Confusion regarding Layout info, plot device, and GetCanonicalMediaNames

[coopdetat]

I'm exploring how to use Visual Lisp to specify a specific plot configuration if it isn't already specified; but, I am confused by the information I am getting from GetCanonicalMediaNames.  The specified device "TIFF Version 6 (CCITT G4 2D Compression).pc3" has several user defined custom paper sizes but none of them are included in the list of Canonical Media Names:  Some have the same pixel dimensions but not all of the "UserDefinedRaster" pixel dimensions match paper sizes I've added.  Most notably the one size I use the most which I named "34x22 288dpi (9792,00 x 6336.00 Pixels)" is absent.

What is the connection between the paper sizes I am getting and the paper sizes that exist in the .pc3 file, if any?

Where are these GetCanonicalMediaNames paper sizes coming from?

Here is what I am getting from GetCanonicalMediaNames for my "TIFF Version 6 (CCITT G4 2D Compression).pc3" device:

  UserDefinedRaster (12906.00 x 8640.00Pixels)

  UserDefinedRaster (8640.00 x 6912.00Pixels)

  UserDefinedRaster (4896.00 x 6336.00Pixels)

  UserDefinedRaster (3168.00 x 2448.00Pixels)

  UserDefinedRaster (7776.00 x 5184.00Pixels)

  UserDefinedRaster (6336.00 x 4896.00Pixels)

  UserDefinedRaster (9072.00 x 6480.00Pixels)

  Sun_Hi-Res_(1600.00_x_1280.00_Pixels)

  XGA_Hi-Res_(1600.00_x_1200.00_Pixels)

  etc.

[Anonymous · Accepted solution]

Coop,

Use vla-GetLocaleMediaName to get the paper sizes as you have saved them for the printer.

I use the following code:

;gets the paper sizes for the plotter/layout
    (setq canon_size (vlax-safearray->list(vlax-variant-value(vla-GetCanonicalMediaNames (alay)))))
 
    ;gets the local paper sizes for the printer
      (foreach ps canon_size
        (setq paper_size (cons (vla-GetLocaleMediaName (alay) ps) paper_size))
    );end for

where (alay) is the current active layout, paper_size will be a list containing all of the paper as you have named them.