public IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam)
{
bool fEatKeyStroke = false;
var wParamTyped = wParam.ToInt32();
if (Enum.IsDefined(typeof(KeyboardState), wParamTyped))
{
LowLevelKeyboardInputEvent p = (LowLevelKeyboardInputEvent)Marshal.PtrToStructure(lParam, typeof(LowLevelKeyboardInputEvent));
var eventArguments = new GlobalKeyboardListenerEventArgs(p, (KeyboardState)wParamTyped);
EventHandler <GlobalKeyboardListenerEventArgs> handler = KeyboardPressed;
CheckKeys(eventArguments);
handler?.Invoke(this, eventArguments);
fEatKeyStroke = eventArguments.Handled;
}
return(fEatKeyStroke ? (IntPtr)1 : SystemDll.User32.CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam));
}
private void CheckKeys(GlobalKeyboardListenerEventArgs e)
{
// LCtrl
if (e.KeyboardData.VirtualCode == 162)
{
if (e.KeyboardState == KeyboardState.KeyDown)
{
IsLCtrlPressing = true;
}
if (e.KeyboardState == KeyboardState.KeyUp)
{
IsLCtrlPressing = false;
}
}
// RCtrl
if (e.KeyboardData.VirtualCode == 25)
{
if (e.KeyboardState == KeyboardState.KeyDown)
{
IsRCtrlPressing = true;
}
if (e.KeyboardState == KeyboardState.KeyUp)
{
IsRCtrlPressing = false;
}
}
// LAlt
if (e.KeyboardData.VirtualCode == 164)
{
if (e.KeyboardState == KeyboardState.SysKeyDown || e.KeyboardState == KeyboardState.KeyDown)
{
IsLAltPressing = true;
}
if (e.KeyboardState == KeyboardState.SysKeyUp || e.KeyboardState == KeyboardState.KeyUp)
{
IsLAltPressing = false;
}
}
// RAlt
if (e.KeyboardData.VirtualCode == 21)
{
if (e.KeyboardState == KeyboardState.SysKeyDown || e.KeyboardState == KeyboardState.KeyDown)
{
IsRAltPressing = true;
}
if (e.KeyboardState == KeyboardState.SysKeyUp || e.KeyboardState == KeyboardState.KeyUp)
{
IsRAltPressing = false;
}
}
// LShift
if (e.KeyboardData.VirtualCode == 160)
{
if (e.KeyboardState == KeyboardState.KeyDown)
{
IsLShiftPressing = true;
}
if (e.KeyboardState == KeyboardState.KeyUp)
{
IsLShiftPressing = false;
}
}
// RShift
if (e.KeyboardData.VirtualCode == 161)
{
if (e.KeyboardState == KeyboardState.KeyDown)
{
IsRShiftPressing = true;
}
if (e.KeyboardState == KeyboardState.KeyUp)
{
IsRShiftPressing = false;
}
}
}
