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qt'QTime (./qt-2.1.0/src/tools/qdatetime.h:93)
class Q_EXPORT QTime
{
public:
QTime() { ds=0; } // set null time
QTime( int h, int m, int s=0, int ms=0 ); // set time
bool isNull() const { return ds == 0; }
bool isValid() const; // valid time
int hour() const; // 0..23
int minute() const; // 0..59
int second() const; // 0..59
int msec() const; // 0..999
QString toString() 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 { return ds == d.ds; }
bool operator!=( const QTime &d ) const { return ds != d.ds; }
bool operator<( const QTime &d ) const { return ds < d.ds; }
bool operator<=( const QTime &d ) const { return ds <= d.ds; }
bool operator>( const QTime &d ) const { return ds > d.ds; }
bool operator>=( const QTime &d ) const { return ds >= d.ds; }
static QTime currentTime();
static bool isValid( int h, int m, int s, int ms=0 );
void start();
int restart();
int elapsed();
private:
static bool currentTime( QTime * );
uint ds;
friend class QDateTime;
friend Q_EXPORT QDataStream &operator<<( QDataStream &, const QTime & );
friend Q_EXPORT QDataStream &operator>>( QDataStream &, QTime & );
};
/*****************************************************************************
QDateTime class
*****************************************************************************/
qt'QTime::QTime() (./qt-2.1.0/src/tools/qdatetime.cpp:605)
QTime::QTime( int h, int m, int s, int ms )
{
setHMS( h, m, s, ms );
}
/*!
\fn bool QTime::isNull() const
Returns TRUE if the time is equal to 00:00:00.000. A null time is valid.
\sa isValid()
*/
/*!
Returns TRUE if the time is valid, or FALSE if the time is invalid.
The time 23:30:55.746 is valid, while 24:12:30 is invalid.
\sa isNull()
*/
qt'QTime::isValid() (./qt-2.1.0/src/tools/qdatetime.cpp:625)
bool QTime::isValid() const
{
return ds < MSECS_PER_DAY;
}
/*!
Returns the hour part (0..23) of the time.
*/
qt'QTime::hour() (./qt-2.1.0/src/tools/qdatetime.cpp:635)
int QTime::hour() const
{
return ds / MSECS_PER_HOUR;
}
/*!
Returns the minute part (0..59) of the time.
*/
qt'QTime::minute() (./qt-2.1.0/src/tools/qdatetime.cpp:644)
int QTime::minute() const
{
return (ds % MSECS_PER_HOUR)/MSECS_PER_MIN;
}
/*!
Returns the second part (0..59) of the time.
*/
qt'QTime::second() (./qt-2.1.0/src/tools/qdatetime.cpp:653)
int QTime::second() const
{
return (ds / 1000)%SECS_PER_MIN;
}
/*!
Returns the millisecond part (0..999) of the time.
*/
qt'QTime::msec() (./qt-2.1.0/src/tools/qdatetime.cpp:662)
int QTime::msec() const
{
return ds % 1000;
}
/*!
Returns the time of this object in a textual format. Milliseconds
are not included. The string format is HH:MM:SS, e.g. 1 second
before midnight would be "23:59:59".
*/
qt'QTime::toString() (./qt-2.1.0/src/tools/qdatetime.cpp:674)
QString QTime::toString() const
{
QString buf;
buf.sprintf( "%.2d:%.2d:%.2d", hour(), minute(), second() );
return buf;
}
/*!
Sets the time to hour \a h, minute \a m, seconds \a s and
milliseconds \a ms.
\a h must be in the range 0-23, \a m and \a s must be in the range
0-59, and \a ms must be in the range 0-999. Returns TRUE if the set
time is valid, otherwise FALSE.
\sa isValid()
*/
qt'QTime::setHMS() (./qt-2.1.0/src/tools/qdatetime.cpp:693)
bool QTime::setHMS( int h, int m, int s, int ms )
{
if ( !isValid(h,m,s,ms) ) {
#if defined(CHECK_RANGE)
qWarning( "QTime::setHMS Invalid time %02d:%02d:%02d.%03d", h, m, s,
ms );
#endif
ds = MSECS_PER_DAY; // make this invalid
return FALSE;
}
ds = (h*SECS_PER_HOUR + m*SECS_PER_MIN + s)*1000 + ms;
return TRUE;
}
/*!
Returns a QTime object containg a time \a nsecs seconds later than
the time of this object (or earlier if \a ms is negative).
Note that the time will wrap if it passes midnight.
Example:
\code
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
\endcode
\sa addMSecs(), secsTo(), QDateTime::addSecs()
*/
qt'QTime::addSecs() (./qt-2.1.0/src/tools/qdatetime.cpp:726)
QTime QTime::addSecs( int nsecs ) const
{
return addMSecs(nsecs*1000);
}
/*!
Returns the number of seconds from this time to \a t (which is
negative if \a t is earlier than this time).
Since QTime measures time within a day and there are 86400 seconds
in a day, the result is between -86400 and 86400.
\sa addSecs() QDateTime::secsTo()
*/
qt'QTime::secsTo() (./qt-2.1.0/src/tools/qdatetime.cpp:741)
int QTime::secsTo( const QTime &t ) const
{
return ((int)t.ds - (int)ds)/1000;
}
/*!
Returns a QTime object containing a time \a ms milliseconds later than
the time of this object (or earlier if \a ms is negative).
Note that the time will wrap if it passes midnight. See addSecs()
for an example.
\sa addSecs(), msecsTo()
*/
qt'QTime::addMSecs() (./qt-2.1.0/src/tools/qdatetime.cpp:756)
QTime QTime::addMSecs( int ms ) const
{
QTime t;
if ( ms < 0 ) {
// % not well-defined for -ve, but / is.
int negdays = (MSECS_PER_DAY-ms) / MSECS_PER_DAY;
t.ds = ((int)ds + ms + negdays*MSECS_PER_DAY)
% MSECS_PER_DAY;
} else {
t.ds = ((int)ds + ms) % MSECS_PER_DAY;
}
return t;
}
/*!
Returns the number of milliseconds from this time to \a t (which is
negative if \a t is earlier than this time).
Since QTime measures time within a day and there are 86400000
milliseconds in a day, the result is between -86400000 and 86400000.
\sa secsTo()
*/
qt'QTime::msecsTo() (./qt-2.1.0/src/tools/qdatetime.cpp:780)
int QTime::msecsTo( const QTime &t ) const
{
return (int)t.ds - (int)ds;
}
/*!
\fn bool QTime::operator==( const QTime &t ) const
Returns TRUE if this time is equal to \a t, or FALSE if they are
different.
*/
/*!
\fn bool QTime::operator!=( const QTime &t ) const
Returns TRUE if this time is different from \a t, or FALSE if they
are equal.
*/
/*!
\fn bool QTime::operator<( const QTime &t ) const
Returns TRUE if this time is earlier than \a t, otherwise FALSE.
*/
/*!
\fn bool QTime::operator<=( const QTime &t ) const
Returns TRUE if this time is earlier than or equal to \a t,
otherwise FALSE.
*/
/*!
\fn bool QTime::operator>( const QTime &t ) const
Returns TRUE if this time is later than \a t, otherwise FALSE.
*/
/*!
\fn bool QTime::operator>=( const QTime &t ) const
Returns TRUE if this time is later than or equal to \a t, otherwise
FALSE.
*/
/*!
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.
*/
qt'QTime::currentTime() (./qt-2.1.0/src/tools/qdatetime.cpp:835)
QTime QTime::currentTime()
{
QTime ct;
currentTime( &ct );
return ct;
}
/*!
\internal
Fetches the current time and returns TRUE if the time is within one
minute after midnight, otherwise FALSE. The return value is used by
QDateTime::currentDateTime() to ensure that the date there is correct.
*/
qt'QTime::currentTime() (./qt-2.1.0/src/tools/qdatetime.cpp:850)
bool QTime::currentTime( QTime *ct )
{
if ( !ct ) {
#if defined(CHECK_NULL)
qWarning( "QTime::currentTime(QTime *): Null pointer not allowed" );
#endif
return FALSE;
}
#if defined(_OS_WIN32_)
SYSTEMTIME t;
GetLocalTime( &t );
ct->ds = MSECS_PER_HOUR*t.wHour + MSECS_PER_MIN*t.wMinute +
1000*t.wSecond + t.wMilliseconds;
return (t.wHour == 0 && t.wMinute == 0);
#elif defined(_OS_OS2_)
DATETIME t;
DosGetDateTime( &t );
ct->ds = MSECS_PER_HOUR*t.hours + MSECS_PER_MIN*t.minutes +
1000*t.seconds + 10*t.hundredths;
return (t.hours == 0 && t.minutes == 0);
#elif defined(_OS_MSDOS_)
_dostime_t t;
_dos_gettime( &t );
ct->ds = MSECS_PER_HOUR*t.hour + MSECS_PER_MIN*t.minute +
t.second*1000 + t.hsecond*10;
return (t.hour== 0 && t.minute == 0);
#elif defined(UNIX)
struct timeval tv;
gettimeofday( &tv, 0 );
time_t ltime = tv.tv_sec;
tm *t = localtime( <ime );
ct->ds = (uint)( MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +
1000*t->tm_sec + tv.tv_usec/1000 );
return (t->tm_hour== 0 && t->tm_min == 0);
#else
time_t ltime; // no millisecond resolution!!
::time( <ime );
tm *t = localtime( <ime );
ct->ds = MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +
1000*t->tm_sec;
return (t->tm_hour== 0 && t->tm_min == 0);
#endif
}
/*!
Returns TRUE if the specified time is valid, otherwise FALSE.
The time is valid if \a h is in the range 0-23, \a m and \a s are in
the range 0-59, and \a ms is in the range 0-999.
Example:
\code
QTime::isValid(21, 10, 30); // returns TRUE
QTime::isValid(22, 5, 62); // returns FALSE
\endcode
*/
qt'QTime::isValid() (./qt-2.1.0/src/tools/qdatetime.cpp:917)
bool QTime::isValid( int h, int m, int s, int ms )
{
return (uint)h < 24 && (uint)m < 60 && (uint)s < 60 && (uint)ms < 1000;
}
/*!
Sets this time to the current time. This is practical for timing:
\code
QTime t;
t.start(); // start clock
... // some lengthy task
qDebug( "%d\n", t.elapsed() ); // prints # msecs elapsed
\endcode
\sa restart(), elapsed(), currentTime()
*/
qt'QTime::start() (./qt-2.1.0/src/tools/qdatetime.cpp:936)
void QTime::start()
{
*this = currentTime();
}
/*!
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,
then restart() for each later measurement.
Note that the counter wraps to zero 24 hours after the last call to
start() or restart().
\warning 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 e.g. when daylight saving is turned on or off.
\sa start(), elapsed(), currentTime()
*/
qt'QTime::restart() (./qt-2.1.0/src/tools/qdatetime.cpp:960)
int QTime::restart()
{
QTime t = currentTime();
int n = msecsTo( t );
if ( n < 0 ) // passed midnight
n += 86400*1000;
*this = t;
return n;
}
/*!
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.
\warning 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 e.g. when daylight saving is turned on or off.
\sa start(), restart()
*/
qt'QTime::elapsed() (./qt-2.1.0/src/tools/qdatetime.cpp:987)
int QTime::elapsed()
{
int n = msecsTo( currentTime() );
if ( n < 0 ) // passed midnight
n += 86400*1000;
return n;
}
/*****************************************************************************
QDateTime member functions
*****************************************************************************/
/*!
\class QDateTime qdatetime.h
\brief The QDateTime class provides date and time functions.
\ingroup time
A QDateTime object contains a calendar date and a clock time (a
"datetime"). It is a combination of the QDate and QTime classes. It
can read the current datetime from the system clock. It provides
functions for comparing datetimes and for manipulating a datetime by
adding a number of seconds or days.
A QDateTime object is typically created either by giving a date and
time explicitly, or by using the static function currentTime(),
which makes a QDateTime object which contains the system's clock
time.
The date() and time() functions provide access to the date and time
parts of the datetime. The same information is provided in textual
format by the toString() function.
QDateTime provides a full set of operators to compare two QDateTime
objects. A datetime is considered smaller than another if it is
earlier than the other.
The datetime a given number of days or seconds later than a given
datetime can be found using the addDays() and addSecs()
functions. Correspondingly, the number of days or seconds between
two times can be found using the daysTo() or secsTo() functions.
A datetime can also be set using the setTime_t() function, which
takes a POSIX-standard "number of seconds since 00:00:00 on January
1, 1970" value.
The limitations regarding range and resolution mentioned in the
QDate and QTime documentation apply for QDateTime also.
\sa QDate, QTime
*/
/*!
\fn QDateTime::QDateTime()
Constructs a null datetime (i.e. null date and null time). A null
datetime is invalid, since the date is invalid.
\sa isValid()
*/
/*!
Constructs a datetime with date \a date and null time (00:00:00.000).
*/