/// <summary>
/// The callback for the keyboard hook.</summary>
/// <param name="code">
/// The hook code. If this is < 0, the callback shouldn’t do anyting.</param>
/// <param name="wParam">
/// The event type. Only <c>WM_(SYS)?KEY(DOWN|UP)</c> events are handled.</param>
/// <param name="lParam">
/// Information about the key pressed/released.</param>
private int hookProc(int code, int wParam, ref WinAPI.KeyboardHookStruct lParam)
{
if (code >= 0)
{
Keys key = (Keys) lParam.vkCode;
if (HookAllKeys || _hookedKeys.Contains(key))
{
if ((wParam == WinAPI.WM_KEYDOWN || wParam == WinAPI.WM_SYSKEYDOWN))
{
switch (key)
{
case Keys.ControlKey:
case Keys.LControlKey:
case Keys.RControlKey: _ctrl = true; break;
case Keys.Menu:
case Keys.LMenu:
case Keys.RMenu: _alt = true; break;
case Keys.ShiftKey:
case Keys.LShiftKey:
case Keys.RShiftKey: _shift = true; break;
case Keys.LWin:
case Keys.RWin: _win = true; break;
}
if (KeyDown != null)
{
var kea = new GlobalKeyEventArgs(key, lParam.scanCode, new ModifierKeysState(_ctrl, _alt, _shift, _win));
KeyDown(this, kea);
if (kea.Handled)
return 1;
}
}
else if ((wParam == WinAPI.WM_KEYUP || wParam == WinAPI.WM_SYSKEYUP))
{
switch (key)
{
case Keys.ControlKey:
case Keys.LControlKey:
case Keys.RControlKey: _ctrl = false; break;
case Keys.Menu:
case Keys.LMenu:
case Keys.RMenu: _alt = false; break;
case Keys.ShiftKey:
case Keys.LShiftKey:
case Keys.RShiftKey: _shift = false; break;
case Keys.LWin:
case Keys.RWin: _win = false; break;
}
if (KeyUp != null)
{
var kea = new GlobalKeyEventArgs(key, lParam.scanCode, new ModifierKeysState(_ctrl, _alt, _shift, _win));
KeyUp(this, kea);
if (kea.Handled)
return 1;
}
}
}
}
return WinAPI.CallNextHookEx(_hHook, code, wParam, ref lParam);
}
public static extern IntPtr SetWindowsHookEx(int idHook, WinAPI.KeyboardHookProc callback, IntPtr hInstance, uint threadId);