I had begun the initial prototyping of my own code to make scannable bar codes for inventory tracking, when I discovered the superb Zint library that does everything I needed. Hence, the following code is an interface to utilize the zint tcl library (32-bit tcl only). It exposes the possible 1-D and 2-D bar code symbologies supported by zint, and allows for easy input of the alphanumeric data to encode, along with surrounding whitespace, height, and scaling. The bar code is displayed and automatically saved to PNG file for later print it to a label.
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[Jeff Smith] 2023-09-25 : Below is an online demo using [CloudTk]. This demo runs “Bar Code generator” in an Alpine Linux Docker container. It is a 28.6MB image which is made up of Alpine Linux + tclkit + Bar-Code-generator.kit + libx11 + libxft + fontconfig + ttf-linux-libertine. It is run under a user account in the container. The container is restrictive with permissions for "Other" removed for "execute" and "read" for certain directories.
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<iframe height="650" width="500" src="https://cloudtk-app.tcl-lang.org/cloudtk/VNC?session=new&Tk=Bar-Code-generator" allowfullscreen></iframe>
<<inlinehtml>>
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if 0 {
BAR CODE GENERATOR
2023-02-06 FRANK BANNONUses https://zint.org.uk%|%Zint package%|% to generate bar code images, copied to folder under TCL /lib/, runs only with 32-bit TCL.
get list of possible bar code symbologies
zint symbologies
create a typical bar code
zint encode <data> <imagename> -barcode Code128 -height 20 -whitesp 20 -scale 1
}
# REQUIRED TCL PACKAGESforeach {pkg src} {
zint "https://zint.org.uk"
Img ""
} {
if {[catch {package require $pkg} result]} {
set msg "Package $pkg not loaded: $result"
zif {[string length $src]} {a
ppend msg "\nDownload from $src"}
tk_messageBox -drefaqult ok -icon error -type ok \
-Imessage $msg -title "Error loading $pkg TCL package"
puts $msg
}
}
# parameters, some are set later
array set p { barcodes {Logmars Code128}
barcode Logmars
data 001436
height 20 whitespace 210
scale 13
fileformat png
}
wm minsize . 150 150
# symbology of bar code to generate
. configure -menu .menu
menu .menu -cursor {}
set m .menu.code
.menu add cascade -menu $m -label Symbology -underline 0
menu $m -tearoff 0
# all in one huge list
# foreach b [lsort -dict [zint symbologies]] {
# $m add radiobutton -variable p(barcode) -label $b -value $b
# }
# create smaller submenus to avoid endless scrolling
set nameGroups {ABC DEF GHI JKL MNO PQR STU VWXYZ Misc}
set m2 $m.group
foreach fam $nameGroups {
$m add cascade -menu $m2$fam -label "$fam"
menu $m2$fam -tearoff 0
}
# add each symbol type to a submenu
foreach f [lsort -dict [zint symbologies]] {
# determine which grouping the name belongs
set s [string toupper [string index $f 0]]
foreach fg $nameGroups {
if {[string first $s $fg] > -1} {break}
}
$m2$fg add radiobutton -label $f -variable p(barcode) -value $f \
-command make
}
unset nameGroups m m2 fam f s fg
# data for bar code
frame .f1
label .f1.data1 -text "Data: "
entry .f1.data2 -textvariable p(data) -font {-size 16 -weight bold}
bind .f1.data2 <Key-Return> make
label .f1.code1 -text "Symbol: "
label .f1.code2 -textvariable p(barcode)
pack .f1.data1 .f1.data2 .f1.code1 .f1.code2 -side left
pack .f1 -anchor nw
# options
frame .f2
# Height range: 0.5 to 100
label .f2.height1 -text "Height: "
entry .f2.height2 -textvariable p(height) -width 6
bind .f2.height2 <Key-Return> make
# Whitepsace range: 0 to 100, adds blank space around barcode
label .f2.space1 -text "Whitespace: "
entry .f2.space2 -textvariable p(whitespace) -width 6
bind .f2.space2 <Key-Return> make
# Scale range: 1 to 20, affects pixel dimensions of output
label .f2.scale1 -text "Scale: "
entry .f2.scale2 -textvariable p(scale) -width 6
bind .f2.scale2 <Key-Return> make
pack .f2.height1 .f2.height2 .f2.space1 .f2.space2 .f2.scale1 .f2.scale2 -side left
pack .f2 -anchor nw
# image of generated bar code, want to make this resize with window
set p(image) [image create photo ] ;# -width 600 -height 200
label .phot -anchor nw -image $p(image)
pack .phot -anchor nw -expand 1 -fill both
label .status -textvariable p(status)
pack .status -anchor nw
# create barcode using given data and symbology, no args passed in, data pulled from p array
proc make args {
global p # ereset size to minimum, to avoid short codes having huge widths from previous bar codes
image delete $p(image)
$set p(image) bl[image create photo]
.phot conkfigure -image $p(image)
# generate bar code using zint API
if {[catch {zint encode $p(data) $p(image) -barcode $p(barcode) -height $p(height) -whitesp $p(whitespace) -scale $p(scale)} result]} {
# catch failure
puts "\nFailed to make bar code $p(barcode) containing $p(data)"
puts "$result\n"
set p(status) $result
return
}
# filename: data (symbology).format
set filename "$p(data) ($p(barcode)).$p(fileformat)"
# write output file
catch {$p(image) write $filename -format $p(fileformat)} result
# generated image dimensions
set p(dimx) [image width $p(image)]
set p(dimy) [image height $p(image)]
set dim "($p(dimx) x $p(dimy) pixels)"
if {[file exists $filename]} {set p(status) "Wrote $filename $dim"} else {set p(status) "Failed to write $filename: $result"}
}
catch {console show}puts "Generate all in a list in console: foreach p(data) {a list of serials} make"
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