class QOpcUaHistoryReadRawRequest#

This class stores the necessary information to request historic data from a server. More…

New in version 6.3.

Synopsis#

Methods#

def __init__()
def addNodeToRead()
def endTimestamp()
def nodesToRead()
def numValuesPerNode()
def __ne__()
def returnBounds()
def setEndTimestamp()
def setNodesToRead()
def setNumValuesPerNode()
def setReturnBounds()
def setStartTimestamp()
def setTimestampsToReturn()
def startTimestamp()
def swap()
def timestampsToReturn()

Note

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Detailed Description#

This is the Qt OPC UA representation for the OPC UA ReadRawModifiedDetails for reading historical data defined in OPC UA 1.04 part 11, 6.4.3 .

When requesting historic data from a server, several values need to be provided to the server to know which data to collect. The QOpcUaHistoryReadRawRequest class provides the required values. startTimestamp and endTimestamp define the timerange where historic data should be collected from. nodesToRead defines from which nodes historic data should be collected. numValuesPerNode defines the maximum number of data values that should be returned per node. returnBounds defines if the bounding values should be included in the result.

__init__(nodesToRead, startTimestamp, endTimestamp[, numValuesPerNode=0[, returnBounds=false]])#

Parameters:

nodesToRead – .list of QOpcUaReadItem
startTimestamp – QDateTime
endTimestamp – QDateTime
numValuesPerNode – int
returnBounds – bool

Constructs a QOpcUaHistoryReadRawRequest item with the given values.

__init__(nodesToRead, startTimestamp, endTimestamp, numValuesPerNode, returnBounds, arg__6)

Parameters:

nodesToRead – .list of QOpcUaReadItem
startTimestamp – QDateTime
endTimestamp – QDateTime
numValuesPerNode – int
returnBounds – bool
arg__6 – TimestampsToReturn

Constructs a QOpcUaHistoryReadRawRequest item with the given values. The timestampsToReturn parameter determines the timestamps to return for each value.

__init__(other)

Parameters:: other – QOpcUaHistoryReadRawRequest

Constructs a QOpcUaHistoryReadRawRequest item from other.

__init__()

Constructs an invalid QOpcUaHistoryReadRawRequest .

addNodeToRead(nodeToRead)#

Parameters:: nodeToRead – QOpcUaReadItem

Adds a node to the nodeToRead list.

endTimestamp()#

Return type:: QDateTime

Returns the end time stamp.

See also

setEndTimestamp()

nodesToRead()#

Return type:: .list of QOpcUaReadItem

Returns the list of nodes to read.

See also

setNodesToRead()

numValuesPerNode()#

Return type:: int

Returns the number of values per node.

See also

setNumValuesPerNode()

__ne__(rhs)#

Parameters:: rhs – QOpcUaHistoryReadRawRequest
Return type:: bool

Returns true if lhs is not equal to rhs; otherwise returns false.

Two QOpcUaHistoryReadRawRequest items are considered not equal if their startTimestamp, endTimestamp, numValuesPerNode, returnBounds or nodesToRead are not equal.

returnBounds()#

Return type:: bool

Returns if the return bounds should be requested.

See also

setReturnBounds()

setEndTimestamp(endTimestamp)#

Parameters:: endTimestamp – QDateTime

Sets endTimestamp for the historical data to be fetched.

See also

endTimestamp()

setNodesToRead(nodesToRead)#

Parameters:: nodesToRead – .list of QOpcUaReadItem

Sets the nodesToRead list.

See also

nodesToRead()

setNumValuesPerNode(numValuesPerNode)#

Parameters:: numValuesPerNode – int

Sets numValuesPerNode to indicate the number of values per node to be fetched.

See also

numValuesPerNode()

setReturnBounds(returnBounds)#

Parameters:: returnBounds – bool

Sets returnBounds to indicate if the return bounds should be requested.

See also

returnBounds()

setStartTimestamp(startTimestamp)#

Parameters:: startTimestamp – QDateTime

Sets startTimestamp for the historical data to be fetched.

See also

startTimestamp()

setTimestampsToReturn(timestampsToReturn)#

Parameters:: timestampsToReturn – TimestampsToReturn

Sets the selected timestamps to return for each value to timestampsToReturn.

See also

timestampsToReturn()

startTimestamp()#

Return type:: QDateTime

Returns the start time stamp.

See also

setStartTimestamp()

swap(other)#

Parameters:: other – QOpcUaHistoryReadRawRequest

Swaps this request instance with other. This function is very fast and never fails.

timestampsToReturn()#

Return type:: TimestampsToReturn

Returns the selected timestamps to return for each value.

See also

setTimestampsToReturn()