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Thread: UNDO COMMAND AUTOLISP 2021

  1. #1
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    Default UNDO COMMAND AUTOLISP 2021

    Is threre a change in the undo command in 2021 I use it and BE and it comes up nil

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    Default Re: UNDO COMMAND AUTOLISP 2021

    U and UNDO have always been slightly different

    U (Command) https://help.autodesk.com/view/ACD/2...8-FBABDAB1BB96
    Reverses the most recent operation.


    You can enter u repeatedly, reversing one step at a time, until the drawing is as it was when you began the current editing session.

    When an operation cannot be undone, the command name is displayed but no action is performed. Operations external to the current drawing, such as plotting or writing to a file, cannot be undone.

    If you changed modes or used transparent commands during a command, their effects are undone, along with the effects of the main command.

    The U command is equivalent to entering undo 1.


    UNDO has many options (Command) https://help.autodesk.com/view/ACD/2...B-4D8A38A8ADB8

    More options for lisp:
    vla-StartUndoMark
    vla-EndUndoMark

    Rather than using COMMAND in lisp you should use COMMAND-S or VL-CMDF.
    HTH

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