the initial state of a EVENT using CreateEvent

Question

HANDLE WINAPI CreateEvent(
  _In_opt_  LPSECURITY_ATTRIBUTES lpEventAttributes,
  _In_      BOOL bManualReset,
  _In_      BOOL bInitialState,
  _In_opt_  LPCTSTR lpName
);

The CreateEvent function is defined above, and I notice many kinect SDKs use the following parameters:

CreateEvent(NULL,TRUE,FALSE,NULL);

 I've see some SDK sample, though the initial state is false, but when they use some codes like

WaitForSingleObject(m_hNextColorFrameEvent, 0);

the return value shows that the event is signaled. But I don't see any SetEvent function in the program. I guess there might be some function setting the state to TRUE, but I'm not sure, can anyone help me, thanks a lot.

Kang 

Answer 1

When you create the event, you pass this to the API to grab a frame. It is the Kinect runtime that will set this to notify your application that a frame is ready.

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Carmine Sirignano - MSFT

Answer 2

See this post about events. I at least found one sample where the events never get reset.

http://social.msdn.microsoft.com/Forums/en-US/e6ad43b9-9543-4005-8336-a518008bf290/facetrackingvisualization-singleface-sample-events-fix-required?forum=kinectsdkfacetracking