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.Summary

[DllImport("user32.dll", SetLastError = true)]

[return: MarshalAs(UnmanagedType.Bool)]

static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

Public Declare Function RegisterHotKey Lib "user32" Alias "RegisterHotKey" (ByVal hwnd As Long, ByVal id As Long, ByVal fsModifiers As Long, ByVal vk As Long) As Boolean

Declare Auto Function RegisterHotKey Lib "user32.dll" (Byval handle As IntPtr, ByVal id As Integer, ByVal fsModifier As UInt32, ByVal vk As UInt32) As Boolean

None.

None.

Please add some!

public class WindowsShell

{

#region fields

public static int MOD_ALT = 0x1;

public static int MOD_CONTROL = 0x2;

public static int MOD_SHIFT = 0x4;

public static int MOD_WIN = 0x8;

public static int WM_HOTKEY = 0x312;

#endregion

[DllImport("user32.dll")]

private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);

[DllImport("user32.dll")]

private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

private static int keyId;

public static void RegisterHotKey(Form f, Keys key)

{

int modifiers = 0;

if ((key & Keys.Alt) == Keys.Alt)

modifiers = modifiers | WindowsShell.MOD_ALT;

if ((key & Keys.Control) == Keys.Control)

modifiers = modifiers | WindowsShell.MOD_CONTROL;

if ((key & Keys.Shift) == Keys.Shift)

modifiers = modifiers | WindowsShell.MOD_SHIFT;

Keys k = key & ~Keys.Control & ~Keys.Shift & ~Keys.Alt;

keyId = f.GetHashCode(); // this should be a key unique ID, modify this if you want more than one hotkey

RegisterHotKey((IntPtr)f.Handle, keyId, (uint)modifiers, (uint)k);

}

private delegate void Func();

public static void UnregisterHotKey(Form f)

{

try

{

UnregisterHotKey(f.Handle, keyId); // modify this if you want more than one hotkey

}

catch (Exception ex)

{

MessageBox.Show(ex.ToString());

}

}

}

public partial class Form1 : Form, IDisposable

{

protected override void OnLoad(EventArgs e)

{

base.OnLoad(e);

Keys k = Keys.A | Keys.Control;

WindowsShell.RegisterHotKey(this, k);

}

// CF Note: The WndProc is not present in the Compact Framework (as of vers. 3.5)! please derive from the MessageWindow class in order to handle WM_HOTKEY

protected override void WndProc(ref Message m)

{

base.WndProc(ref m);

if (m.Msg == WindowsShell.WM_HOTKEY)

this.Visible = !this.Visible;

}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)

{

WindowsShell.UnregisterHotKey(this);

}

}

using System;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Threading;

/// <summary> This class allows you to manage a hotkey </summary>

public class GlobalHotkeys : IDisposable

{

[DllImport( "user32", SetLastError = true )]

[return: MarshalAs( UnmanagedType.Bool )]

public static extern bool RegisterHotKey (IntPtr hwnd, int id, uint fsModifiers, uint vk);

[DllImport( "user32", SetLastError = true )]

public static extern int UnregisterHotKey (IntPtr hwnd, int id);

[DllImport( "kernel32", SetLastError = true )]

public static extern short GlobalAddAtom (string lpString);

[DllImport( "kernel32", SetLastError = true )]

public static extern short GlobalDeleteAtom (short nAtom);

public const int MOD_ALT = 1;

public const int MOD_CONTROL = 2;

public const int MOD_SHIFT = 4;

public const int MOD_WIN = 8;

public const int WM_HOTKEY = 0x312;

public GlobalHotkeys()

{

this.Handle = Process.GetCurrentProcess().Handle;

}

/// <summary>Handle of the current process</summary>

public IntPtr Handle;

/// <summary>The ID for the hotkey</summary>

public short HotkeyID { get; private set; }

/// <summary>Register the hotkey</summary>

public void RegisterGlobalHotKey(int hotkey, int modifiers, IntPtr handle)

{

UnregisterGlobalHotKey();

this.Handle = handle;

RegisterGlobalHotKey(hotkey, modifiers);

}

/// <summary>Register the hotkey</summary>

public void RegisterGlobalHotKey(int hotkey, int modifiers)

{

UnregisterGlobalHotKey();

try

{

// use the GlobalAddAtom API to get a unique ID (as suggested by MSDN)

string atomName = Thread.CurrentThread.ManagedThreadId.ToString("X8") + this.GetType().FullName;

HotkeyID = GlobalAddAtom(atomName);

if (HotkeyID == 0)

throw new Exception("Unable to generate unique hotkey ID. Error: " + Marshal.GetLastWin32Error().ToString());

// register the hotkey, throw if any error

if (!RegisterHotKey(this.Handle, HotkeyID, (uint)modifiers, (uint)hotkey))

throw new Exception("Unable to register hotkey. Error: " + Marshal.GetLastWin32Error().ToString());

}

catch (Exception ex)

{

// clean up if hotkey registration failed

Dispose();

Console.WriteLine(ex);

}

}

/// <summary>Unregister the hotkey</summary>

public void UnregisterGlobalHotKey()

{

if ( this.HotkeyID != 0 )

{

UnregisterHotKey(this.Handle, HotkeyID);

// clean up the atom list

GlobalDeleteAtom(HotkeyID);

HotkeyID = 0;

}

}

public void Dispose()

{

UnregisterGlobalHotKey();

}

}

GlobalHotkeys hotkey;

hotkey = new GlobalHotkeys();

hotkey.RegisterGlobalHotKey( (int) Keys.F11, GlobalHotkeys.MOD_CONTROL );

hotkey.UnregisterGlobalHotKey();

protected override void WndProc (ref Message m)

{

const int WM_HOTKEY = 0x0312;

switch ( m.Msg )

{

case WM_HOTKEY:

{

if ((short)m.WParam == hotkey.HotkeyID)

{

// do your thing

}

break;

}

default:

{

base.WndProc(ref m);

break;

}

}

}

The ManagedWindowsApi project () provides a Hotkey class to register global hotkeys.

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