内容

• 公共类型
• 公共函数
• 静态公共成员
• 详细描述

QJsonArray 类

QJsonArray 类封装 JSON 数组。 更多...

头：	#include <QJsonArray>
CMake:	find_package(Qt6 COMPONENTS Core REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core
Since:	Qt 5.0

• 所有成员列表，包括继承成员

注意： 此类的所有函数 可重入 .

公共类型

class	const_iterator
class	iterator
	ConstIterator
	Iterator
	const_pointer
	const_reference
	difference_type
	pointer
	reference
	size_type
	value_type

公共函数

	QJsonArray (QJsonArray && other )
	QJsonArray (const QJsonArray & other )
	QJsonArray (std::initializer_list<QJsonValue> args )
	QJsonArray ()
QJsonArray &	operator= (QJsonArray && other )
QJsonArray &	operator= (const QJsonArray & other )
	~QJsonArray ()
void	append (const QJsonValue & value )
QJsonValue	at (qsizetype i ) const
QJsonArray::iterator	begin ()
QJsonArray::const_iterator	begin () const
QJsonArray::const_iterator	cbegin () const
QJsonArray::const_iterator	cend () const
QJsonArray::const_iterator	constBegin () const
QJsonArray::const_iterator	constEnd () const
bool	contains (const QJsonValue & value ) const
qsizetype	count () const
bool	empty () const
QJsonArray::iterator	end ()
QJsonArray::const_iterator	end () const
QJsonArray::iterator	erase (QJsonArray::iterator it )
QJsonValue	first () const
void	insert (qsizetype i , const QJsonValue & value )
QJsonArray::iterator	insert (QJsonArray::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 (qsizetype i )
void	removeFirst ()
void	removeLast ()
void	replace (qsizetype i , const QJsonValue & value )
qsizetype	size () const
void	swap (QJsonArray & other )
QJsonValue	takeAt (qsizetype 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 )
bool	operator== (const QJsonArray & other ) const
QJsonValueRef	operator[] (qsizetype i )
QJsonValue	operator[] (qsizetype i ) const

静态公共成员

QJsonArray	fromStringList (const QStringList & list )
QJsonArray	fromVariantList (const QVariantList & list )

详细描述

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 .

另请参阅 在 Qt 中支持 JSON and JSON 保存游戏范例 .

成员类型文档编制

QJsonArray:: ConstIterator

Qt 样式同义词 QJsonArray::const_iterator .

QJsonArray:: Iterator

Qt 样式同义词 QJsonArray::iterator .

QJsonArray:: const_pointer

Typedef for const QJsonValue *. Provided for STL compatibility.

QJsonArray:: const_reference

Typedef for const QJsonValue &. Provided for STL compatibility.

QJsonArray:: difference_type

Typedef for qsizetype. Provided for STL compatibility.

QJsonArray:: pointer

typedef 对于 QJsonValue *. Provided for STL compatibility.

QJsonArray:: reference

typedef 对于 QJsonValue &. Provided for STL compatibility.

QJsonArray:: size_type

Typedef for qsizetype. Provided for STL compatibility.

QJsonArray:: value_type

typedef 对于 QJsonValue . Provided for STL compatibility.

成员函数文档编制

[since 5.10] QJsonArray:: QJsonArray ( QJsonArray && other )

Move-constructs a QJsonArray from other .

该函数在 Qt 5.10 引入。

QJsonArray:: QJsonArray (const QJsonArray & other )

创建副本为 other .

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

[since 5.4] QJsonArray:: QJsonArray ( std::initializer_list < QJsonValue > args )

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() };
					

该函数在 Qt 5.4 引入。

QJsonArray:: QJsonArray ()

Creates an empty array.

[since 5.10] QJsonArray &QJsonArray:: operator= ( QJsonArray && other )

移动赋值 other 到此数组。

该函数在 Qt 5.10 引入。

QJsonArray &QJsonArray:: operator= (const QJsonArray & other )

赋值 other 到此数组。

QJsonArray:: ~QJsonArray ()

Deletes the array.

void QJsonArray:: append (const QJsonValue & value )

插入 value at the end of the array.

另请参阅 prepend () 和 insert ().

QJsonValue QJsonArray:: at ( qsizetype i ) const

返回 QJsonValue representing the value for index i .

返回的 QJsonValue is Undefined ，若 i is out of bounds.

QJsonArray::iterator QJsonArray:: begin ()

返回 STL 样式迭代器 pointing to the first item in the array.

另请参阅 constBegin () 和 end ().

QJsonArray::const_iterator QJsonArray:: begin () const

这是重载函数。

QJsonArray::const_iterator QJsonArray:: cbegin () const

返回常量 STL 样式迭代器 pointing to the first item in the array.

另请参阅 begin () 和 cend ().

QJsonArray::const_iterator QJsonArray:: cend () const

返回常量 STL 样式迭代器 pointing to the imaginary item after the last item in the array.

另请参阅 cbegin () 和 end ().

QJsonArray::const_iterator QJsonArray:: constBegin () const

返回常量 STL 样式迭代器 pointing to the first item in the array.

另请参阅 begin () 和 constEnd ().

QJsonArray::const_iterator QJsonArray:: constEnd () const

返回常量 STL 样式迭代器 pointing to the imaginary item after the last item in the array.

另请参阅 constBegin () 和 end ().

bool QJsonArray:: contains (const QJsonValue & value ) const

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

另请参阅 count ().

qsizetype QJsonArray:: count () const

如同 size ().

另请参阅 size ().

bool QJsonArray:: empty () const

此函数为兼容 STL (标准模板库) 提供。它相当于 isEmpty () 并返回 true if the array is empty.

QJsonArray::iterator QJsonArray:: end ()

返回 STL 样式迭代器 pointing to the imaginary item after the last item in the array.

另请参阅 begin () 和 constEnd ().

QJsonArray::const_iterator QJsonArray:: end () const

这是重载函数。

QJsonArray::iterator QJsonArray:: erase ( QJsonArray::iterator it )

Removes the item pointed to by it , and returns an iterator pointing to the next item.

另请参阅 removeAt ().

QJsonValue QJsonArray:: first () const

Returns the first value stored in the array.

如同 at(0) .

另请参阅 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.

另请参阅 toVariantList () 和 QJsonValue::fromVariant ().

[static] QJsonArray QJsonArray:: fromVariantList (const QVariantList & list )

Converts the variant list list 到 QJsonArray .

QVariant values in list will be converted to JSON values.

注意： Conversion from QVariant is not completely lossless. Please see the documentation in QJsonValue::fromVariant () 了解更多信息。

另请参阅 toVariantList () 和 QJsonValue::fromVariant ().

void QJsonArray:: insert ( qsizetype i , const QJsonValue & value )

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.

另请参阅 append (), prepend (), replace ()，和 removeAt ().

QJsonArray::iterator QJsonArray:: insert ( QJsonArray::iterator before , const QJsonValue & value )

插入 value before the position pointed to by before , and returns an iterator pointing to the newly inserted item.

另请参阅 erase () 和 insert ().

bool QJsonArray:: isEmpty () const

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

另请参阅 size ().

QJsonValue QJsonArray:: last () const

Returns the last value stored in the array.

如同 at(size() - 1) .

另请参阅 at ().

void QJsonArray:: pop_back ()

此函数为兼容 STL (标准模板库) 提供。它相当于 removeLast (). The array must not be empty. If the array can be empty, call isEmpty () before calling this function.

void QJsonArray:: pop_front ()

此函数为兼容 STL (标准模板库) 提供。它相当于 removeFirst (). The array must not be empty. If the array can be empty, call isEmpty () before calling this function.

void QJsonArray:: prepend (const QJsonValue & value )

插入 value at the beginning of the array.

这如同 insert(0, value) and will prepend value to the array.

另请参阅 append () 和 insert ().

void QJsonArray:: push_back (const QJsonValue & value )

此函数为兼容 STL (标准模板库) 提供。它相当于 append (value) and will append value to the array.

void QJsonArray:: push_front (const QJsonValue & value )

此函数为兼容 STL (标准模板库) 提供。它相当于 prepend (value) and will prepend value to the array.

void QJsonArray:: removeAt ( qsizetype i )

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

另请参阅 insert () 和 replace ().

void QJsonArray:: 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.

另请参阅 removeAt () 和 removeLast ().

void QJsonArray:: 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.

另请参阅 removeAt () 和 removeFirst ().

void QJsonArray:: replace ( qsizetype i , const QJsonValue & value )

替换项在索引位置 i with value . i must be a valid index position in the array (i.e., 0 <= i < size() ).

另请参阅 operator[] () 和 removeAt ().

qsizetype QJsonArray:: size () const

Returns the number of values stored in the array.

[since 5.10] void QJsonArray:: swap ( QJsonArray & other )

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

该函数在 Qt 5.10 引入。

QJsonValue QJsonArray:: takeAt ( qsizetype i )

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() ).

若不使用返回值， removeAt () 效率更高。

另请参阅 removeAt ().

QVariantList QJsonArray:: toVariantList () const

Converts this object to a QVariantList.

返回创建的映射。

bool QJsonArray:: operator!= (const QJsonArray & other ) const

返回 true if this array is not equal to other .

[since 5.3] QJsonArray QJsonArray:: operator+ (const QJsonValue & value ) const

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

该函数在 Qt 5.3 引入。

另请参阅 operator+= ().

[since 5.3] QJsonArray &QJsonArray:: operator+= (const QJsonValue & value )

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

该函数在 Qt 5.3 引入。

另请参阅 append () 和 operator<< ().

[since 5.3] QJsonArray &QJsonArray:: operator<< (const QJsonValue & value )

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

该函数在 Qt 5.3 引入。

另请参阅 operator+= () 和 append ().

bool QJsonArray:: operator== (const QJsonArray & other ) const

返回 true if this array is equal to other .

QJsonValueRef QJsonArray:: operator[] ( qsizetype i )

Returns the value at index position i 作为可修改引用。 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.

另请参阅 at ().

QJsonValue QJsonArray:: operator[] ( qsizetype i ) const

这是重载函数。

如同 at ().