To run this script:

1. Copy the script below, or download the attached BAS file: Loop SRFs export SHP contours.bas.
2. In a Windows Explorer window, navigate to C:\Program Files\Golden Software\Surfer.
3. Double click on Scripter.exe to launch Scripter.
4. Press Ctrl+A to select all of the existing lines then press DELETE.
5. If you copied this script, press Ctrl+V to paste it into Scripter. If you downloaded it, click File | Open, select the BAS file from your downloads directory, and click Open.
6. Change the file path, output file name, and data file extension in the User-defined variables section at the beginning of the script.
7. Click Script | Run to run the script.

'===============================
'Loop SRFs export SHP contours.bas
'===============================
'Opens all SRF file in directory, loops though Plot objects to find contour maps,
'and exports those contour maps to SHP
'===============================
Sub Main
Debug.Clear

'Initialize Surfer
Dim Plot1, ContourLayer As Object
Set SurferApp = CreateObject("surfer.application")
SurferApp.Visible = True

'===============================
'User-defined variables
'===============================
file_extension	= "srf"
file_directory	= "C:\surfer\input\"
outpath = "C:\surfer\output\"
'===============================
'Make sure the file extension has no extra "." and the data directory has a trailing "\"
file_extension	= LCase(Right(file_extension,(Len(file_extension) - InStrRev(file_extension,"."))))
If  Len(file_directory)-InStrRev(file_directory,"\") <> 0 Then file_directory = file_directory + "\"

'Set the variable "srf_file" equal to each SRF file in the directory
srf_file = Dir( file_directory  + "*." + file_extension)

'While there are still SRF file in the directory that haven't been opened with this script...
While srf_file <> ""

  'Declare Plot as an object and open an SRF file
  Set Plot1 = SurferApp.Documents.Open(file_directory + srf_file)

  'Loop through all objects in the project
  For i = 1 To Plot1.Shapes.Count

    'If the object is a map frame...
    If Plot1.Shapes.Item(i).Type = srfShapeMapFrame Then

      'Loop through the items within the map frame
      For j = 1 To Plot1.Shapes.Item(i).Overlays.Count

	'If the item is a contour map layer...
	If Plot1.Shapes.Item(i).Overlays.Item(j).Type = srfShapeContourMap Then

	  'Once you find a contour layer, get the naming convention set up
	  Set ContourLayer = Plot1.Shapes.Item(i).Overlays.Item(j)

	  'Save the contour layer name to a variable
	  layer_name = ContourLayer.Name

	  'Remove the file extension from the name
	  layer_name	= Left(layer_name, Len(layer_name)-4)

	  'Get the SRF Surfer project name, remove the extension, and add a dash
	  srf_export_file	= Left(srf_file, Len(srf_file)-(Len(srf_file)-InStrRev(srf_file,".")+1) ) + "-"

	  'Exports the contours to a 2D SHP file. File name is the SRF file name-Contour layer name.shp
	  ContourLayer.ExportContours(FileName:=outpath + srf_export_file + layer_name + ".shp", Format:=srfConFormatShp2D)
        End If
      Next j
    End If
  Next i

  'Print the Surfer file name
  Debug.Print srf_file

  'Get next SRF file from the directory
  srf_file = Dir()
Wend

'Close Surfer
SurferApp.Quit
End Sub

Updated November 9, 2018