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

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公共函数

	QOpcUaBinaryDataEncoding (QOpcUaExtensionObject & object )
	QOpcUaBinaryDataEncoding (QByteArray * buffer )
T	decode (bool & success )
QList<T>	decodeArray (bool & success )
bool	encode (const T & src )
bool	encodeArray (const QList<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> QList < 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 QList < 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().