image printing issue

[rizwanbao]

hi.. [C]" + PrinterTextParserImg.bitmapToHexadecimalString(printer, this.getApplicationContext().getResources().getDrawableForDensity(R.drawable.logo, DisplayMetrics.DENSITY_MEDIUM))+"\n" ReferenceError: PrinterTextParserImg is not defined this above code not working not getting or picking image and print can you please share some example of how to printer read the images

[patrickbussmann]

This is a example of my code.

async urlToBase64(printer, url: string): Promise<string> {
  const imageFile = await lastValueFrom(
    this.http.get(url, { responseType: 'blob' })
  );
  const base64: string = await new Promise((resolve) => {
    const reader = new FileReader();
    reader.onloadend = () => {
      resolve(reader.result as string);
    };
    reader.readAsDataURL(imageFile);
  });
  return await new Promise((resolve, reject) =>
    ThermalPrinter.bitmapToHexadecimalString(
      {
        type: printer.connectionType,
        id: printer.productName || printer.name,
        base64
      },
      resolve,
      reject
    )
  );
}

Its from angular. So in theory you can understand how it works.

Reading the file you want to print as base64 and then convert it to hex-string.

Then you can embed it in the string like:

[C]" + PrinterTextParserImg.bitmapToHexadecimalString(printer, this.getApplicationContext().getResources().getDrawableForDensity(R.drawable.logo, DisplayMetrics.DENSITY_MEDIUM))+"\n"

==

"[C]" + (await this.urlToBase64(printer, 'URL-to-Image')) + "\n"

[rizwanbao]

thats great thanks