MY NODE

Before you buy Cloud Mining

noreply@blogger.com (my node) — Wed, 30 Apr 2014 08:35:00 +0000

Why would a company sell already bought hashing power to someone else without making 100% bitcoin profit mining it alone. It doesn't make sense at all unless the seller is trying to sell it for a highly over priced amount or scam you.

Some companies say that you can trade the bought GHS but even then bitcoin difficulty rises and GHS drops in value very fast. Unless you are a good short term trader GHS trading is a ripoff. This apply to mining as well with increasing difficulty you will get lesser returns for your GHS plus increased maintenance fee.

Just my thoughts, Please do proper research before you invest in cloud mining.

Mahara web services - simple guide

noreply@blogger.com (my node) — Mon, 03 Mar 2014 19:39:00 +0000

Mahara web services can be installed as a plugin. Installation is a easy process. you can find the steps in here https://wiki.mahara.org/index.php/Plugins/Auth/WebServices#Installation_Instructions

extract the zip file and put to folders inside mahara /path/to/mahara/webservice and /path/to/mahara/auth/webservice

login to mahara as admin goto menu extensions -> Plugin administration under Plugin type: auth heading install webservice

code check for https so if you do not have SSL in your site and you want to test the web services you can comment out https check part in the code (NOT recommended for a production server)

for example if you want to use REST go to the folder webservice -> rest inside server.php comment

// you must use HTTPS as token based auth is a hazzard without it
/*if (!is_https()) {
    header("HTTP/1.0 403 Forbidden - HTTPS must be used");
    die;
}*/

Now you can test web services using the built in Web service test client
click Configuration link near webservice plugin. Enable WebServices master switch. under Manage Service Access Tokens add a user and generate a token. Now click Web service test client tab and select
protocol - REST
Authentication Type - Token
Service - choose the service you selected when generating token.
Select a function and enter token.

You can also use curl from another site to access the webservice like this

<?php
$service_url = 'http://yoursite.com/mahara/webservice/rest/server.php';
$token = 'your token';

$curl = curl_init($service_url);

$curl_post_data = array(       

 'wsfunction' => 'mahara_user_get_users', // the function to be called
      'wstoken' => $token //token need to be passed in the url
);

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $curl_post_data);
$curl_response = curl_exec($curl);

$info = curl_getinfo($curl);

if ($curl_response === false) {
    $info = curl_getinfo($curl);
    curl_close($curl);
    die('error occured during curl exec. Additioanl info: '.var_export($info));
}
curl_close($curl);

header("Content-type: text/xml");

echo $curl_response;

?>

Mahara - Sorry, your registration attempt was unsuccessful. This is our fault, not yours. Please try again later.

noreply@blogger.com (my node) — Sat, 01 Mar 2014 19:12:00 +0000

Fix is to setup email setting in site options. I installed Mahara on a shared hosting. I'm not sure how to setup email setting required for localhost other than giving working SMTP details. Administration -> Site options -> Email settings

div losing background color/image when resizing the browser window

noreply@blogger.com (my node) — Thu, 13 Feb 2014 07:28:00 +0000

When you have div width 100% it apply to browser viewpoint only not the max page width. This can be a problem when you have another div with a fixed width length. The fix is to put a min-width with max possible page width.

<html>
<head>
<style>
html, body{margin:0; padding:0;border: 0;outline: 0;}
</style>
</head>
<body>

<!--The problem-->
<div style="margin:0; width:100%; background-color:#060;">
 Header 1
</div>

<div style="margin:0 auto; width:1000px; background-color:#03C;">     
 Text Line 1
</div>

<br /><br />

<!--Fix-->
<div style="margin:0; width:100%; min-width:1000px; background-color:#060;">
 Header 2
</div>

<div style="margin:0 auto; width:1000px; background-color:#03C;">     
 Text Line 2
</div>

</body>
</html>

Don't forget padding widths when calculating min width.

Cannot login to Games for Windows LIVE

noreply@blogger.com (my node) — Wed, 12 Feb 2014 04:02:00 +0000

Login issue for me was caused by two-step verification. you can either disable it temporally till you finish game or you can use a App password that you can find in your Live account under "Security info".

GFWL can be very annoying at times. I had problems with it every time it was required to play a specific game. Wish they at least give a detailed error message without wasting my time for hours looking for fixes.

HD 7750 cypto coin mining experience

noreply@blogger.com (my node) — Thu, 06 Feb 2014 14:12:00 +0000

HD 7750 is a entry level card for mining any kind of coin. suitable for casual mining while you do other stuff in the pc. I mine Feathercoin (FTC) as it has a very low difficulty but I think Litecoin will give the same return when converted to Bitcoins. I get around 2.5FTC per day with wemineftc.com pool.

My HD 7750 punch 134 khash/s on Intensity level of 13 in GUIminer-scrypt
GPU clock increased to 825MHz (core speed 800)
Memory clock speed decreased to 700Mhz to reduce temperature. you can change card settings using amd catalyst control center.

It can easily go over 150 Khash/s with more GPU overclocking and increasing the intensity level. I haven't tried to push the card that far since increase core speed make temperature go over the roof.

How to get all results without the first row from a MySQL table

noreply@blogger.com (my node) — Wed, 05 Feb 2014 20:32:00 +0000

To exclude first row you have to use MySQL limit clause.

select * from table limit 1, 10000000

You can pass 2 values to limit clause first one is the starting row. Row index start with 0 so you have to put 1 to remove first row. Second parameter is the number of result u need to retrieve. Put a number that is larger than max rows of table.

Disable other_vhosts_access.log in ubuntu

noreply@blogger.com (my node) — Sat, 14 Sep 2013 19:14:00 +0000

Check the following location for apache2.conf and other-vhost-access-log
/etc/apache2/apache2.conf
/etc/apache2/conf.d/other-vhost-access-log

Open those files and check for the line with other_vhosts_access.log and comment them out with # sign in front of the line.

Restart Apache.

Fixing MP4 not playing until full video loads in browser

noreply@blogger.com (my node) — Sun, 31 Mar 2013 20:32:00 +0000

I had a problem where my mp4 videos were not played by video.js player until the video was fully downloaded by the browser. after some searching I found out it was because mp4 file metadata ( moov atom) is on the end of the file and the player cannot locate it for streaming when initially played.

I was saved by this small php library http://code.google.com/p/moovrelocator/
This will read a video and move MOOV-Atom to the front of the mp4 file.

there is a demo in _demo folder. if you get errors finding the paths, try giving direct paths like this in index.php

$inFile = '../../videos/'.$tempv;
// output (processed file)
$outFile = '../../new_videos/'.$tempv;

if you get zend errors try giving direct paths in Moovrelocator.class.php

// atom poc class
require_once 'atom/Atom.class.php';

// bytearray to operate direct on bytes in memory just to simulate Adobe's AS3 Bytearray
require_once 'bytes/Bytearray.class.php';

// transform (taken from php-reader)
require_once 'bytes/Transform.class.php';

you may also want to change your php.ini max execute time and memory use if you are looping through lot of videos in a folder.

php file upload error messages in a php array

noreply@blogger.com (my node) — Sat, 27 Oct 2012 19:52:00 +0000

Hope this will be useful to someone, all the php file upload error codes and messages in an array.

<?php

$error_codes = array(
        0=>"There is no error, the file uploaded with success",
        1=>"The uploaded file exceeds the upload_max_filesize directive in php.ini",
        2=>"The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form",
        3=>"The uploaded file was only partially uploaded",
        4=>"No file was uploaded",
        6=>"Missing a temporary folder",
        7=>"Failed to write file to disk",
        8=>"A PHP extension stopped the file upload"
);

/* Posssible Usage */

if($_FILES["userfile"]["error"] > 0){
   
  $code = $_FILES["userfile"]["error"];
  echo $error_codes[$code];
}
else{
 
 //do the processing
}
 
?>

How to change default timezone in Ubuntu command-line

noreply@blogger.com (my node) — Tue, 23 Oct 2012 13:15:00 +0000

In a Ubuntu / Debian based Linux system you can use the following command to run the timezone setup to change the default timezone

dpkg-reconfigure tzdata

High Swapping On Linode 512 - KeepAliveTimeout

noreply@blogger.com (my node) — Sun, 21 Oct 2012 19:56:00 +0000

I thought of sharing my experience on handling the high swapping issue I faced recently. There is nothing wrong with Linode service, its just my dumb Apache configurations.

Linode is a great hosting service but for a Linux administration newbie it can be a challenging place.

Swapping problem was a nightmare, I tried adding another 512MB to the Linode box and still it goes into full swap. Then I get to know about the Apache KeepAliveTimeout.

KeepAliveTimeout - Amount of time the server will wait for subsequent requests on a persistent connection.

Unfortunately for me the default value was 15 which is a super high value. After changing the value to 4 all was smooth again.

Swapping can occur for many reasons like bad scripting but KeepAliveTimeout value can be a main suspect :)

How to check and fix Domain Canonicalization (www)

noreply@blogger.com (my node) — Tue, 16 Oct 2012 12:08:00 +0000

It's a common configuration in web servers to point both urls of www.example.com and example.com to same content. This is a bad practice in terms of SEO because they regarded as duplicate content. If you have access to the .htaccess and assuming your Apache server has mod_rewrite enabled, you can add following lines to redirect traffic and issue a 301 (Moved Permanently).
I prefer my site addresses without www

RewriteEngine On

RewriteCond %{HTTP_HOST} !^example.com [NC]

RewriteRule ^(.*)$ http://example.com/$1 [L,R=301]

If you like to have your addresses with www use the following

RewriteEngine On

RewriteCond %{HTTP_HOST} !^www.example.com [NC]

RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

If you have any sub domains like blog.example.com do not use the above code.

How to find MPM mode of Apache - Prefork or Worker

noreply@blogger.com (my node) — Tue, 07 Aug 2012 03:27:00 +0000

to find the Apache MPM mode you can simply run following command.

in Ubuntu u can try

apache2 -V

in CentOS type of linux u can try

httpd -V

How to fix gd-jpeg, libjpeg: recoverable error: Premature end of JPEG file

noreply@blogger.com (my node) — Thu, 10 Feb 2011 07:18:00 +0000

Sometimes php will through a error when using the imagecreatefromjpeg() for some jpge images saved by cameras and photo editing softwares. When I search the internet for a solution I found this great article which fix the problem http://worcesterwideweb.com/2008/03/17/php-5-and-imagecreatefromjpeg-recoverable-error-premature-end-of-jpeg-file/

How to loop A-Z in php

noreply@blogger.com (my node) — Thu, 13 Jan 2011 13:33:00 +0000

Just like counting numbers :)

$letter = "A";
for($i = 1; $i<= 26; $i++)
{
  $letter++;
  echo $letter;
}

Cannot make the website html validate? try HTML Tidy

noreply@blogger.com (my node) — Fri, 24 Sep 2010 20:52:00 +0000

Sometimes you cannot seems to find the line where the validation errors come from. In such cases you can try using HTML Tidy to do a auto clean up.

W3C Markup Validation Service also has this option. or you an check out the project page.

http://tidy.sourceforge.net/

Magento Video Tutorials: Thanks Armando Roggio :)

noreply@blogger.com (my node) — Tue, 07 Sep 2010 10:39:00 +0000

Cannot express how greatful I am to this guy. http://www.ecommercedeveloper.com/articles/1540-Building-a-Magento-Theme-Start-to-Finish-Part-One-Prolegomena

I tried to start Magento several times and just got frustrated with the issues with locahost and complex nature of the file structure.
but thanks to above tutorial Magento is like riding a bike.

Videos are on version 1.3 but after reading this note about version 1.4 you can follow the tutorials easily on 1.4

Magento's Theme Hierarchy--Changes in CEv1.4 and EEv1.8

Mangento Sample Data - 404 Page Error

noreply@blogger.com (my node) — Thu, 02 Sep 2010 10:14:00 +0000

I see few solutions for this error in the web but for me following steps corrected my error.
Magento Version - 1.4.1.1

Admin -> System -> Index Management -> Reindex all given Indexes

Sri Lanka District and City List Sql File

noreply@blogger.com (my node) — Wed, 01 Sep 2010 19:57:00 +0000

For a recent project I had to find all the Sri Lankan District and related Cities to populate in two drop downs. The list is not fully complete and Kilinochchi District is not in the list.
Districts - 24
Cities - 2044

Two tables, city table refer district table by did.

Download Sri Lankan District - City Sql file

You can easily import this sql file to mysql using phpmyadmin.

Mysql insert multiple/batch of rows using single query

noreply@blogger.com (my node) — Tue, 31 Aug 2010 18:05:00 +0000

You don't need to loop a mysql insert query to add multiple records to a table. mysql insert support multiple inserts in one query.

Let say you have a table called students with two fields fname and age.

insert into students (fname, age) values
('Kusal', '26'),
('Tom', '18'),
('Ann', '23')

Remember to give the column names in the query.

Quick, Simple and Easy Image Gallery Using jQuery

noreply@blogger.com (my node) — Mon, 30 Aug 2010 21:53:00 +0000

This is a simple image gallery I wrote for a project. Its small and easy to implement. Ideal if you need to build a simple and quick gallery.
You can improve the code by adding a loading.gif

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>How to add table rows using jQuery</title>
<style>
.thumb{vertical-align:top; padding:2px; border:1px #CCC solid;}
</style>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>

$(document).ready(function(){    
    
    $(".image").click(function() {    
        //$('#main').hide();
        var image = $(this).attr("href");
        $('#main').attr("src", image);
                
        $('#main').load(function() {            
              $('#main').fadeIn('slow');
        });
        
    return false;
    });
});    

</script>
</head>

<body>
<a href="images/image1.jpg" class="image"><img alt="Image1" src="thumb/image1.jpg" class="thumb" border="0"/></a>
<a href="images/image2.jpg" class="image"><img alt="Image2" src="thumb/image2.jpg" class="thumb" border="0"/></a>
<a href="images/image3.jpg" class="image"><img alt="Image3" src="thumb/image3.jpg" class="thumb" border="0"/></a>
<a href="images/image4.jpg" class="image"><img alt="Image4" src="thumb/image4.jpg" class="thumb" border="0"/></a>
<div id="container" style="height:400px; padding-top:20px;"><img id="main" src="images/image1.jpg" /></div>

</body>
</html>

View Demo

Wait till a dynamically loaded image fully load using jQuery

noreply@blogger.com (my node) — Sun, 29 Aug 2010 17:17:00 +0000

I had this problem when I was creating simple jQuery gallery with thumbs. Once the thumb is clicked I wanted to wait till the image is fully loaded until I called the fadeIn.
we can use jQuery load to achieve this.

$('#image').hide();
$('#image').attr("src", image); //next image path
//still in hide
$('#image').load(function() {    
    $('#image').fadeIn('slow');
});

How to round numbers in JavaScript

noreply@blogger.com (my node) — Sat, 28 Aug 2010 20:59:00 +0000

JavaScript number rounding is done using Math.round
This will round a given number to the nearest whole number

<script type="text/javascript">

var number = 100.58;
number = Math.round(number);
alert(number); //101

</script>

If you do need some decimal points preserved, following code will round the number to the nearest tenth.

<script type="text/javascript">

var number = 100.58;
number = Math.round(number*10)/10;
alert(number); //100.6

</script>

Javascript Go Back Link With History

noreply@blogger.com (my node) — Sat, 28 Aug 2010 18:44:00 +0000

Here is a really easy way to add a go back link to your page navigation.
This code uses JavaScript to get the browser history for the specific site.

<a href="#" onClick="history.go(-1)">Back</a> 
<input type=button value="Back" onClick="history.go(-1)">

You can change the -1 to any number of pages you need to go back in history :D