public void ReleaseKey(uint ps2Set1keyScanCode)
{
try
{
ChangeKeyState(KeyEvent.KeyBreak, HidHelper.GetHidUsageFromPs2Set1(ps2Set1keyScanCode));
}
catch (Exception e)
{
Debug.WriteLine("Failed to change the key state due to: " + e.Message);
}
}
private void ChangeKeyState(KeyEvent keyEvent, byte hidUsageScanCode)
{
lock (m_lock)
{
if (!m_initializationFinished)
{
return;
}
if (keyEvent == KeyEvent.KeyMake)
{
if (HidHelper.IsMofifierKey(hidUsageScanCode))
{
Debug.WriteLine("Modifier key depressed: " + hidUsageScanCode);
m_currentlyDepressedModifierKeys.Add(hidUsageScanCode);
}
else
{
Debug.WriteLine("Key depressed: " + hidUsageScanCode);
m_currentlyDepressedKeys.Add(hidUsageScanCode);
}
}
else
{
if (HidHelper.IsMofifierKey(hidUsageScanCode))
{
Debug.WriteLine("Modifier key released: " + hidUsageScanCode);
m_currentlyDepressedModifierKeys.Remove(hidUsageScanCode);
}
else
{
Debug.WriteLine("Key released: " + hidUsageScanCode);
m_currentlyDepressedKeys.Remove(hidUsageScanCode);
}
}
if (m_hidKeyboardReport.SubscribedClients.Count == 0)
{
Debug.WriteLine("No clients are currently subscribed to the keyboard report.");
return;
}
var reportValue = new byte[c_sizeOfKeyboardReportDataInBytes];
// The first byte of the report data is a modifier key bitfield.
reportValue[0] = 0x0;
foreach (var modifierKeyPressedScanCode in m_currentlyDepressedModifierKeys)
{
reportValue[0] |= HidHelper.GetFlagOfModifierKey(modifierKeyPressedScanCode);
}
// The second byte up to the last byte represent one key per byte.
int reportIndex = 1;
foreach (var keyPressedScanCode in m_currentlyDepressedKeys)
{
if (reportIndex >= reportValue.Length)
{
Debug.WriteLine("Too many keys currently depressed to fit into the report data. Truncating.");
break;
}
reportValue[reportIndex] = keyPressedScanCode;
reportIndex++;
}
if (!reportValue.SequenceEqual(m_lastSentKeyboardReportValue))
{
Debug.WriteLine("Sending keyboard report value notification with data: " + GetStringFromBuffer(reportValue));
reportValue.CopyTo(m_lastSentKeyboardReportValue, 0);
// Waiting for this operation to complete is no longer necessary since now ordering of notifications
// is guaranteed for each client. Not waiting for it to complete reduces delays and lags.
// Note that doing this makes us unable to know if the notification failed to be sent.
var asyncOp = m_hidKeyboardReport.NotifyValueAsync(reportValue.AsBuffer());
}
}
}