Code.TechInterviews.com

Using the clipboard in WSH

checkthis — Fri, 25 Jul 2008 13:22:57 +0000

How to get the text from the clipboard

set objIE = CreateObject("InternetExplorer.Application")
objIE.Navigate("about:blank")
textFromClipboard = objIE.document.parentwindow.clipboardData.GetData("text")
objIE.Quit
WScript.Echo textFromClipboard

How to put the text into clipboard

textIntoClipboard = "Some text" & VbCrLf & "Some more text"

Set objIE = WScript.CreateObject("InternetExplorer.Application")
objIE.Navigate "about:blank"
Do Until objIE.ReadyState = 4
WScript.Sleep 100
Loop

objIE.document.ParentWindow.ClipboardData.SetData "text", textIntoClipboard
objIE.Quit

The detailed explanation could be found here.

Oracle: check the existance of logon/logoff triggers

checkthis — Fri, 25 Jul 2008 13:15:47 +0000

SELECT DECODE((COUNT(trigger_name)),0,'LOGON trigger missing', 'Number of logon triggers: ' || COUNT(trigger_name) ) "INFO"
FROM sys.dba_triggers
WHERE TRIGGERING_EVENT LIKE 'LOGON%' AND status='ENABLED' AND owner='SYS'
UNION
SELECT DECODE((COUNT(trigger_name)),0,'LOGOFF trigger missing','', 'Number of logoff triggers:' || COUNT(trigger_name)) "INFO"
FROM sys.dba_triggers
WHERE TRIGGERING_EVENT LIKE 'LOGOFF%' AND status='ENABLED' AND owner='SYS'

The field TRIGGERING_EVENT could have the spaces at the end! Very clever...

Unix shell: workaround for loop problem

checkthis — Fri, 11 Jul 2008 13:08:52 +0000

It's not possible to get the value of the loop variables in some versions of ksh.

Example:

#!/bin/ksh

num=0
cat $0 | while read line ; do
let num=num+1
done

echo "Number=$num"

This script will return "Number=0" as the result.

Here is the workaround for the problem: You should change the redirection method for the input file.

#!/bin/ksh

l=0
while read line ; do
let l=l+1
done < $0

echo "Number=$l"

The last script will return the correct result: "Number=9"

JavaScript: edit web page in browser

checkthis — Fri, 11 Jul 2008 13:00:43 +0000

Here is small bookmarklet, which allows to edit the web page for any site (ok, You could save the results on Your local machine only).

javascript:document.body.contentEditable='true'; document.designMode='on'; void 0

Oracle: redo log switches by date

checkthis — Thu, 08 May 2008 08:51:27 +0000

The following script help to find, how often the redo logs were switched.
It calculates the number by date and by hour.

SET LINESIZE 150
COLUMN DAY FORMAT A3
COLUMN Total FORMAT 99G990
COLUMN h00 FORMAT 999
COLUMN h01 FORMAT 999
COLUMN h02 FORMAT 999
COLUMN h03 FORMAT 999
COLUMN h04 FORMAT 999
COLUMN h05 FORMAT 999
COLUMN h06 FORMAT 999
COLUMN h07 FORMAT 999
COLUMN h08 FORMAT 999
COLUMN h09 FORMAT 999
COLUMN h10 FORMAT 999
COLUMN h11 FORMAT 999
COLUMN h12 FORMAT 999
COLUMN h13 FORMAT 999
COLUMN h14 FORMAT 999
COLUMN h15 FORMAT 999
COLUMN h16 FORMAT 999
COLUMN h17 FORMAT 999
COLUMN h18 FORMAT 999
COLUMN h19 FORMAT 999
COLUMN h20 FORMAT 999
COLUMN h21 FORMAT 999
COLUMN h22 FORMAT 999
COLUMN h23 FORMAT 999
COLUMN h24 FORMAT 999
BREAK ON REPORT
COMPUTE MAX OF "Total" ON REPORT
COMPUTE MAX OF "h00" ON REPORT
COMPUTE MAX OF "h01" ON REPORT
COMPUTE MAX OF "h02" ON REPORT
COMPUTE MAX OF "h03" ON REPORT
COMPUTE MAX OF "h04" ON REPORT
COMPUTE MAX OF "h05" ON REPORT
COMPUTE MAX OF "h06" ON REPORT
COMPUTE MAX OF "h07" ON REPORT
COMPUTE MAX OF "h08" ON REPORT
COMPUTE MAX OF "h09" ON REPORT
COMPUTE MAX OF "h10" ON REPORT
COMPUTE MAX OF "h11" ON REPORT
COMPUTE MAX OF "h12" ON REPORT
COMPUTE MAX OF "h13" ON REPORT
COMPUTE MAX OF "h14" ON REPORT
COMPUTE MAX OF "h15" ON REPORT
COMPUTE MAX OF "h16" ON REPORT
COMPUTE MAX OF "h17" ON REPORT
COMPUTE MAX OF "h18" ON REPORT
COMPUTE MAX OF "h19" ON REPORT
COMPUTE MAX OF "h20" ON REPORT
COMPUTE MAX OF "h21" ON REPORT
COMPUTE MAX OF "h22" ON REPORT
COMPUTE MAX OF "h23" ON REPORT

SELECT TRUNC(first_time) AS "Date",
TO_CHAR(first_time, 'Dy') AS "Day",
COUNT(1) AS "Total",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'00',1,0)) AS "h00",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'01',1,0)) AS "h01",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'02',1,0)) AS "h02",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'03',1,0)) AS "h03",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'04',1,0)) AS "h04",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'05',1,0)) AS "h05",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'06',1,0)) AS "h06",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'07',1,0)) AS "h07",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'08',1,0)) AS "h08",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'09',1,0)) AS "h09",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'10',1,0)) AS "h10",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'11',1,0)) AS "h11",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'12',1,0)) AS "h12",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'13',1,0)) AS "h13",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'14',1,0)) AS "h14",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'15',1,0)) AS "h15",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'16',1,0)) AS "h16",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'17',1,0)) AS "h17",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'18',1,0)) AS "h18",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'19',1,0)) AS "h19",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'20',1,0)) AS "h20",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'21',1,0)) AS "h21",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'22',1,0)) AS "h22",
SUM(DECODE(TO_CHAR(first_time, 'HH24'),'23',1,0)) AS "h23"
FROM V$log_history
GROUP BY TRUNC(first_time), TO_CHAR(first_time, 'Dy')
ORDER BY 1;
CLEAR BREAKS

JavaScript: Soundex implementation

checkthis — Thu, 10 Apr 2008 15:00:24 +0000

There is a special algorithm for comparision strings, which sound similar (Soundex).

Here is JavaScript Soundex implementation:

if (new_code != prev && new_code != "0" ) {
s_rez += new_code;
}

prev = new_code;
}

s_rez = s_rez + "0000"

return s_rez.substr(0,4);
}

Dynamic image resizing in PHP

admin — Sat, 05 Apr 2008 04:52:28 +0000

Via Darren Hoyt we found a reference to TimThumb, a quick and fast PHP script for on-the-fly image resizing. Once the script is on the server, and named timthumb.php, you can use the following reference to launch it:

Here's the source code for timthumb.php:

// TimThumb script created by Tim McDaniels and Darren Hoyt with tweaks by Ben Gillbanks
// http://code.google.com/p/timthumb/

// MIT License: http://www.opensource.org/licenses/mit-license.php

/* Parameters allowed: */

// w: width
// h: height
// zc: zoom crop (0 or 1)
// q: quality (default is 75 and max is 100)

// HTML example:

if( !isset( $_REQUEST[ "src" ] ) ) { die( "no image specified" ); }

// clean params before use
$src = preg_replace( "/^(\.+(\/|))+/", "", $_REQUEST['src'] );
$src = preg_replace( '/^(s?f|ht)tps?:\/\/[^\/]+/i', '', $src );
$new_width = preg_replace( "/[^0-9]/", "", $_REQUEST[ 'w' ] );
$new_height = preg_replace( "/[^0-9]/", "", $_REQUEST[ 'h' ] );
$zoom_crop = preg_replace( "/[^0-9]/", "", $_REQUEST[ 'zc' ] );

if( !isset( $_REQUEST['q'] ) ) { $quality = 80; } else { $quality = preg_replace("/[^0-9]/", "", $_REQUEST['q'] ); }

// set path to cache directory (default is ./cache)
// this can be changed to a different location
$cache_dir = './cache';

// get mime type of src
$mime_type = mime_type( $src );

// check to see if this image is in the cache already
check_cache( $cache_dir, $mime_type );

// make sure that the src is gif/jpg/png
if( !valid_src_mime_type( $mime_type ) ) {
$error = "Invalid src mime type: $mime_type";
die( $error );
}

// check to see if GD function exist
if(!function_exists('imagecreatetruecolor')) {
$error = "GD Library Error: imagecreatetruecolor does not exist";
die( $error );
}

// set document root
$doc_root = $_SERVER['DOCUMENT_ROOT'];

// get path to image on file system
$src = $doc_root . '/' . $src;

if(strlen($src) && file_exists( $src ) ) {

// open the existing image
$image = open_image($mime_type, $src);
if ($image === false) { die ('Unable to open image : ' . $src ); }

// Get original width and height
$width = imagesx($image);
$height = imagesy($image);

// generate new w/h if not provided
if($new_width && !$new_height) {
$new_height = $height * ($new_width/$width);
}
elseif($new_height && !$new_width) {
$new_width = $width * ($new_height/$height);
}
elseif(!$new_width && !$new_height) {
$new_width = $width;
$new_height = $height;
}

// create a new true color image
$canvas = imagecreatetruecolor($new_width, $new_height);

if( $zoom_crop ) {

$src_x = $src_y = 0;
$src_w = $width;
$src_h = $height;

$cmp_x = $width / $new_width;
$cmp_y = $height / $new_height;

// calculate x or y coordinate and width or height of source

if ( $cmp_x > $cmp_y ) {

$src_w = round( ( $width / $cmp_x * $cmp_y ) );
$src_x = round( ( $width - ( $width / $cmp_x * $cmp_y ) ) / 2 );

}
elseif ( $cmp_y > $cmp_x ) {

$src_h = round( ( $height / $cmp_y * $cmp_x ) );
$src_y = round( ( $height - ( $height / $cmp_y * $cmp_x ) ) / 2 );

}

imagecopyresampled( $canvas, $image, 0, 0, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h );

}
else {

// copy and resize part of an image with resampling
imagecopyresampled( $canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

}

// output image to browser based on mime type
show_image( $mime_type, $canvas, $quality, $cache_dir );

// remove image from memory
ImageDestroy( $canvas );

} else {

if( strlen( $src ) ) { echo $src . ' not found.'; } else { echo 'no source specified.'; }

}

function show_image ($mime_type, $image_resized, $quality, $cache_dir) {

// check to see if we can write to the cache directory
$is_writable = 0;
$cache_file_name = $cache_dir . '/' . get_cache_file();

if( touch( $cache_file_name ) ) {
// give 666 permissions so that the developer
// can overwrite web server user
chmod( $cache_file_name, 0666 );
$is_writable = 1;
}
else {
$cache_file_name = NULL;
header('Content-type: ' . $mime_type);
}

if(stristr( $mime_type, 'gif' ) ) {
imagegif( $image_resized, $cache_file_name );
}
elseif( stristr( $mime_type, 'jpeg' ) ) {
imagejpeg( $image_resized, $cache_file_name, $quality );
}
elseif( stristr( $mime_type, 'png' ) ) {
imagepng( $image_resized, $cache_file_name, ceil( $quality / 10 ) );
}
if( $is_writable ) { show_cache_file( $cache_dir, $mime_type ); }
exit;

}

function open_image ($mime_type, $src) {

if(stristr($mime_type, 'gif')) {
$image = imagecreatefromgif($src);
}
elseif(stristr($mime_type, 'jpeg')) {
$image = imagecreatefromjpeg($src);
}
elseif(stristr($mime_type, 'png')) {
$image = imagecreatefrompng($src);
}
return $image;

}

function mime_type ($file) {

$frags = split("\.", $file);
$ext = strtolower( $frags[ count( $frags ) - 1 ] );
$types = array(
      'jpg' => 'image/jpeg',
      'jpeg' => 'image/jpeg',
      'png' => 'image/png',
      'gif' => 'image/gif',
      'bmp' => 'image/bmp',
      'doc' => 'application/msword',
      'xls' => 'application/msword',
      'xml' => 'text/xml',
      'html' => 'text/html'
   );
$mime_type = $types[$ext];
if(!strlen($mime_type)) { $mime_type = 'unknown'; }
return($mime_type);

}

function valid_src_mime_type ( $mime_type ) {

if( preg_match( "/jpg|jpeg|gif|png/i", $mime_type ) ) { return 1; }
return 0;

}

function check_cache ( $cache_dir, $mime_type ) {

// make sure cache dir exists
if(!file_exists($cache_dir)) {
// give 777 permissions so that developer can overwrite
// files created by web server user
mkdir( $cache_dir );
chmod( $cache_dir, 0777 );
}
show_cache_file( $cache_dir, $mime_type );

}

function show_cache_file ( $cache_dir, $mime_type ) {

$cache_file = get_cache_file();

if( file_exists( $cache_dir . '/' . $cache_file ) ) {

// check for updates
$if_modified_since = preg_replace('/;.*$/', '', $_SERVER[ "HTTP_IF_MODIFIED_SINCE" ]);
$gmdate_mod = gmdate('D, d M Y H:i:s', filemtime( $cache_dir . '/' . $cache_file ) );
if(strstr($gmdate_mod, 'GMT')) {
$gmdate_mod .= " GMT";
}

//error_log("TimThumb: $gmdate_mod == $if_modified_since");

if ( $if_modified_since == $gmdate_mod ) {
header( "HTTP/1.1 304 Not Modified" );
exit;
}

// send headers then display image
header( "Content-Type: " . $mime_type );
header( "Last-Modified: " . gmdate('D, d M Y H:i:s', filemtime( $cache_dir . '/' . $cache_file ) . " GMT" ) );
header( "Content-Length: " . filesize( $cache_dir . '/' . $cache_file ) );
header( "Cache-Control: max-age=9999, must-revalidate" );
header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + 9999 ) . "GMT" );
readfile( $cache_dir . '/' . $cache_file );
exit;

}

}

function get_cache_file () {

$request_params = $_REQUEST;
$cachename = $_REQUEST['src'] . $_REQUEST['w'] . $_REQUEST['h'] . $_REQUEST['zc'] . $_REQUEST['q'];
$cache_file = md5( $cachename );
return $cache_file;

}

Oracle: usage of the tablespaces (permanent and temporary)

checkthis — Fri, 28 Mar 2008 17:01:44 +0000

SET pagesize 10000

SET COLSEP '|'
SET VERIFY off
SET serveroutput ON SIZE 1000000
BREAK ON report

COLUMN tablespace_name format a30 heading 'TABLESPACE'
COLUMN sizegb format 9999999999D9 heading 'SIZE-Gb'
COLUMN usedproc format 999D99 heading 'USED-%'
COLUMN status format a10 heading 'STATUS'
COMPUTE SUM LABEL 'Total size:' OF sizegb ON report

SELECT b.tablespace_name ,
b.bytes/1024/1024/1024 AS sizegb ,
NVL(100-((a.bytes/b.bytes)*100), 100) usedproc,
REPLACE(c.status,' ','_') status
FROM
( SELECT tablespace_name,
SUM(bytes) bytes
FROM dba_free_space
GROUP BY tablespace_name
) a ,
( SELECT tablespace_name,
SUM(bytes) bytes
FROM dba_data_files
GROUP BY tablespace_name
) b ,
dba_tablespaces c
WHERE b.tablespace_name = a.tablespace_name (+)
AND b.tablespace_name = c.tablespace_name
UNION
SELECT f.TABLESPACE_NAME,
f.TOTAL_MB/1024 sizegb,
NVL( (u.USED_MB/f.TOTAL_MB)*100, 0 ) usedproc,
'TEMPORARY' status
FROM
(
SELECT f1.TABLESPACE_NAME,SUM( f1.BYTES/1024/1024 ) TOTAL_MB
FROM (
SELECT TABLESPACE_NAME,BYTES
FROM dba_temp_files
UNION ALL
SELECT TABLESPACE_NAME,BYTES
FROM dba_data_files
WHERE TABLESPACE_NAME IN (
SELECT TABLESPACE_NAME
FROM dba_tablespaces
WHERE CONTENTS='TEMPORARY'
)
) f1
GROUP BY f1.TABLESPACE_NAME
) f,
(
SELECT u1.TABLESPACE,
SUM(u1.blocks) * MAX((SELECT VALUE FROM v$parameter WHERE name='db_block_size')/1024/1024) USED_MB
FROM v$sort_usage u1
GROUP BY u1.TABLESPACE
) u
WHERE f.TABLESPACE_NAME = u.TABLESPACE (+)
ORDER BY 1;

AppleScript: rotate mov file in QuickTime Pro

checkthis — Fri, 28 Mar 2008 11:07:09 +0000

Some kind of life hack: it's very easy to make mov file with digital camera, rotating it 90 degrees. However, it's not so easy to convert the result file to the 'visible' form.

QuickTime Pro could do this, and I found the AppleScript script, which could make it even more easy.

tell application "QuickTime Player"
set m to (get movie 1)
rotate m by -90
save self contained m in (choose file name with prompt "save self contained movie")
end tell

The script is mentioned here

Oracle: plan of the running query

checkthis — Fri, 28 Mar 2008 09:37:56 +0000

col object_name FOR a40

SELECT operation,
options,
object_name,
partition_id
FROM v$sql_plan
WHERE address IN
( SELECT sql_address FROM v$session WHERE sid = &sid.)
ORDER BY id;