w3mentor

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 [...]

Example of echo server in Java

admin — Sat, 28 Jan 2012 20:13:15 +0000

try { ServerSocket s = new ServerSocket(1234); // Create server while (true) { Socket c = s.accept(); // Await connection InputStream i = c.getInputStream(); // Get input stream OutputStream o = c.getOutputStream();//Get output stream do { byte[] line = new byte[100]; // Create scratchpad i.read(line); // Read client's message o.write(line); // Send it back } [...]

Example of Echo Client in Java

admin — Sat, 28 Jan 2012 20:11:27 +0000

Socket s = new Socket("192.168.1.1", 123); // Create socket InputStream i = s.getInputStream(); // Get input stream OutputStream o = s.getOutputStream(); // Get output stream String str; do { byte[] line = new byte[100]; System.in.read(line); // Read from console o.write(line); // Send the message i.read(line); // Read it back str = new String(line); // Convert [...]

Recursively calculate Fibonacci Sequence in Java

admin — Sat, 31 Dec 2011 14:01:51 +0000

public class Fibonacci { private int calculate(int length) { if (length < 0) { throw new IllegalArgumentException("Input must be greater than zero"); } if (length <= 1) { return length; } else { return calculate(length - 1) + calculate(length - 2); } } public static void main(String[] args) { Fibonacci fibonacci = new Fibonacci(); [...]

Compute factorial using for loop in Java

admin — Sat, 31 Dec 2011 14:00:20 +0000

public class Factorial { int calculate(int number) { if (number < 0) { throw new IllegalArgumentException("integer must be greater than zero"); } if( number == 0 || number == 1) return 1; else { int total = 1; for (int i = 1; i < number + 1; i++) { total *= i; } [...]

Calculate factorial using recursion in Java

admin — Sat, 31 Dec 2011 13:58:03 +0000

package com.w3mentor.examples.factorial; public class Factorial { int calculate(int number) { if (number < 0) { throw new IllegalArgumentException("integer must be greater than zero"); } if( number == 0) { return 1; } else { return number * calculate (number - 1); } } public static void main(String[] args) { Factorial factorial = [...]

Query processes using LINQ to find windows services

admin — Mon, 15 Aug 2011 17:34:33 +0000

IEnumerable<Process> pList = from proc in Process.GetProcesses() where String.Equals(proc.ProcessName, "svchost") select proc;

Simple LINQ to Objects example

admin — Mon, 15 Aug 2011 17:30:13 +0000

List<Employee> employees = new List<Employee>() { new Employee { ID=1, Name="Ravi", JoinDate=new DateTime(2002, 1, 15) }, new Employee { ID=2, Name="Raja", JoinDate=new DateTime(2002, 3, 17 }, new Employee { ID=3, Name="Mani", JoinDate=new DateTime(2007, 2, 11) } }; IEnumerable<Employee> query = from e in employees where e.JoinDate.Year < 2003 orderby e.Name select e; foreach [...]

Query public types in an assembly using LINQ

admin — Mon, 15 Aug 2011 17:28:10 +0000

IEnumerable<string> publicTypes = from t in Assembly.GetExecutingAssembly().GetTypes() where t.IsPublic select t.FullName; foreach (string name in publicTypes) { Console.WriteLine(name); }

Type Validation Functions in PHP

admin — Tue, 07 Jun 2011 15:45:40 +0000

is_array() – Test for Arrays is_bool() – Test for Booleans (TRUE, FALSE) is_float() – Test for Floating-point numbers is_int() – Test for Integers is_null() – Test for NULLs is_numeric() – Test forNumeric values, even as a string (e.g., ‘ 20′ ) is_resource() – Test for Resources, like a database connection is_scalar() – Test for Scalar [...]

Get phone number in android using Java

admin — Sat, 04 Jun 2011 15:31:43 +0000

private String getMyPhoneNumber(){ TelephonyManager mTelephonyMgr; mTelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); return mTelephonyMgr.getLine1Number(); } private String getMy10DigitPhoneNumber(){ String s = getMyPhoneNumber(); return s.substring(2); }

Check network connection availability on android using Java

admin — Sat, 04 Jun 2011 15:16:34 +0000

public boolean checkTheNetworkAvailability() { Context mycontext = getApplicationContext(); ConnectivityManager myconnectivity = (ConnectivityManager) mycontext.getSystemService(Context.CONNECTIVITY_SERVICE); if (myconnectivity == null) { return false; // failed null!.. } else { NetworkInfo[] myinfo = myconnectivity.getAllNetworkInfo(); if (myinfo != null) { for (int i = 0; i < myinfo.length; i++) { if (myinfo[i].getState() == NetworkInfo.State.CONNECTED) { return true; } } } [...]

Hide the status bar on android

admin — Sat, 04 Jun 2011 15:14:11 +0000

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

Hide title bar on android

admin — Sat, 04 Jun 2011 15:13:25 +0000

requestWindowFeature(Window.FEATURE_NO_TITLE); requestWindowFeature(Window.FEATURE_PROGRESS);

Android enable disable wifi on phone

admin — Sat, 04 Jun 2011 15:12:03 +0000

WifiManager mywifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); mywifi.setWifiEnabled(enabled);

Hide a file in C#

admin — Wed, 01 Jun 2011 16:42:04 +0000

File.SetAttributes(filePath, File.GetAttributes(filePath) | FileAttributes.Hidden);

Check if a file is system file in C#

admin — Wed, 01 Jun 2011 16:41:37 +0000

bool isSystem = ((File.GetAttributes(filePath) & FileAttributes.System) == FileAttributes.System);

Check if a file has archive attribute in C#

admin — Wed, 01 Jun 2011 16:41:10 +0000

bool isArchive = ((File.GetAttributes(filePath) & FileAttributes.Archive) == FileAttributes.Archive);

Check whether a file is hidden in C#

admin — Wed, 01 Jun 2011 16:40:37 +0000

bool isHidden = ((File.GetAttributes(filePath) & FileAttributes.Hidden) == FileAttributes.Hidden);

Check if a file is read only in C#

admin — Wed, 01 Jun 2011 16:39:59 +0000

bool isReadOnly = ((File.GetAttributes(filePath) & FileAttributes.ReadOnly) == FileAttributes.ReadOnly);

Display the call stack method names in C#

admin — Wed, 01 Jun 2011 16:38:58 +0000

using System.Diagnostics; [STAThread] public static void Main() { //obtain call stack StackTrace stackTrace = new StackTrace(); // obtain method calls (frames) StackFrame[] stackFrames = stackTrace.GetFrames(); // display method names foreach (StackFrame stackFrame in stackFrames) { Console.WriteLine(stackFrame.GetMethod().Name); // output method name } }

Get Name of the calling method using Reflection in C#

admin — Wed, 01 Jun 2011 16:37:36 +0000

using System.Diagnostics; // get call stack StackTrace stackTrace = new StackTrace(); // get calling method name Console.WriteLine(stackTrace.GetFrame(1).GetMethod().Name);

C# Enqueue and Dequeue queue operations

admin — Tue, 24 May 2011 20:50:34 +0000

Queue<string> myQueue = new Queue<string>(); void AddQueueItem(string request) { myQueue.Enqueue(request) ; } string GetNextQueueItem() { return myQueue.Dequeue() ; }

Stack push and pop in C#

admin — Tue, 24 May 2011 20:48:59 +0000

Stack<string> myStack = new Stack<string>() ; void addRecord(string move) { myStack.Push(move); } string GetLastRecord() { return myStack.Pop(); }

Arraylist properties and methods in C#

admin — Tue, 24 May 2011 20:16:26 +0000

ArrayList alphaList = new ArrayList(); alphaList.Add("A"); alphaList.Add("D"); alphaList.Add("W"); Console.WriteLine("Original Capacity"); Console.WriteLine(alphaList.Capacity); Console.WriteLine("Original Values"); foreach (object alpha in alphaList) { Console.WriteLine(alpha); } alphaList.Insert(alphaList.IndexOf("D") , "C"); alphaList.Insert(alphaList.IndexOf("W") , "J"); Console.WriteLine("New Capacity"); Console.WriteLine(alphaList. Capacity); Console.WriteLine("New Values"); foreach (object alpha in alphaList) { Console.WriteLine(alpha); }

Declare and fill a two-dimensional array in C#

admin — Tue, 24 May 2011 20:13:17 +0000

int[, ] my2DArray = { { 1, 1 }, { 3, 5 }, { 5, 7 } }; for (int i = 0; i <= my2DArray. GetUpperBound(0) ; i++) { for (int x = 0; x <= my2DArray.GetUpperBound(1); x++) { Console.WriteLine("Index = [{0},{1}] Value = {2}", i, x, my2DArray[i, x] ); } }

Foreach loop to iterate through the elements of the array in C#

admin — Tue, 24 May 2011 20:10:59 +0000

int[] intArray = { 1, 2, 3, 4, 5 }; Console.WriteLine("Upper Bound"); Console.WriteLine(intArray. GetUpperBound(0) ); Console.WriteLine("Array elements") ; foreach (int item in intArray) { Console.WriteLine(item) ; } Array.Reverse(intArray) ; Console.WriteLine("Array reversed") ; foreach (int item in intArray) { Console.WriteLine(item) ; } Array.Clear(intArray, 2, 2) ; Console.WriteLine("Elements 2 and 3 cleared") ; foreach (int item in [...]

Test if number is even or odd in C

admin — Mon, 09 May 2011 23:37:18 +0000

#include <iostream> using namespace std; int main() { int n, remainder; cout << "Enter a number and press ENTER: "; cin >> n; remainder = n % 2; if (remainder == 0) cout << "The number is even." << endl; else cout << "The number is odd." << endl; system("PAUSE"); return 0; [...]

Calculate square of a number in C

admin — Mon, 09 May 2011 23:35:17 +0000

#include <iostream> using namespace std; int main() { double n; cout << "Input a number and press ENTER: "; cin >> n; cout << "The square is: " << n * n << endl; system("PAUSE"); return 0; }

Convert celsius to farenheit in C++

admin — Mon, 09 May 2011 23:26:08 +0000

#include <iostream> using namespace std; int main() { double ctemp; // Celsius temperature double ftemp; // Fahrenheit temperature cout << "Input a Celsius temp and press ENTER: "; cin >> ctemp; ftemp = (ctemp * 1.8) + 32; cout << "Fahrenheit temp is: " << ftemp << endl; return 0; }

Printing multiple lines in C++

admin — Mon, 09 May 2011 23:24:12 +0000

#include <iostream> using namespace std; int main() { cout << "welcome," << endl; cout << "to the website." << endl; cout << "w3mentor.com!" << endl; system("PAUSE"); return 0; }

Urlencoding in PHP using urlencode

admin — Mon, 02 May 2011 16:40:51 +0000

<?php $myurlparam = "hello this is a test message"; $site = "http://www.w3mentor.com"; $query = $site; $query .= "&message=".urlencode( $myurlparam ); echo $query; ?>

Compare two arrays to see if value from form post exists in PHP

admin — Mon, 02 May 2011 16:35:25 +0000

<?php $choices = array('my choice 1', 'my choice 2', 'my choice 3'); $valid = true; if (is_array($_GET['inputArray'])) { $valid = true; foreach($_GET['inputArray'] as $input) { if (!in_array($input, $choices)) { $valid = false; } } if ($valid) { echo "Input Value were found in choices"; } } ?>

Using Radio buttons in PHP Form

admin — Mon, 02 May 2011 16:30:16 +0000

<html> <body> <form action="mychoice.php" method="post"> <b>Enter Name:</b> <input type="text" size="45" name="username"> <br> <b>Please select your favorite animal:</b> <br> <input type="radio" name="animal" value="dog">Dog <input type="radio" name="animal" value="cat">Cat <input type="radio" name="animal" value="fish">Fish <br> <input type="submit" value="Submit"> </form> </body> </html> File: mychoice.php <html> <head> <title>Form submission</title> </head> <body> <br> <?php $username = $_POST['username']; $animal = [...]

Radio button validation in PHP using array_key_exists

admin — Mon, 02 May 2011 16:26:22 +0000

<?php $animals = array('dog' => 'D', 'cat' => 'C', 'bird' => 'B'); foreach ($animals as $key => $animal) { echo "<input type='radio' name='animal' value='$key'/> $animal \n"; } if (!array_key_exists($_POST['animal'], $animals)) { echo "You must select a valid animal."; } ?>

Positioning elements on a Silverlight Canvas

admin — Tue, 26 Apr 2011 23:48:12 +0000

The Canvas.Top and Canvas.Left attributes can be set within the children control’s XAML to position within the Canvas relatively. <UserControl x:Class='TestSilverlightApplication.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <StackPanel Orientation="Vertical" Background="Blue"> <Canvas x:Name="MyCanvas" HorizontalAlignment="Left" VerticalAlignment="Top" Height="200" Width="400" Background="White" Margin="10"> <TextBlock Canvas.Top="10" Canvas.Left="15" FontSize="40" Foreground="Red" Text="Sample Canvas Text" /> <Rectangle Canvas.Top="40" Canvas.Left="50" Height="60" Width="100" Fill="Green" Canvas.ZIndex="-1" [...]

Set padding in silverlight code behind

admin — Tue, 26 Apr 2011 23:39:02 +0000

Xaml: <UserControl x:Class='TestSilverlightApplication.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <Canvas Name="canvas1"> </Canvas> </UserControl> Code behind: namespace TestSilverlightApplication { public partial class MainPage : UserControl { Button mybutton = null; public MainPage() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { mybutton = new Button { Content = "Hi and Welcome", [...]

Change canvas background in Silverlight .Net

admin — Tue, 26 Apr 2011 23:36:05 +0000

Merge Datasets using C#

sbm — Thu, 21 Apr 2011 01:48:52 +0000

We can merge a dataset to another dataset using Merge. Lets assume we have two datasets ds1 and ds2. DataSet ds1 = new DataSet(); da1.Fill(ds, "temp");

perl abs Function

madhu — Thu, 21 Apr 2011 01:48:49 +0000

PERL abs FunctionPERL abs Function Syntax abs VALUE abs PERL abs Function Definition and Usage Returns the absolute value of its argument. If pure interger value is passed then it will return it as it is but if a string is passed then it will return zero. If VALUE is omitted then it uses $_ [...]

printf function in PERL

madhu — Thu, 21 Apr 2011 01:48:47 +0000

PERL printf FunctionPERL printf Function Syntax printf FILEHANDLE FORMAT, LIST printf FORMAT, LIST PERL printf Function Definition and Usage Prints the value of LIST interpreted via the format specified by FORMAT to the current output filehandle, or to the one specified by FILEHANDLE. Effectively equivalent to print FILEHANDLE sprintf(FORMAT, LIST) You can use print in [...]

Strip out all html tags in string using C#

admin — Mon, 11 Apr 2011 00:15:00 +0000

The tags need not be correctly nested for the below implementation to work.. public static string RemoveHtmlTags(string pInput) { char[] array = new char[pInput.Length]; int arrayIndex = 0; bool inside = false; for (int i = 0; i < pInput.Length; i++) { char let = pInput[i]; if (let == '<') { inside = true; continue; [...]

Check if remote files exist using C#

admin — Mon, 11 Apr 2011 00:10:52 +0000

public void CheckFile() { // The two different files as strings. string urlfile1 = "http://remotehost.com/file1.zip"; string urlfile2 = "http://remotehost.com/file2.zip"; try { // Check to see if urlfile1 exists HttpWebRequest myrequest = (HttpWebRequest)WebRequest.Create(urlfile1); myrequest.Credentials = System.Net.CredentialCache.DefaultCredentials; HttpWebResponse response = (HttpWebResponse)myrequest.GetResponse(); Console.WriteLine(urlfile1 + "Found"); } catch (Exception ex) { // Check to see if urlfile2 exists [...]