QJsonArray 類

QJsonArray 類封裝 JSON 數組。 更多...

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

• 所有成員列錶，包括繼承成員
• QJsonArray is part of 在 Qt 中支持 JSON and 隱式共享類 .

此類 相等可比較 .

此類 相等可比較 with QJsonValue .

注意： 此類的所有函數 可重入 .

公共類型

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

公共函數

	QJsonArray ()
	QJsonArray (std::initializer_list<QJsonValue> args )
	QJsonArray (const QJsonArray & other )
	QJsonArray (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
QJsonArray::iterator	insert (QJsonArray::iterator before , const QJsonValue & value )
void	insert (qsizetype i , 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
QJsonArray	operator+ (const QJsonValue & value ) const
QJsonArray &	operator+= (const QJsonValue & value )
QJsonArray &	operator<< (const QJsonValue & value )
QJsonArray &	operator= (QJsonArray && other )
QJsonArray &	operator= (const QJsonArray & other )
QJsonValueRef	operator[] (qsizetype i )
QJsonValue	operator[] (qsizetype i ) const

靜態公共成員

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

相關非成員

bool	operator!= (const QJsonArray & lhs , const QJsonArray & rhs )
bool	operator== (const QJsonArray & lhs , const QJsonArray & rhs )

詳細描述

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 .

另請參閱 在 Qt 中支持 JSON and 保存和加載遊戲 .

成員類型文檔編製

QJsonArray:: ConstIterator

Qt 樣式同義詞 QJsonArray::const_iterator .

QJsonArray:: Iterator

Qt 樣式同義詞 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 對於 QJsonValue *. Provided for STL compatibility.

QJsonArray:: reference

typedef 對於 QJsonValue &. Provided for STL compatibility.

QJsonArray:: size_type

Typedef for qsizetype. Provided for STL compatibility.

QJsonArray:: value_type

typedef 對於 QJsonValue . Provided for STL compatibility.

成員函數文檔編製

QJsonArray:: QJsonArray ()

Creates an empty array.

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() };
					

[noexcept] QJsonArray:: QJsonArray (const QJsonArray & other )

創建副本為 other .

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

[noexcept] QJsonArray:: QJsonArray ( QJsonArray && other )

Move-constructs a QJsonArray from other .

[noexcept] QJsonArray:: ~QJsonArray ()

Deletes the array.

void QJsonArray:: append (const QJsonValue & value )

插入 value at the end of the array.

另請參閱 prepend () 和 insert ().

QJsonValue QJsonArray:: at ( qsizetype i ) const

返迴 QJsonValue representing the value for index i .

返迴的 QJsonValue is Undefined ，若 i is out of bounds.

QJsonArray::iterator QJsonArray:: begin ()

返迴 STL 樣式迭代器 pointing to the first item in the array.

另請參閱 constBegin () 和 end ().

QJsonArray::const_iterator QJsonArray:: begin () const

這是重載函數。

QJsonArray::const_iterator QJsonArray:: cbegin () const

返迴常量 STL 樣式迭代器 pointing to the first item in the array.

另請參閱 begin () 和 cend ().

QJsonArray::const_iterator QJsonArray:: cend () const

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 cbegin () 和 end ().

QJsonArray::const_iterator QJsonArray:: constBegin () const

返迴常量 STL 樣式迭代器 pointing to the first item in the array.

另請參閱 begin () 和 constEnd ().

QJsonArray::const_iterator QJsonArray:: constEnd () const

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 ().

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

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

另請參閱 count ().

qsizetype QJsonArray:: count () const

如同 size ().

另請參閱 size ().

bool QJsonArray:: empty () const

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.

QJsonArray::iterator QJsonArray:: end ()

返迴 STL 樣式迭代器 pointing to the imaginary item after the last item in the array.

另請參閱 begin () 和 constEnd ().

QJsonArray::const_iterator QJsonArray:: end () const

這是重載函數。

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

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

另請參閱 removeAt ().

QJsonValue QJsonArray:: first () const

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.

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

另請參閱 toVariantList () 和 QJsonValue::fromVariant ().

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.

另請參閱 erase () and insert().

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.

另請參閱 append (), prepend (), replace ()，和 removeAt ().

bool QJsonArray:: isEmpty () const

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

另請參閱 size ().

QJsonValue QJsonArray:: last () const

Returns the last value stored in the array.

如同 at(size() - 1) .

另請參閱 at ().

void QJsonArray:: pop_back ()

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.

void QJsonArray:: pop_front ()

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.

void QJsonArray:: prepend (const QJsonValue & value )

插入 value at the beginning of the array.

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

另請參閱 append () 和 insert ().

void QJsonArray:: push_back (const QJsonValue & value )

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.

void QJsonArray:: push_front (const QJsonValue & value )

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.

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() ).

另請參閱 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.

另請參閱 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.

另請參閱 removeAt () 和 removeFirst ().

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

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 ().

qsizetype QJsonArray:: size () const

Returns the number of values stored in the array.

[noexcept] void QJsonArray:: swap ( QJsonArray & other )

Swaps this array with other 。此操作很快且從不失敗。

QJsonValue QJsonArray:: takeAt ( qsizetype i )

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 ().

QVariantList QJsonArray:: toVariantList () const

把此對象轉換成 QVariantList .

返迴創建的映射。

QJsonArray QJsonArray:: operator+ (const QJsonValue & value ) const

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

另請參閱 operator+= ().

QJsonArray &QJsonArray:: operator+= (const QJsonValue & value )

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

另請參閱 append () 和 operator<< ().

QJsonArray &QJsonArray:: operator<< (const QJsonValue & value )

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

另請參閱 operator+= () 和 append ().

[noexcept] QJsonArray &QJsonArray:: operator= ( QJsonArray && other )

移動賦值 other 到此數組。

[noexcept] QJsonArray &QJsonArray:: operator= (const QJsonArray & other )

賦值 other 到此數組。

QJsonValueRef QJsonArray:: operator[] ( qsizetype i )

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 ().

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

這是重載函數。

如同 at ().

相關非成員

[noexcept] bool operator!= (const QJsonArray & lhs , const QJsonArray & rhs )

返迴 true if lhs array is not equal to rhs , false 否則。

[noexcept] bool operator== (const QJsonArray & lhs , const QJsonArray & rhs )

返迴 true if lhs array is equal to rhs , false 否則。

內容

1. 公共類型

2. 公共函數

3. 靜態公共成員

4. 相關非成員

5. 詳細描述