LFS Forum - Read mpr data in php

#1 - ESPAÑA[XTM]

Read mpr data in php

Sat, 18 Aug 2007 19:30

Hi

I´m going to try do a php script which can read all the data from mpr.

WeatherWind, LapsPlayerFast Lap, End places, etc..

And I would get a bit help for this..

**Note, I know that would be more easy in C but must be in php..**

Thx

#2 - DarkTimes

Sat, 18 Aug 2007 20:03

Well you just need to open the file and read out the bytes, it's farily simple in both C and PHP. The way the data is stored is actually pleasingly straight-forward, you can see what each byte means on the LFS site: http://www.lfs.net/?page=MPR.

#3 - ESPAÑA[XTM]

Sat, 18 Aug 2007 20:06

Already I can open the replay file, with fopen, with I don´t know how do it by bites :S

#4 - DarkTimes

Sat, 18 Aug 2007 20:15

OK - It's been a long time since I did any PHP, and I never really worked with binary data much, but if I remember rightly you just need to read the data out as strings and then use the unpack() function to convert the bytes from their binary representation into all the nice numbers and stuff that you need. If you look round the forum, or search on google, you'll find a few example of how to work it.

#5 - ESPAÑA[XTM]

Sat, 18 Aug 2007 20:29

Aja, ok thx, I will try and I´ll post again here with the results.

Thx u again

#6 - ESPAÑA[XTM]

Sun, 19 Aug 2007 14:14

I´ve tried unpack() but It don´t work, but very posible because me.. Could someone do a little example using unpack for read the mpr?

#7 - Dygear

Mon, 20 Aug 2007 00:37

A good example could be found in my signature, It contains code that uses the unpack function to read data from LFSWorld.



<?php 
    function get_hosts() {
        $string = $this->make_query("&action=hosts");
        for ($pointer = 0, $i = 0; $pointer <= strlen($string); $i++) {
            $NumberOfRacers = @unpack("c", substr($string, $pointer + 52, 1));
            $NumberOfRacers = $NumberOfRacers[1];
            $NumberOfRacersLen = $NumberOfRacers * 24;
            $PointerPast = $NumberOfRacersLen + 53;
            $result[$i] = array();
            if (($result[$i] = @unpack("a32hostname/c4tmlt/a4tcrm/icars/irules/claps/cqual/cspare1/cspare2/cnrofracers/a{$NumberOfRacersLen}racernames", substr($string, $pointer, $PointerPast)))) {
                $result[$i]['racernames'] = preg_split("/\\0/", $result[$i]['racernames'], -1, PREG_SPLIT_NO_EMPTY);
                $result[$i]['tmlt'] = unpack("ctype/cmain/cletter/ctestId", $result[$i]['tmlt']);
                $result[$i]['tcrm'] = unpack("ctrack/cconfig/creversed/cmax", $result[$i]['tcrm']);
            } else {
                unset($result[$i]);
            }
            $pointer += $PointerPast;
        }
        return $result;
    }
?>