stroke coordinates in Wpf application

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C#

WPF

I have the following code to find the coordinates of all the strokes in inkcanvas.

private string GetAllPoints(InkCanvas oInkCanvas)
        {
            int iS = -1;
            int iP;
            string sP = "";
            string s = "";
            string r = "\r\n";

            System.Windows.Input.StylusPointCollection colStylusPoints;
            foreach (Stroke oS in oInkCanvas.Strokes)
            {
                iP = -1;
              
                // Header for each Stroke.
        

                if (oS.DrawingAttributes.FitToCurve == true)
                {

                    colStylusPoints = oS.GetBezierStylusPoints();
                    foreach (StylusPoint oPoint in colStylusPoints)
                    {
                        iP += 1;
                        s +=((int)oPoint.X).ToString() + "\t" +
                        ((int)oPoint.Y).ToString() + r;
                    }
                }

                else
                {

                    colStylusPoints = oS.StylusPoints;
                    foreach (StylusPoint oPoint in colStylusPoints)
                    {
                        iP += 1;
                        s += 
                        ((int)oPoint.X).ToString() + "\t" +
                        ((int)oPoint.Y).ToString() + r;
                    }
                }
            }
            return s;
        }

Actually i need to find the coordinates of the current stroke i have drawn and not the coordinates of the previous strokes on inkcanvas.

How do i make the modifications?