COM - dpGetAsynch()
Returns the historic values that were valid at that time.
Synopsis
HRESULT dpGetAsynch([in] DATE dtTime, [in] VARIANT vDpName, [out] VARIANT *vValues);
Parameter
| Parameter | Description |
|---|---|
| dtTime | Time |
| vDpName | Data point attributes |
| vValues | Values that are written |
Description
Reads values of data point attributes at a particular source time and writes these in the vValues. The type of vValues depends on the attribute type. If a data point does not exist, an error code is returned in vValues. If only the data point is specified, :_offline.._value is added. See also CTRL function dpGetAsynch().
EXAMPLE
(See ComSample.xls, CComSample)
Public Sub dpGetAsynch()
Dim vValue As Variant
Dim dTime As Date
'Heute, Mitternacht
dTime = Date
'Abfrage eines einzelnen Wertes
moComManager.dpGetAsynch dTime, " ExampleDP_Trend1.", vValue
Debug.Print dTime, "ExampleDP_Trend1.", vValue
End SubAssignment
COM
