how to detect when kinect is disconnected / unplugged while program is running? - c++

Question

I'm working with one of the official Kinect SDK 1.5 examples, and I'm trying to figure out how to add a check to detect when the Kinect is being disconnected. Currently the app will just freeze, so there must be a way to prevent this from happening.
This is the main message loop from the SDK example:
// Main message loop
while (WM_QUIT != msg.message)
{
hEvents[0] = m_hNextDepthFrameEvent;
// Check to see if we have either a message (by passing in QS_ALLINPUT)
// Or a Kinect event (hEvents)
// Update() will check for Kinect events individually, in case more than one are signalled
DWORD dwEvent = MsgWaitForMultipleObjects(eventCount, hEvents, FALSE, INFINITE, QS_ALLINPUT);
// Check if this is an event we're waiting on and not a timeout or message
if (WAIT_OBJECT_0 == dwEvent)
{
Update();
}
// does not work.
bool bla = m_pNuiSensor->NuiStatus();
if (NULL == m_pNuiSensor)
{
cout << 1 << endl;
}
if (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE))
{
// If a dialog message will be taken care of by the dialog proc
if ((hWndApp != NULL) && IsDialogMessageW(hWndApp, &msg))
{
continue;
}
TranslateMessage(&msg);
DispatchMessageW(&msg);
}
}
return static_cast<int>(msg.wParam);
I've added the following bit:
// does not work, bla will always be the same value.
bool bla = m_pNuiSensor->NuiStatus();
if (NULL == m_pNuiSensor)
{
cout << 1 << endl;
}
since I was assuming that maybe NuiStatus would be a way to detect the disconnect. Unfortunately it won't work. The same is true for checking whether m_pNuiSensor is NULL.
So what's the way to detect a disconnect in the running app?
EDIT1: should I be using NuiSetDeviceStatusCallback?

Answer 1

In the documentation it says that NuiStatus returns HRESULT and not bool, so shouldn't it be
HRESULT bla = m_pNuiSensor->NuiStatus();
if (bla == E_NUI_NOTCONNECTED)
{
cout << 1 << endl;
}
instead?

Answer 2

the following solution works.
// check if m_pNuiSensor is initialized.
if (NULL != m_pNuiSensor)
{
// get current status & check if not ok.
HRESULT current_status = m_pNuiSensor->NuiStatus();
if (current_status != S_OK )
{
SetStatusMessage(L"Lost connection to Kinect!");
}
}