The QJsonArray class encapsulates a JSON array. 更多...
| 頭： | #include <QJsonArray> |
| qmake: | QT += core |
| Since: | Qt 5.0 |
注意： 此類的所有函數 可重入 .
| class | const_iterator |
| class | iterator |
| typedef | ConstIterator |
| typedef | Iterator |
| typedef | const_pointer |
| typedef | const_reference |
| typedef | difference_type |
| typedef | pointer |
| typedef | reference |
| typedef | size_type |
| typedef | value_type |
| QJsonArray () | |
| QJsonArray (std::initializer_list<QJsonValue> args ) | |
| QJsonArray (const QJsonArray & other ) | |
| ~QJsonArray () | |
| void | append (const QJsonValue & value ) |
| QJsonValue | at (int i ) const |
| iterator | begin () |
| const_iterator | begin () const |
| const_iterator | constBegin () const |
| const_iterator | constEnd () const |
| bool | contains (const QJsonValue & value ) const |
| int | count () const |
| bool | empty () const |
| iterator | end () |
| const_iterator | end () const |
| iterator | erase (iterator it ) |
| QJsonValue | first () const |
| void | insert (int i , const QJsonValue & value ) |
| iterator | insert (iterator before , const QJsonValue & value ) |
| bool | isEmpty () const |
| QJsonValue | last () const |
| void | pop_back () |
| void | pop_front () |
| void | prepend (const QJsonValue & value ) |
| void | push_back (const QJsonValue & value ) |
| void | push_front (const QJsonValue & value ) |
| void | removeAt (int i ) |
| void | removeFirst () |
| void | removeLast () |
| void | replace (int i , const QJsonValue & value ) |
| int | size () const |
| QJsonValue | takeAt (int i ) |
| QVariantList | toVariantList () const |
| bool | operator!= (const QJsonArray & other ) const |
| QJsonArray | operator+ (const QJsonValue & value ) const |
| QJsonArray & | operator+= (const QJsonValue & value ) |
| QJsonArray & | operator<< (const QJsonValue & value ) |
| QJsonArray & | operator= (const QJsonArray & other ) |
| bool | operator== (const QJsonArray & other ) const |
| QJsonValueRef | operator[] (int i ) |
| QJsonValue | operator[] (int i ) const |
| QJsonArray | fromStringList (const QStringList & list ) |
| QJsonArray | fromVariantList (const QVariantList & list ) |
The QJsonArray class encapsulates a JSON array.
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 ()，和 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 .
另請參閱 在 Qt 中支持 JSON and JSON 保存遊戲範例 .
Qt 樣式同義詞 QJsonArray::const_iterator .
Qt 樣式同義詞 QJsonArray::iterator .
Typedef for const QJsonValue *. Provided for STL compatibility.
Typedef for const QJsonValue &. Provided for STL compatibility.
typedef 對於 int。為兼容 STL 提供。
typedef 對於 QJsonValue *. Provided for STL compatibility.
typedef 對於 QJsonValue &. Provided for STL compatibility.
typedef 對於 int。為兼容 STL 提供。
typedef 對於 QJsonValue . Provided for STL compatibility.
Creates an empty array.
Creates an array initialized from args initialization list.
QJsonArray can be constructed in a way similar to JSON notation, for example:
QJsonArray array = { 1, 2.2, QString() };
該函數在 Qt 5.4 引入。
創建副本為 other .
由於 QJsonArray is implicitly shared, the copy is shallow as long as the object doesn't get modified.
Deletes the array.
插入 value at the end of the array.
返迴 QJsonValue representing the value for index i .
返迴的
QJsonValue
is
未定義
，若
i
is out of bounds.
返迴 STL 樣式迭代器 pointing to the first item in the array.
另請參閱 constBegin () 和 end ().
這是重載函數。
返迴常量 STL 樣式迭代器 pointing to the first item in the array.
返迴常量 STL 樣式迭代器 pointing to the imaginary item after the last item in the array.
另請參閱 constBegin () 和 end ().
返迴
true
if the array contains an occurrence of
value
, otherwise
false
.
另請參閱 count ().
如同 size ().
另請參閱 size ().
此函數為兼容 STL (標準模闆庫) 提供。它相當於
isEmpty
() 並返迴
true
if the array is empty.
返迴 STL 樣式迭代器 pointing to the imaginary item after the last item in the array.
這是重載函數。
Removes the item pointed to by it , and returns an iterator pointing to the next item.
另請參閱 removeAt ().
Returns the first value stored in the array.
如同
at(0)
.
另請參閱 at ().
[static]
QJsonArray
QJsonArray::
fromStringList
(const
QStringList
&
list
)
Converts the string list list 到 QJsonArray .
The values in list will be converted to JSON values.
另請參閱 toVariantList () 和 QJsonValue::fromVariant ().
[static]
QJsonArray
QJsonArray::
fromVariantList
(const
QVariantList
&
list
)
Converts the variant list list 到 QJsonArray .
The QVariant 值在 list will be converted to JSON values.
另請參閱 toVariantList () 和 QJsonValue::fromVariant ().
插入
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.
另請參閱 append (), prepend (), replace ()，和 removeAt ().
插入 value before the position pointed to by before , and returns an iterator pointing to the newly inserted item.
返迴
true
if the object is empty. This is the same as
size
() == 0.
另請參閱 size ().
Returns the last value stored in the array.
如同
at(size() - 1)
.
另請參閱 at ().
此函數為兼容 STL (標準模闆庫) 提供。它相當於 removeLast (). The array must not be empty. If the array can be empty, call isEmpty () before calling this function.
此函數為兼容 STL (標準模闆庫) 提供。它相當於 removeFirst (). The array must not be empty. If the array can be empty, call isEmpty () before calling this function.
插入 value at the beginning of the array.
這如同
insert(0, value)
and will prepend
value
to the array.
此函數為兼容 STL (標準模闆庫) 提供。它相當於 append (value) and will append value to the array.
此函數為兼容 STL (標準模闆庫) 提供。它相當於 prepend (value) and will prepend value to the array.
Removes the value at index position
i
.
i
must be a valid index position in the array (i.e.,
0 <= i < size()
).
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.
另請參閱 removeAt () 和 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.
另請參閱 removeAt () 和 removeFirst ().
替換項在索引位置
i
with
value
.
i
must be a valid index position in the array (i.e.,
0 <= i < size()
).
另請參閱 operator[] () 和 removeAt ().
Returns the number of values stored in the array.
Removes the item at index position
i
並返迴它。
i
must be a valid index position in the array (i.e.,
0 <= i < size()
).
若不使用返迴值， removeAt () 效率更高。
另請參閱 removeAt ().
把此對象轉換成 QVariantList .
返迴創建的映射。
返迴
true
if this array is not equal to
other
.
Returns an array that contains all the items in this array followed by the provided value .
該函數在 Qt 5.3 引入。
另請參閱 operator+= ().
追加 value to the array, and returns a reference to the array itself.
該函數在 Qt 5.3 引入。
另請參閱 append () 和 operator<< ().
追加 value to the array, and returns a reference to the array itself.
該函數在 Qt 5.3 引入。
另請參閱 operator+= () 和 append ().
賦值 other 到此數組。
返迴
true
if this array is equal to
other
.
Returns the value at index position
i
作為可修改引用。
i
must be a valid index position in the array (i.e.,
0 <= i < size()
).
The return value is of type QJsonValueRef , a helper class for QJsonArray and QJsonObject . When you get an object of type QJsonValueRef , you can use it as if it were a reference to a QJsonValue . If you assign to it, the assignment will apply to the character in the QJsonArray of QJsonObject from which you got the reference.
另請參閱 at ().
這是重載函數。
如同 at ().