Printing Image with Bluetooth Printer in Flutter - flutter

Question

I want to print the screenshot image of first page in Flutter. So far I have come up to the part where I need to parse that image into function that would print it, here is the code:
FIRST PAGE
_screenshot() {
screenshotController.capture().then((File image) {
//Capture Done
setState(() {
_screenshot = image;
});
print('Successful Screenshot => $_screenshot');
Navigator.push(
context, MaterialPageRoute(builder: (context) => Print(_screenshot)));}
So this is the page that screenshots that whole page and pushes that screenshot to the second screen. Here is the second screen:
SECOND PAGE
class Print extends StatefulWidget {
final File screenshot;
Print(this.screenshot);
#override
_PrintState createState() => _PrintState();
}
Here I initialize that image from the first page, and then I created the function for printing that should print the ticket, but I am getting an error:
Future<Ticket> _ticket(PaperSize paper) async {
final ticket = Ticket(paper);
//this is a working option, but I don't want to load from assets, but load screenshot file from first page
//final ByteData data = await rootBundle.load(assets/store.png');
final File img = await rootBundle.load(widget.screenshot); //here parse the image from first page **ERROR HERE**
final Uint8List bytes = data.buffer.asUint8List();
final Image image = decodeImage(bytes);
ticket.image(image);
return ticket;
}
I am getting an error that Byte data cannot be assigned to variable type File which I understand, but how would I go around making this work? I am using the esc_pos_bluetooth: ^0.2.8 library for bluetooth printing.

Answer 1

You don't need to load data from rootBundle instead, you can use readAsBytes() class method from File class which returns Uint8List.
Uint8List bytes = await widget.screenshot.readAsBytes();
Your final code should look like.
Future<Ticket> _ticket(PaperSize paper) async {
final ticket = Ticket(paper);
final Uint8List bytes = await widget.screenshot.readAsBytes();
final Image image = decodeImage(bytes);
ticket.image(image);
return ticket;
}