Referencia de la Clase QTime

The QTime class provides clock time functions. Más...

#include <qdatetime.h>

Lista de todos los miembros.

Métodos públicos
	QTime ()
	QTime (int h, int m, int s=0, int ms=0)
bool	isNull () const
bool	isValid () const
int	hour () const
int	minute () const
int	second () const
int	msec () const
QString	toString (Qt::DateFormat f=Qt::TextDate) const
QString	toString (const QString &format) const
bool	setHMS (int h, int m, int s, int ms=0)
QTime	addSecs (int secs) const
int	secsTo (const QTime &) const
QTime	addMSecs (int ms) const
int	msecsTo (const QTime &) const
bool	operator== (const QTime &d) const
bool	operator!= (const QTime &d) const
bool	operator< (const QTime &d) const
bool	operator<= (const QTime &d) const
bool	operator> (const QTime &d) const
bool	operator>= (const QTime &d) const
void	start ()
int	restart ()
int	elapsed () const
	QTime ()
	QTime (int h, int m, int s=0, int ms=0)
bool	isNull () const
bool	isValid () const
int	hour () const
int	minute () const
int	second () const
int	msec () const
QString	toString (Qt::DateFormat f=Qt::TextDate) const
QString	toString (const QString &format) const
bool	setHMS (int h, int m, int s, int ms=0)
QTime	addSecs (int secs) const
int	secsTo (const QTime &) const
QTime	addMSecs (int ms) const
int	msecsTo (const QTime &) const
bool	operator== (const QTime &d) const
bool	operator!= (const QTime &d) const
bool	operator< (const QTime &d) const
bool	operator<= (const QTime &d) const
bool	operator> (const QTime &d) const
bool	operator>= (const QTime &d) const
void	start ()
int	restart ()
int	elapsed () const
Métodos públicos estáticos
static QTime	currentTime ()
static QTime	currentTime (Qt::TimeSpec)
static QTime	fromString (const QString &s, Qt::DateFormat f=Qt::TextDate)
static bool	isValid (int h, int m, int s, int ms=0)
static QTime	currentTime ()
static QTime	currentTime (Qt::TimeSpec)
static QTime	fromString (const QString &s, Qt::DateFormat f=Qt::TextDate)
static bool	isValid (int h, int m, int s, int ms=0)
Amigas
class	QDateTime
Q_EXPORT QDataStream &	operator<< (QDataStream &, const QTime &)
Q_EXPORT QDataStream &	operator>> (QDataStream &, QTime &)
Q_EXPORT QDataStream &	operator<< (QDataStream &, const QTime &)
Q_EXPORT QDataStream &	operator>> (QDataStream &, QTime &)

---

Descripción detallada

The QTime class provides clock time functions.

A QTime object contains a clock time, i.e. the number of hours, minutes, seconds, and milliseconds since midnight. It can read the current time from the system clock and measure a span of elapsed time. It provides functions for comparing times and for manipulating a time by adding a number of (milli)seconds.

QTime uses the 24-hour clock format; it has no concept of AM/PM. It operates in local time; it knows nothing about time zones or daylight savings time.

A QTime object is typically created either by giving the number of hours, minutes, seconds, and milliseconds explicitly, or by using the static function currentTime(), which creates a QTime object that contains the system's clock time. Note that the accuracy depends on the accuracy of the underlying operating system; not all systems provide 1-millisecond accuracy.

The hour(), minute(), second(), and msec() functions provide access to the number of hours, minutes, seconds, and milliseconds of the time. The same information is provided in textual format by the toString() function.

QTime provides a full set of operators to compare two QTime objects. One time is considered smaller than another if it is earlier than the other.

The time a given number of seconds or milliseconds later than a given time can be found using the addSecs() or addMSecs() functions. Correspondingly, the number of (milli)seconds between two times can be found using the secsTo() or msecsTo() functions.

QTime can be used to measure a span of elapsed time using the start(), restart(), and elapsed() functions.

Ver también:

QDate, QDateTime

---

Documentación del constructor y destructor

QTime::QTime

(

)

[inline]

Constructs the time 0 hours, minutes, seconds and milliseconds, i.e. 00:00:00.000 (midnight). This is a valid time.

Ver también:

isValid()

QTime::QTime	(	int	h,
		int	m,
		int	s = 0,
		int	ms = 0
	)

Constructs a time with hour h, minute m, seconds s and milliseconds ms.

h must be in the range 0..23, m and s must be in the range 0..59, and ms must be in the range 0..999.

Ver también:

isValid()

QTime::QTime

(

)

[inline]

QTime::QTime	(	int	h,
		int	m,
		int	s = 0,
		int	ms = 0
	)

---

Documentación de las funciones miembro

QTime QTime::addMSecs

(

int

ms

)

const

Returns a QTime object containing a time ms milliseconds later than the time of this object (or earlier if ms is negative).

Note that the time will wrap if it passes midnight. See addSecs() for an example.

Ver también:

addSecs(), msecsTo()

QTime QTime::addMSecs

(

int

ms

)

const

QTime QTime::addSecs

(

int

secs

)

const

QTime QTime::addSecs

(

int

nsecs

)

const

Returns a QTime object containing a time nsecs seconds later than the time of this object (or earlier if nsecs is negative).

Note that the time will wrap if it passes midnight.

Example:

    QTime n( 14, 0, 0 );                // n == 14:00:00
    QTime t;
    t = n.addSecs( 70 );                // t == 14:01:10
    t = n.addSecs( -70 );               // t == 13:58:50
    t = n.addSecs( 10*60*60 + 5 );      // t == 00:00:05
    t = n.addSecs( -15*60*60 );         // t == 23:00:00

Ver también:

addMSecs(), secsTo(), QDateTime::addSecs()

QTime QTime::currentTime

(

void

)

[static]

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Returns the current time as reported by the system clock.

Note that the accuracy depends on the accuracy of the underlying operating system; not all systems provide 1-millisecond accuracy.

QTime QTime::currentTime

(

Qt::TimeSpec

ts

)

[static]

Returns the current time as reported by the system clock, for the TimeSpec ts. The default TimeSpec is LocalTime.

Note that the accuracy depends on the accuracy of the underlying operating system; not all systems provide 1-millisecond accuracy.

Ver también:

Qt::TimeSpec

static QTime QTime::currentTime

(

)

[static]

static QTime QTime::currentTime

(

Qt::TimeSpec

)

[static]

int QTime::elapsed

(

)

const

Returns the number of milliseconds that have elapsed since the last time start() or restart() was called.

Note that the counter wraps to zero 24 hours after the last call to start() or restart.

Note that the accuracy depends on the accuracy of the underlying operating system; not all systems provide 1-millisecond accuracy.

Atención:

If the system's clock setting has been changed since the last time start() or restart() was called, the result is undefined. This can happen when daylight savings time is turned on or off.

Ver también:

start(), restart()

int QTime::elapsed

(

)

const

QTime QTime::fromString	(	const QString &	s,
		Qt::DateFormat	f = Qt::TextDate
	)		[static]

Returns the representation s as a QTime using the format f, or an invalid time if this is not possible.

Atención:

Note that Qt::LocalDate cannot be used here.

static QTime QTime::fromString	(	const QString &	s,
		Qt::DateFormat	f = Qt::TextDate
	)		[static]

int QTime::hour

(

)

const

Returns the hour part (0..23) of the time.

int QTime::hour

(

)

const

bool QTime::isNull

(

)

const [inline]

Returns TRUE if the time is equal to 00:00:00.000; otherwise returns FALSE. A null time is valid.

Ver también:

isValid()

bool QTime::isNull

(

)

const [inline]

bool QTime::isValid

(

void

)

const

Returns TRUE if the time is valid; otherwise returns FALSE. The time 23:30:55.746 is valid, whereas 24:12:30 is invalid.

Ver también:

isNull()

bool QTime::isValid	(	int	h,
		int	m,
		int	s,
		int	ms = 0
	)		[static]

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Returns TRUE if the specified time is valid; otherwise returns FALSE.

The time is valid if h is in the range 0..23, m and s are in the range 0..59, and ms is in the range 0..999.

Example:

    QTime::isValid(21, 10, 30); // returns TRUE
    QTime::isValid(22, 5,  62); // returns FALSE

static bool QTime::isValid	(	int	h,
		int	m,
		int	s,
		int	ms = 0
	)		[static]

bool QTime::isValid

(

)

const

int QTime::minute

(

)

const

Returns the minute part (0..59) of the time.

int QTime::minute

(

)

const

int QTime::msec

(

)

const

int QTime::msec

(

)

const

Returns the millisecond part (0..999) of the time.

int QTime::msecsTo

(

const QTime &

t

)

const

Returns the number of milliseconds from this time to t (which is negative if t is earlier than this time).

Because QTime measures time within a day and there are 86400 seconds in a day, the result is always between -86400000 and 86400000 msec.

Ver también:

secsTo()

int QTime::msecsTo

(

const QTime &

)

const

bool QTime::operator!=

(

const QTime &

d

)

const [inline]

bool QTime::operator!=

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is different from t; otherwise returns FALSE.

bool QTime::operator<

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is earlier than t; otherwise returns FALSE.

bool QTime::operator<

(

const QTime &

d

)

const [inline]

bool QTime::operator<=

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is earlier than or equal to t; otherwise returns FALSE.

bool QTime::operator<=

(

const QTime &

d

)

const [inline]

bool QTime::operator==

(

const QTime &

d

)

const [inline]

bool QTime::operator==

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is equal to t; otherwise returns FALSE.

bool QTime::operator>

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is later than t; otherwise returns FALSE.

bool QTime::operator>

(

const QTime &

d

)

const [inline]

bool QTime::operator>=

(

const QTime &

t

)

const [inline]

Returns TRUE if this time is later than or equal to t; otherwise returns FALSE.

bool QTime::operator>=

(

const QTime &

d

)

const [inline]

int QTime::restart

(

)

int QTime::restart

(

)

Sets this time to the current time and returns the number of milliseconds that have elapsed since the last time start() or restart() was called.

This function is guaranteed to be atomic and is thus very handy for repeated measurements. Call start() to start the first measurement and then restart() for each later measurement.

Note that the counter wraps to zero 24 hours after the last call to start() or restart().

Atención:

If the system's clock setting has been changed since the last time start() or restart() was called, the result is undefined. This can happen when daylight savings time is turned on or off.

Ver también:

start(), elapsed(), currentTime()

int QTime::second

(

)

const

Returns the second part (0..59) of the time.

int QTime::second

(

)

const

int QTime::secsTo

(

const QTime &

t

)

const

Returns the number of seconds from this time to t (which is negative if t is earlier than this time).

Because QTime measures time within a day and there are 86400 seconds in a day, the result is always between -86400 and 86400.

Ver también:

addSecs() QDateTime::secsTo()

int QTime::secsTo

(

const QTime &

)

const

bool QTime::setHMS	(	int	h,
		int	m,
		int	s,
		int	ms = 0
	)

Sets the time to hour h, minute m, seconds s and milliseconds ms.

h must be in the range 0..23, m and s must be in the range 0..59, and ms must be in the range 0..999. Returns TRUE if the set time is valid; otherwise returns FALSE.

Ver también:

isValid()

bool QTime::setHMS	(	int	h,
		int	m,
		int	s,
		int	ms = 0
	)

void QTime::start

(

void

)

Sets this time to the current time. This is practical for timing:

    QTime t;
    t.start();
    some_lengthy_task();
    qDebug( "Time elapsed: %d ms", t.elapsed() );

Ver también:

restart(), elapsed(), currentTime()

void QTime::start

(

)

QString QTime::toString

(

const QString &

format

)

const

QString QTime::toString

(

Qt::DateFormat

f = Qt::TextDate

)

const

QString QTime::toString

(

Qt::DateFormat

f = Qt::TextDate

)

const

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Returns the time as a string. Milliseconds are not included. The f parameter determines the format of the string.

If f is Qt::TextDate, the string format is HH:MM:SS; e.g. 1 second before midnight would be "23:59:59".

If f is Qt::ISODate, the string format corresponds to the ISO 8601 extended specification for representations of dates, which is also HH:MM:SS.

If f is Qt::LocalDate, the string format depends on the locale settings of the system.

If the time is an invalid time, then QString::null will be returned.

QString QTime::toString

(

const QString &

format

)

const

Returns the time as a string. The format parameter determines the format of the result string.

These expressions may be used:

Expression Output h the hour without a leading zero (0..23 or 1..12 if AM/PM display) hh the hour with a leading zero (00..23 or 01..12 if AM/PM display) m the minute without a leading zero (0..59) mm the minute with a leading zero (00..59) s the second whithout a leading zero (0..59) ss the second whith a leading zero (00..59) z the milliseconds without leading zeroes (0..999) zzz the milliseconds with leading zeroes (000..999) AP use AM/PM display. AP will be replaced by either "AM" or "PM". ap use am/pm display. ap will be replaced by either "am" or "pm".

All other input characters will be ignored.

Example format strings (assuming that the QTime is 14:13:09.042)

Format Result hh:mm:ss.zzz 14:13:09.042 h:m:s ap 2:13:9 pm

If the time is an invalid time, then QString::null will be returned.

Ver también:

QDate::toString() QDateTime::toString()

---

Documentación de las funciones relacionadas y clases amigas

QDataStream & operator<<	(	QDataStream &	s,
		const QTime &	t
	)		[friend]

Writes time t to the stream s.

Ver también:

Format of the QDataStream operators

Q_EXPORT QDataStream& operator<<	(	QDataStream &	,
		const QTime &
	)		[friend]

Q_EXPORT QDataStream& operator>>	(	QDataStream &	,
		QTime &
	)		[friend]

QDataStream & operator>>	(	QDataStream &	s,
		QTime &	t
	)		[friend]

Reads a time from the stream s into t.

Ver también:

Format of the QDataStream operators

QDateTime [friend]

---

La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/qt/include/qdatetime.h
• src/qt/src/tools/qdatetime.h
• src/qt/src/tools/qdatetime.cpp