DZone Snippets: Mstampar's Code Snippets

Compress/decompress byte array

mstampar (Miroslav Stampar) — Sun, 10 Jun 2007 22:03:12 GMT



 using System;

 using System.Collections.Generic;

 using System.IO.Compression;

 using System.IO;

 using System.Collections;



namespace Utilities

{

 class Compression

 {

        public static byte[] Compress(byte[] data)

        {

            MemoryStream ms = new MemoryStream();

            DeflateStream ds = new DeflateStream(ms, CompressionMode.Compress);

            ds.Write(data, 0, data.Length);

            ds.Flush();

            ds.Close();

            return ms.ToArray();

        }

        public static byte[] Decompress(byte[] data)

        {

            const int BUFFER_SIZE = 256;

            byte[] tempArray = new byte[BUFFER_SIZE];

            List tempList = new List();

            int count = 0, length = 0;



            MemoryStream ms = new MemoryStream(data);

            DeflateStream ds = new DeflateStream(ms, CompressionMode.Decompress);



            while ((count = ds.Read(tempArray, 0, BUFFER_SIZE)) > 0)

            {

                if (count == BUFFER_SIZE)

                {

                    tempList.Add(tempArray);

                    tempArray = new byte[BUFFER_SIZE];

                }

                else

                {

                    byte[] temp = new byte[count];

                    Array.Copy(tempArray, 0, temp, 0, count);

                    tempList.Add(temp);

                }

                length += count;

            }



            byte[] retVal = new byte[length];



            count = 0;

            foreach (byte[] temp in tempList)

            {

                Array.Copy(temp, 0, retVal, count, temp.Length);

                count += temp.Length;

            }



            return retVal;

        }

 }

}

Sort generic list

mstampar (Miroslav Stampar) — Thu, 07 Jun 2007 19:06:38 GMT



public class Item

{

 public Item(string term, int freq)

 {

  _term = term;

  _freq = freq;

 }



 private string _term;

 public string Term

 {

  get { return _term; }

  set { _term = value; }

 }



  private int _freq;

  public int Freq

  {

   get { return _freq; }

   set { _freq = value; }

  }

 }



 public class ItemComparer:IComparer

 {

  #region IComparer Members



  public int Compare(Item x, Item y)

  {

   return y.Freq - x.Freq; //descending sort

   //return x.Freq - y.Freq; //ascending sort

  }



  #endregion

 }



static void Main()

{

 List items = new List();

 ....

 items.Sort(new ItemComparer());

}

OnApplicationIdle event

mstampar (Miroslav Stampar) — Mon, 04 Jun 2007 11:39:48 GMT



using System;

using System.Threading;

using System.Reflection;

using System.Windows.Forms;

   



public class HelloWorldForm : Form

{

    public HelloWorldForm()

    {

        Text = "Hello, WindowsForms!";

    }

}

   

public class ApplicationEventHandlerClass

{

    public void OnIdle(object sender, EventArgs e)

    {

        Console.WriteLine("The application is idle.");

    }

}

   

public class MainClass

{

    public static void Main()

    {

        HelloWorldForm FormObject = new HelloWorldForm();

        ApplicationEventHandlerClass AppEvents = new ApplicationEventHandlerClass();

   

        Application.Idle += new EventHandler(AppEvents.OnIdle);

        Application.Run(FormObject);

    }

}

OnApplicationExit event

mstampar (Miroslav Stampar) — Mon, 04 Jun 2007 11:38:51 GMT



using System;

using System.Threading;

using System.Reflection;

using System.Windows.Forms;

   



public class HelloWorldForm : Form

{

    public HelloWorldForm()

    {

        Text = "Hello, WindowsForms!";

    }

}

   

public class ApplicationEventHandlerClass

{

    public void OnApplicationExit(object sender, EventArgs e)

    {

        try

        {

            Console.WriteLine("The application is shutting down.");

        }

        catch(NotSupportedException)

        {

        }

    }

}

   

public class MainClass

{

    public static void Main()

    {

        HelloWorldForm FormObject = new HelloWorldForm();

        ApplicationEventHandlerClass AppEvents = new ApplicationEventHandlerClass();

   

        Application.ApplicationExit += new EventHandler(AppEvents.OnApplicationExit);

        Application.Run(FormObject);

    }

}

Reduce memory footprint of a .NET application

mstampar (Miroslav Stampar) — Sat, 02 Jun 2007 10:39:09 GMT

Don’t ask me anything. It just works :)



 try

{

Process process = Process.GetCurrentProcess();

process.MaxWorkingSet = loProcess.MaxWorkingSet;

process.Dispose();

}

catch { }

p.s. you can even make a timer that could run this piece of code periodically.

Get list of running processes

mstampar (Miroslav Stampar) — Tue, 29 May 2007 23:24:33 GMT



 Console.WriteLine("ID:\tProcess name:");

 Console.WriteLine("--\t------------");

 foreach (System.Diagnostics.Process process in System.Diagnostics.Process.GetProcesses())

  Console.WriteLine("{0}\t{1}", process.Id, process.ProcessName);

Automatically send keys to other application

mstampar (Miroslav Stampar) — Tue, 29 May 2007 12:40:46 GMT



using System;

using System.Collections.Generic;

using System.Text;

using System.Windows.Forms;

using System.Diagnostics;



namespace ConsoleApplicationTest

{

    class Program

    {

        [System.Runtime.InteropServices.DllImport("USER32.DLL", CharSet = System.Runtime.InteropServices.CharSet.Auto)]

        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [System.Runtime.InteropServices.DllImport("USER32.DLL", CharSet = System.Runtime.InteropServices.CharSet.Auto)]

        static extern bool SetForegroundWindow(IntPtr hWnd);



        static void Main(string[] args)

        {

            Process calc = Process.Start("calc.exe");

            calc.WaitForInputIdle();



            IntPtr calculatorHandle = FindWindow(null, "Calculator");

            if (calculatorHandle == IntPtr.Zero)

            {

                Console.WriteLine("Calculator is not running.");

            }

            else

            {

                SetForegroundWindow(calculatorHandle);

                SendKeys.SendWait("13");

                SendKeys.SendWait("*");

                SendKeys.SendWait("13");

                SendKeys.SendWait("=");

            }

        }

    }

}

HTML Encoding/Decoding

mstampar (Miroslav Stampar) — Mon, 28 May 2007 22:53:17 GMT



 string temp = System.Web.HttpUtility.HtmlEncode("this is a test");

 temp2 = System.Web.HttpUtility.HtmlDecode(temp2);

p.s. first add reference to "System.Web"

DateTime to double and vice versa

mstampar (Miroslav Stampar) — Mon, 28 May 2007 15:06:12 GMT



 public static double ToDouble(DateTime what)

 {

  return BitConverter.ToDouble(BitConverter.GetBytes(what.Ticks), 0);

 }



 public static DateTime ToDateTime(double what)

 {

  return new DateTime(BitConverter.ToInt64(BitConverter.GetBytes(what), 0));

 }

Beep

mstampar (Miroslav Stampar) — Sun, 27 May 2007 22:07:58 GMT



        [DllImport("kernel32.dll")]

        public static extern bool Beep(int freq, int duration);



        static void Main(string[] args)

        {

            Beep(1000, 50);

        }