Solution:

It is results from the setting of checking event time interval. As the program code below, the example set the check event time to be 5000 milliseconds. It is recommended to change the time interval which is suitable for user's application, such as 50000 milliseconds. while(TickValue > GetTickCount()) { // Check message ptCheckEvent.EventType = &usEventType; ptCheckEvent.Milliseconds = 5000;