PySide6.QtOpcUa.QOpcUaBinaryDataEncoding

class QOpcUaBinaryDataEncoding

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

Synopsis

Methods

• def __init__()

• def offset()

• def setOffset()

• def truncateBufferToOffset()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

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

The following types are supported:

Qt type	OPC UA type
quint8	uint8
qint8	int8
quint16	uint16
qint16	int16
quint32	uint32
qint32	int32
quint64	uint64
qint64	int64
float	float
double	double
QString	String
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
UaStatusCode	StatusCode
QOpcUaExpandedNodeId	ExpandedNodeId
QOpcUaExtensionObject	ExtensionObject
QOpcUaArgument	Argument
QOpcUaDiagnosticInfo (since Qt 6.7)	DiagnosticInfo
QOpcUaApplicationRecordDataType	ApplicationRecordDataType
QOpcUaStructureDefinition (since Qt 6.7)	StructureDefintion
QOpcUaStructureField (since Qt 6.7)	StructureField
QOpcUaEnumDefinition (since Qt 6.7)	EnumDefintion
QOpcUaEnumField (since Qt 6.7)	EnumField
QOpcUaVariant (since Qt 6.7)	Variant
QOpcUaDataValue (since Qt 6.7)	DataValue

__init__(buffer)

Parameters:

buffer – QByteArray

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.

__init__(object)

Parameters:

object – QOpcUaExtensionObject

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 object is used.

offset()

Return type:

int

Returns the current offset in the data buffer.

See also

setOffset()

setOffset(offset)

Parameters:

offset – int

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

See also

offset()

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().