To CNET: Example of a global hotkey, I wonder if there is any use

Class Hotkey.cs
Using System;
Namespace Durius.generics
{
public delegate void Hotkeyeventhandler (int hotkeyid);
<summary>
System Wide Hotkey Wrapper.
///
Robert Jeppesen
Send Bugs to Robert@durius.com
</summary>
public class Hotkey:System.Windows.Forms.IMessageFilter
{
System.Collections.Hashtable keyids = new System.Collections.Hashtable ();
IntPtr hWnd;
<summary>
Occurs when a hotkey has been pressed.
</summary>
public event Hotkeyeventhandler Onhotkey;
public enum Keyflags
{
Mod_alt = 0x1,
Mod_control = 0x2,
Mod_shift = 0x4,
Mod_win = 0x8
}
[System.Runtime.InteropServices.DllImport ("User32.dll")]
public static extern UInt32 RegisterHotKey (IntPtr hWnd, UInt32 ID,
UInt32 fsmodifiers, UInt32 VK);
[System.Runtime.InteropServices.DllImport ("User32.dll")]
public static extern UInt32 Unregisterhotkey (IntPtr hWnd, UInt32 ID);
[System.Runtime.InteropServices.DllImport ("kernel32.dll")]
public static extern UInt32 Globaladdatom (String lpstring);
[System.Runtime.InteropServices.DllImport ("kernel32.dll")]
public static extern UInt32 Globaldeleteatom (UInt32 natom);
<summary>
constructor. Adds this instance to the "Messagefilters so" this class can raise Hotkey events
</summary>
<param name= "hwnd" >a valid hwnd, i.e. Form1. Handle</param>
Public Hotkey (IntPtr hWnd)
{
This.hwnd = hWnd;
System.Windows.Forms.Application.AddMessageFilter (this);
}
<summary>
Register a system wide hotkey.
</summary>
<param name= "HWnd" >form1. Handle</param>
<param name= "Key" >your hotkey</param>
<returns>id integer for your hotkey. Use the to know which hotkey is pressed.</returns>
public int RegisterHotKey (System.Windows.Forms.Keys Key, Keyflags keyflags)
{
UInt32 Hotkeyid = Globaladdatom (System.Guid.NewGuid (). ToString ());
RegisterHotKey ((INTPTR) hWnd, Hotkeyid, (UInt32) Keyflags, (UInt32) Key);
Keyids.add (Hotkeyid, Hotkeyid);
return (int) Hotkeyid;
}
<summary>
Unregister hotkeys and delete atoms.
</summary>
public void Unregisterhotkeys ()
{
System.Windows.Forms.Application.RemoveMessageFilter (this);
foreach (UInt32 key in Keyids.values)
{
Unregisterhotkey (HWnd, key);
Globaldeleteatom (key);
}
}
public bool Prefiltermessage (ref System.Windows.Forms.Message m)
{
if (m.msg = = 0x312)/*wm_hotkey*/
{
if (Onhotkey!= null)
{
foreach (UInt32 key in Keyids.values)
{
if ((UInt32) M.wparam = = key)
{
Onhotkey ((int) m.wparam);
return true;
}
}
}
}
return false;
}
}
}

Test program Form1.cs
Using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;
Using Durius.generics;
Namespace Testgenerics
{
<summary>
Summary description for Form1.
</summary>
public class Form1:System.Windows.Forms.Form
{
Hotkey Hotkey;
int Hotkey1;
int Hotkey2;
Private System.Windows.Forms.Label Label1;
Private System.Windows.Forms.Label Label2;
Private System.Windows.Forms.Label label3;
Private System.Windows.Forms.Button button1;
<summary>
Required designer variable.
</summary>
Private System.ComponentModel.Container components = null;
Public Form1 ()
{
//
Required for Windows Form Designer support
//
InitializeComponent ();
/*
* Initialize our hotkeys. Pass in a handle to the main form in the constructor,
* Then call RegisterHotKey for each of my hotkey combinations and wire up
* The Event
*/
Hotkey = new Hotkey (this. Handle);
Hotkey1 = Hotkey. RegisterHotKey (System.Windows.Forms.Keys.D1, Hotkey.KeyFlags.MOD_WIN);
Hotkey2 = Hotkey. RegisterHotKey (System.Windows.Forms.Keys.D2, Hotkey.KeyFlags.MOD_CONTROL);
Hotkey. Onhotkey + = new Hotkeyeventhandler (Onhotkey);
}
<summary>
The Hotkey event handler. If you are have several hotkeys, you'll have to check
Which one was pressed using Hotkeyid.
RegisterHotKey returns the Hotkeyid that is assigned to your hotkey.
</summary>
<param name= "Hotkeyid" ></param>
public void Onhotkey (int hotkeyid)
{
This. Activate ();
if (Hotkeyid = = Hotkey1)
{
MessageBox.Show ("win+1 pressed.");
}
else if (Hotkeyid = = Hotkey2)
{
MessageBox.Show ("ctrl+2 pressed.");
}
}
<summary>
Clean up any being used.
</summary>
protected override void Dispose (bool disposing)
{
if (disposing)
{
Hotkey. Unregisterhotkeys ();
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}
#region Windows Form Designer generated code
<summary>
Required to Designer support-do not modify
The contents is with the Code Editor.
</summary>
private void InitializeComponent ()
{
This.label1 = new System.Windows.Forms.Label ();
This.label2 = new System.Windows.Forms.Label ();
This.label3 = new System.Windows.Forms.Label ();
This.button1 = new System.Windows.Forms.Button ();
This. SuspendLayout ();
//
Label1
//
This.label1.Location = new System.Drawing.Point (16, 8);
This.label1.Name = "Label1";
This.label1.Size = new System.Drawing.Size (200, 16);
This.label1.TabIndex = 0;
This.label1.Text = "hotkeys:";
//
Label2
//
This.label2.Location = new System.Drawing.Point (16, 32);
This.label2.Name = "Label2";
This.label2.Size = new System.Drawing.Size (208, 16);
This.label2.TabIndex = 1;
This.label2.Text = "Win + 1";
//
Label3
//
This.label3.Location = new System.Drawing.Point (16, 56);
This.label3.Name = "Label3";
This.label3.Size = new System.Drawing.Size (208, 16);
This.label3.TabIndex = 2;
This.label3.Text = "Ctrl + 2";
//
Button1
//
This.button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
This.button1.Location = new System.Drawing.Point (88, 80);
This.button1.Name = "Button1";
This.button1.TabIndex = 3;
This.button1.Text = "about";
This.button1.Click + = new System.EventHandler (This.button1_click);
//
Form1
//
This. AutoScaleBaseSize = new System.Drawing.Size (5, 13);
This. ClientSize = new System.Drawing.Size (168, 123);
This. Controls.AddRange (new system.windows.forms.control[] {
This.button1,
THIS.LABEL3,
This.label2,
This.label1});
This. Name = "Form1";
This. Text = "Hotkey";
This. ResumeLayout (FALSE);
}
#endregion
<summary>
The main entry point is for the application.
</summary>
[STAThread]
static void Main ()
{
Application.Run (New Form1 ());
}
private void Button1_Click (object sender, System.EventArgs e)
{
MessageBox.Show (This, @ "System wide Hotkey Wrapper
-Robert Jeppesen
Http://www.durius.com "," Hotkey sample ");
}
}
}