_ftime_s, _ftime32_s, _ftime64_s

مقالة
06/30/2010

Gets the current time. These are versions of _ftime, _ftime32, _ftime64 with security enhancements as described in Security Features in the CRT.

errno_t _ftime_s( 
   struct _timeb *timeptr 
);
errno_t _ftime32_s( 
   struct __timeb32 *timeptr 
);
errno_t _ftime64_s( 
   struct __timeb64 *timeptr 
);

Parámetros

timeptr
Pointer to a _timeb,__timeb32, or __timeb64 structure.

Valor devuelto

Zero if successful, an error code on failure. If timeptr is NULL, the return value is EINVAL.

Comentarios

The _ftime_s function gets the current local time and stores it in the structure pointed to by timeptr*.* The _timeb,__timeb32,and__timeb64 structures are defined in SYS\Timeb.h. They contain four fields, which are listed in the following table.

dstflag
Nonzero if daylight savings time is currently in effect for the local time zone. (See _tzset for an explanation of how daylight savings time is determined.)
millitm
Fraction of a second in milliseconds.
time
Time in seconds since midnight (00:00:00), January 1, 1970, coordinated universal time (UTC).
timezone
Difference in minutes, moving westward, between UTC and local time. The value of timezone is set from the value of the global variable _timezone (see _tzset).

_ftime64_s, which uses the __timeb64 structure, allows file-creation dates to be expressed up through 23:59:59, December 31, 3000, UTC; whereas _ftime32_s only represents dates through 03:14:07 January 19, 2038, UTC. Midnight, January 1, 1970, is the lower bound of the date range for all these functions.

In Visual C++ 2005, _ftime_s is equivalent to _ftime64_s and _timeb contains a 64-bit time. This is true unless _USE_32BIT_TIME_T is defined, in which case the old behavior is in effect; _ftime_s uses a 32-bit time and _timeb contains a 32-bit time.

_ftime_s validates its parameters. If passed a null pointer as timeptr, the function invokes the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, the function sets errno to EINVAL.

Requisitos

Function	Required header
_ftime_s	<sys/types.h> and <sys/timeb.h>
_ftime32_s	<sys/types.h> and <sys/timeb.h>
_ftime64_s	<sys/types.h> and <sys/timeb.h>

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Ejemplo

// crt_ftime64_s.c
// This program uses _ftime64_s to obtain the current
// time and then stores this time in timebuffer.  #include <stdio.h>
#include <sys/timeb.h>
#include <time.h>

int main( void )
{
   struct _timeb timebuffer;
   char timeline[26];
   errno_t err;
   time_t time1;
   unsigned short millitm1;
   short timezone1;
   short dstflag1;

   _ftime64_s( &timebuffer );

    time1 = timebuffer.time;
    millitm1 = timebuffer.millitm;
    timezone1 = timebuffer.timezone;
    dstflag1 = timebuffer.dstflag;

   printf( "Seconds since midnight, January 1, 1970 (UTC): %I64d\n", 
   time1);
   printf( "Milliseconds: %d\n", millitm1);
   printf( "Minutes between UTC and local time: %d\n", timezone1);
   printf( "Daylight savings time flag (1 means Daylight time is in "
           "effect): %d\n", dstflag1); 
   
   err = ctime_s( timeline, 26, & ( timebuffer.time ) );
   if (err)
   {
       printf("Invalid argument to ctime_s. "  );
   }
   printf( "The time is %.19s.  %hu %s", timeline, timebuffer.millitm,
           &timeline[20] );
}

Seconds since midnight, January 1, 1970 (UTC): 1051553334
Milliseconds: 230
Minutes between UTC and local time: 480
Daylight savings time flag (1 means Daylight time is in effect): 1
The time is Mon Apr 28 11:08:54.230 2003