Ciao-users August 2002

ciao-users@cliplab.org

4 participants
3 discussions

Operators
by Bartek Wilczynski 13 Aug '02

13 Aug '02

Hello ! Probably that's a newbie question, but I'm really lost. I want to declare an operator (like :-op(500,xfx,-:-).) in a module in a way that I could use it from the application that uses this module. -- Bartek Wilczynski ============================================================================== Message: Address: Action: help majordomo(a)clip.dia.fi.upm.es Info. on useful commands subscribe ciao-users-request(a)clip.dia.fi.upm.es Subscribe to this list unsubscribe ciao-users-request(a)clip.dia.fi.upm.es Unsubscribe from this list <whatever> ciao-users(a)clip.dia.fi.upm.es Send message to list ----------------------------------------------------------------------------- Archived messages: http://www.clip.dia.fi.upm.es/Mail/ciao-users/ -----------------------------------------------------------------------------

2 1

fetch_url fails with an existing page...
by Sebastian Sardina 12 Aug '02

12 Aug '02

Hello, I have a very simple question. I'm trying to download the content of a web page using the pillow library with ECLIPSE Prolog. The web page exists for sure, as I can access it via any browser, including lynx. I can even download it using "lynx --source" However, when I fetch it with fetch_url/3 I get a "Not found" reply! [eclipse3]:url_info('http://www.espectador.com/dolina/principal.htm',UI), fetch_url(UI,[],R), member(status(X,C,RC),R), string_list(L,RC). UI = http('www.espectador.com', 80, [47, 100, 111, 108, 105, 110, 97, 47, 112, 114, 105, 110, 99, 105, 112, 97, 108, 46, ...]) X = request_error C = 404 R = [status(request_error, 404, [78, 111, 116, 32, 70, 111, 117, 110, 100]), message_date(date('Thursday', 1, 'August', 2002, '01:04:06')), http_server([65, 112, 97, 99, 104, 101, 47, 49, 46, 51, 46, 50, 50, 32, 40, ...]), connection([99, 108, 111, 115, 101]), content_type(text, html, [charset = 'iso-8859-1']), content([60, 33, 68, 79, 67, 84, 89, 80, 69, 32, 72, 84, ...])] RC = [78, 111, 116, 32, 70, 111, 117, 110, 100] L = `Not Found` As you can see it returns with error 404, not found. The web page, you can check, does exist: http://www.espectador.com/dolina/principal.htm Notice it's not a problem of redirection, as the answer is an error. I have had similar problems with ECLIPSE's http_client library so I guess there is some relation with this problem. So far, this was the only web page I had problem, but I really want to know if fetch_url/3 should work with ANY possible web page a browser can read (modulo automatic redirection of course) does anyone has a clue on this problem? Thanks a lot! Sebastian ============================================================================== Message: Address: Action: help majordomo(a)clip.dia.fi.upm.es Info. on useful commands subscribe ciao-users-request(a)clip.dia.fi.upm.es Subscribe to this list unsubscribe ciao-users-request(a)clip.dia.fi.upm.es Unsubscribe from this list <whatever> ciao-users(a)clip.dia.fi.upm.es Send message to list ----------------------------------------------------------------------------- Archived messages: http://www.clip.dia.fi.upm.es/Mail/ciao-users/ -----------------------------------------------------------------------------

1 0

The sockets module and socket names
by Julian Fondren 12 Aug '02

12 Aug '02

I just got ciao yesterday, and for my first program in it I wrote a little hello-server (accept connections, greet them, close them.) Part of the hello-server is an announce-connection/1 that takes the Socket stream and writes something like "Recieved a connection from 1.0.1.0:12345" ... which is a little difficult to write in Ciao, because it doesn't have any kind of getsockname. Servers in ciao have no way to know who they're getting connections from! I'd suggest ip_socket_name/3 (+Socket, -Host, -Port) (actually I'd suggest 'ip-socket-name', but the above is more consistent.) where Host is an atom such as as '1.0.1.0' and Port is an atom such as 12345. The "ip-" in "ip-socket-name" is there because the hostname/port part of a socket address structure is defined at the IP level ("tcp-" would be inappropriate, since UDP sockets have the same address structure). _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com ============================================================================== Message: Address: Action: help majordomo(a)clip.dia.fi.upm.es Info. on useful commands subscribe ciao-users-request(a)clip.dia.fi.upm.es Subscribe to this list unsubscribe ciao-users-request(a)clip.dia.fi.upm.es Unsubscribe from this list <whatever> ciao-users(a)clip.dia.fi.upm.es Send message to list ----------------------------------------------------------------------------- Archived messages: http://www.clip.dia.fi.upm.es/Mail/ciao-users/ -----------------------------------------------------------------------------

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Ciao-users August 2002