. See the QArray
documentation for further information.
Member Function Documentation
QByteArray::QByteArray ()
Constructs a null array.
See also isNull().
QByteArray::QByteArray ( const QByteArray & a )
Constructs a shallow copy of a.
See also assign().
QByteArray::QByteArray ( int size )
Constructs an array with room for size elements.
Makes a null array if size == 0.
Note that the elements are not initialized.
See also resize() and isNull().
QByteArray::QByteArray ( int, int ) [protected]
Constructs an array without allocating array space.
The arguments should be (0, 0). Use at own risk.
QByteArray::~QByteArray ()
Dereferences the array data and deletes it if this was the last
reference.
QByteArray::operator const char * () const
Cast operator. Returns a pointer to the array.
See also data().
QByteArray & QByteArray::assign ( const QByteArray & a )
Shallow copy. Dereferences the current array and references the data
contained in a instead. Returns a reference to this array.
See also operator=().
QByteArray & QByteArray::assign ( const char * data, uint size )
Shallow copy. Dereferences the current array and references the
array data data, which contains size elements.
Returns a reference to this array.
Do not delete data later, QArray takes care of that.
char & QByteArray::at ( uint index ) const
Returns a reference to the element at position index in the array.
This can be used to both read and set an element.
See also operator[]().
ConstIterator QByteArray::begin () const
Returns a const iterator pointing at the beginning of this array.
This iterator can be used as the iterators of QValueList and QMap
for example. In fact it does not only behave like a usual pointer:
It is a pointer.
Iterator QByteArray::begin ()
Returns an iterator pointing at the beginning of this array.
This iterator can be used as the iterators of QValueList and QMap
for example. In fact it does not only behave like a usual pointer:
It is a pointer.
int QByteArray::bsearch ( const char & v ) const
In a sorted array, finds the first occurrence of v using binary
search. For a sorted array, this is generally much faster than
find(), which does a linear search.
Returns the position of v, or -1 if v could not be found.
See also sort() and find().
int QByteArray::contains ( const char & v ) const
Returns the number of times v occurs in the array.
See also find().
QByteArray QByteArray::copy () const
Returns a deep copy of this array.
See also detach() and duplicate().
uint QByteArray::count () const
Returns the same as size().
See also size().
char * QByteArray::data () const
Returns a pointer to the actual array data.
The array is a null array if data() == 0 (null pointer).
See also isNull().
void QByteArray::detach () [virtual]
Detaches this array from shared array data, i.e. makes a private, deep
copy of the data.
Copying will only be performed if the
reference count is greater than one.
See also copy().
Reimplemented from QGArray.
QByteArray & QByteArray::duplicate ( const QByteArray & a )
Deep copy. Dereferences the current array and obtains a copy of the data
contained in a instead. Returns a reference to this array.
See also copy().
QByteArray & QByteArray::duplicate ( const char * data, uint size )
Deep copy. Dereferences the current array and obtains a copy of the
array data data instead. Returns a reference to this array.
See also copy().
ConstIterator QByteArray::end () const
Returns a const iterator pointing behind the last element of this array.
This iterator can be used as the iterators of QValueList and QMap
for example. In fact it does not only behave like a usual pointer:
It is a pointer.
Iterator QByteArray::end ()
Returns an iterator pointing behind the last element of this array.
This iterator can be used as the iterators of QValueList and QMap
for example. In fact it does not only behave like a usual pointer:
It is a pointer.
bool QByteArray::fill ( const char & v, int size = -1 )
Fills the array with the value v. If size is specified as different
from -1, then the array will be resized before filled.
Returns TRUE if successful, or FALSE if the memory cannot be allocated
(only when size != -1).
See also resize().
int QByteArray::find ( const char & v, uint index=0 ) const
Finds the first occurrence of v, starting at position index.
Returns the position of v, or -1 if v could not be found.
See also contains().
bool QByteArray::isEmpty () const
Returns TRUE if the array is empty, i.e. size() == 0, otherwise FALSE.
isEmpty() is equivalent with isNull() for QArray. Note that this is not
the case for QCString::isEmpty().
bool QByteArray::isNull () const
Returns TRUE if the array is null, otherwise FALSE.
A null array has size() == 0 and data() == 0.
uint QByteArray::nrefs () const
Returns the reference count for the shared array data. This reference count
is always greater than zero.
bool QByteArray::operator!= ( const QByteArray & a ) const
Returns TRUE if this array is different from a, otherwise FALSE.
The two arrays are bitwise compared.
See also operator==().
QByteArray & QByteArray::operator= ( const QByteArray & a )
Assigns a shallow copy of a to this array and returns a reference
to this array.
Equivalent to assign( a ).
bool QByteArray::operator== ( const QByteArray & a ) const
Returns TRUE if this array is equal to a, otherwise FALSE.
The two arrays are bitwise compared.
See also operator!=().
char & QByteArray::operator[] ( int index ) const
Returns a reference to the element at position index in the array.
This can be used to both read and set an element. Equivalent to at().
See also at().
void QByteArray::resetRawData ( const char * data, uint size )
Resets raw data that was set using setRawData().
The arguments must be the data and length that were passed to
setRawData(). This is for consistency checking.
See also setRawData().
bool QByteArray::resize ( uint size )
Resizes (expands or shrinks) the array to size elements. The array
becomes a null array if size == 0.
Returns TRUE if successful, or FALSE if the memory cannot be allocated.
New elements will not be initialized.
See also size().
QByteArray & QByteArray::setRawData ( const char * data, uint size )
Sets raw data and returns a reference to the array.
Dereferences the current array and sets the new array data to data and
the new array size to size. Do not attempt to resize or re-assign the
array data when raw data has been set.
Call resetRawData(d,len) to reset the array.
Setting raw data is useful because it sets QArray data without allocating
memory or copying data.
Example I (intended use):
static char bindata[] = { 231, 1, 44, ... };
QByteArray a;
a.setRawData( bindata, sizeof(bindata) ); // a points to bindata
QDataStream s( a, IO_ReadOnly ); // open on a's data
s >> <something>; // read raw bindata
a.resetRawData( bindata, sizeof(bindata) ); // finished
Example II (you don't want to do this):
static char bindata[] = { 231, 1, 44, ... };
QByteArray a, b;
a.setRawData( bindata, sizeof(bindata) ); // a points to bindata
a.resize( 8 ); // will crash
b = a; // will crash
a[2] = 123; // might crash
// forget to resetRawData - will crash
Warning: If you do not call resetRawData(), QArray will attempt to
deallocate or reallocate the raw data, which might not be too good.
Be careful.
See also resetRawData().
uint QByteArray::size () const
Returns the size of the array (max number of elements).
The array is a null array if size() == 0.
See also isNull() and resize().
void QByteArray::sort ()
Sorts the array elements in ascending order, using bitwise
comparison (memcmp()).
See also bsearch().
bool QByteArray::truncate ( uint pos )
Truncates the array at position pos.
Returns TRUE if successful, or FALSE if the memory cannot be allocated.
Equivalent to resize(pos).
See also resize().
Related Functions
Reads a byte array from a stream and returns a reference to the stream.
See also Format of the QDataStream operators
Writes a byte array to a stream and returns a reference to the stream.
See also Format of the QDataStream operators
Q_UINT16 qChecksum (const char * data, uint len)
Returns the CRC-16 checksum of len bytes starting at data.
The checksum is independent of the byte order (endianness).
Search the documentation, FAQ, qt-interest archive and more (uses
www.trolltech.com):
This file is part of the Qt toolkit,
copyright © 1995-2005
Trolltech, all rights reserved.
