public void StopStopwatch()
{
stopwatch.Stop();
var e = new KeyboardInput
{
Key = Keys.None,
KeyStatus = KeyStatus.Down,
Millis = stopwatch.ElapsedMilliseconds
};
KeyboardStatusChanged?.Invoke(this, e);
}
/// <summary>
/// A callback function which will be called every time a keyboard activity detected.
/// </summary>
/// <param name="nCode">
/// [in] Specifies whether the hook procedure must process the message.
/// If nCode is HC_ACTION, the hook procedure must process the message.
/// If nCode is less than zero, the hook procedure must pass the message to the
/// CallNextHookEx function without further processing and must return the
/// value returned by CallNextHookEx.
/// </param>
/// <param name="wParam">
/// [in] Specifies whether the message was sent by the current thread.
/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
/// </param>
/// <param name="lParam">
/// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
/// </param>
/// <returns>
/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
/// procedure does not call CallNextHookEx, the return value should be zero.
/// </returns>
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
//Indicates if any of underlaing events set e.Handled flag
bool handled = false;
//If was Ok and someone listens to events
if ((nCode >= 0) && KeyboardStatusChanged != null)
{
//Read structure KeyboardHookStruct at lParam
var myKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
var keyData = (Keys)myKeyboardHookStruct.vkCode;
var e = new KeyboardInput
{
Key = keyData,
Millis = stopwatch.ElapsedMilliseconds
};
// Raise KeyDown
if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN)
{
e.KeyStatus = KeyStatus.Down;
}
// Raise KeyUp
if (wParam == WM_KEYUP || wParam == WM_SYSKEYUP)
{
e.KeyStatus = KeyStatus.Up;
}
stopwatch.Restart();
KeyboardStatusChanged?.Invoke(this, e);
handled = handled || e.Handled;
}
//If event handled in application do not handoff to other listeners
if (handled)
{
return(1);
}
return(CallNextHookEx(hKeyboardHook, nCode, wParam, lParam));
}
private void OnKeyboardStatusChanged(KeyboardStatusChangeEventArgs e)
{
// Trigger the event
KeyboardStatusChanged?.Invoke(e);
}
