One-day training of Windows APIs (66) createwaitabletimer and setwaitabletimer Functions

Users feel that the software is easy to use, that is, they can do some work on a regular basis without the need to participate. For example, update the virus database regularly every day, regularly download movies, and regularly update characters in the game. To implement these functions, you can use the timer API Function Createwaitabletimer And Setwaitabletimer To achieve this. API The clock created by the function is relatively accurate and can achieve 100 Times 10 One second per hundred million. Function Createwaitabletimer And Setwaitabletimer The statement is as follows: Winbaseapi _ Out Handle Winapi Createwaitabletimera ( _ In_opt lpsecurity_attributes lptimerattributes, _ In bool bmanualreset, _ In_opt lpcstr lptimername ); Winbaseapi _ Out Handle Winapi Createwaitabletimerw ( _ In_opt lpsecurity_attributes lptimerattributes, _ In bool bmanualreset, _ In_opt lpcwstr lptimername ); # Ifdef Unicode # Define createwaitabletimer createwaitabletimerw # Else # Define createwaitabletimer createwaitabletimera # Endif //! Unicode Winbaseapi Bool Winapi Setwaitabletimer ( _ In handle htimer, _ In const large_integer * lpduetime, _ In long lperiod, _ In_opt ptimerapcroutine pfncompletionroutine, _ In_opt lpvoid lpargtocompletionroutine, _ In bool fresume ); Lptimerattributes Is the property of the timer. Bmanualreset Whether to manually reset. Lptimername Is the name of the timer. Htimer Is the timer handle. Lpduetime Is to set the timer time interval, when set to positive is absolute time; when set to negative is relative time. Lperiod Is the cycle. Pfncompletionroutine Is to set the callback function. Lpargtocompletionroutine Is the parameter sent to the callback function. Fresume Is to set whether the system is automatically restored. An example of calling a function is as follows: #001 // Create a timer #002 // Cai junsheng 2007/11/06 QQ: 9073204 Shenzhen #003 int createtesttimer (void) #004 { #005 handle htimer = NULL; #006 large_integer liduetime; #007 #008 // Set relative time 10 Seconds. #009 liduetime. quadpart =-100000000; #010 #011 // Create a timer. #012 htimer = createwaitabletimer (null, true, _ T ("testwaitabletimer ")); #013 if (! Htimer) #014 { #015 return 1; #016} #017 #018 outputdebugstring (_ T ("10 Second Timer \ R \ n ")); #019 #020 // Set 10 Seconds. #021 if (! Setwaitabletimer (htimer, & liduetime, 0, null, null, 0 )) #022 { #023 // #024 closehandle (htimer ); #025 return 2; #026} #027 #028 // The timer has a signal. #029 if (waitforsingleobject (htimer, infinite )! = Wait_object_0) #030 { #031 outputdebugstring (_ T ("10 Second timer Error \ R \ n ")); #032 // #033 closehandle (htimer ); #034 return 3; #035} #036 else #037 { #038 // 10 In seconds. #039 outputdebugstring (_ T ("10 Seconds timer arrived \ R \ n ")); #040} #041 #042 // #043 closehandle (htimer ); #044 return 0; #045}