七种vc延时方法（Seven VC delay methods）.doc

七种vc延时方法（Seven VC delay methods）.doc七种vc延时方法(Seven VC delay methods)
Seven VC delay
One way: WM_TIMER message mapping in VC can be a simple time control. First, the function call SetTimer () set the time interval, such as SetTimer (0200, NULL) is to set the time interval of 200ms. Then increase the time response function of OnTimer in the application (), and add a statement response in this function is used plete the arrival time of the operation. This timing method is very simple, can achieve a timing function, but its timing function as Sleep () function of the delay function, the precision is very low, only the minimum time of 30ms accuracy, CPU occupation is low, and the timer messages in a multitasking operating system in very low priority, not to respond in a timely manner, often can not meet the application of real-time control environment. Can only be used to achieve the dynamic display of bitmap such as timing accuracy without high requirement. Such as the example of Timer1 project.
Two: the use of sleep VC () function to realize time delay, its unit is MS, such as delay of 2 seconds, sleep (2000). The accuracy is very low, only the minimum time of 30ms accuracy, with the disadvantage of sleep function lies in the delay period can not deal with other news, if the time is too long, just like the crash, CPU occupancy rate is very high, can only be used for less demanding delay procedures. Such as the ex