Hello I am trying to print an image using the printImageBytes method, but it gives me the following error:
D/skia (18073): --- Failed to create image decoder with message 'unimplemented'
E/Print Photo error(18073): the file isn't exists
Here is the full code.
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:blue_thermal_printer/blue_thermal_printer.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:image/image.dart' as Img;
import 'package:barcode_image/barcode_image.dart' as Bcode;
class BluePrint extends StatefulWidget {
static const String id = 'blue_print';
@override
_BluePrintState createState() => new _BluePrintState();
}
class _BluePrintState extends State<BluePrint> {
BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
List<BluetoothDevice> _devices = [];
BluetoothDevice _device;
bool _connected = false;
bool _pressed = false;
String pathImage;
@override
void initState() {
super.initState();
initPlatformState();
//initSavetoPath();
}
initSavetoPath() async {
//read and write
//image max 300px X 300px
final filename = 'yourlogo.png';
var bytes = await rootBundle.load("assets/images/yourlogo.png");
String dir = (await getApplicationDocumentsDirectory()).path;
writeToFile(bytes, '$dir/$filename');
setState(() {
pathImage = '$dir/$filename';
});
}
Future<void> initPlatformState() async {
List<BluetoothDevice> devices = [];
try {
devices = await bluetooth.getBondedDevices();
} on PlatformException {
// TODO - Error
}
bluetooth.onStateChanged().listen((state) {
switch (state) {
case BlueThermalPrinter.CONNECTED:
setState(() {
_connected = true;
_pressed = false;
});
break;
case BlueThermalPrinter.DISCONNECTED:
setState(() {
_connected = false;
_pressed = false;
});
break;
default:
print(state);
break;
}
});
if (!mounted) return;
setState(() {
_devices = devices;
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Blue Thermal Printer'),
),
body: Container(
child: ListView(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 0.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Device:',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
DropdownButton(
items: _getDeviceItems(),
onChanged: (value) => setState(() => _device = value),
value: _device,
),
RaisedButton(
onPressed:
_pressed ? null : _connected ? _disconnect : _connect,
child: Text(_connected ? 'Disconnect' : 'Connect'),
),
],
),
),
Padding(
padding:
const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
child: RaisedButton(
onPressed: _connected ? _tesPrint : null,
child: Text('TesPrint'),
),
),
],
),
),
),
);
}
List<DropdownMenuItem<BluetoothDevice>> _getDeviceItems() {
List<DropdownMenuItem<BluetoothDevice>> items = [];
if (_devices.isEmpty) {
items.add(DropdownMenuItem(
child: Text('NONE'),
));
} else {
_devices.forEach((device) {
items.add(DropdownMenuItem(
child: Text(device.name),
value: device,
));
});
}
return items;
}
void _connect() {
if (_device == null) {
show('No device selected.');
} else {
bluetooth.isConnected.then((isConnected) {
if (!isConnected) {
bluetooth.connect(_device).catchError((error) {
setState(() => _pressed = false);
});
setState(() => _pressed = true);
}
});
}
}
void _disconnect() {
bluetooth.disconnect();
setState(() => _pressed = true);
}
//write to app path
Future<void> writeToFile(ByteData data, String path) {
final buffer = data.buffer;
return new File(path).writeAsBytes(
buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
}
void _tesPrint() async {
//SIZE
// 0- normal size text
// 1- only bold text
// 2- bold with medium text
// 3- bold with large text
//ALIGN
// 0- ESC_ALIGN_LEFT
// 1- ESC_ALIGN_CENTER
// 2- ESC_ALIGN_RIGHT
final img = Img.Image(300, 300);
Img.fill(img, Img.getColor(255, 255, 255));
Bcode.drawBarcode(img, Bcode.Barcode.pdf417(), 'Test');
bluetooth.isConnected.then((isConnected) {
if (isConnected) {
print(img.getBytes());
bluetooth.printCustom("HEADER", 3, 1);
bluetooth.printNewLine();
//bluetooth.printImage(pathImage);
bluetooth.printNewLine();
bluetooth.printLeftRight("LEFT", "RIGHT", 0);
bluetooth.printLeftRight("LEFT", "RIGHT", 1);
bluetooth.printNewLine();
bluetooth.printLeftRight("LEFT", "RIGHT", 2);
bluetooth.printCustom("Body left", 1, 0);
bluetooth.printCustom("Body right", 0, 2);
bluetooth.printNewLine();
bluetooth.printCustom("Terimakasih", 2, 1);
bluetooth.printNewLine();
//bluetooth.printQRcode("Insert Your Own Text to Generate", 10, 10, 0);
bluetooth.printImageBytes(img.getBytes());
bluetooth.printNewLine();
bluetooth.printNewLine();
bluetooth.printCustom("cool", 3, 1);
bluetooth.paperCut();
}
});
}
Future show(
String message, {
Duration duration: const Duration(seconds: 3),
}) async {
await new Future.delayed(new Duration(milliseconds: 100));
Scaffold.of(context).showSnackBar(
new SnackBar(
content: new Text(
message,
style: new TextStyle(
color: Colors.white,
),
),
duration: duration,
),
);
}
}
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