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Ethereum Programming Language

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Solidity: The Programming Language of Ethereum Blockchain technology has revolutionized various industries by introducing decentralized and secure applications. Ethereum, one of the leading blockchain platforms, has gained immense popularity due to its ability to support smart contracts, which enable the execution of self-executing code with predefined rules. To write these smart contracts, developers use Solidity, a high-level, contract-oriented programming language specifically designed for Ethereum. In this article, we will explore Solidity in detail, including its features, syntax, use cases, advantages, and challenges. 1. Introduction to Solidity Solidity was introduced by Gavin Wood in 2014 and is the primary language for developing smart contracts on the Ethereum platform. It is a statically-typed language that supports inheritance, libraries, and complex user-defined types. Solidity code is compiled into bytecode, which can be executed on the Ethereum Virtual Machine (EVM), mak...
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Convert excel to CSV file using PHP, Linx Server

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How to convert xls file into csv file using php or LAMP, Look at simple example to convert excel to csv file using php on linux server. <?php require_once 'Excel/reader.php'; $excel = new Spreadsheet_Excel_Reader(); $excel->setOutputEncoding('CP1251'); $excel->read('b.xls'); $x=1; $sep = ","; ob_start(); while($x<=$excel->sheets[0]['numRows']) { $y=1; $row=""; while($y<=$excel->sheets[0]['numCols']) { $cell = isset($excel->sheets[0]['cells'][$x][$y]) ? $excel->sheets[0]['cells'][$x][$y] : ''; $row.=($row=="")?"\"".$cell."\"":"".$sep."\"".$cell."\""; $y++; } echo $row."\n"; $x++; } $fp = fopen("data.csv",'w'); fwrite($fp,ob_get_contents()); fclose($fp); ob_end_cl...
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Set php.ini values into .htaccess file

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How can i set php.ini configuration values into .htaccess file? Here is the simple solution to set php.ini variables into .htaccess file. Syntax non flag variables. php_value setting_name setting_value Example : php_value upload_max_filesize 10M Syntax for flag variables such as (on/off). php_flag [variable_name] [value] Exmaple : php_flag register_globals off
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Send HTML Form Elements Value Without Using Form Tag

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How to send form components value without using Form Tag in HTML, ? This example will help your to send HTML elements value from one page to another page without using HTML Form Tag. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT=""> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> </HEAD> <BODY> <script language="javascript"> function goFor(){ var ele = document.getElementById("URL"); if(ele.value==""){ alert("Please Enter URL."); }else{ location.href="http://www.google.com?q="+ele.value; } } </script...
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How to Replace All in Javascript

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How to replace all string using javascript replace function... Here is simple example replace all in javascript in replace string method. CODE: <Script Language="javascript"> var str = "This is the test string."; var rs = str.replace(/is/g,""); document.write(st); // result "Th the test string." </Script>
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How to send variables from on SWF flex file to another SWF file Using Flex.

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How to Communicate From one SWF Flex file to another SWF Flex File ? See the below example, This is loading external swf flex file into parent SWF File and sharing the data or variable from parent to child and child to parent. Parent.mxml CODE: 1: <?xml version="1.0" encoding="utf-8"?> 2: <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="100%"> 3: <mx:Script> 4: <![CDATA[ 5: import mx.events.CloseEvent; 6: import mx.controls.SWFLoader; 7: import mx.managers.PopUpManager; 8: import mx.containers.TitleWindow; 9: import mx.controls.Alert; 10: 11: public var tw:SWFPlaceHolder; 12: 13: public function launchExternalSWF(title:String,swfFilePath:String):void{ 14: 15: /...
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How To Read RSS Using PHP

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Here is the simple code to read RSS Feeds using php with simpladxml_load_string function. CODE: 1 :   <?php 2 :        $displayItems = 5; 3 :        $itemCounter = 0; 4 :        $rss = simplexml_load_file("http://put here url of RSS Feed"); 5 :        foreach($rss->channel->item as $feeds){ 6 :             $itemCounter++; 7 :             echo '<li><a href="'.$feeds->link.'">'.$feeds->title.'</a><br /><br />'; 8 :             if($itemCounter==$displayItems)break; 9 :        } 10 :   ?>
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How to Check Local Machine Name and IP Address Using C#

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How to check client Machine or local Machine Name and IP address using C-sharp, See the below simple example code. CODE: 1 : using System.Net; 2 : 3 : string hostName = Dns.GetHostName(); 4 : IPHostEntry ie = Dns.GetHostByName(hostName); 5 : IPAddress[] ia= ie.AddressList; 6 : 7 : MessageBox.Show("Local Machine Name : "+hostName.ToString()); 8 : MessageBox.Show("IP address Of Local Machine "+ipAddress[0].ToString());
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How to Check Internet Connection Using C-Sharp

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How to check internet connection using c#? Here is a simple example to find out internet connection or page response using c -Sharp CODE: 1 : Using System.Net ; 2 : try{ 3 : HttpWebRequest request= (HttpWebRequest) HttpWebRequest.Create("google.com"); 4 : HttpWebResponse response= (HttpWebResponse) request.GetResponse(); 5 : if (HttpStatusCode.OK == response.StatusCode) 6 : { 7 : //Write here your code... 8 : response.Close(); 9 : } 10 : }catch (Exception ex){ 11 : MessageBox.Show("Unable to connect"); 12 : }
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How to Format My Source Code For Blogger ?

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How to format my source code for blogger, blog, Blogging, weblog & website ? Now you can format you source code for blogger, blog, Blogging, weblog & website using online source code formatter. This application build in javascript. This source code beautifier or formatter provide for your blogger, Blog and websites a good code indentation. You can can format your source code with alternative background using <pre> tag. It does not add unnecessary tags in formatted source code excpet <pre> and <code> so just try onto your source code for blog or blogging & website posts . This is absolutly free online line source code formatter tool for your blogger & website. http://codeformatter.blogspot.com/ See example.. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT=""> <META NAME="A...
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Search Records into XML Using PHP

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There is an example for search items or block into xml using php with simplexml_load_string method or function, this will return you record block for particular query. query = us CODE: 1 :   <?php 2 :        # parm query=delhi , us 3 :        $xmlStr = '<?xml version="1.0" encoding="utf-8"?> 4 :                            <temprature> 5 :                            <item> 6 :                                 <city>Bareilly</city> 7 :    ...
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Center Alignment of popup window Javascript

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How to centralized popup window using Javascript. see the below code. CODE: 1 :   var OpenWindows = new Object(); 2 :   function OpenWin(sPath, w, h) 3 :   { 4 :        l = (screen.width - w)/2-5; 5 :        t = (screen.height - h)/2-20; 6 :        if (l<1) l=0; 7 :        if (t<1) t=0; 8 :        sWindowName = "mainwin_" + w + "_" + h; 9 :        if(OpenWindows[sWindowName]) { 10 :             if(!OpenWindows[sWindowName].closed) OpenWindows[sWindowName].close(); 11 :        } 12 :        OpenWindows[sWindowName] = window.open(sPath, sWindowName, "left=" + l + ",top=" + t + ",width=" + w + ",height=" + h + ",scrollb...
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How To Change Form Action at Runtime

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How to change Form action at runtime using javascript. This the example which will change html form action at runtime. CODE: 1 :   <html> 2 :   <head> 3 :   <Script Language="javascript"> 4 :   function change_action(){ 5 :   var frm_obj=document.getElementById("frm"); 6 :   frm_obj.action="http://www.google.com"; 7 :   } 8 :   </Script> 9 :   </head> 10 :   <body> 11 :   <form id="frm" action="abc.php" method="post" onsubmit="return change_action()"> 12 :   UID &nbsp;&nbsp;<input type="text"><br> 13 :   PWD <input type="Password"><br><br> 14 :   <input type="submit" value="submit"> 15 :   </form> 16 :   </body> 17 :   </html>
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Change Div Position Randomly on Home Page

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Change Div position randomly on home page.here is simple example which display a div randomly on homepage within available width and hight. CODE: 1 :   <Script Langauge="javscript"> 2 :   var load=true; 3 :   var div_width=300; 4 :   var div_height=200; 5 :   var top=Math.floor(Math.random()*screen.availHeight - div_height) 6 :   var left=Math.floor(Math.random()*screen.availWidth - div_width) 7 :   document.write("<div id='pic_div' style='border:1px solid black;position:absolute;width:"+div_width+";height:"+div_height+"; 8 :   text-align:center;left:0px;top:0px'>a</div>"); 9 :   var d_obj=document.getElementById("pic_div"); 10 :   d_obj.style.top=top; 11 :   d_obj.style.left=left; 12 :   </script>
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Free Online Meta Tag Creator

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Meta Tags are HTML header part tags, which describe about the website . These meta tags provide information to the search engines such as Google, Yahoo, MSN Search, AOL Search, AltaVista ,HotBot, Lycos, Excite and other search engines . It is very important to the search engine point of view meta tags must be well formed and meaningful . HTML Meta tags help to increase your website rank. The common questions arise for meta tags are as follows? What Are META Tags? META Tags are HTML header part tags of HTML Document that provide internal & external information about the content of a web page or website while you are browsing that page you are not able to see that Meta tags on your browser output. How META Tags Work for Search Engine? Meta tag tell to search about the page such as keywords, Description, Content Language etc, which parameter you put in contents attribute of the meta tags that's is read by search engine to index your page with accuracy, which is totally depend to...
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Use FilterFunction in Flex ArrayCollection

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Here is the simple Flex ArrayCollection FilterFunction example to ignore blank records (name) form arrayCollection. var ac=new ArrayCollection(); ac.addItem({name:'abc'}); ac.addItem({name:'xyz'}); ac.addItem({name:''}); ac.addItem({name:'dac'}); // use of fillter function ac.filterFunction = function(item:*):Boolean{ return (StringUtill.trim(item.name)!=""); // } ac.refresh(); Now filtered ArrayCollection object use further code.
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