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GetValueByIndex - method of the tvPoints object

Description:
Returns a value of i-th data point. The specified value of the index depends on the nIndexType parameter and refers either to the whole buffer or only to the visible part of the buffer.
Syntax:
Variant GetValueByIndex(Long nIndex, Long nIndexType)
Parameters:
nIndex(Long) Index to the buffer array
>=0 - index to the buffer array
-2 - the time of the latest data point is returned
nIndexType(Long) What refers the nIndex parameter to
0 - refers to the beginning of the buffer
1 - refrers to the first data point that is displayed by the buffer viewer
Return values:
The method returns the value of the data point on the index.

If no point has been found then the method returns: null for JavaScript or Empty pro VBScript (it can be tested by the Pm.IsValid method).

See also:
Example:
JavaScriptVBScriptSelect and copy to clipboard

var oTView = pMe.Items("../TrendView");
var oPoints = oTView.Trends("t1").Points;
var nVal = oPoints.GetValueByIndex(5, 0);
if (Pm.IsValid(nVal))
Pm.Debug(nVal);
PROMOTIC 9.0.15 SCADA system documentation - MICROSYS, spol. s r.o.

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