OnTopReplica/OnTopReplica/WindowHandle.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using OnTopReplica.Native;

namespace OnTopReplica {

	/// <summary>Helper class that keeps a window handle (HWND), the title of the window and can load its icon.</summary>
	public class WindowHandle : System.Windows.Forms.IWin32Window {
		IntPtr _handle;
		string _title;

		public WindowHandle(IntPtr p, string title) {
			_handle = p;
			_title = title;
		}

		public string Title {
			get {
				return _title;
			}
		}

		Icon _icon = null;
		bool _iconFetched = false;
		public Icon Icon {
			get {
				if (!_iconFetched) {
					//Fetch icon from window
					IntPtr hIcon;

                    if (MessagingMethods.SendMessageTimeout(_handle, WM.GETICON, new IntPtr(2), new IntPtr(0),
                        MessagingMethods.SendMessageTimeoutFlags.AbortIfHung | MessagingMethods.SendMessageTimeoutFlags.Block, 500, out hIcon) == IntPtr.Zero)
						hIcon = IntPtr.Zero;

					if (hIcon.ToInt64() != 0) {
						_icon = Icon.FromHandle(hIcon);
					}
					else {
						//Fetch icon from window class
                        hIcon = (IntPtr)WindowMethods.GetClassLong(_handle, WindowMethods.ClassLong.IconSmall);

						if (hIcon.ToInt64() != 0) {
							_icon = Icon.FromHandle(hIcon);
						}
					}
				}

				_iconFetched = true;

				return _icon;
			}
		}

		public override string ToString() {
			return _title;
		}

		public override bool Equals(object obj) {
			if (ReferenceEquals(obj, this))
				return true;

			System.Windows.Forms.IWin32Window win = obj as System.Windows.Forms.IWin32Window;

			if (win == null)
				return false;

			return (win.Handle == _handle);
		}

		public override int GetHashCode() {
			return _handle.GetHashCode();
		}

		#region IWin32Window Members

		public IntPtr Handle {
			get { return _handle; }
		}

		#endregion

	}
}