;; MsgBox.lsp (c) 2001-2003, John F. Uhden, Cadlantic/CADvantage
;; A cute little utility to invoke a VBA message box and return a
;; value to AutoLisp.
;; Requires AutoCAD 2000 (R15) or higher.
;; The buttons are a Boolean value representing a logical sum of
;; the following values:
;;--------------------------------------------------------
;; MsgBox(prompt[, buttons][, title][, helpfile, context])
;; Buttons:
;; vbOKOnly    0 Display OK button only.
;; vbOKCancel    1 Display OK and Cancel buttons.
;; vbAbortRetryIgnore    2 Display Abort, Retry, and Ignore buttons.
;; vbYesNoCancel    3 Display Yes, No, and Cancel buttons.
;; vbYesNo    4 Display Yes and No buttons.
;; vbRetryCancel    5 Display Retry and Cancel buttons.
;; vbCritical   16 Display Critical Message icon.
;; vbQuestion   32 Display Warning Query icon.
;; vbExclamation   48 Display Warning Message icon.
;; vbInformation   64 Display Information Message icon.
;; vbDefaultButton1    0 First button is default.
;; vbDefaultButton2  256 Second button is default.
;; vbDefaultButton3  512 Third button is default.
;; vbDefaultButton4  768 Fourth button is default.
;; vbApplicationModal    0 Application modal; the user must respond to the message box before continuing work in the current application.
;; vbSystemModal 4096 System modal; all applications are suspended until the user responds to the message box.

;; Revised (01-27-03) thanks to Ed Jobe's contribution about snagging the return value.
(defun MsgBox (Title Buttons Message / useri1 value)
  (vl-load-com)
  (or *acad* (setq *acad* (vlax-get-acad-object)))
  (setq useri1 (getvar "useri1"))
  (acad-push-dbmod)
  (vla-eval
    *acad*
    (strcat
      "ThisDrawing.SetVariable \"USERI1\","
      "MsgBox (\""
      Message "\","
      (itoa Buttons) ",\""
      Title "\")"
    )
  )
  (setq value (getvar "useri1"))
  (setvar "useri1" useri1)
  (acad-pop-dbmod)
  value
)