readAsBytesSync is incomplete - flutter

Question

Since I can't convert convert a file directly from url (e.g File(url)).
I am downloading the file and then use the temp file path.
I tried different files : images, pdfs and it's still incomplete.
Am I doing something wrong here?
Future<String> downloadFile() async {
print(imgUrl);
Dio dio = Dio();
try {
var dir = await getApplicationDocumentsDirectory();
await dio.download(imgUrl, "${dir.path}/${widget.name}.pdf",
onReceiveProgress: (rec, total) {});
path = "${dir.path}/${widget.name}.pdf";
setState(() {
downloading = false;
progressString = "Completed";
});
if (path != null) {
List<int> imageBytes = File(path).readAsBytesSync();
print("NEW BYTE : $imageBytes");
}
} catch (e) {
print(e);
}
return path;
}

Answer 1

Checkout this solution:-
https://gist.github.com/Nitingadhiya/3e029e2475eeffac311ecd76f273941f
Uint8List? _documentBytes;
getPdfBytes() async {
_documentBytes = await http.readBytes(Uri.parse('https://cdn.syncfusion.com/content/PDFViewer/flutter-succinctly.pdf'));
return _documentBytes;
}
Future<void> readPDf() async {
//Load the existing PDF document.
Uint8List documentInBytes = await getPdfBytes();
final PdfDocument document = PdfDocument(inputBytes: documentInBytes);
//Get the existing PDF page.
final PdfPage page = document.pages[0];
//Draw text in the PDF page.
page.graphics.drawString('Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 12), brush: PdfSolidBrush(PdfColor(0, 0, 0)), bounds: const Rect.fromLTWH(0, 0, 150, 20));
//Save the document.
final List<int> bytes = await document.save(); //document.saveSync();
await saveAndLaunchFile(bytes, 'Invoice.pdf');
//Dispose the document.
document.dispose();
}
Future<void> saveAndLaunchFile(List<int> bytes, String fileName) async {
//Get the storage folder location using path_provider package.
String? path;
if (Platform.isAndroid || Platform.isIOS || Platform.isLinux || Platform.isWindows) {
final Directory directory = await path_provider.getApplicationSupportDirectory();
path = directory.path;
} else {
path = await PathProviderPlatform.instance.getApplicationSupportPath();
}
final File file = File(Platform.isWindows ? '$path\\$fileName' : '$path/$fileName');
await file.writeAsBytes(bytes, flush: true);
if (Platform.isAndroid || Platform.isIOS) {
//Launch the file (used open_file package)
// await open_file.OpenFile.open('$path/$fileName');
} else if (Platform.isWindows) {
await Process.run('start', <String>['$path\\$fileName'], runInShell: true);
} else if (Platform.isMacOS) {
await Process.run('open', <String>['$path/$fileName'], runInShell: true);
} else if (Platform.isLinux) {
await Process.run('xdg-open', <String>['$path/$fileName'], runInShell: true);
}
}