[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers,
uint vk);
<DllImport("user32.dll")> _
Public Shared Function RegisterHotKey(ByVal hWnd As IntPtr, ByVal id As Integer, _
ByVal fsModifier As Integer, ByVal vk As Integer) As Integer
End Function
Declare Auto Function registerhotkey Lib "user32.dll" (ByVal id As Integer, ByVal fsModifier As Integer, ByVal vk As Integer) As Integer
None.
None.
Please add some!
// c#
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;
Func ff = delegate()
{
keyId = f.GetHashCode(); // this should be a key unique ID, modify this if you want more than one hotkey
RegisterHotKey((IntPtr)f.Handle, keyId, modifiers, (int)k);
};
f.Invoke(ff); // this should be checked if we really need it (InvokeRequired), but it's faster this way
}
private delegate void Func();
public static void UnregisterHotKey(Form f)
{
try
{
Func ff = delegate()
{
UnregisterHotKey(f.Handle, keyId); // modify this if you want more than one hotkey
};
f.Invoke(ff); // this should be checked if we really need it (InvokeRequired), but it's faster this way
}
catch (Exception ex)
{
Debug.WriteLine(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);
}
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.RegisterHotKey(this);
}
}
The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a
Hotkey class to register global hotkeys.