QUuid(3qt)QUuid(3qt)NAMEQUuid - Defines a Universally Unique Identifier (UUID)
SYNOPSIS
All the functions in this class are reentrant when Qt is built with
thread support.</p>
#include <quuid.h>
Public Members
enum Variant { VarUnknown = -1, NCS = 0, DCE = 2, Microsoft = 6,
Reserved = 7 }
enum Version { VerUnknown = -1, Time = 1, EmbeddedPOSIX = 2, Name = 3,
Random = 4 }
QUuid ()
QUuid ( uint l, ushort w1, ushort w2, uchar b1, uchar b2, uchar b3,
uchar b4, uchar b5, uchar b6, uchar b7, uchar b8 )
QUuid ( const QUuid & orig )
QUuid ( const QString & text )
QString toString () const
operator QString () const
bool isNull () const
QUuid & operator= ( const QUuid & uuid )
bool operator== ( const QUuid & other ) const
bool operator!= ( const QUuid & other ) const
bool operator< ( const QUuid & other ) const
bool operator> ( const QUuid & other ) const
QUuid::Variant variant () const
QUuid::Version version () const
Static Public Members
QUuid createUuid ()
RELATED FUNCTION DOCUMENTATION
QDataStream & operator<< ( QDataStream & s, const QUuid & id )
QDataStream & operator>> ( QDataStream & s, QUuid & id )
DESCRIPTION
The QUuid class defines a Universally Unique Identifier (UUID).
For objects or declarations that must be uniquely identified, UUIDs
(also known as GUIDs) are widely used in order to assign a fixed and
easy to compare value to the object or declaration. The 128-bit value
of a UUID is generated by an algorithm that guarantees that the value
is unique.
In Qt, UUIDs are wrapped by the QUuid struct which provides convenience
functions for handling UUIDs. Most platforms provide a tool to generate
new UUIDs, for example, uuidgen and guidgen.
UUIDs generated by QUuid, are based on the Random version of the DCE
(Distributed Computing Environment) standard.
UUIDs can be constructed from numeric values or from strings, or using
the static createUuid() function. They can be converted to a string
with toString(). UUIDs have a variant() and a version(), and null UUIDs
return TRUE from isNull().
Member Type Documentation
QUuid::Variant
This enum defines the variant of the UUID, which is the scheme which
defines the layout of the 128-bits value.
QUuid::VarUnknown - Variant is unknown
QUuid::NCS - Reserved for NCS (Network Computing System) backward
compatibility
QUuid::DCE - Distributed Computing Environment, the scheme used by
QUuid
QUuid::Microsoft - Reserved for Microsoft backward compatibility (GUID)
QUuid::Reserved - Reserved for future definition
QUuid::Version
This enum defines the version of the UUID.
QUuid::VerUnknown - Version is unknown
QUuid::Time - Time-based, by using timestamp, clock sequence, and MAC
network card address (if available) for the node sections
QUuid::EmbeddedPOSIX - DCE Security version, with embedded POSIX UUIDs
QUuid::Name - Name-based, by using values from a name for all sections
QUuid::Random - Random-based, by using random numbers for all sections
MEMBER FUNCTION DOCUMENTATIONQUuid::QUuid ()
Creates the null UUID {00000000-0000-0000-0000-000000000000}.
QUuid::QUuid ( uint l, ushort w1, ushort w2, uchar b1, uchar b2, uchar b3,
uchar b4, uchar b5, uchar b6, uchar b7, uchar b8 )
Creates a UUID with the value specified by the parameters, l, w1, w2,
b1, b2, b3, b4, b5, b6, b7, b8.
Example:
// {67C8770B-44F1-410A-AB9A-F9B5446F13EE}
QUuid IID_MyInterface( 0x67c8770b, 0x44f1, 0x410a, 0xab, 0x9a, 0xf9, 0xb5, 0x44, 0x6f, 0x13, 0xee )
QUuid::QUuid ( const QUuid & orig )
Creates a copy of the QUuid orig.
QUuid::QUuid ( const QString & text )
Creates a QUuid object from the string text. The function can only
convert a string in the format {HHHHHHHH-HHHH-HHHH-HHHH-HHHHHHHHHHHH}
(where 'H' stands for a hex digit). If the conversion fails a null UUID
is created.
QUuid QUuid::createUuid () [static]
Returns a new UUID of DCE variant, and Random type. The UUIDs generated
are based on the platform specific pseudo-random generator, which is
usually not a cryptographic-quality random number generator. Therefore,
a UUID is not guaranteed to be unique cross application instances.
On Windows, the new UUID is extremely likely to be unique on the same
or any other system, networked or not.
See also variant() and version().
bool QUuid::isNull () const
Returns TRUE if this is the null UUID
{00000000-0000-0000-0000-000000000000}; otherwise returns FALSE.
QUuid::operator QString () const
Returns the string representation of the uuid.
See also toString().
bool QUuid::operator!= ( const QUuid & other ) const
Returns TRUE if this QUuid and the other QUuid are different; otherwise
returns FALSE.
bool QUuid::operator<; ( const QUuid & other ) const
Returns TRUE if this QUuid is of the same variant, and
lexicographically before the other QUuid; otherwise returns FALSE.
See also variant().
QUuid & QUuid::operator= ( const QUuid & uuid )
Assigns the value of uuid to this QUuid object.
bool QUuid::operator== ( const QUuid & other ) const
Returns TRUE if this QUuid and the other QUuid are identical; otherwise
returns FALSE.
bool QUuid::operator> ( const QUuid & other ) const
Returns TRUE if this QUuid is of the same variant, and
lexicographically after the other QUuid; otherwise returns FALSE.
See also variant().
QString QUuid::toString () const
QString QUuid::toString() const
Returns the string representation of the uuid.
QUuid::Variant QUuid::variant () const
Returns the variant of the UUID. The null UUID is considered to be of
an unknown variant.
See also version().
QUuid::Version QUuid::version () const
Returns the version of the UUID, if the UUID is of the DCE variant;
otherwise returns VerUnknown.
See also variant().
RELATED FUNCTION DOCUMENTATIONQDataStream & operator<;< ( QDataStream & s, const QUuid & id )
Writes the uuid id to the datastream s.
QDataStream & operator>> ( QDataStream & s, QUuid & id )
Reads uuid from from the stream s into id.
SEE ALSO
http://doc.trolltech.com/quuid.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports help us to
help you. Thank you.
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with a
web browser. This man page is provided as a convenience for those users
who prefer man pages, although this format is not officially supported
by Trolltech.
If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(quuid.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QUuid(3qt)
