How to save pdf file in flutter?

Question

I have a pdf file. I want to write that file in phone memory? Below is the code. First I am scanning then I am converting the image to pdf, Now I want to save that pdf to phone memory. Please help me.

  void onDocumentScanner(BuildContext context) async {
try {
  File scannedDocumentFile;
  var doc = await DocumentScannerFlutter.launchForPdf(context);
  if (doc != null) {
    refreshDownloadedFiles();
    scannedDocumentFile = doc;
    String fileName = basename(scannedDocumentFile.path);
    final directory = (await getExternalStorageDirectory())!.path;
    File saveFilePath = File('$directory/$fileName');
    saveFilePath.openWrite(); //Here I want to save to the file

    print("Path = $fileName");
    Get.toNamed(AppRoutes.viewDownloadedFile,
            arguments: [scannedDocumentFile.path, fileName, folderId])!
        .whenComplete(() {
      refreshFetchedData();
    });
  }
} catch (e) {
  print(e);
}

}

Solution

I haven't seen the .openWrite() method before, but the documentation says that it has 2 named arguments FileMode and encoding - try to specify them. If it won't work, I can only share my solution, with .writeAsBytes method. Instead of saveFilePath.openWrite() you can bundle the data first and then save it.

final byteData = await rootBundle.load(fileName);
await saveFilePath.writeAsBytes(byteData.buffer
          .asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));