'Loop-SelectDataFile.bas loops the process of selecting a data file, gridding the data,
'creating a map, and saving the SRF file.

'By default, the X, Y and Z columns in the data file must be in columns A, B and C.
'You can change this in the GridData line.

'================================================

Sub Main

	Dim SurferApp As Object
	Set SurferApp = CreateObject("Surfer.Application")
	SurferApp.Visible = True

Do
	'Opens a new plot document
		Dim Plot As Object
		Set Plot = SurferApp.Documents.Add

	'Prompt the user for the name of the data file to process.
		InFile = GetFilePath(" ","DAT;TXT;CSV;XLS",CurDir(), "Select Data File", 0)
		If InFile = "" Then Exit Do

	'Get file name without the extension (for example, "week5.txt becomse "week5")
		BaseName = InFile
		ExtStart = InStrRev(InFile, ".")
		If ExtStart >1 Then BaseName = Left(InFile,ExtStart-1)

	'Create a grid from the specified data file
		GridFile = BaseName + ".grd"
		SurferApp.GridData (DataFile:= InFile, OutGrid:= GridFile)

	'Creates a contour map from the grid file
		Dim Map As Object
		Set Map = Plot.Shapes.AddContourMap(GridFileName:=GridFile)

	'Save to SRF
		Plot.SaveAs (FileName:=BaseName+".srf")

	'Closes the plot
		Plot.Close
Loop


End Sub