlesreid1 at gmail.com<mailto:
>> charlesreid1 at gmail.com>> wrote:
>>
>> Hi Sverker -
>>
>> Don't you want listen('127.0.0.1 <http://127.0.0.1>','fork')?
>>
>>
>> Charles
>>
>>
>> On Thu, Sep 4, 2008 at 7:24 AM, Ben Abbott <bpabbott at mac.com
>> <mailto:bpabbott at mac.com>> wrote:
>>
>>
>>
>> On Sep 4, 2008, at 8:29 AM, Sverker Sikström
>> <sverker.sikstrom at lucs.lu.s
>> e> wrote:
>>
>> > Dear Ben
>> >
>> > Thanks a lot for you very helpfull instruction of how to get
>> going
>> > with the Listen command a few weeks back. I did get command
>> > "started" using your help, however, I have not been able get it
>> > going yet. I would very much appreciate a helping hand here.
>> >
>> > My goal is to have Php programm communciating with Octave,
>> so that
>> > one can that when a visotor click on a webpage than this
>> webpage can
>> > send string to Octave that makes a calcualtion and send its
>> back to
>> > the webpage (where we use Php) at the webpage. Also I would
>> like to
>> > have the Ocatve code running all the time, or at least have
>> access
>> > to large amount of data in the internal memory without having to
>> > make a slow load from the harddrive between the calls. Also
>> there
>> > may be several user access this information at the same time.
>> >
>> > I am not sure how to do this. But I think the Listen command
>> would
>> > be the way to go. Is that correct?
>> >
>> > I try to run listen with:
>> >
>> > octave-3.0.1:1> pkg load sockets
>> > listen('128.0.0.1 <http://128.0.0.1>','fork')
>>
>> > error: connect: expecting a octave_socket or integer
>> > octave-3.0.1:2>
>> >
>> > But I get an error message (see above). I guess I have the wrong
>> > call, or perhapse I need to initaitve something before.
>> >
>> > Once this code in the Octave is up and running. Then how do
>> you call
>> > this rotine from Php?
>> >
>> > I would appreciate help on this topic very much. If you do
>> not know
>> > how to set this up, please suggest someone that could help
>> us out on
>> > this.
>> >
>> > Sincerely, Sverker Sikström
>> >
>> > Ben Abbott skrev:
>> >>
>> >> On Aug 11, 2008, at 5:05 AM, Sverker Sikström wrote:
>> >>
>> >>> Hi
>> >>>
>> >>> This is probabaly a very simple questions, but I am stuck
>> and new to
>> >>> Octave. I am trying to run the command 'listen'
>> >>> (http://octave.sourceforge.net/doc/f/listen.html) on
>> Octave. But
>> >>> it does
>> >>> not seem to find the command:
>> >>>
>> >>> octave-3.0.1:46> listen
>> >>> error: `listen' undefined near line 46 column 1
>> >>> octave-3.0.1:46>
>> >>>
>> >>> Have I not installed Octave correctly? I am using mac 0s
>> 10.5. 4.
>> >>> Any
>> >>> help is appreciated!
>> >>>
>> >>> Sverker
>> >>
>> >> I haven't tried to do this under Mac OS X, but you'll need to
>> >> install the sockets package from Octave-Forge. The "listen"
>> command
>> >> is part of that package (it is not part of Octave's core
>> functions).
>> >>
>> >> http://octave.sourceforge.net/sockets/index.html
>> >>
>> >> To install see "help pkg"
>> >>
>> >> Ben
>>
>> Unfortunately, I'm not knowledgeable in what you'd like to do
>> ..., so
>> I've cc'd Octave's help list. Hopefully someone will be able
>> to answer
>> your questions.
>>
>> Ben
>> _______________________________________________
>> Help-octave mailing list
>> Help-octave at octave.org <mailto:Help-octave at octave.org>
>> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
>>
>>
>>
>>
>
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