Using Programming Languages other than VBA

Sub Example_PostScriptPrologFile()
	' This example returns the current setting of
	' PostScriptPrologFile. It then changes the value, and finally
	' it resets the value back to the original setting.

	Dim preferences As AcadPreferences
	Dim currPostScriptPrologFile As String
	Dim newPostScriptPrologFile As String

	Set preferences = ThisDrawing.Application.preferences

	' Retrieve the current PostScriptPrologFile value
	currPostScriptPrologFile = preferences.Files.PostScriptPrologFile
	If currPostScriptPrologFile = "" Then
		MsgBox "PostScriptPrologFile is not currently set.", vbInformation, "PostScriptPrologFile Example"
	Else
		MsgBox "The current value for PostScriptPrologFile is " & currPostScriptPrologFile, vbInformation, "PostScriptPrologFile Example"
	End If

	' Change the value for PostScriptPrologFile
	newPostScriptPrologFile = "TestPostScriptPrologFile"
	preferences.Files.PostScriptPrologFile = newPostScriptPrologFile
	MsgBox "The new value for PostScriptPrologFile is " & newPostScriptPrologFile, vbInformation, "PostScriptPrologFile Example"

	' Reset PostScriptPrologFile to its original value
	preferences.Files.PostScriptPrologFile = currPostScriptPrologFile
	If currPostScriptPrologFile = "" Then
		MsgBox "PostScriptPrologFile is reset to NULL.", vbInformation, "PostScriptPrologFile Example"
	Else
		MsgBox "The PostScriptPrologFile value is reset to " & currPostScriptPrologFile, vbInformation, "PostScriptPrologFile Example"
	End If
End Sub