w3mentor

connect asynchronously to sql server

admin — Thu, 28 Mar 2013 18:00:50 +0000

readonly string ConnectionString = "Data Source=database_server_name;Initial Catalog=Store;Integrated Security=True"; protected async void ExecuteCommandAsync() { using (SqlConnection con = new SqlConnection(ConnectionString)) { await con.OpenAsync(); } }

Test for websockets support in browser

admin — Thu, 28 Mar 2013 17:40:37 +0000

if (window.WebSocket){ console.log("This browser supports WebSocket!"); } else { console.log("This browser does not support WebSocket."); }

websockets bufferedAmount example

admin — Thu, 28 Mar 2013 17:38:56 +0000

// 10k max buffer size. var THRESHOLD = 10240; // Create a New WebSocket connection var ws = new WebSocket("ws://w3mentor.com"); // Listen for the opening event ws.onopen = function () { // Attempt to send update every second. setInterval( function() { // Send only if the buffer is not full if (ws.bufferedAmount [...]

Test if two matrices are equal in C#

admin — Thu, 06 Dec 2012 19:56:18 +0000

static bool areMatricesEqual(double[][] matrixOne, double[][] matrixTwo, double delta) { int aRows = matrixOne.Length; int bCols = matrixTwo[0].Length; for (int i = 0; i < aRows; ++i) // each row of One and Two for (int j = 0; j < bCols; ++j) // each col of One and Two if (Math.Abs(matrixOne[i][j] - matrixTwo[i][j]) > [...]

Create identity matrix in C#

admin — Thu, 06 Dec 2012 19:53:00 +0000

static double[][] IdentityMatrix(int n) { double[][] result = CreateMatrix(n, n); for (int i = 0; i < n; ++i) result[i][i] = 1.0; return result; } static double[][] CreateMatrix(int rows, int cols) { double[][] result = new double[rows][]; for (int i = 0; i < rows; ++i) result[i] = new double[cols]; return result; }

Parallel matrix multiplication in C# using task parallel library

admin — Thu, 06 Dec 2012 19:50:58 +0000

static double[][] MatrixMultiplication(double[][] matrixOne, double[][] matrixTwo) { //aRows = rows in matrixOne //bCols = columns in matrixTwo double[][] result = CreateMatrix(aRows, bCols); Parallel.For(0, aRows, i => { for (int j = 0; j < bCols; ++j) for (int k = 0; k < aCols; ++k) result[i][j] += matrixOne[i][k] * matrixTwo[k][j]; } ); return result; } [...]

Matrix multiplication in C#

admin — Thu, 06 Dec 2012 19:47:14 +0000

static double[][] MatrixMultiplication(double[][] matrixOne, double[][] matrixTwo) { int aRows = matrixOne.Length; int aCols = matrixOne[0].Length; int bRows = matrixTwo.Length; int bCols = matrixTwo[0].Length; if (aCols != bRows) throw new Exception("Out of shape matrices"); double[][] result = CreateMatrix(aRows, bCols); for (int i = 0; i < aRows; ++i) // each row of MatrixOne for (int j [...]

Create matrix in C#

admin — Thu, 06 Dec 2012 19:43:03 +0000

static double[][] CreateMatrix(int rows, int cols) { double[][] result = new double[rows][]; for (int i = 0; i < rows; ++i) result[i] = new double[cols]; // return result; } double[][] m = CreateMatrix(4,3);

TreeMap in Java

admin — Thu, 06 Dec 2012 15:31:50 +0000

import java.util.TreeMap; public class dimensionsExample { public static void main(String[] args) { TreeMap<String,String> dimensions = new TreeMap<String,String>(); dimensions.put("NC", "2333"); dimensions.put("NY", "2334"); dimensions.put("SC", "2335"); dimensions.put("CA", "2336"); System.out.println("CA: " + dimensions.get("CA")); dimensions.put("AZ", "2337"); System.out.println("Size of dimensions: " + dimensions.size()); dimensions.remove("SC"); System.out.println("Size of dimensions: " + dimensions.size()); } }

HashMap in Java

admin — Thu, 06 Dec 2012 15:30:10 +0000

import java.util.HashMap; public class prices { public static void main(String[] args) { HashMap<String,Integer> prices = new HashMap<String,Integer>(); prices.put("walmart", 88); prices.put("target", 100); prices.put("kmart", 77); prices.put("lowes", 90); System.out.println("walmart's price: " + prices.get("walmart")); System.out.println("Number of prices: " + prices.size()); if (prices.containsKey("target")) { prices.remove("target"); System.out.println("Record successfully removed."); } System.out.println("number of prices: " + prices.size()); } }

Use TreeSet to parse sentences for word count in Java

admin — Thu, 06 Dec 2012 15:27:36 +0000

import java.util.TreeSet; public class WordList { public static void main(String[] args) { String text; text = "Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, " + "when an unknown printer took a galley of type and scrambled it to make a type specimen book " + "It has survived [...]

HashSet in Java

admin — Thu, 06 Dec 2012 15:24:02 +0000

import java.util.HashSet; public class myHashsetExample { public static void main(String[] args) { HashSet<String> languages = new HashSet<String>(); languages.add("hindi"); languages.add("english"); languages.add("spanish"); System.out.println("The number of languages is " + languages.size()); for (String name : languages) { System.out.println(name); } languages.remove("hindi"); languages.add("tamil"); String name = "hindi"; if (languages.contains(name)) { System.out.println(name + " is in the collection."); } else [...]

PriorityQueue in Java

admin — Thu, 06 Dec 2012 15:21:53 +0000

import java.util.PriorityQueue; public class Cars { public static void main(String[] args) { PriorityQueue<String> car = new PriorityQueue<String>(); car.add("lincoln"); car.add("ford"); car.add("suzuki"); car.add("toyota"); car.add("nissan"); System.out.println("The car: "); for (String name : car) { System.out.println(name); } car.poll(); System.out.println("The car: "); for (String name : car) { System.out.println(name); } car.remove("suzuki"); System.out.println("The car: "); for (String name : car) [...]

TreeSet in Java

admin — Thu, 06 Dec 2012 15:20:07 +0000

import java.util.TreeSet; public class myTreeSet { public static void main(String[] args) { TreeSet<String> animals = new TreeSet<String>(); animals.add("Dog"); animals.add("Cat"); animals.add("Sparrow"); animals.add("Iguana"); animals.add("Dragon"); animals.add("Peacock"); System.out.println("Number of animals = " + animals.size()); for (String name : animals) { System.out.println(name); } System.out.println("Animal before Sparrow: " + animals.lower("Sparrow")); System.out.println("Animal after Sparrow: " + animals.higher("Sparrow")); System.out.println("First element: " + [...]

Arraylist in Java

admin — Thu, 06 Dec 2012 15:17:58 +0000

import java.util.ArrayList; public class myArrayList { public static void main(String[] args) { ArrayList<Integer> vals = new ArrayList<Integer>(); vals.add(100); vals.add(90); vals.add(80); vals.add(70); vals.add(60); int total = 0; /*for(int i = 0; i < vals.size(); ++i) { total += vals.get(i); }*/ for (Integer val : vals) { total += val; } double average = total / [...]

Working with tuples in C#

admin — Sun, 02 Dec 2012 23:32:50 +0000

public static Tuple<int, string> GenerateTuple() { return Tuple.Create(1, "my site"); } var tupp = GenerateTuple(); Console.WriteLine(tupp.GetType()); Console.WriteLine("{0}:{1}", tupp.Item1, tupp.Item2);

What are c# Tuples?

admin — Sun, 02 Dec 2012 23:30:56 +0000

In C#, a tuple represents a set of data in a single data structure. Tuples can: 1. Provide easy access and manipulation of a set of data. 2. Return multiple values from a method. 3. Pass multiple values to a method in a single parameter. Example: var myTuple = Tuple.Create("w3mentor", new DateTime(2009, 12, 8)); Console.WriteLine("{0} [...]

Common types of events in jQuery

admin — Sun, 02 Dec 2012 23:24:51 +0000

.blur() .change() .click() .dblclick() .error() .focus() .focusin() .focusout() .hover() .keydown() .keypress() .keyup() .load() .mousedown() .mouseenter() .mouseleave() .mousemove() .mouseout() .mouseover() .mouseup() .ready() .resize() .scroll() .select() .submit() .unload()

Bind event to event handler in jquery

admin — Sun, 02 Dec 2012 23:23:41 +0000

change text decoration css using jquery

admin — Sun, 02 Dec 2012 23:18:16 +0000

<head> <script type="text/javascript" src="jquery-1.7.21.7.2.js"> </script> <script type="text/javascript"> /* <![CDATA[ */ $(document).ready(function(){ $("#mylink").mouseover(function(){ $(this).css("textDecoration", "underline"); }); $("#mylink").mouseout(function(){ $(this).css("textDecoration", "none"); }); }); /* ]]> */ </script> </head> <body> <p><a id="mylink" href="http://w3mentor.com" style="text-decoration: none"> w3mentor.com</a></p> </body>

Populating Android ListView from Java

admin — Wed, 21 Nov 2012 15:47:24 +0000

Android TableLayout with ImageView

admin — Wed, 21 Nov 2012 15:43:41 +0000

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="States of The USA" /> <TableLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <TableRow> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/california" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/nevada" /> <ImageView android:id="@+id/imageView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/washington" /> <ImageView android:id="@+id/imageView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ohio" /> </TableRow> <TableRow> [...]

Android RelativeLayout example

admin — Wed, 21 Nov 2012 15:40:56 +0000

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/wrapperLayout" android:layout_width="fill_parent" android:layout_height="fill_parent" > <RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="3dp"> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="User Name:" /> <EditText android:id="@+id/editText1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" > </EditText> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editText1" android:layout_below="@+id/editText1" android:text="Passoword" /> <EditText android:id="@+id/editText2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editText1" android:layout_below="@+id/textView2" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" [...]

Android LinearLayout example

admin — Wed, 21 Nov 2012 15:39:33 +0000

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:gravity="center_vertical"> <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="White" android:textAppearance="?android:attr/textAppearanceLarge" android:background="@color/White" android:textColor="#000000" android:gravity="center_horizontal" android:layout_weight=".5"/> <TextView android:id="@+id/textView2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Green" android:textAppearance="?android:attr/textAppearanceLarge" android:background="@color/Green" android:gravity="center_horizontal" android:layout_weight=".16"/> <TextView android:id="@+id/textView3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Yellow" android:textAppearance="?android:attr/textAppearanceLarge" android:background="@color/Yellow" android:textColor="#000000" android:gravity="center_horizontal" android:layout_weight=".16"/> <TextView android:id="@+id/textView4" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Red" android:textAppearance="?android:attr/textAppearanceLarge" android:background="@color/Red" android:gravity="center_horizontal" android:layout_weight=".16"/> </LinearLayout>

simple string search in php

admin — Thu, 15 Nov 2012 19:58:16 +0000

<?php $string_to_search = "w3mentor.com"; $regex = "/tor/"; $num_matches = preg_match($regex, $string_to_search); if ($num_matches > 0) { echo "Found a match!"; } else { echo "No match. Sorry."; } ?>

Create maximizable, resizable ExtGWT Window

admin — Tue, 18 Sep 2012 18:22:20 +0000

@Override public void onModuleLoad() { // create and set up window Window basicWindow = new Window(); basicWindow.setHeading("My maximizable, resizable ExtGWT Window"); basicWindow.setClosable(true); basicWindow.setSize(150, 100); xWindow.setDraggable(true); xWindow.setResizable(true); xWindow.setMaximizable(true); xWindow.setModal(true); xWindow.setBlinkModal(true); // prepare content to show LayoutContainer textPanel = new VerticalPanel(); textPanel.setStyleAttribute("padding", "10px"); textPanel.addText("This is my maximizable, resizable ExtGWT Window ..."); // add content [...]

Display basic window using Ext GWT

admin — Tue, 18 Sep 2012 18:19:11 +0000

@Override public void onModuleLoad() { // create and set up window Window basicWindow = new Window(); basicWindow.setHeading("My ExtGWT Window"); basicWindow.setClosable(true); basicWindow.setSize(150, 100); // prepare content to show LayoutContainer textPanel = new VerticalPanel(); textPanel.setStyleAttribute("padding", "10px"); textPanel.addText("This is my window ..."); // add content and show window basicWindow.add(textPanel); basicWindow.show(); }

LINQ Queries to Nongeneric Collections in C#

admin — Fri, 07 Sep 2012 16:05:11 +0000

static void Main(string[] args) { ArrayList myBikes = new ArrayList() { new Bike{ PetName = "bike1", Color = "Silver", Speed = 100, Make = "BMW"}, new Bike{ PetName = "bike2", Color = "Tan", Speed = 90, Make = "BMW"}, new Bike{ PetName = "bike3", Color = "Black", Speed = 55, Make = "Yamaha"}, new Bike{ [...]

Applying LINQ Queries to Collection Objects in C#

admin — Fri, 07 Sep 2012 16:02:02 +0000

class Bike { public string Name {get; set;} public string Color {get; set;} public int Speed {get; set;} public string Make {get; set;} } static void Main(string[] args) { Console.WriteLine("***** LINQ over Generic Collections *****\n"); // Make a List<> of Bike objects. List<Bike> myBikes = new List<Bike>() { new Bike{ PetName = "bike1", Color [...]

Using Indexer Definitions in C# Interfaces

admin — Fri, 07 Sep 2012 15:25:33 +0000

Interface with Indexer: public interface IStringDef { string this[int index] { get; set; } } Class implementing the interface: class MyClass : IStringDef { private List<string> allStrings = new List<string>(); public string this[int index] { get { return allStrings[index]; } set { allStrings.Insert(index, value); } } }

Indexing Data Using String Values in C#

admin — Fri, 07 Sep 2012 15:21:58 +0000

public class PersonCollection : IEnumerable { private Dictionary<string, Person> listOfPeople = new Dictionary<string, Person>(); // This indexer returns a person based on a string index. public Person this[string name] { get { return (Person)listOfPeople[name]; } set { listOfPeople[name] = value; } } public void ClearPeople() { listOfPeople.Clear(); } public int Count { [...]

Indexer Methods in C#

admin — Fri, 07 Sep 2012 15:19:18 +0000

// Indexers allow you to access items in an array-like fashion. class Program { static void Main(string[] args) { PersonCollection allPeople = new PersonCollection(); // Add objects with indexer syntax. allPeople[0] = new Person("Homer", "Simpson", 40); allPeople[1] = new Person("Marge", "Simpson", 38); allPeople[2] = new Person("Lisa", "Simpson", 9); allPeople[3] = new Person("Bart", "Simpson", [...]

Using the index operator in a simple array

admin — Fri, 07 Sep 2012 15:16:30 +0000

static void Main(string[] args) { // Loop over incoming command-line arguments // using index operator. for(int i = 0; i < args.Length; i++) Console.WriteLine("Args: {0}", args[i]); // Declare an array of local integers. int[] myInts = { 10, 9, 100, 432, 9874}; // Use the index operator to access each element. for(int j [...]

Open file for read/write operation in binary mode

admin — Tue, 14 Aug 2012 19:56:22 +0000

# include <stdio.h> # include <conio.h> # include <process.h> void main() { FILE *fp; char c=' '; clrscr(); fp=fopen("mydata.dat","wb"); if (fp==NULL) { printf("Can not open file"); exit(1); } printf("Press '.' to exit:"); while(c!='.') { c=getche(); fputc(c,fp); } fclose(fp); fp=fopen("mydata.dat","rb"); printf("\n Contents read :"); while(!feof(fp)) printf("%c",getc(fp)); }

Open a file in append mode in C

admin — Tue, 14 Aug 2012 19:53:38 +0000

# include <stdio.h> # include <conio.h> # include <process.h> void main() { FILE *fp; char c=' '; clrscr(); fp=fopen("mydata.txt","a+"); if(fp==NULL) { printf("Can not open file"); exit(1); } printf("Press '.' to exit:"); while(c!='.') { c=getche(); fputc(c,fp); } printf("\n Contents read :"); rewind(fp); while(!feof(fp)) printf("%c",getc(fp)); }

Use w+ mode for writing and reading a file in C

admin — Tue, 14 Aug 2012 19:52:15 +0000

# include <stdio.h> # include <conio.h> # include <process.h> void main() { FILE *fp; char c=' '; clrscr(); fp=fopen("mydata.txt","w+"); if(fp==NULL) { printf("Can not open file"); exit(1); } printf("press '.' to exit :"); while(c!='.') { c=getche(); fputc(c,fp); } rewind(fp); printf("\n Contents read :"); while(!feof(fp)) printf("%c",getc(fp)); }

Open pre-existing file and append string to file in C

admin — Tue, 14 Aug 2012 19:50:42 +0000

# include <stdio.h> # include <conio.h> # include <process.h> void main() { FILE *fp; char c; clrscr(); printf("File before appending :\n"); fp=fopen("mydata.txt","r"); while(!feof(fp)) { c=fgetc(fp); printf("%c",c); } fp=fopen("mydata.txt","a"); if(fp==NULL) { printf("File can not appended"); exit(1); } printf("\n Enter string to append :"); while(c!='.') { c=getche(); fputc(c,fp); } fclose(fp); printf("\n File [...]

program to write data to text file and read in C

admin — Tue, 14 Aug 2012 19:47:51 +0000

# include <stdio.h> # include <conio.h> # include <process.h> void main() { FILE *fp; char c=' '; clrscr(); fp=fopen("mydata.txt","w"); if(fp==NULL) { printf("Can not open file mydata.txt"); exit(1); } printf("Write data, press '-' to exit:"); while(c!='-') { c=getche(); fputc(c,fp); } fclose(fp); printf("\n Contents read :"); fp=fopen("mydata.txt","r"); while(!feof(fp)) printf("%c",getc(fp)); }

Mongodb connection in Python

admin — Thu, 14 Jun 2012 15:14:14 +0000

from pymongo import Connection connection = Connection(‘localhost’, 27017) db = connection.mydb collection = db.mycollection for doc in collection.find(): doc

Connect to mongodb in PHP

admin — Thu, 14 Jun 2012 15:11:48 +0000

$connection = new Mongo( “localhost:27017” ); $collection = $connection->mydb->mycollection; $cursor = $collection->find(); foreach ($cursor as $id => $value) { echo “$id: “; var_dump( $value ); }

Insertion sort example in C

admin — Mon, 21 May 2012 16:48:25 +0000

/* */ # define n 6 int x[]={4, 3, 6, 2, 8, 9}; main( ) { int I, t, j,. printf(“\n\n Input data: \n \n”); for(I=0; I<n; I++) printf(*%3d*, x[I]); printf(*\n*); for I=1; I<n; I++) for(j=1, j>0 && x[j]<x[j-1]; j — —) { t=x[j]; x[j]=x[j-1]; x[j-1]=t; } printf(“\n\n Output data: \n \n”); for(I=0; I<6; I++) [...]

Size of array in C

admin — Mon, 21 May 2012 16:46:43 +0000

#include <stdio.h> #define N 5 /* Size of array */ main( ) { int A[N]; /* Space for A[0].........A[4] is allocated */ int j,sum=0; for(i=0; i<N; i++) A[i]=i*i; /* Initialize the array */ for(i=0;i<N; i++) /* Display array elements */ printf(“ A[%d]=%d”, i, A [i] ); for(i =0; i <N; ++i) /* Find total */ [...]

Dimension resource file in Android

admin — Tue, 24 Apr 2012 16:58:44 +0000

Store the resource file in /res/values/dimens.xml <?xml version="1.0" encoding="utf-8"?> <resources> <dimen name="thumbDim">100px</dimen> </resources>

String resource file in Android

admin — Tue, 24 Apr 2012 16:57:17 +0000

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Name this App</string> <string name="hello">Hello</string> </resources>

Example of color resource file in Android

admin — Tue, 24 Apr 2012 16:55:52 +0000

<?xml version="1.0" encoding="utf-8"?> <resources> <color name="background_color">#006400</color> <color name="app_text_color">#FFE4C4</color> </resources>

Start web browser with URL in android

admin — Tue, 24 Apr 2012 16:54:16 +0000

Uri address = Uri.parse("http://w3mentor.com"); Intent surf = new Intent(Intent.ACTION_VIEW, address); startActivity(surf);

Write xml file using python

admin — Tue, 24 Apr 2012 13:44:47 +0000

from xml.dom.minidom import Document doc = Document() people = doc.createElement("people") doc.appendChild(people) aperson = doc.createElement("person") people.appendChild(aperson) name = doc.createElement("name") aperson.appendChild(name) personname = doc.createTextNode("Annie") name.appendChild(personname) filename = "people.xml" f = open(filename, "w") f.write(doc.toprettyxml(indent=" ")) f.close()

Read and display data from sqlite table using python

admin — Mon, 23 Apr 2012 15:16:00 +0000

import cgi, os, sys import sqlite3 as db conn = db.connect('test.db') cursor = conn.cursor() conn.row_factory = db.Row cursor.execute("select * from person") rows = cursor.fetchall() sys.stdout.write("Content-type: text.html\r\n\r\n") sys.stdout.write("") sys.stdout.write("<html><body><p>") for row in rows: sys.stdout.write("%s %s %s" % (row[0],row[1],row[2])) sys.stdout.write("<br />") sys.stdout.write("</p></body></html>")

Create a simple httpserver in python

admin — Mon, 23 Apr 2012 15:13:55 +0000

import sys import BaseHTTPServer from SimpleHTTPServer import SimpleHTTPRequestHandler Handler = SimpleHTTPRequestHandler Server = BaseHTTPServer.HTTPServer Protocol = "HTTP/1.0" if sys.argv[1:]: port = int(sys.argv[1]) else: port = 8000 server_address = ('127.0.0.1', port) Handler.protocol_version = Protocol httpd = Server(server_address, Handler) print("Serving HTTP") httpd.serve_forever()

Website crawler in python

admin — Mon, 23 Apr 2012 15:12:55 +0000

import urllib, htmllib, formatter, re, sys url = sys.argv[1] website = urllib.urlopen("http://"+url) data = website.read() website.close() format = formatter.AbstractFormatter(formatter.NullWriter()) ptext = htmllib.HTMLParser(format) ptext.feed(data) links = [] links = ptext.anchorlist for link in links: if re.search('http', link) != None: print(link) website = urllib.urlopen(link) data = website.read() website.close() ptext = htmllib.HTMLParser(format) ptext.feed(data) morelinks = ptext.anchorlist for [...]

Get stock quote from yahoo finance in python

admin — Mon, 23 Apr 2012 15:09:50 +0000

import urllib, re, sys symbol = sys.argv[1] url = 'http://finance.google.com/finance?q=' content = urllib.urlopen(url+symbol).read() m = re.search('span id="ref.*>(.*)<', content) if m: quote = m.group(1) else: quote = 'no quote for symbol: ' + symbol print(quote)

Parse hyperlinks in webpage using python

admin — Mon, 23 Apr 2012 15:07:29 +0000

import urllib, htmllib, formatter website = urllib.urlopen("http://w3mentor.com") data = website.read() website.close() format = formatter.AbstractFormatter(formatter.NullWriter()) ptext = htmllib.HTMLParser(format) ptext.feed(data) for link in ptext.anchorlist: print(link)

Parse html using htmllib in python

admin — Mon, 23 Apr 2012 15:05:40 +0000

import htmllib, urllib, formatter, sys website = urllib.urlopen("http://w3mentor.com") data = website.read() website.close() format = formatter.AbstractFormatter(formatter.DumbWriter(sys.stdout)) ptext = htmllib.HTMLParser(format) ptext.feed(data) ptext.close()

Use nntplib to read news in python

admin — Mon, 23 Apr 2012 15:03:42 +0000

from nntplib import * s = NNTP('web.aioe.org') (resp, count, first, last, name) = s.group('comp.lang.python') (resp, subs) = s.xhdr('subject', (str(first)+'-'+str(last))) for subject in subs[-10:]: print(subject) number = input('Which article do you want to read? ') (reply, num, id, list) = s.body(str(number)) for line in list: print(line)

Read gmail email using python imap

admin — Mon, 23 Apr 2012 15:02:27 +0000

import imaplib mailserver = imaplib.IMAP4_SSL('imap.gmail.com', 993) username = 'gmailusername' password = 'gmailpassword' mailserver.login(username, password) status, count = mailserver.select('Inbox') status, data = mailserver.fetch(count[0], '(UID BODY[TEXT])') print data[0][1] mailserver.close() mailserver.logout()

Send email using gmail smtp and python

admin — Mon, 23 Apr 2012 14:59:47 +0000

import smtplib from email.MIMEMultipart import MIMEMultipart from email.MIMEText import MIMEText fromaddr = 'fromaddr@gmail.com' toaddr = 'toaddr@gmail.com' text = 'test email message sent from Python code' username = 'fromaddruser' password = 'fromaddrpassword' msg = MIMEMultipart() msg['From'] = fromaddr msg['To'] = toaddr msg['Subject'] = 'Test' msg.attach(MIMEText(text)) server = smtplib.SMTP('smtp.gmail.com:587') server.ehlo() server.starttls() server.ehlo() server.login(username, password) server.sendmail(fromaddr, toaddr, [...]

FTP connect and login using Python ftplib

admin — Mon, 23 Apr 2012 14:58:18 +0000

import ftplib connect = ftplib.FTP("www.mysite.com") connect.login("domain\user", "password") data = [] connect.dir(data.append) connect.quit() for line in data: print(line)

CRUD operations in sqlite using python

admin — Mon, 23 Apr 2012 14:53:40 +0000

import sqlite3 as db conn = db.connect('mytest.db') cursor = conn.cursor() cursor.execute("drop table if exists datecounts") cursor.execute("create table datecounts(date text, count int)") cursor.execute('insert into datecounts values("12/1/2011",35)') cursor.execute('insert into datecounts values("12/2/2011",42)') cursor.execute('insert into datecounts values("12/3/2011",38)') cursor.execute('insert into datecounts values("12/4/2011",41)') cursor.execute('insert into datecounts values("12/5/2011",40)') cursor.execute('insert into datecounts values("12/6/2011",28)') cursor.execute('insert into datecounts values("12/7/2011",45)') conn.row_factory = db.Row cursor.execute("select * [...]

Query sqlite table using python

admin — Mon, 23 Apr 2012 14:34:48 +0000

import sqlite3 as db conn = db.connect('mytest.db') conn.row_factory = db.Row cursor = conn.cursor() cursor.execute("select * from person") rows = cursor.fetchall() for row in rows: print("%s %s %s" % (row["name"], row["age"], row["address"])) conn.close()

Insert values in sqlite table using python

admin — Mon, 23 Apr 2012 14:33:14 +0000

import sqlite3 as db conn = db.connect('mytest.db') cursor = conn.cursor() cursor.execute('insert into person values("Mani","23","22,2nd cross, ka")') cursor.execute('insert into person values("Raja","22","5th cross, ka")') conn.close()

create table in sqlite using python

admin — Mon, 23 Apr 2012 14:31:37 +0000

import sqlite3 as db conn = db.connect('mytest.db') cursor = conn.cursor() cursor.execute("create table person(name text, age text, address text)") print("table created")

using shapes module in python

admin — Mon, 23 Apr 2012 14:09:43 +0000

from shapes import Shape from shapes import Rectangle s1 = Shape(2,4) print(s1) r1 = Rectangle(4,8,3,5) print(r1)

convert temperature using tempconv in python

admin — Mon, 23 Apr 2012 14:08:34 +0000

from tempconv import ctof from tempconv import ftoc temp = 95 convTemp = ftoc(temp) print("the converted temp is " + str(convTemp)) temp = 0 convTemp = ctof(temp) print("the converted temp is " + str(convTemp))

Define class with methods and invoke them in python

admin — Mon, 23 Apr 2012 14:06:16 +0000

class Person: def __init__(self, first, middle, last, age): self.first = first; self.middle = middle; self.last = last; self.age = age; def __str__(self): return self.first + ' ' + self.middle + ' ' + self.last + \ ' ' + str(self.age) def initials(self): return self.first[0] + self.middle[0] + self.last[0] def changeAge(self, val): self.age [...]

simple function example in python

admin — Mon, 23 Apr 2012 14:04:08 +0000

def convertTemp(temp, scale): if scale == "c": return (temp - 32.0) * (5.0/9.0) elif scale == "f": return temp * 9.0/5.0 + 32 temp = int(input("Enter a temperature: ")) scale = input("Enter the scale to convert to: ") converted = convertTemp(temp, scale) print("The converted temp is: " + str(converted))

For loop over string array in python

admin — Mon, 23 Apr 2012 14:02:40 +0000

for name in ["kak", "John", "Mani", "Matt"]: print(name)

While loop in python

admin — Mon, 23 Apr 2012 14:01:33 +0000

number = 1 while number < 20: print(number) number += 1

Calculate sum using range in python

admin — Mon, 23 Apr 2012 14:00:19 +0000

sum = 0 numbers = range(1,10) for i in numbers: sum += i print(sum)

if elif in python

admin — Mon, 23 Apr 2012 13:59:23 +0000

marks = 99 if marks >= 90: grade = 'A' elif marks >= 80: grade = 'B' elif marks >= 70: grade = 'C' elif marks >= 60: grade = 'D' else: grade = 'F' print(grade)

Selecting a MongoDB database in PHP

admin — Fri, 20 Apr 2012 16:54:26 +0000

After connecting to the database server, you can obtain a handle to the database using the following syntax. $db = $connection->selectDB('databasename'); A shorthand way to selecting a database is as follows: $db = $connection->databasename; If there is no database with the specified name, MongoDB will automatically create it.

Connecting to a MongoDB Database Server in PHP

admin — Fri, 20 Apr 2012 16:51:14 +0000

After installing the MongoDB database, use the following code to connect to the MongoDB database. $connection = new Mongo(); The above code connects to the database using default credentials.i.e host is localhost and port is 27017. To explicitly connect to a remote host where MongoDB is housed, use the following syntax. $connection = new Mongo( [...]

Aggregate sum of all elements in array using LINQ

admin — Fri, 20 Apr 2012 16:43:18 +0000

int[] numbers = new int[] {1,2,3,4,5,6,7,8}; int result = numbers.Sum(); Console.WriteLine(result);

Set FM Radio frequency in windows phone 7

admin — Fri, 20 Apr 2012 15:25:33 +0000

try { FMRadio myRadio = FMRadio.Instance; myRadio.PowerMode = RadioPowerMode.On; myRadio.CurrentRegion = RadioRegion.Europe; myRadio.Frequency = 91.5; if (FMRadio.Instance.SignalStrength == 0.0) { MessageBox.Show("FM radio cannot run on emulator"); } } catch (Exception ex) { MessageBox.Show("FM Radio has thrown exception" + ex.Message); } The RadioRegion enumeration only support 3 frequency bands for FM Radio tuning. 1. [...]

AccelerometerFailedException in windows phone 7

admin — Fri, 20 Apr 2012 15:17:19 +0000

Accelerometer aSensor = new Accelerometer(); // Add the accelerometer event handler to the accelerometer sensor aSensor.ReadingChanged += new EventHandler<AccelerometerReadingEventArgs>(AccelerometerReadingChanged); bool isActive = false; // Start the accelerometer try { aSensor.Start(); isActive = true; } catch (AccelerometerFailedException e) { // the accelerometer couldn’t be started. isActive = false; } catch (UnauthorizedAccessException e) { // [...]

State of accelerometer sensor in windows phone 7

admin — Fri, 20 Apr 2012 15:12:13 +0000

There are six possible values for the SensorState enumeration: Disabled Initiating NoData NoPermissions NotSupported Ready The Accelerometer.Start() method should be called only if the accelerometer is in a ready state. To get the current state, use the Accelerometer.State property.

Reading accelerometer data in windows phone 7

admin — Fri, 20 Apr 2012 15:07:21 +0000

Add a reference to the Microsoft.Devices.Sensors assembly, and declare an instance of the Accelerometer class. Call the Start() method to generate accelerometer readings. using Microsoft.Devices.Sensors; Accelerometer accelerometer = new Accelerometer(); accelerometer.Start(); accelerometer.ReadingChanged += new EventHandler<AccelerometerReadingEventArgs>(accelerometer_ReadingChanged); The event handler void accelerometer_ReadingChanged(object sender, AccelerometerReadingEventArgs e) { float X = (float)e.X; float Y = (float)e.Y; float Z [...]

Partial class and partial method in C#

admin — Sun, 18 Mar 2012 13:34:51 +0000

Partial class with partial method declaration: partial class MyPartialClass { ... partial void ValidateInput(decimal amount); } Partial class with partial method body: partial class MyPartialClass { ... partial void ValidateInput(decimal amount) { if (amount> 100) throw new ArgumentException ("Too Big"); } }

Finalizers in C#

admin — Sun, 18 Mar 2012 13:31:39 +0000

Finalizers are class methods that are executed before the garbage collector frees the memory of a referenced object no longer in use. The syntax for a finalizer is the name of the class to which the tilde sign ~ preceeds: class TestClass1 { ~ TestClass1 () {... } } The above code is converted by [...]

Audio recorder in Android

admin — Sun, 18 Mar 2012 13:19:06 +0000

// initialize the MediaRecorder MediaRecorder mediarecorder = new MediaRecorder(); mediarecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediarecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mediarecorder.setOutputFile("/sdcard/myaudiorecord.3gpp"); mediarecorder.prepare(); mediarecorder.start(); //To stop recording use below code.. //mediarecorder.stop(); //mediarecorder.reset(); //After MediaRecorder is no longer needed, release it: //mediarecorder.release();

Playing music/audio file in Android

admin — Sun, 18 Mar 2012 13:16:57 +0000

string mediaFilePath = "PATH TO YOUR MUSIC/AUDIO FILE"; File mediafile = new File(mediaFilePath); short[] audio = new short[(int) (mediafile.length()/2)]; AudioTrack audiotrack = new AudioTrack( AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, audio.length, AudioTrack.MODE_STREAM ); audiotrack.play(); audiotrack.write(audio, 0, audio.length); // To pause use code below //audiotrack.pause(); // To stop use code below //audiotrack.stop(); // release all resources audiotrack.release();

Options for text-decoration in CSS

admin — Sun, 11 Mar 2012 23:15:55 +0000

The different options for text-decoration property in CSS are none underline overline line-through blink We can use a combination of these options in our CSS as shown below: a:link, a:visited { text-decoration: underline overline; }

Remove underline from hyperlinks in page using CSS

admin — Sun, 11 Mar 2012 23:12:44 +0000

We can use the text-decoration property for the link to specify if we need an underline or not. If we set the text-decoration property to none, we can remove underlines from hyperlinks in our html page. a:link, a:visited { text-decoration: none; }

Use CSS to highlight text on a page

admin — Sun, 11 Mar 2012 23:08:19 +0000

We can use a span with a specific css class to apply the highlight color. Below, we use the “highlight” class to apply highlighting. HTML: Lorem Ipsum is simply <span class="highlight">dummy text of the printing</span> and typesetting industry. CSS Class: .highlight{ background-color: Yellow; color: #B22222; } .highlight{ background-color: Yellow; color: #B22222; } Output: Lorem Ipsum [...]

Connect to MySql and select database using PHP

admin — Sat, 10 Mar 2012 23:31:02 +0000

The following code is an example of how to connect to a mysql server and select a database to query. We should always free up resources you don’t need anymore i.e make sure that mysql_close() executes at the end. This makes your code more efficient and reduces the possibility of errors. <?php $DB_HOST = "localhost"; [...]

Advantages of Generics in C#

admin — Sat, 10 Mar 2012 23:26:02 +0000

Generics are very useful in C# for storing data and they have the following advantages: 1. Generics allow code reuse for different data types. 2. Generics provide type safety. 3. Generics reduce the number of casting and boxing needed to store value types.

Implementing Stack in C# class

admin — Sat, 10 Mar 2012 23:15:13 +0000

The example below shows how we can implement a generic stack class in c# that can hold upto 100 objects. public class Stack <T> { int itemposition; T[] data = new T[100]; public void push(T obj) { data [itemposition++] = obj; } public T Pop() { return data [--itemposition]; } }

stack collection in c#

admin — Sat, 10 Mar 2012 23:10:03 +0000

An example of stack<T> use in c#: Stack<int> stack = new Stack <int>(); stack.Push(1); stack.Push(2); int x = stack.Pop() / / x is 2 int y = stack.Pop() / / y is 1

Google Maps API to calculate location distance in PHP

admin — Sat, 10 Mar 2012 20:33:13 +0000

This example shows how to use the Google maps API to calculate distance between two places in PHP $result = file_get_contents('http://maps.googleapis.com/maps/api/directions/json?origin=Chicago,IL&destination=Raleigh,NC&sensor=false'); $result = json_decode($results); $distance = $result->routes->legs->distance['text']; echo $distance // Outputs: "xxx mi"

Read JSON from file in PHP

admin — Sat, 10 Mar 2012 20:22:30 +0000

$file = new File('/path/to/file'); $myjson = $file->read(true, 'r'); $myjsonarray = json_decode($json);

Write JSON to file in PHP

admin — Sat, 10 Mar 2012 20:21:44 +0000

$json = '{"key":"value"}'; $file = new File('/path/to/file', true); $file->write($json);

Embedded types in C#

admin — Sat, 10 Mar 2012 20:17:05 +0000

An embedded type in C# is declared within the scope of another type. public class FirstLevel { public class NestedClass {} // embedded Class public enum Color {Red, Blue, Tan} // Embedded Enum } An embedded type has the following features: 1. The embedded type can access the private members of enclosing type and all [...]

Nullable types in c#

admin — Sat, 10 Mar 2012 17:04:41 +0000

Reference types in c# can have non-existing value with a zero reference. However, For value types this is usually not possible: string s = null; // OK, reference-type int i = 0; // compile-time, value-type can not be null To represent zero in a value type, you need a special construct called Nullable Type . [...]

yield break in C#

admin — Sat, 10 Mar 2012 16:00:30 +0000

The yield break instruction specifies that the iterator block is to be abandoned prematurely, without having to add more elements. Below is an example of yield break in c#. A return statement in an iterator block is not allowed therefore you must instead use yield break. static IEnumerable <string> Foo (bool breakit) { yield return [...]

Using multiple yield statements in an iterator

admin — Sat, 10 Mar 2012 15:42:58 +0000

static void Main () { foreach (string s in getty()) Console.Write (s + " ") // There you go } static IEnumerable<string> getty() { yield return "There"; yield return "you"; yield return "go"; }

Use an iterator to return a sequence of Fibonacci numbers in C#

admin — Sat, 10 Mar 2012 15:27:10 +0000

using System; using System; class FibTest { static void Main () { foreach (int fib in Fibs (6)) Console.Write (fib + ""); } static IEnumerable <int> Fibs (int fibCount) { for (int i = 0, prevFib = 1, curFib = 1; i <fibCount; i++) { yield return prevFib; int = newFib prevFib curFib [...]

Using GetEnumerator to access characters in C# string

admin — Sat, 10 Mar 2012 15:24:27 +0000

Below is an example of using GetEnumerator method of a collection to access characters in a string and display them. var enumerator = "This is my string".GetEnumerator(); while (enumerator.MoveNext()) { var element = enumerator.Current ; Console.WriteLine (element); }

What is c# enumerator and enumerable?

admin — Sat, 10 Mar 2012 15:20:25 +0000

An enumerator is a cursor that is read only and moves forward only through a sequence of values. An enumerator is an object that: 1. Implements IEnumerator 2. Has a method called MoveNext for iterating over the sequence, and a property called Current provides for the reading of the current element of the sequence. The [...]

Structure of an enumerator in c#

admin — Sat, 10 Mar 2012 15:16:52 +0000

class enumerator // Implements IEnumerator { public IteratorVariableType Current {get {...}} public bool MoveNext () {...} } class Enumerable // implements IEnumerable { public Enumerator GetEnumerator () {...} }

Advantages of call stack during debugging

admin — Sat, 10 Mar 2012 15:06:14 +0000

The call stack can be useful in a number of situations during debugging: 1. The call stack lets us determine when a method is called too early i.e when we invoke the method before the data it requires to function is ready. 2. The call stack helps to determine when a method is called too [...]

Exception class hierarchy in Java

admin — Sat, 28 Jan 2012 20:15:52 +0000

Exception AclNotFoundException ActivationException UnknownGroupException UnknownObjectException AlreadyBoundException ApplicationException AWTException BadLocationException ClassNotFoundException CloneNotSupportedException ServerCloneException DataFormatException ExpandVetoException GeneralSecurityException CertificateException CertificateEncodingException CertificateExpiredException CertificateNotYetValidException CertificateParsingException CRLException DigestException InvalidAlgorithmParameterException InvalidKeySpecException InvalidParameterSpecException KeyException InvalidKeyException KeyManagementException KeyStoreException NoSuchAlgorithmException NoSuchProviderException SignatureException UnrecoverableKeyException IllegalAccessException InstantiationException InterruptedException IntrospectionException InvocationTargetException IOException ChangedCharSetException CharConversionException EOFException FileNotFoundException InterruptedIOException MalformedURLException ObjectStreamException InvalidClassException InvalidObjectException NotActiveException NotSerializableException OptionalDataException StreamCorruptedException WriteAbortedException ProtocolException RemoteException [...]