Developer: RhinoScript
Summary: Demonstrates how to convert a folder of AutoCAD files to Rhino 3DM files using RhinoScript.

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 ' BatchConvertAutoCAD script for Rhinoceros
 ' Robert McNeel & Associates
 ' www.rhino3d.com
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 Option Explicit
 
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 ' BatchConvertAutoCAD
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 Sub BatchConvertAutoCAD()
 
   ' Make sure RhinoScript does not reinitialize when opening models,
   ' otherwise this script will only process one file.
   Rhino.Command "_-Options _RhinoScript _Reinitialize=_No _Enter _Enter", 0
 
   ' Allow the user to interactively pick a folder
   Dim sFolder
   sFolder = Rhino.BrowseForFolder(, "Select folder to process", "Batch Convert AutoCAD")
   If VarType(sFolder) <> vbString Then Exit Sub
 
   ' Create a file system object
   Dim oFSO
   Set oFSO = CreateObject("Scripting.FileSystemObject") 
 
   ' Get a folder object based on the selected folder
   Dim oFolder
   Set oFolder = oFSO.GetFolder(sFolder)
 
   ' Process the folder
   ProcessFolder oFSO, oFolder
 
   ' Release the objects
   Set oFolder = Nothing
   Set oFSO = Nothing
 
   ' Close the last file processed
   Rhino.DocumentModified False
   Rhino.Command "_-New _None", 0
 
 End Sub
 
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 ' ProcessFolder
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 Sub ProcessFolder(oFSO, oFolder)
 
   ' Process all .dwg files in the selected folder
   Dim oFile, strOpen, strSave
   For Each oFile In oFolder.Files
     If LCase(oFSO.GetExtensionName(oFile.Path)) = "dwg" Then
       strOpen = LCase(oFile.Path)
       strSave = LCase(Replace(strOpen, ".dwg", ".3dm", 1, -1, 1))
       ProcessFile strOpen, strSave
     End If
   Next
 
   ' Comment out the following lines if you do not
   ' want to recursively process the selected folder.
   Dim oSubFolder
   For Each oSubFolder In oFolder.SubFolders
     ProcessFolder oFSO, oSubFolder
   Next
 
 End Sub 
 
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 ' ProcessFile
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 Sub ProcessFile(strOpen, strSave)
   Rhino.DocumentModified False
   Rhino.Command "_-Open " & Chr(34) & strOpen & Chr(34), 0
   Rhino.Command "_-Zoom _All _Extents", 0
   Rhino.Command "_-SetActiveView _Top", 0
   Rhino.Command "_-Save " & Chr(34) & strSave & Chr(34), 0
 End Sub