Sub Main

'Declare SurferApp as an object
	Dim SurferApp As Object
	Set SurferApp = CreateObject("Surfer.Application")
	SurferApp.Visible = True

'Specifies the upper and lower surfaces. The upper surface is a grid file, the lower
'surface can be another grid file or a constant Z value
	UpperSurface = SurferApp.Path+"\samples\demogrid.grd"
	LowerSurface = 0

'Calculates the volume and area. This method does not display the report window
	Dim Results() As Double
	SurferApp.GridVolume(upper:=UpperSurface,lower:=LowerSurface, presults:=Results, showreport:=False)
	
'Create a new worksheet window
	Set Wks = SurferApp.Documents.Add(srfDocWks)

'Put the contents of pResults (the Grid Volume report) in the worksheet cells
	Wks.Cells("A1") = "Upper Surface:"
	Wks.Cells("B1") = UpperSurface

	Wks.Cells("A2") = "Lower Surface:"
	Wks.Cells("B2") = LowerSurface

	Wks.Cells("A4").Value = "Trapezoidal Rule:"
	Wks.Cells("B4").Value =	Results(srfGVTrapVol)

	Wks.Cells("A5").Value = "Simpson's Rule:"
	Wks.Cells("B5").Value = Results(srfGVSimpVol)

	Wks.Cells("A6").Value = "Simpson's 3/8 Rule:"
	Wks.Cells("B6").Value = Results(srfGVSimp38Vol)

	Wks.Cells("A7").Value = "Positive Volume [Cut]:"
	Wks.Cells("B7").Value = Results(srfGVPosVol)

	Wks.Cells("A8").Value = "Negative Volume [Fill]:"
	Wks.Cells("B8").Value = Results(srfGVNegVol)

	Wks.Cells("A10").Value = "Positive Planar Area:"
	Wks.Cells("B10").Value = Results(srfGVPosPlanarArea)

	Wks.Cells("A11").Value = "Negative Planar Area:"
	Wks.Cells("B11").Value = Results(srfGVNegPlanarArea)

	Wks.Cells("A12").Value = "Positive Area:"
	Wks.Cells("B12").Value = Results(srfGVPosArea)

	Wks.Cells("A13").Value = "Negative Area:"
	Wks.Cells("B13").Value = Results(srfGVNegArea)

	Wks.Cells("A14").Value = "Blanked Area:"
	Wks.Cells("B14").Value = Results(srfGVBlankedArea)

'Save worksheet
	Wks.SaveAs(SurferApp.Path+"\samples\VolumeReport.dat")

End Sub