Flutter exception: Invalid image data using Image.memory() - mysql

Question

I am trying to get image from MySQL and display using 'Image.memory' in flutter, but there is exception saying invalid image data:
E/FlutterJNI(12873): Failed to decode image
E/FlutterJNI(12873): android.graphics.ImageDecoder$DecodeException: Failed to create image decoder with message 'unimplemented'Input contained an error.
E/FlutterJNI(12873): at android.graphics.ImageDecoder.nCreate(Native Method)
E/FlutterJNI(12873): at android.graphics.ImageDecoder.access$200(ImageDecoder.java:173)
E/FlutterJNI(12873): at android.graphics.ImageDecoder$ByteBufferSource.createImageDecoder(ImageDecoder.java:250)
E/FlutterJNI(12873): at android.graphics.ImageDecoder.decodeBitmapImpl(ImageDecoder.java:1862)
E/FlutterJNI(12873): at android.graphics.ImageDecoder.decodeBitmap(ImageDecoder.java:1855)
E/FlutterJNI(12873): at io.flutter.embedding.engine.FlutterJNI.decodeImage(FlutterJNI.java:431)
Reloaded 1 of 675 libraries in 750ms.
======== Exception caught by image resource service ================================================
The following _Exception was thrown resolving an image codec:
Exception: Invalid image data
Below is my main.dart, when I run the code, the screen shows invalid image data:
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'mysql.dart';
import 'dart:convert';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter and Mysql Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
String title ='';
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
var db = new Mysql();
var ques = '';
void _getCustomer() {
db.getConnection().then((conn) {
String sql = 'select question from quiz where quizID =1;';
conn.query(sql).then((results) {
for(var row in results){
setState(() {
ques = row[0]; //<=Here
});
}
});
conn.close();
});
}
#override
Widget build(BuildContext context) {
Uint8List code=base64Decode(ques);
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
child:Image.memory(base64.decode('ques')),
),
/*Text(
'$ques',
),*/
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _getCustomer,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
This is the output:(https://i.stack.imgur.com/ca32r.png)
When I change the ques = row[0] to ques=row['question'].toString(), the output different and another exception comes out:
Invalid character (at character 1)
Has anyone run into the same problem? I would appreciate if you could help