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Marlin - Short file name from a Long file name


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Posted · Marlin - Short file name from a Long file name

I'm posting this here because some of you folks are really good with software.


I've been working on an application and one of the features I'd like to add is to be able to call a 2nd gcode file from within a 1st gcode file.  M32 works but requires the 8.3 filename to be written on the line in the 1st gcode file.

I've posted on the RepRap Marlin forum but I thought I'd ask here as well...Is there a way to anticipate how a long file name will be truncated to an 8.3 filename by a printer?


As an example, if I copy "B.gcode" to an SD card, stick it in the printer, and query with M20 I get back "B2726~1.GCO".  Then I have to go back into my gcode file and alter my line to M32 S????? B2726~1.GCO.  It's a clumsy way to accomplish what I'm trying to do.  A user would probably find it daunting if not impossible.  If someone could point me in the right direction I'd appreciate it.




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    Posted (edited) · Marlin - Short file name from a Long file name

    I get to pull this out of my "Things I never knew" file (it's still over a yottabyte) and put it in the "Well now I know" file.



    The operating system in the computer assigns the 8.3 file name to any file.  The printer just pulls it out and displays it.


    This was also from the reading assignment.  I think it stays in the "Things I don't understand" file.

    "... followed by 4 hexadecimal digits derived from an undocumented hash of the filename."

    Edited by GregValiant
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