C++ (Cpp) EventQueue::Dequeue Examples

Example #1

File: SystemActivities.cpp Project: amyvmiwei/UnrealEngine4

eVrApiEventStatus SystemActivities_GetNextPendingEvent( EventQueue * queue, char * buffer, unsigned int const bufferSize )
{
	if ( buffer == NULL || bufferSize == 0 ) 
	{
		return VRAPI_EVENT_ERROR_INVALID_BUFFER;
	}
	
	if ( bufferSize < 2 ) 
	{
		buffer[0] = '\0';
		return VRAPI_EVENT_ERROR_INVALID_BUFFER;
	}

	if ( queue == NULL ) 
	{
		return VRAPI_EVENT_ERROR_INTERNAL;
	}

	EventQueue * q = reinterpret_cast< EventQueue* >( queue );
	EventData const * eventData;
	if ( !q->Dequeue( eventData ) ) 
	{
		return VRAPI_EVENT_NOT_PENDING;
	}

	OVR_strncpy( buffer, bufferSize, static_cast< char const * >( eventData->GetData() ), eventData->GetSize() );
	bool overflowed = eventData->GetSize() >= bufferSize;

	delete eventData;
	return overflowed ? VRAPI_EVENT_BUFFER_OVERFLOW : VRAPI_EVENT_PENDING;
}