convert pictures to ZPL compatible ^GF-elements
The ZPLGFA Golang package implements some functions to convert PNG, JPEG and GIF encoded graphic files to ZPL compatible ^GF-elements (Graphic Fields).
If you need a ready to use application and don't want to hassle around with source code, take a look at the ZPLGFA CLI Tool which is based on this package.
- install Golang
go get simonwaldherr.de/go/zplgfa
take a look at the example application
or at this sample code:
package main
import (
"simonwaldherr.de/go/zplgfa"
"fmt"
"image"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"log"
"os"
)
func main() {
// open file
file, err := os.Open("label.png")
if err != nil {
log.Printf("Warning: could not open the file: %s\n", err)
return
}
defer file.Close()
// load image head information
config, format, err := image.DecodeConfig(file)
if err != nil {
log.Printf("Warning: image not compatible, format: %s, config: %v, error: %s\n", format, config, err)
}
// reset file pointer to the beginning of the file
file.Seek(0, 0)
// load and decode image
img, _, err := image.Decode(file)
if err != nil {
log.Printf("Warning: could not decode the file, %s\n", err)
return
}
// flatten image
flat := zplgfa.FlattenImage(img)
// convert image to zpl compatible type
gfimg := zplgfa.ConvertToZPL(flat, zplgfa.CompressedASCII)
// output zpl with graphic field data to stdout
fmt.Println(gfimg)
}If you have dozens of label printers in use and need to fill and print label templates, this tool will help you:
