QOpcUaBinaryDataEncoding Class

QOpcUaBinaryDataEncoding is a partial implementation of the OPC UA binary data encoding described in OPC-UA part 6. 更多...

头: #include <QOpcUaBinaryDataEncoding>
qmake: QT += opcua

公共函数

QOpcUaBinaryDataEncoding (QOpcUaExtensionObject & object )
QOpcUaBinaryDataEncoding (QByteArray * buffer )
T decode (bool & success )
QVector<T> decodeArray (bool & success )
bool encode (const T & src )
bool encodeArray (const QVector<T> & src )
int offset () const
void setOffset (int offset )
void truncateBufferToOffset ()

详细描述

It offers template functions for encoding and decoding data for reading and writing extension objects.

The following types are supported:

Qt 类型 OPC UA type
quint8 uint8
qint8 int8
quint16 uint16
qint16 int16
quint32 uint32
qint32 int32
quint64 uint64
qint64 int64
float float
double double
QString 字符串
QOpcUaQualifiedName QualifiedName
QOpcUaLocalizedText LocalizedText
QOpcUaEUInformation EUInformation
QOpcUaRange Range
QOpcUaComplexNumber ComplexNumber
QOpcUaDoubleComplexNumber DoubleComplexNumber
QOpcUaAxisInformation AxisInformation
QOpcUaXValue XV
QUuid GUID
QString node id NodeId
QByteArray ByteString
QDateTime DateTime
QOpcUa::UaStatusCode StatusCode
QOpcUaExpandedNodeId ExpandedNodeId
QOpcUaExtensionObject ExtensionObject
QOpcUaArgument 自变量
QOpcUaApplicationRecordDataType ApplicationRecordDataType

成员函数文档编制

QOpcUaBinaryDataEncoding:: QOpcUaBinaryDataEncoding ( QOpcUaExtensionObject & object )

Constructs a binary data encoding object using the encoded body of object as data buffer.

object must not be deleted as long as this binary data encoding oject is used.

QOpcUaBinaryDataEncoding:: QOpcUaBinaryDataEncoding ( QByteArray * buffer )

Constructs a binary data encoding object for the data buffer buffer . buffer must not be deleted as long as this binary data encoding object is used.

template <typename T, QOpcUa::Types OVERLAY> T QOpcUaBinaryDataEncoding:: decode ( bool & success )

Decodes a scalar value of type T from the data buffer. success 被设为 true if the decoding was successful, false 若不。

The decoded value is returned. If success is false, the returned value is invalid.

另请参阅 decodeArray ().

template <typename T, QOpcUa::Types OVERLAY> QVector < T > QOpcUaBinaryDataEncoding:: decodeArray ( bool & success )

Decodes an array of type T from the data buffer. success 被设为 true if the decoding was successful, false 若不。

The decoded value is returned. If success is false, the returned value is invalid.

另请参阅 decode ().

template <typename T, QOpcUa::Types OVERLAY> bool QOpcUaBinaryDataEncoding:: encode (const T & src )

Encodes src of type T and appends the encoded value to the data buffer. Returns true if the value has been successfully encoded.

另请参阅 encodeArray ().

template <typename T, QOpcUa::Types OVERLAY> bool QOpcUaBinaryDataEncoding:: encodeArray (const QVector < T > & src )

Encodes all elements of type T in src and appends the encoded values to the data buffer.

返回 true if the value has been successfully encoded.

另请参阅 encode ().

int QOpcUaBinaryDataEncoding:: offset () const

Returns the current offset in the data buffer.

另请参阅 setOffset ().

void QOpcUaBinaryDataEncoding:: setOffset ( int offset )

Sets the current offset in the data buffer to offset . The first byte in the buffer has the offset 0.

另请参阅 offset ().

void QOpcUaBinaryDataEncoding:: truncateBufferToOffset ()

Truncates the data buffer to the current offset (). If the offset is behind the current buffer size, this method does nothing.

This method can be used to roll back after an unsuccessful encode by setting the old offset and calling truncateBufferToOffset().