字符转化时间


问:我想将字符转化为Ctime对象。
答：这有一个非常简单的函数，您可以在此上面加入你所需要的：

BOOL ScanTime
(
   Ctime   &time,                // o - filled in time structure
   LPCTSTR lpszTime,             // I - the string containing the time to
be extracted
   LPCTSTR lpszFormat            // I - the time format to extract
according to
)
{
   int nYear  = 1980;            // extracted time fields
   int nMonth = 1;
   int nDay   = 1;
   int nHour  = 0;
   int nMin   = 0;
   int nSec   = 0;
   int nFlag  = DATE_TIME;       // DATE_TIME / DATE_ONLY / TIME_ONLY
   Cstring msg;

   // start at the beginning

   char *pTime = (char *)lpszTime;
   char *pFmt  = (char *)lpszFormat;

   while (*pFmt != '\0')
   {
      if (*pFmt == '%')
      {
         pFmt++;
         switch (*pFmt)
         {
            case 'Y' : // year with century
               sscanf (pTime,"%4d",&nYear);
               if (nYear <1980 || nYear> 2036)
               {
                  msg.Format ("Invalid year (%d)",nYear);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=4;
               break;

            case 'y' : // year without century (00-99)
               sscanf (pTime,"%2d",&nYear);
               nYear = nYear + (nYear > 36 ? 1900 : 2000);
               if (nYear <1980 || nYear> 2036)
               {
                  msg.Format ("Invalid year (%d)",nYear);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            case 'm' : // month (01-12)
               sscanf (pTime,"%2d",&nMonth);
               if (nMonth <1 || nMonth> 12)
               {
                  msg.Format ("Invalid month (%d)",nMonth);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            case 'd' : // day of month (01-31)
               sscanf (pTime,"%2d",&nDay);
               if (nDay <1 || nDay> 31)
               {
                  msg.Format ("Invalid day (%d)",nDay);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            case 'H' : // hour (00-23)
               sscanf (pTime,"%2d",&nHour);
               if (nHour <0 || nHour> 23)
               {
                  msg.Format ("Invalid hour (%d)",nHour);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            case 'M' : // minute (00-59)
               sscanf (pTime,"%2d",&nMin);
               if (nMin <0 || nMin> 59)
               {
                  msg.Format ("Invalid minute (%d)",nMin);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            case 'S' : // second (00-59)
               sscanf (pTime,"%2d",&nSec);
               if (nSec <1 || nSec> 31)
               {
                  msg.Format ("Invalid second (%d)",nSec);
                  AfxMessageBox (msg);
                  return (FALSE);
               }
               pTime+=2;
               break;

            default :
               msg.Format("Invalid format specifier (%c)",*pFmt);
               AfxMessageBox(msg);
               return (FALSE);
               break;
         }
      }
      else
      {
         if (!isdigit((int)(*pTime)))
         {
            if (*pTime == *pFmt)
            {
               pTime++;
            }
            else
            {
               msg.Format ("Character mismatch : Expected %c, found
%c",*pFmt,*pTime);
               AfxMessageBox ((LPCTSTR)msg);
               return (FALSE);
            }
         }
      }
      pFmt++;
   }

   // success

   time = Ctime(nYear,nMonth,nDay,nHour,nMin,nSec);
   return (TRUE);
}