riyadparvez’s gists

riyadparvez / StreamTokenizer.cs

Last active February 6, 2024 07:40

C# port of java's StreamTokenizer class. Everything kept same except some renaming for following C# naming convention. And it also implements IEnumerable for foreach support

	/**
	* The <code>StreamTokenizer</code> class takes an input stream and
	* parses it into "tokens", allowing the tokens to be
	* Read one at a time. The parsing process is controlled by a table
	* and a number of flags that can be set to various states. The
	* stream tokenizer can recognize identifiers, numbers, quoted
	* strings, and various comment styles.
	* <p>
	* Each byte Read from the input stream is regarded as a character
	* in the range <code>'\u0000'</code> through <code>'\u00FF'</code>.

riyadparvez / FocusablePanel.cs

Last active December 10, 2015 10:08

This panel class gets focus. On the other hand default panel control tries to get away from focus. This code is taken from Hans Passant from stackoverlfow

	//This panel will get focus as the original .NET panel always tries to get away from focus
	public class FocusablePanel : Panel
	{
	public FocusablePanel()
	{
	this.SetStyle(ControlStyles.Selectable, true);
	this.TabStop = true;
	}

riyadparvez / Winform Flickering.cs

Created December 31, 2012 12:58

Add this code snippet into your form or control class to stop flickering in winform

	protected override CreateParams CreateParams
	{
	get
	{
	CreateParams cp = base.CreateParams;
	cp.ExStyle \|= 0x02000000;
	return cp;
	}
	}

riyadparvez / UnscrollableComboBox.cs

Created December 31, 2012 12:59

ComboBox class which doesn't catch mouse wheel event rather it passes to other controls

	//Combobox will handle mouse wheel event, but if you want to combobox which won't handle mouse wheel
	//event, rather pass to the parent, use this class
	public class UnscrollableComboBox : ComboBox
	{
	protected override void WndProc(ref Message m)
	{
	if (m.Msg == 0x20a && this.Parent != null)
	{
	PostMessage(this.Parent.Handle, m.Msg, m.WParam, m.LParam);
	}

riyadparvez / Navigation Key Handler.cs

Created December 31, 2012 13:01

Add this code snippet to your class to handle navigational key press

	protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
	{
	if (keyData == Keys.Up)
	{

	}
	else if (keyData == Keys.Down)
	{

	}

riyadparvez / Connected Component Labeling.cs

Created January 2, 2013 12:03

Implementation of ConnectedComponentLabeling algorithm. It uses rooted tree data structure for members of a label. It's of O(n^2). I've used this algorithm for line detection in images (which are already converted to binary images using threshold, eliminating noise)

	using System.Collections.Generic;
	using System.Drawing;

	namespace PatternRecognition
	{
	public class ConnectedComponentLabeling
	{
	readonly int[,] board;
	readonly int w;
	readonly int h;

riyadparvez / NonNullable.cs

Created January 6, 2013 09:09

Non-nullable reference types. It's from Jon Skeet

	public struct NonNullable<T> where T : class
	{
	private readonly T value;

	public NonNullable(T value)
	{
	if (value == null)
	{
	throw new ArgumentNullException("value");
	}

riyadparvez / CsvUtils.cs

Created January 6, 2013 14:48

DataTable to CSV extension methods. Export to CSV file, CSV string

	public static class CSV
	{
	public static string ToCSV(this DataTable table)
	{
	var columnHeaders = (from DataColumn x in table.Columns
	select x.ColumnName).ToArray();
	StringBuilder builder = new StringBuilder(String.Join(",", columnHeaders));
	builder.Append("\n");

	foreach (DataRow row in table.Rows)

riyadparvez / ReflectionUtilities.cs

Created January 6, 2013 14:50

Reflection utilities for C#. Get all fields, constructors, methods and properties

	/// <summary>
	/// Utilties for reflection
	/// </summary>
	public static class ReflectionUtils
	{
	/// <summary>
	/// Get all the fields of a class
	/// </summary>
	/// <param name="type">Type object of that class</param>
	/// <returns></returns>

riyadparvez / EnumDescription.cs

Created January 6, 2013 14:57

An attribute class for providing description for enum types in C# and util methods to retrieve description written for enum types(if that attribute is used0.)

	/// <summary>
	/// Provides a description for an enumerated type.
	/// </summary>
	[AttributeUsage(AttributeTargets.Enum \| AttributeTargets.Field,
	AllowMultiple = false)]
	public sealed class EnumDescriptionAttribute : Attribute
	{
	private string description;

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