class QJsonArray¶

The QJsonArray class encapsulates a JSON array. More…

Synopsis¶

Methods¶

def __init__()
def append()
def at()
def contains()
def count()
def empty()
def first()
def insert()
def isEmpty()
def last()
def __ne__()
def __add__()
def __iadd__()
def __lshift__()
def __eq__()
def operator[]()
def pop_back()
def pop_front()
def prepend()
def push_back()
def push_front()
def removeAt()
def removeFirst()
def removeLast()
def replace()
def size()
def swap()
def takeAt()
def toVariantList()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description¶

A JSON array is a list of values. The list can be manipulated by inserting and removing QJsonValue ‘s from the array.

A QJsonArray can be converted to and from a QVariantList . You can query the number of entries with size() , insert() , and removeAt() entries from it and iterate over its content using the standard C++ iterator pattern.

QJsonArray is an implicitly shared class and shares the data with the document it has been created from as long as it is not being modified.

You can convert the array to and from text based JSON through QJsonDocument .

See also

JSON Support in Qt Saving and Loading a Game

__init__()¶

Creates an empty array.

__init__(other)

Parameters:: other – QJsonArray

Creates a copy of other.

Since QJsonArray is implicitly shared, the copy is shallow as long as the object doesn’t get modified.

append(value)¶

Parameters:: value – QJsonValue

Inserts value at the end of the array.

See also

prepend() insert()

at(i)¶

Parameters:: i – int
Return type:: QJsonValue

Returns a QJsonValue representing the value for index i.

The returned QJsonValue is Undefined, if i is out of bounds.

contains(element)¶

Parameters:: element – QJsonValue
Return type:: bool

Returns true if the array contains an occurrence of value, otherwise false.

See also

count()

count()¶

Return type:: int

Same as size() .

See also

size()

empty()¶

Return type:: bool

This function is provided for STL compatibility. It is equivalent to isEmpty() and returns true if the array is empty.

first()¶

Return type:: QJsonValue

Returns the first value stored in the array.

Same as at(0).

See also

at()

static fromStringList(list)¶

Parameters:: list – list of strings
Return type:: QJsonArray

Converts the string list list to a QJsonArray .

The values in list will be converted to JSON values.

See also

toVariantList() fromVariant()

static fromVariantList(list)¶

Parameters:: list – .list of QVariant
Return type:: QJsonArray

Converts the variant list list to a QJsonArray .

The QVariant values in list will be converted to JSON values.

Note

Conversion from QVariant is not completely lossless. Please see the documentation in fromVariant() for more information.

See also

toVariantList() fromVariant()

insert(i, value)¶

Parameters:

i – int
value – QJsonValue

Inserts value at index position i in the array. If i is 0, the value is prepended to the array. If i is size() , the value is appended to the array.

See also

append() prepend() replace() removeAt()

isEmpty()¶

Return type:: bool

Returns true if the object is empty. This is the same as size() == 0.

See also

size()

last()¶

Return type:: QJsonValue

Returns the last value stored in the array.

Same as at(size() - 1).

See also

at()

__ne__(rhs)¶

Parameters:: rhs – QJsonArray
Return type:: bool

Returns true if lhs array is not equal to rhs, false otherwise.

__ne__(rhs)

Parameters:: rhs – QJsonValue
Return type:: bool

__add__(v)¶

Parameters:: v – QJsonValue
Return type:: QJsonArray

Returns an array that contains all the items in this array followed by the provided value.

See also

operator+=()

__iadd__(v)¶

Parameters:: v – QJsonValue
Return type:: QJsonArray

Appends value to the array, and returns a reference to the array itself.

See also

append() operator

__lshift__(v)¶

Parameters:: v – QJsonValue
Return type:: QJsonArray

Appends value to the array, and returns a reference to the array itself.

See also

operator+=() append()

__eq__(rhs)¶

Parameters:: rhs – QJsonArray
Return type:: bool

Returns true if lhs array is equal to rhs, false otherwise.

__eq__(rhs)

Parameters:: rhs – QJsonValue
Return type:: bool

operator(i)¶

Parameters:: i – int
Return type:: QJsonValue

This is an overloaded function.

Same as at() .

pop_back()¶

This function is provided for STL compatibility. It is equivalent to removeLast() . The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

pop_front()¶

This function is provided for STL compatibility. It is equivalent to removeFirst() . The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

prepend(value)¶

Parameters:: value – QJsonValue

Inserts value at the beginning of the array.

This is the same as insert(0, value) and will prepend value to the array.

See also

append() insert()

push_back(t)¶

Parameters:: t – QJsonValue

This function is provided for STL compatibility. It is equivalent to append(value) and will append value to the array.

push_front(t)¶

Parameters:: t – QJsonValue

This function is provided for STL compatibility. It is equivalent to prepend(value) and will prepend value to the array.

removeAt(i)¶

Parameters:: i – int

Removes the value at index position i. i must be a valid index position in the array (i.e., 0 <= i < size()).

See also

insert() replace()

removeFirst()¶

Removes the first item in the array. Calling this function is equivalent to calling removeAt(0). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

See also

removeAt() removeLast()

removeLast()¶

Removes the last item in the array. Calling this function is equivalent to calling removeAt(size() - 1). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

See also

removeAt() removeFirst()

replace(i, value)¶

Parameters:

i – int
value – QJsonValue

Replaces the item at index position i with value. i must be a valid index position in the array (i.e., 0 <= i < size()).

See also

operator[]() removeAt()

size()¶

Return type:: int

Returns the number of values stored in the array.

swap(other)¶

Parameters:: other – QJsonArray

Swaps the array other with this. This operation is very fast and never fails.

takeAt(i)¶

Parameters:: i – int
Return type:: QJsonValue

Removes the item at index position i and returns it. i must be a valid index position in the array (i.e., 0 <= i < size()).

If you don’t use the return value, removeAt() is more efficient.

See also

removeAt()

toVariantList()¶

Return type:: .list of QVariant

Converts this object to a QVariantList .

Returns the created map.