hotkeys.cs

wince 下的录音软件,c#编写.使用OpenNetCF组件完成录音功能.

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using Microsoft.WindowsCE.Forms;

namespace VoiceRecorder
{
	public class HotKeys
	{
		#region "Enums"

		//list of modifier keys to use 
		public enum KeyModifiers
		{
			None = 0,
			Alt = 1,
			Control = 2,
			Shift = 4,
			Windows = 8,
			Modkeyup = 0x1000
		}

		#endregion

		#region "DLL Imports"

		[DllImport("coredll.dll", EntryPoint = "RegisterHotKey", SetLastError = true)]
		private static extern bool RegisterHotKey(IntPtr hWnd, int id, KeyModifiers Modifiers, int key);

		[DllImport("coredll.dll", EntryPoint = "UnregisterHotKey", SetLastError = true)]
		private static extern bool UnRegisterHotKey(IntPtr hWnd, int key);

		#endregion

		#region "Vars"

		//message listener 
		private HotKeyMessageWindow wnd = null;

		//public keypressed event, for the outside world to listen to 
		public delegate void KeyPressedEventHandler(Keys key);
		private KeyPressedEventHandler KeyPressedEvent;

		public event KeyPressedEventHandler KeyPressed
		{
			add
			{
				KeyPressedEvent = (KeyPressedEventHandler)System.Delegate.Combine(KeyPressedEvent, value);
			}
			remove
			{
				KeyPressedEvent = (KeyPressedEventHandler)System.Delegate.Remove(KeyPressedEvent, value);
			}
		}

		#endregion

		#region "Constructors"

		public HotKeys()
		{
			wnd = new HotKeyMessageWindow(this);

		}
		#endregion

		#region "Methods"

		public void Register(System.Windows.Forms.Keys Key, KeyModifiers Modifier)
		{
			//register the key 
			RegisterHotKey(wnd.Hwnd, System.Convert.ToInt32(Key), Modifier, System.Convert.ToInt32(Key));
		}

		public void UnRegister(System.Windows.Forms.Keys Key)
		{
			//unregister any previous keys 
			UnRegisterHotKey(wnd.Hwnd, System.Convert.ToInt32(Key));
		}

		//handle the message listener's keypress 

		public void OnKeyPressed(Keys key)
		{
			//forward the keypress event to the outside world. 
			if (KeyPressedEvent != null)
				KeyPressedEvent(key);
		}
		#endregion

		#region "MessageWindow"

		//internal message listener. 
		private class HotKeyMessageWindow : MessageWindow
		{
			private const long WM_HOTKEY = 0x312;
			HotKeys parent;

			public HotKeyMessageWindow(HotKeys h)
			{
				parent = h;
			}

			protected override void WndProc(ref Message msg)
			{
				//look at the message type 
				switch ((long)msg.Msg)
				{
					case WM_HOTKEY:
						//it's a hot key, so raise the event 
						parent.OnKeyPressed((Keys)msg.WParam.ToInt32());
						break;
					default:
						//all other messages go to the base class 
						base.WndProc(ref msg);
						break;
				}
			}
		}
		#endregion
	}
}