jsBarcode Command Line Wrapper

This is a simple command line wrapper for the jsBarcode JavaScript library.

It accepts three properties: --value, --options, and --codec.

• --value accepts a string as the barcode value (REQUIRED)

• --codec accepts a string specifying either "png" or "svg". If "png" is specified, a base64 string will be returned. If "svg" is specified, an svg string will be returned. (REQUIRED)

• --options accepts a stringified JSON object containing any or all of the options defined here. (OPTIONAL)

The result is outputted to stdout, while any errors are outputted to stderr.

Installation and Running

To run the project, first run the commmand:

npm install

pkg must be installed globally in order to package the project into an executable binary. The command for this is:

npm install pkg -g

To package the project, run the command:

npm run build

Modify the pkg options as needed within package.json.

pkg is unable to compile Sharp's additional required binaries into the executable, so specific files and folders from node_modules need to be moved to be next to the executable on the target machine. Sharp binaries for Windows are already included in this repository , in a folder named sharp.

Examples

node index.js --value="123456789" --codec="svg"

node index.js --value="987654321" --options="{\"width\": 30, \"height\": 15}" --codec="png"

Running the executable follows the same pattern.

Usage in 4D

As a 4D Developer I call this from a method in my database that is run at server.

JS_Barcode(bracodeValue;optionsObject;codec) - Function returns an image (currently doing nothing with the err out)

C_TEXT($1; $3; $vt_path; $vt_script; $dqt)
C_OBJECT($2)
C_PICTURE($0; $vg_pict)
C_BLOB($vx_in; $vx_out; $vx_err; $vx_pict)
$dqt:=Char(Double quote)

$vt_barcode:=$dqt+$1+$dqt
$vt_barcodeParams:=$dqt+Replace string(JSON Stringify($2); $dqt; ("\\"+$dqt))+$dqt
$vt_codec:="svg" //Default Codec
If (Count parameters>2)
	$vt_codec:=$3
End if 
$vt_path:=Get 4D folder(HTML Root folder)+"jsBarcode"+Folder separator  //Set your own folder to store the .exe
$vt_script:=$vt_path+"jsbarcodecmd.exe --value="+$vt_barcode+" --options="+$vt_barcodeParams+" --codec="+$vt_codec

SET ENVIRONMENT VARIABLE("_4D_OPTION_HIDE_CONSOLE"; "true")
SET ENVIRONMENT VARIABLE("_4D_OPTION_BLOCKING_EXTERNAL_PROCESS"; "true")
LAUNCH EXTERNAL PROCESS($vt_script; $vx_in; $vx_out; $vx_err)
BASE64 DECODE($vx_out; $vx_pict)
BLOB TO PICTURE($vx_pict; $vg_pict; ("."+$vt_codec))
$0:=$vg_pict

/*Options for reference
	format        "auto"(CODE128)   String (CODE128, EAN13 / UPC; CODE39; ITF-14, MSI, Pharmacode, Codabar)
	width         2                 Number
	height        100               Number
	displayValue  true              Boolean
	text          undefined         String
	fontOptions   ""                String
	font          "monospace"       String
	textAlign     "center"          String
	textPosition  "bottom"          String
	textMargin    2                 Number
	fontSize      20                Number
	background    "#ffffff"         String (CSS color)
	lineColor     "#000000"         String (CSS color)
	margin        10                Number
	marginTop     undefined         Number
	marginBottom  undefined         Number
	marginLeft    undefined         Number
	marginRight   undefined         Number
	flat          false             Boolean
	valid         function(valid){} Function
*/