python just for fun - Linux, Apache, MySQL, PHP Discussion Boards

Hello again everybody. I'm making a network game at the request of a friend of mine and I've run into some trouble. the thing is, in the game-cafe all the computers are networked and i need to send data from one PC to the other. I came onto the solution of using sockets for this, but now I'm in a bit of a complex situation. I need to create the classes for the host computer and the client computer. the client asks for a game while the host listens for connections and accepts them. the problem's are:-

1) When i read the python docs it said that the function socket.bind(address) binds the socket to an address. Is that address on the socket's host or on the client PC?

2) While the socket is listening for connections using the socket.listen(backlog) function, how will it know which connection is from the client PC, so that it can accept that connection?

3) The stupid problem....how exactly do I check the entire network for hosts that are currently listening for connections?

I would be REALLY thankful to anyone who can clear this up for me.

Hi, shahab96! It is a good question! Did you find out the solution?

not yet....it's kind of confusing.....

bind is for server to bind to a "well-known" port.
listen is the next function that gets executed by the server after binding to the port.

you should check out the Richard Stevens Network Programming books (vol 1) for a better explanation. although the information is explained using C, if you are a truly interested in learning; you will eventually learn it like a master. good luck,

David

I actually lost hope on that topic. Well in the months since i posted it i learned how to use sockets in c and java so i think if the python sockets are explained in C i will be able to easily follow on. Even better if the code is actually based on C sockets. (Preferably linux sockets) Thanks David Smile | :)

hello, i have been having a few issues with my cookies in php .....

First things first is this script below won't work at all... what am i doing wrong ?

if (isset($_COOKIE["user"]) && ($_COOKIE["pass"]))
{
 $user=$_COOKIE['user']; 
 $pass=$_COOKIE['pass'];
}else{$user=mysql_real_escape_string($_POST['username']); 
$pass=mysql_real_escape_string(hash('sha512', $_POST['password'])); 
$remember = (isset($_POST['remember']));
}

However, if i take out all the bits in bold, it works perfectly ....

The next thing is i tried a number of times to get my cookies to go back to the previous directory using things like "../" at the end but this doesn't seem to work ... what do i need to do to this script ..... Note: this file is 1 sub folder away from the root...

if($remember == 1)
{
$expire=time()+60*60*24*30;
setcookie ("user", "test", $expire);
setcookie ("pass", $pass, $expire);
}

Thanks for all your help, steve

I'll try and answer a small part: I think you are missing a second isset in the very first line.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

I have no idea where i should post this, so whatever.
here is a python program i made using vpython. I it must be downloaded before the program works. Also the program is made in python 3.1. It is a (very) innaccurate simulation of the milkyway.....mostly just created for the hell of it.

from visual import *

milkyway = frame()
sun_frame = frame(frame = milkyway)
mercury_frame= frame(frame = milkyway)
venus_frame= frame(frame = milkyway)
earth_frame= frame(frame = milkyway)
mars_frame= frame(frame = milkyway)
jupiter_frame= frame(frame = milkyway)
saturn_frame= frame(frame = milkyway)
uranus_frame= frame(frame = milkyway)
neptune_frame= frame(frame = milkyway)
pluto_frame= frame(frame = milkyway)

sun = sphere(frame = sun_frame, pos = (0, 0, 0), radius = 10, color = color.yellow, material = materials.emissive)
mercury = sphere(frame = mercury_frame, pos = (15, 0, 0), radius = 0.5, color = color.red, material = materials.rough)
venus = sphere(frame = venus_frame, pos = (25, 0, 0), radius = 1, color = color.orange, material = materials.emissive)
earth = sphere(frame = earth_frame, pos = (33, 0, 0), radius = 2, material = materials.earth)
mars = sphere(frame = mars_frame, pos = (39, 0, 0), color = color.red, material = materials.rough)
jupiter = sphere(frame = jupiter_frame, pos = (50, 0, 0), radius = 3, color = color.orange, material = materials.emissive)
saturn = sphere(frame = saturn_frame, pos = (60, 0, 0), radius = 2.5, color = color.magenta, material = materials.rough)
saturns_rings = ring(frame = saturn.frame, pos = saturn.pos, axis = (-1, 1, 0), radius = 4)
uranus = sphere(frame = uranus_frame, pos = (75, 0, 0), radius = 2.15, color = color.cyan, material = materials.emissive)
neptune = sphere(frame = neptune_frame, pos = (83, 0, 0), radius = 1.75, color = color.blue, material = materials.rough)
pluto = sphere(frame = pluto_frame, pos = (90, 0, 0), color = color.blue, material = materials.emissive)

view = input('Would you like a <S>ide-view or a <O>verhead view?\n')
if view == 'o' or view == 'O':
       milkyway.rotate(angle = pi/4)
else:
       pass

def revolve_venus(venus):
       venus.frame.rotate(angle = pi/6, axis = (0, 1, 0), origin = sun.pos)

def revolve_mercury(mercury):
       mercury.frame.rotate(angle = pi/5, axis = (0, 1, 0), origin = sun.pos)

def revolve_earth(earth):
       earth.frame.rotate(angle = pi/7, axis = (0, 1, 0), origin = sun.pos)

def revolve_mars(mars):
       mars.frame.rotate(angle = pi/8, axis = (0, 1, 0), origin = sun.pos)

def revolve_jupiter(jupiter):
       jupiter.frame.rotate(angle = pi/10, axis = (0, 1, 0), origin = sun.pos)

def revolve_saturn(saturn):
       saturn.frame.rotate(angle = pi/12, axis = (0, 1, 0), origin = sun.pos)

def revolve_pluto(pluto):
       pluto.frame.rotate(angle = pi/20, axis = (0, 1, 0), origin = sun.pos)

def revolve_neptune(neptune):
       neptune.frame.axis.rotate(angle = pi/16, axis = (0, 1, 0), origin = sun.pos)

def revolve_uranus(uranus):
       uranus.frame.rotate(angle = pi/14, axis = (0, 1 , 0), origin = sun.pos)

def revolve_neptune(neptune):
       neptune.frame.rotate(angle = pi/16, axis = (0, 1, 0), origin = sun.pos)

def revolve_all_planets(mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto):
       while True:
              revolve_mercury(mercury)
              revolve_venus(venus)
              revolve_earth(earth)
              revolve_mars(mars)
              revolve_jupiter(jupiter)
              revolve_saturn(saturn)
              revolve_uranus(uranus)
              revolve_neptune(neptune)
              revolve_pluto(pluto)
              rate(10)

revolve_all_planets(mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto)

people should start to use vpython. it is much better then pyopengl! Cool | :cool:

there is a flaw in your design.

pluto isn't a planet Smile | :)

That's ok, cause the Milky Way isn't a solar system Smile | :)

Maybe I should start pushing (m) as the smart-ass emote Wink | ;-)

wth? when did that happen? Confused | :confused:

Like 4 years ago, in 2006 Internation Astronimocal Union changed or rather, refined the definition of planet and pluto was too small to be fitting into that. So they reclassified it as dwarf planet.

There is also a flaw in your description: this is a simulation of the solar system, not the Milky Way. The latter would require a few stars in addition to the sun.

Contains coding, but not narcotic.

....ok....i guess this does make sense (except for pluto not being a planet.) I'll have to be a bit more careful next time. Wink | ;)

on pluto

http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html[^]

Chris J
www.redash.org

oh...i never knew that. thanks for the update cjoki Big Grin | :-D

Better remove question icon from your post and add some text in title specifying that this is not a question, since this forum is generally used to ask and answer programming questions.

Hi am back again after weeks of trying to populate multiple combo box from a mysql database.
I have a script that loads one combo box / drop down list well by populating car make.
The lists are supposed to be first "car make" then second "car model" third "car badge" fourth is "car description"
the code at present is

PHP

<?php
	
	
	include("../includes/store.php");
	
	//echo mysql command
	$query = "SELECT make FROM cars";
		$result  = mysql_query($query) or die(mysql_error()); //excute or return if there is an error
		
		echo "Make";
		$dropdown = "<select name='make'>";
			while ($row = mysql_fetch_assoc($result))
			{
				$dropdown .=  "\r\n<option value='{$row['make']}'>{$row['make']}</option>";
			}
			$dropdown .= "\r\n</select>";
			echo $dropdown;
			echo "<br>" . "<br>";
			
	$query1 = "SELECT model FROM carmodel WHERE makeid = {$row['id']}";
	$carmodel = mysql_query($query1) or die(mysql_error()); //execute query and load fields to page
	
		echo "Model";
		$list2 = "<select name='model'>";
			while ($row = mysql_fetch_assoc($carmodel))
			{
				$list2 .= "\r\n<option value='{$row['model']}'>{$row['model']}</option>";
			}
			$list2 .= "\r\n</select>";
			echo $list2;

?>

The database table are
table 1 cars = "carid" & "make"
table 2 carmodel = "modelid" & "makeid" & "model"
table 3 badge = "badgeid" & "modelid" & "badge"
table 4 cardesc = "descid" & "badgeid" & "yearofman" & "transmission" & "drivetype" & "fueltype"

I can populate the first dropdown list but how to get the second drop down to populate with the car model records based on the selected car make
then the cars badge of the filtered car model the description is proving to be a pickle. Please help as after days of searching and playing with code
cant seem to nail it right.
Thanks in advance.

I'm affraid your page logic is off slightly. Your sublist (model) should be dependant on your primary list (cars). Which would mean that on a selection change on the client's end you either need to load the sub list from the server using Ajax or you need to prepare multiple sub selects and display the one belonging to the cars that is selected.

If you opt for the first alternative you will need to create a seperate php file that will provide you the options for the 'model' select. You should then call this page on the 'onchange' event of the 'make' select using Ajax and fill the 'make' select.

If you opt for the second alternative you will have to generate an option list for each of the various 'make' possibilities and store them in either invisible select elements or in JavaScript array's. Eg:

$query1 = "SELECT model FROM carmodel ORDER BY makeid";
$carmodel = mysql_query($query1) or die(mysql_error());
$last_make = -1;
$list2 = "<select name='model'>";
while ($row = mysql_fetch_assoc($carmodel))
{
   if ( $last_make != $row['makeid'] ) {
     if ($list2 != '') $list .= "</select>";
     $list2 .= "<select name='model_{$row['makeid']}' style='display: none;'>";
     $last_make = $row['makeid'];
   }
   $list2 .= "\r\n<option value='{$row['model']}'>{$row['model']}</option>";
}
$list2 .= "\r\n</select>";
echo $list2;

Please note I've not tested the code so it might contain some mistakes, but the overall logic should be clear.

Hi Dears

I need use an array that accessible from each users session

in fact this array must resident in memory

pleas help me...

This sounds like it would be better handled via a table. Is there a specific need for an array?

a Table?

Do you mean there is a table in the database?

For some reason I can not I use the database

in fact a robot call and send information to a url Several hundred times a second At different times

i need this information but the MySql Speed is lower than robot calling and Mysql Pass throw an thread Error

The best solution is to store data in memory And then we save data with 'BatchInsert' in MySql

But!! do not know how i can stored the information in memory

this technology in ASP.net is Application Variables

Pleas Help Me !!!

modified on Thursday, January 6, 2011 9:15 AM

I would look into memory tables http://dev.mysql.com/doc/refman/5.0/en/memory-storage-engine.html[^] as an alternative as it will give you speed and sql access. That is if you can use a mysql database since it sounds like you have some issue with any db access or was it just the speed issue?

As an alternative you can use two arrays in a double buffer kind of configuration. You will need to write some code to flip between them so as one array fills up a certain amount of data, say 10000 records, you switch to the second array for input and you can write the first arrays data to a database and then clear it out. Then when then the second array is filled switch input to the first and insert the second arays data to a database. Just keep repeating this switching, dumping and inserting while the script runs.

One issue that jumps to mind is going to be script execution time. How long is this script meant to run?

Another would be with hanging the PHP engine with a single thread of execution. In this issue you may be able to read up on making a multi-threaded php script. here is one article on it that I found with a quick google search... http://phpmultithreaddaemon.blogspot.com/[^]

Hope that helps

Hi,

I am sending a HTTP post request to external url and if it is successfull - the client server returns OK:12345 on web page.

Now 12345 is an id and this is what i need to capture and store it as a variable to be used in my second script. Is there any way i can save this id as a variable or something.

Thank You.

Sounds like cross site scripting which is a security issue and you will find hard to work around. You can use something like cURL to do it though.