[编程交流] 如何检查特定Let

;; Drive Letters  -  Lee Mac
;; Returns a list of drive letters currently in use
(defun LM:driveletters ( / fso rtn )
   (if (setq fso (vlax-create-object "scripting.filesystemobject"))
       (progn
           (vl-catch-all-apply
              '(lambda ( )
                   (vlax-for obj (vlax-get fso 'drives)
                       (setq rtn (cons (vlax-get obj 'driveletter) rtn))
                   )
               )
           )
           (vlax-release-object fso)
           (vl-sort rtn '<)
       )
   )
)

; List all available disks (A: to Z:).
(defun KGA_File_DiskList ()
 (vl-remove-if-not
   'vl-file-directory-p
   '("A:" "B:" "C:" "D:" "E:" "F:" "G:" "H:" "I:" "J:" "K:" "L:" "M:" "N:" "O:" "P:" "Q:" "R:" "S:" "T:" "U:" "V:" "W:" "X:" "Y:" "Z:")
 )
)

_$ (mapcar (function (lambda (x) (strcat x ":"))) (mapcar 'chr (vl-string->list "ABCDEFGHIJKLMNOPQRSTUVWXYZ")))
("A:" "B:" "C:" "D:" "E:" "F:" "G:" "H:" "I:" "J:" "K:" "L:" "M:" "N:" "O:" "P:" "Q:" "R:" "S:" "T:" "U:" "V:" "W:" "X:" "Y:" "Z:")

; resets the paths usefull for update versions of Autocad; by A H 2011; This sets a reference to the install path of your product; the gets are their for info maybe other use; use this to find other settings ;(vlax-dump-object (vla-get-files (vla-get-preferences (vlax-get-Acad-object))) T)(vl-load-com)(defun setpaths ( / *files* doc) ; make temp directory(if (vl-file-directory-p "C:\\Acadtemp\")(Princ "Acadtemp exists")(vl-mkdir "C:\\AcadTEMP\"))(setq *files*  (vla-get-files  (vla-get-preferences (vlax-get-Acad-object)))); savepath;(vla-get-AutoSavepath *files*)(vla-put-AutoSavepath *files* "C:\\AcadTemp"); custom icons;(vla-get-CustomIconPath *files*))(vla-put-CustomIconPath *files* "P:\\Autodesk\\ICONS"); custom menu;(vla-get-Menufile *files*));(vla-put-Menufile  *files* "C:\\Users\\2013COGG"); printers config;(vla-get-PrinterConfigPath *files*)(vla-put-PrinterConfigPath *files* "P:\\AutoDESK\\Plotting\\Plot Styles 2011"); printers style sheet;(vla-get-PrinterStyleSheetPath *files*)(vla-put-PrinterStyleSheetPath *files* "P:\\AutoDESK\\Plotting\\Plot Styles"); printer drv's;(vla-get-PrinterDescPath *files*)(vla-put-PrinterDescPath *files* "P:\\AutoDESK\\Plotting\\Drv"); print spooler;(vla-get-PrintSpoolerPath *files*)(vla-put-PrintSpoolerPath *files* "C:\\AcadTemp\"); template  path;(vla-get-TemplateDwgPath *files*)(vla-put-TemplateDwgPath *files* "P:\\Autodesk\\c3d Templates"); template location;(vla-get-QnewTemplateFile *files*)(vla-put-QnewTemplateFile *files* "P:\\Autodesk\\c3d Templates\\gg.dwt");make new support paths exist + new(setq paths (vla-get-SupportPath *files*))(setq coggpaths "P:\\autodesk\\supportfiles;P:\\autodesk\\lisp;P:\\autodesk\\fonts;")(setq newpath (strcat coggpaths paths))(vla-put-SupportPath *files* newpath); Tempdirectory ;(vla-get-TempFilePath *files*))(vla-put-TempFilePath *files* "C:\\AcadTemp\");   PlotLogFilePath = "C:\\Documents and Settings\\ah\\localsettings\\application data\\autodesk\\c3d 2011\\enu\"(vla-put-PlotLogFilePath *files* "C:\\AcadTemp\");   LogFilePath = "C:\\Documents and Settings\\ah\\localsettings\\application data\\autodesk\\c3d 2011\\enu\"(vla-put-LogFilePath *files* "C:\\AcadTemp\"); xref temp path;(vla-get-TempXrefPath *files*))(vla-put-TempXrefPath *files* "C:\\AcadTemp\"); end use of *files*)(setpaths); exit quitely(princ "All Done")