Comment line in ZPL code

Question

I want to comment lines in the ZPL code, for example:

^XA
^MMT
^LL0531
^PW1280
^LS0
^FT81,528^A0B,29,28^FH\^FDTEXT^FS               
// ^FT336,495^A0B,29,33^FH\^FDEAN^FS^FX         ----
//^BY3,2,42^FT384,492^BEB,,Y,N                  Commented lines
//^FD789690466123^FS                            ----
^PQ1,0,1,Y^XZ

I want this because sometimes my variable is null and do not want to print the barcode. This is possible? or what the best way to not print the barcode?

Answer 1

The short answer is "Can't be done."

The comment-indicator is ^FX after which characters are ignored - but end-of-comment is any ^ or ~ command which makes ^FX next to useless.

Unless there has been a "block-comment" command added, with a specific start/end-block-comment mnemonic-set, then sorry - you're out-of-luck.

All is not quite lost however.

^XA
^FT336,495^A0B,29,33^FH\^FDEAN^FS^FX
^BY3,2,42^FT384,492^BEB,,Y,N
^FD789690466123^FS
^MMT
^LL0531
^PW1280
^LS0
^FT81,528^A0B,29,28^FH\^FDTEXT^FS               
^PQ1,0,1,Y^XZ

will recognise the lines-to-be-commented-out.

^FT336,495^A0B,29,33^FH\^FDEAN^FS^FX
^BY3,2,42^FT384,492^BEB,,Y,N
^FD789690466123^FS
^XA
^MMT
^LL0531
^PW1280
^LS0
^FT81,528^A0B,29,28^FH\^FDTEXT^FS               
^PQ1,0,1,Y^XZ

would ignore them, as data between ^XZ and ^XA is disregarded.