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# QUuid Class Reference

The QUuid class defines a Universally Unique Identifier (UUID). More...

All the functions in this class are reentrant when Qt is built with thread support.

`#include <quuid.h>`

List of all member functions.

## Public Members

- 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

## Related Functions

- QDataStream & operator<< ( QDataStream & s, const QUuid & id )
- QDataStream & operator>> ( QDataStream & s, QUuid & id )

## Detailed Description

The QUuid class defines a Universally Unique Identifier (UUID).

For objects or declarations that need to 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.

## Member Function Documentation

### QUuid::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), and will create the null UUID if the conversion fails.

### 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.

### 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.

### QString QUuid::toString () const

QString QUuid::toString() const

Returns the string representation of the uuid.

## Related Functions

### QDataStream & 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.

This file is part of the Qt toolkit. Copyright © 1995-2003 Trolltech. All Rights Reserved.