The QJsonObject class encapsulates a JSON object. 更多...
| 頭： | #include <QJsonObject> |
| 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 | key_type |
| typedef | mapped_type |
| typedef | size_type |
| QJsonObject () | |
| QJsonObject (std::initializer_list<QPair<QString, QJsonValue> > args ) | |
| QJsonObject (const QJsonObject & other ) | |
| ~QJsonObject () | |
| iterator | begin () |
| const_iterator | begin () const |
| const_iterator | constBegin () const |
| const_iterator | constEnd () const |
| const_iterator | constFind (const QString & key ) const |
| const_iterator | constFind (QLatin1String key ) const |
| bool | contains (const QString & key ) const |
| bool | contains (QLatin1String key ) const |
| int | count () const |
| bool | empty () const |
| iterator | end () |
| const_iterator | end () const |
| iterator | erase (iterator it ) |
| iterator | find (const QString & key ) |
| iterator | find (QLatin1String key ) |
| const_iterator | find (const QString & key ) const |
| const_iterator | find (QLatin1String key ) const |
| iterator | insert (const QString & key , const QJsonValue & value ) |
| bool | isEmpty () const |
| QStringList | keys () const |
| int | length () const |
| void | remove (const QString & key ) |
| int | size () const |
| QJsonValue | take (const QString & key ) |
| QVariantHash | toVariantHash () const |
| QVariantMap | toVariantMap () const |
| QJsonValue | value (const QString & key ) const |
| QJsonValue | value (QLatin1String key ) const |
| bool | operator!= (const QJsonObject & other ) const |
| QJsonObject & | operator= (const QJsonObject & other ) |
| bool | operator== (const QJsonObject & other ) const |
| QJsonValue | operator[] (const QString & key ) const |
| QJsonValue | operator[] (QLatin1String key ) const |
| QJsonValueRef | operator[] (const QString & key ) |
| QJsonValueRef | operator[] (QLatin1String key ) |
| QJsonObject | fromVariantHash (const QVariantHash & hash ) |
| QJsonObject | fromVariantMap (const QVariantMap & map ) |
The QJsonObject class encapsulates a JSON object.
A JSON object is a list of key value pairs, where the keys are unique strings and the values are represented by a QJsonValue .
A QJsonObject can be converted to and from a QVariantMap . You can query the number of (key, value) pairs with size (), insert ()，和 remove () entries from it and iterate over its content using the standard C++ iterator pattern.
QJsonObject 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 object 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 QJsonObject::const_iterator .
Qt 樣式同義詞 QJsonObject::iterator .
typedef 對於 QString . Provided for STL compatibility.
typedef 對於 QJsonValue . Provided for STL compatibility.
typedef 對於 int。為兼容 STL 提供。
構造空的 JSON 對象。
另請參閱 isEmpty ().
構造 QJsonObject instance initialized from args initialization list. For example:
QJsonObject object { {"property1", 1}, {"property2", 2} };
該函數在 Qt 5.4 引入。
創建副本為 other .
由於 QJsonObject is implicitly shared, the copy is shallow as long as the object does not get modified.
銷毀對象。
返迴 STL 樣式迭代器 pointing to the first item in the object.
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 object.
返迴常量 STL 樣式迭代器 pointing to the imaginary item after the last item in the object.
另請參閱 constBegin () 和 end ().
Returns a const iterator pointing to the item with key key in the map.
If the map contains no item with key key ，函數返迴 constEnd ().
這是重載函數。
該函數在 Qt 5.7 引入。
返迴
true
if the object contains key
key
.
另請參閱 insert (), remove ()，和 take ().
這是重載函數。
該函數在 Qt 5.7 引入。
這是重載函數。
如同 size ().
此函數為兼容 STL (標準模闆庫) 提供。它相當於
isEmpty
(), returning
true
if the object is empty; otherwise returning
false
.
返迴 STL 樣式迭代器 pointing to the imaginary item after the last item in the object.
這是重載函數。
Removes the (key, value) pair pointed to by the iterator it from the map, and returns an iterator to the next item in the map.
另請參閱 remove ().
Returns an iterator pointing to the item with key key in the map.
If the map contains no item with key key ，函數返迴 end ().
這是重載函數。
該函數在 Qt 5.7 引入。
這是重載函數。
這是重載函數。
該函數在 Qt 5.7 引入。
[static]
QJsonObject
QJsonObject::
fromVariantHash
(const
QVariantHash
&
hash
)
Converts the variant hash hash 到 QJsonObject .
The keys in hash will be used as the keys in the JSON object, and the QVariant values will be converted to JSON values.
該函數在 Qt 5.5 引入。
另請參閱 fromVariantMap (), toVariantHash ()，和 QJsonValue::fromVariant ().
[static]
QJsonObject
QJsonObject::
fromVariantMap
(const
QVariantMap
&
map
)
Converts the variant map map 到 QJsonObject .
The keys in map will be used as the keys in the JSON object, and the QVariant values will be converted to JSON values.
另請參閱 fromVariantHash (), toVariantMap ()，和 QJsonValue::fromVariant ().
Inserts a new item with the key key 和值 value .
If there is already an item with the key key , then that item's value is replaced with value .
Returns an iterator pointing to the inserted item.
If the value is QJsonValue::Undefined , it will cause the key to get removed from the object. The returned iterator will then point to end ().
另請參閱 remove (), take (), QJsonObject::iterator ，和 end ().
返迴
true
if the object is empty. This is the same as
size
() == 0.
另請參閱 size ().
返迴在此對象中的所有鍵列錶。
The list is sorted lexographically.
這是重載函數。
如同 size ().
移除 key 從對象。
Returns the number of (key, value) pairs stored in the object.
移除 key 從對象。
返迴 QJsonValue containing the value referenced by key 。若 key was not contained in the object, the returned QJsonValue is QJsonValue::Undefined .
另請參閱 insert (), remove ()，和 QJsonValue .
把此對象轉換成 QVariantHash .
返迴創建的哈希。
該函數在 Qt 5.5 引入。
另請參閱 toVariantMap ().
把此對象轉換成 QVariantMap .
返迴創建的映射。
另請參閱 toVariantHash ().
返迴 QJsonValue 錶示值為鍵 key .
返迴的 QJsonValue is QJsonValue::Undefined 若鍵不存在。
另請參閱 QJsonValue and QJsonValue::isUndefined ().
這是重載函數。
該函數在 Qt 5.7 引入。
返迴
true
if
other
is not equal to this object.
賦值 other 到此對象。
返迴
true
if
other
is equal to this object.
返迴 QJsonValue 錶示值為鍵 key .
This does the same as value ().
返迴的 QJsonValue is QJsonValue::Undefined 若鍵不存在。
另請參閱 value (), QJsonValue ，和 QJsonValue::isUndefined ().
這是重載函數。
該函數在 Qt 5.7 引入。
Returns a reference to the value for key .
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 element in the QJsonArray or QJsonObject from which you got the reference.
另請參閱 value ().
這是重載函數。
該函數在 Qt 5.7 引入。