Qt provides support for dealing with CBOR data. CBOR is a binary format to store data that has a superset of the types available in JSON, but is more compact.
The CBOR support in Qt provides an easy to use C++ API to parse, modify and save CBOR data.
More details about the CBOR data format can be found in RFC 7049 .
CBOR is a format to store structured data. It has three groups of built-in types:
In addition, CBOR can add a "tag" to extend the meaning of the type. The container types can contain basic types, string-like types and containers.
The
QCborValue
class represents any CBOR type. It also has a simple API for reading and writing to
QCborStreamReader
and
QCborStreamWriter
objects, as well as manipulating such objects in memory, with the help of
QCborArray
and
QCborMap
. The CborValue API is simplified from the full CBOR data type and always represents all integers as
qint64
and all floating-point as
double
。这意味着
QCborValue
is unable to represent CBOR integer values outside of the range of
qint64
(-2^63 to 2^63-1). When creating a CBOR stream,
QCborValue::toCbor
() can be configured to attempt to write the shorter single- and half-precision floating-point representations.
The QCborArray class is used to hold an array of QCborValue objects. A QCborValue object can contain a QCborArray object. It has functions for converting to and from QVariantList, QStringList , QJsonArray .
The QCborMap class is used to hold an map of QCborValue objects. A QCborValue object can contain a QCborMap object. It has functions for converting to and from QVariantMap, QVariantMap, and QJsonObject , but it can have keys of any type, not just QString .
The QCborStreamReader class is a low level API for reading CBOR data from a QIODevice ， QByteArray , or a pointer to memory. It has an API similar to the QXmlStreamReader 类。
The QCborStreamWriter class is a low level API for writing CBOR data to a QIODevice 或 QByteArray . It has an API similar to the QXmlStreamWriter 类。
另请参阅 Parsing and displaying CBOR data , Convert Example ，和 JSON 保存游戏范例 .
| QCborArray | 用于保持 CBOR (简明二进制对象表示) 元素的数组 |
| QCborArray::ConstIterator | QCborArray::ConstIterator class provides an STL-style const iterator for QCborArray |
| QCborArray::Iterator | QCborArray::Iterator class provides an STL-style non-const iterator for QCborArray |
| QCborMap | 用于保持以 CBOR 表示的关联容器 |
| QCborMap::ConstIterator | QCborMap::ConstIterator 类为 QCborMap 提供 STL 样式的常量迭代器 |
| QCborMap::Iterator | QCborMap::Iterator 类为 QCborMap 提供 STL 样式的非常量迭代器 |
| QCborParserError | 用于 QCborValue 以报告剖析错误 |
| QCborStreamReader | 操作 QByteArray 或 QIODevice 的简单 CBOR 流解码器 |
| QCborStreamWriter | 操作单向流的简单 CBOR 编码器 |
| QCborValue | 封装值在 CBOR 中 |
