The prototype for the ByteArray class. More...

#include <bytearrayprototype.h>

Inherits QObject, and QScriptable.

Public Slots
void	chop (int n)
	Removes n bytes from the end of the byte array.

void	truncate (int pos)
	Truncates the array at pos.

bool	equals (const QByteArray &other)
	Returns true if this ByteArray is equal to other.

QByteArray	left (int len) const
	Returns a ByteArray with the len leftmost bytes.

QByteArray	mid (int pos, int len=-1) const
	Returns the middle part of the array from pos with length len.

QScriptValue	remove (int pos, int len)
	Removes len bytes starting at pos.

QByteArray	right (int len) const
	Returns the rightmost len bytes.

QString	toLatin1String () const
	Convert to a String.

QScriptValue	valueOf () const
	Return the data stored by the object.

Functions for reading numbers in binary form out of a ByteArray.
Similar to functions in node.js Buffer class. It is assumed that the number to be read is written in binary representation in the ByteArray. The functions access the buffer bytes and convert to the corresponding numeric value. The functions support double (64bit), float(32bit), int (32bit, 16bit, signed and unsigned) and the 8bit signed int. The unsigned 8bit value is the native storage type of the class and can be read with the [] operator. Little- and big-endian number formats (LE or BE in the function name) are supported. An offset in bytes may be passed as an argument. It defines the index of the byte where the stored number starts. If not given it defaults to 0. If the read operation exeeds the buffer length a RangeError is thrown in the QScriptEngine.
double	readDoubleLE (int offset=0) const

double	readDoubleBE (int offset=0) const

float	readFloatLE (int offset=0) const

float	readFloatBE (int offset=0) const

int	readInt32LE (int offset=0) const

int	readInt32BE (int offset=0) const

uint	readUInt32LE (int offset=0) const

uint	readUInt32BE (int offset=0) const

int	readInt16LE (int offset=0) const

int	readInt16BE (int offset=0) const

uint	readUInt16LE (int offset=0) const

uint	readUInt16BE (int offset=0) const

int	readInt8 (int offset=0) const

Functions for writing numbers in binary format into the ByteArray
Similar to functions in node.js Buffer class. The number passed as a 1st argument is written in binary representation in the ByteArray. The functions support double (64bit), float(32bit), int (32bit, 16bit, signed and unsigned) and the 8bit signed int. The unsigned 8bit value is the native storage type of the class and can be written using the [] operator. Little- and big-endian number formats (LE or BE in the function name) are supported. An offset in bytes may be given as an argument. It defines the index of the starting byte where the number is stored. If the write operation exeeds the buffer length a RangeError is thrown in the QScriptEngine.
void	writeDoubleLE (double v, int offset=0)

void	writeDoubleBE (double v, int offset=0)

void	writeFloatLE (float v, int offset=0)

void	writeFloatBE (float v, int offset=0)

void	writeInt32LE (int v, int offset=0)

void	writeInt32BE (int v, int offset=0)

void	writeUInt32LE (uint v, int offset=0)

void	writeUInt32BE (uint v, int offset=0)

void	writeInt16LE (int v, int offset=0)

void	writeInt16BE (int v, int offset=0)

void	writeUInt16LE (uint v, int offset=0)

void	writeUInt16BE (uint v, int offset=0)

void	writeInt8 (int v, int offset=0)

Detailed Description

The prototype for the ByteArray class.

The ByteArray javascript class represents an array of bytes. It is essentially a QtScript wrapper for the QByteArray C++ class. Thus, when Qt-slots of QDaq classes are called from QtScript code, a QByteArray passed as an argument or as return value is converted to a JS object of ByteArray class.

Elements of a ByteArray can be accesed by the [] operator and the "length" property gives the number of elements.

A ByteArray can be created in QDaq scripts by the new operator in 3 possible ways:

var b1 = new ByteArray(10); // An empty ByteArray of length 10
var b2 = new ByteArray("abcdef"); // A ByteArray from a string
var b3 = new ByteArray(b2); // b3 is a copy of b2
b2[3] // returns ASCII code of character 'c'
b3.length // returns 6

The ByteArrayPrototype class defines a number of usefull functions for handling ByteArray objects in script code.

Definition at line 37 of file bytearrayprototype.h.

The documentation for this class was generated from the following files:

/home/george/Dev/rtlab/qdaq/lib/core/bytearrayprototype.h
/home/george/Dev/rtlab/qdaq/lib/core/bytearrayprototype.cpp

Public Slots

Detailed Description