Export Signature to PDF

[mame306]

Hi,

I want to export the signature to a pdf file. Is it possible to do that? And how could I implement it?

Thanks for helping me

[bdlukaa]

You can do this just by saving a file with the extension .pdf.

See this stackoverflow answer

[MartinHlavna]

Hi,

1. SignatureController allows you to export signature as pdf image by calling toPngBytes()
2. If you want to save signature to pdf file you have to create it. pdf package is great way to implement it.

Quick idea (i have not tested it, there may be errors, but it should point you to right direction):

import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
//...

var pngBytes = signatureController.toPngBytes();
final pdf = pw.Document();
final image = pw.MemoryImage(
  pngBytes,
);

pdf.addPage(pw.Page(build: (pw.Context context) {
  return pw.Center(
    child: pw.Image(image),
  ); // Center
})); // Page

// On Flutter, use the [path_provider](https://pub.dev/packages/path_provider) library:
final output = await getTemporaryDirectory();
final file = File("${output.path}/example.pdf");
await file.writeAsBytes(await pdf.save());