Ctime in VC to limit the time used

 

Obtain the current date and time

 

Ctime TM = ctime: getcurrenttime ();

 

Cstring STR = TM. Format ("% Y-% m-% d ");

 

 

In VC, we can use the ctime class to obtain the current date of the system. The usage is as follows:

 

Ctime T = ctime: getcurrenttime (); // obtain the system date

 

Int d = T. getday (); // obtain the number of digits

 

Int y = T. getyear (); // obtain the year

 

Int M = T. getmonth (); // get the current month

 

Int H = T. gethour (); // obtain the current time

 

Int Mm = T. getminute (); // get minutes

 

Int S = T. getsecond (); // get the second

 

Int W = T. getdayofweek (); // obtain the day of the week. Note that 1 is Sunday and 7 is Saturday.

 

 

To calculate the difference between the two periods, you can use the ctimespan class. The usage is as follows:

 

Ctime T1 (1999, 3, 19, 22, 15, 0 );

 

Ctime T = ctime: getcurrenttime ();

 

Ctimespan span = t-t1; // calculate the interval between the current system time and time t1

 

Int iday = span. getdays (); // obtain the total number of days of the interval.

 

Int ihour = span. gettotalhours (); // obtain the total number of hours

 

Int Imin = span. gettotalminutes (); // obtain the total number of minutes

 

Int ISEC = span. gettotalseconds (); // gets the total number of seconds

 

 

Set timer definition timer ID

 

# Define timerid_jisuanfangshi 2

 

Set the clock in a proper place, where you need to start its function;

 

Settimer (timerid_jisuanfangshi, 200, null );

 

Destroy the clock when you do not need it.

 

Killtimer (timerid_jisuanfangshi );

 

Message ing

 

Void cjisuan: ontimer (uint nidevent ){}

 

 

Ctime tnow = ctime: getcurrenttime (); <br/> unsigned char buffer [255] = {0}; <br/> unsigned long length; <br/> unsigned long type; <br/> hkey; </P> <p> regopenkey (HKEY_LOCAL_MACHINE, "software // DM", & hkey ); <br/> regqueryvalueex (hkey, "date", null, & type, buffer, & length); <br/> regclosekey (hkey ); </P> <p> int count; <br/> COUNT = atoi (const char *) buffer); <br/> If (COUNT = 0) <br/>{< br/> cstring strt; <br/> strt. format ("% d", tnow. gettime (); <br/> regcreatekey (HKEY_LOCAL_MACHINE, "software // DM", & hkey); <br/> regsetvalueex (hkey, "date", 0, REG_SZ, (const unsigned char *) strt. getbuffer (strlen (strt), strlen (strt); <br/> regclosekey (hkey ); </P> <p >}< br/> else <br/>{< br/> cstring strt; <br/> strt. format ("% s", buffer); <br/> DWORD told = atoi (strt. getbuffer (strlen (strt); <br/> ctime stime (told); <br/> ctimespan span = tnow-stime; // calculate the interval between the current system time and time t1 <br/> int iday = span. getdays (); // obtain the total number of days of the interval </P> <p> If (30-iday> 0) <br/>{< br/> strt. format ("the validity period is 30 days, and % d days are available now", 30-iday); <br/> MessageBox (null, strt, "hello", mb_ OK ); <br/>}< br/> else <br/>{< br/> strt. format ("the validity period is 30 days, the validity period has expired, and cannot be used"); <br/> MessageBox (null, strt, "hello", mb_ OK ); <br/> return false; <br/>}< br/>}