How to encode a PDF to a binary in Flutter - sqlite

Question

I am trying to make an document scanner app in flutter where whenever a user clicks a button the PDF that is already created should be added to an SQLite database .For uploading a PDF into a SQLite database in flutter we need to convert the file to a binary.But I don't know how to do that please help me.The code for converting a image to a pdf
String _status = "Not created";
File pdfFile;
FileStat _pdfStat;
bool _generating = false;
Future<File> _assetFromBundle(String name) async {
final tempDir = await getApplicationDocumentsDirectory();
final output = File(path.join(tempDir.path, name));
if (!await output.exists()) {
final data = await rootBundle.load('assets/$name');
final buffer = data.buffer;
output.writeAsBytes(
buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
}
return output;
}
Future<void> _createPdf() async {
try {
this.setState(() => _generating = true);
final tempDir = await getApplicationDocumentsDirectory();
final output = File(path.join(tempDir.path, 'example.pdf'));
this.setState(() => _status = 'Preparing images...');
final images = [ff.image];
this.setState(() => _status = 'Generating PDF');
await ImagesToPdf.createPdf(
pages: images
.map(
(file) => PdfPage(
imageFile: file,
compressionQuality: 0.5,
) ,
)
.toList(),
output: output,
);
_pdfStat = await output.stat();
this.setState(() {
pdfFile = output;
_status = 'PDF Generated (${_pdfStat.size ~/ 1024}kb)';
});
} catch (e) {
this.setState(() => _status = 'Failed to generate pdf: $e".');
} finally {
this.setState(() => _generating = false);
}
}
Future<void> _openPdf() async {
if (pdfFile != null) {
try {
final bytes = await pdfFile.readAsBytes();
await Printing.sharePdf(
bytes: bytes, filename: path.basename(pdfFile.path));
} catch (e) {
_status = 'Failed to open pdf: $e".';
}
}
}

Answer 1

I guess what you are looking for is bytes, use File class to read as bytes,
var f = File('file/path.pdf');
List<int> binaries = await f.readAsBytes();
use the bytes as is or by encoding it to Base64 String
var asString = Base64Codec().encode(binaries);