Ubuntu Get Window Position Information; xwininfo

August 18, 2009

To get the position of a window in Ubuntu, in terminal:

Code

 
xwininfo

Code

 
xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.
 
xwininfo: Window id: 0x20ffa54 "Dark Launch - Mozilla Firefox"
 
  Absolute upper-left X:  1039
  Absolute upper-left Y:  48
  Relative upper-left X:  1039
  Relative upper-left Y:  48
  Width: 800
  Height: 600
  Depth: 24
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +1039+48  -865+48  -865-402  +1039-402
  -geometry 800x600+1039+48

MySQL Calculate Hours From Two Timestamps

August 17, 2009

To calculate the difference between two timestamps in seconds or hours use the following:

SQL

 
SELECT(
    UNIX_TIMESTAMP("2009-08-17 10:00")-UNIX_TIMESTAMP("2009-08-17 09:00")
) AS seconds
 
>>> 3600

SQL

 
SELECT(
    (UNIX_TIMESTAMP("2009-08-17 10:00")-UNIX_TIMESTAMP("2009-08-17 09:00"))/3600
) AS hours
 
>>> 1.0000

Ubuntu Nautilus Back and Forth Mouse Click Buttons

August 16, 2009

Navigate back and forward in Nautilus using the mouse back/forward buttons:
Run in terminal:

Code

 
sudo apt-get install xvkbd xbindkeys x11-utils

Find the mouse keys:

Code

 
xev | grep ', button'

Click in the window to see the mouse codes. Example:

Code

 
    state 0x10, button 8, same_screen YES
    state 0x10, button 8, same_screen YES
    state 0x10, button 9, same_screen YES
    state 0x10, button 9, same_screen YES

8 for left thumb click, 9 for right thumb click.
Edit the key bindings. Terminal:

Code

 
gedit ~/.xbindkeysrc

Code

 
"/usr/bin/xvkbd -xsendevent -text "\[Alt_L]\[Left]""
  m:0x0 + b:8
"/usr/bin/xvkbd -xsendevent -text "\[Alt_L]\[Right]""
  m:0x0 + b:9

Run xbindkeys in terminal:

Code

 
xbindkeys

Now clicking the back and forth mouse keys will navigate back and forth in Nautilus.

Base58 Encode and Decode using PHP with example; base58_encode(), base58_decode()

August 7, 2009

Base58 is base62 with some confusing characters removed. These removed are 0, O, l, I.

PHP

 
function base58_encode($num) {
    $alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
    $base_count = strlen($alphabet);
    $encoded = '';
 
    while ($num >= $base_count) {
        $div = $num / $base_count;
        $mod = ($num - ($base_count * intval($div)));
        $encoded = $alphabet[$mod] . $encoded;
        $num = intval($div);
    }
 
    if ($num) {
        $encoded = $alphabet[$num] . $encoded;
    }
 
    return $encoded;
}
 
function base58_decode($num) {
    $alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
    $len = strlen($num);
    $decoded = 0;
    $multi = 1;
 
    for ($i = $len - 1; $i >= 0; $i--) {
        $decoded += $multi * strpos($alphabet, $num[$i]);
        $multi = $multi * strlen($alphabet);
    }
 
    return $decoded;
}

PHP

 
<?php
header('Content-Type: text/plain');
 
$array = 
    array(
        // base10 => base58
        '3429289555' => '6e31iZ',
        '3368' => '215',
        '74' => '2h',
        '75' => '2i',
        '94' => '2C',
        '88' => '2w',
        '195102' => 'ZZQ',
        '1253576' => '7qDo',
        '177' => '44',
        '193' => '4k',
        '195' => '4n'
    );
 
foreach ($array as $base10 => $base58) {
    echo 'base58_encode(\'', $base10, '\') => ', base58_encode($base10), "\n";
}
 
echo "\n";
foreach ($array as $base10 => $base58) {
    echo 'base58_decode(\'', $base58, '\') => ', base58_decode($base58), "\n";
}

Code

 
base58_encode('3429289555') => 6e31iZ
base58_encode('3368') => 215
base58_encode('74') => 2h
base58_encode('75') => 2i
base58_encode('94') => 2C
base58_encode('88') => 2w
base58_encode('195102') => ZZQ
base58_encode('1253576') => 7qDo
base58_encode('177') => 44
base58_encode('193') => 4k
base58_encode('195') => 4n
 
base58_decode('6e31iZ') => 3429289555
base58_decode('215') => 3368
base58_decode('2h') => 74
base58_decode('2i') => 75
base58_decode('2C') => 94
base58_decode('2w') => 88
base58_decode('ZZQ') => 195102
base58_decode('7qDo') => 1253576
base58_decode('44') => 177
base58_decode('4k') => 193
base58_decode('4n') => 195

NOTE:

Code

 
Base62: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
Base58:  123456789abcdefghijk mnopqrstuvwxyzABCDEFGH JKLMN PQRSTUVWXYZ