=============================================CÓïÑԽű¾£¬
       #include <time.h>

       struct tm *timep;
       time_t c;
       c=time(0);
       int addresstochange=0x0096ABCC;
       timep=localtime(&c);

       if (timep->tm_sec>=30)
         *(int *)addresstochange=1000;
       else
           *(int *)addresstochange=2000;
===========================================