我正在开发一个Flutter应用程序，可以上传到PostgreSQL数据库并从中获取数据。我使用pubspec.yaml文件中的postgres：^2.3.2。
首先，我将图像转换为base64。然后，我将图像作为BYTEA上传到数据库。
当我从数据库中查询图像数据时，它为我提供了一个整数列表。我搜索了一下网页，发现我必须将该列表转换为Uint8List。将其转换为Uint8List后，我必须使用Image.memory方法将Uint8List转换为图像小部件。但是当我这样做时，我在控制台上得到了这个错误：

═══════ Exception caught by image resource service ════════════════════════════
The following _Exception was thrown resolving an image codec:
Exception: Invalid image data

When the exception was thrown, this was the stack
#0      _futurize (dart:ui/painting.dart:5326:5)
#1      ImageDescriptor.encoded (dart:ui/painting.dart:5194:12)
#2      instantiateImageCodec (dart:ui/painting.dart:2048:60)
<asynchronous suspension>
════════════════════════════════════════════════════════════════════════════════

字符串
设备上的图像：Device screenshot
代码如下：

import 'dart:typed_data';
import 'package:flutter/material.dart';

class ShowImage extends StatefulWidget {
  const ShowImage({Key? key}) : super(key: key);

  @override
  _ShowImageState createState() => _ShowImageState();
}

class _ShowImageState extends State<ShowImage> {
  dynamic _image;
  Map data = {};

  void setImage() async {
    GetImage getImgObj = GetImage(connection: data['connection']);

    dynamic imgBytes = await getImgObj.getImage();

    print(imgBytes.runtimeType);

    setState(() {
      _image = Image.memory(imgBytes);
    });
  }

  @override
  Widget build(BuildContext context) {
    data = ModalRoute.of(context)!.settings.arguments as Map;

    // setImage();

    return Scaffold(
      appBar: AppBar(
        title: Text("Show Image"),
        centerTitle: true,
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(18.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              ElevatedButton(
                onPressed: () {
                  setImage();
                },
                child: Text("Get Image"),
              ),
              SizedBox(height: 10.0),
              Container(
                width: 100,
                height: 350,
                decoration:
                    BoxDecoration(border: Border.all(color: Colors.grey)),
                child: _image == null
                    ? Align(
                        alignment: Alignment.center,
                        child: Text(
                          "Image not selected",
                          textAlign: TextAlign.center,
                        ),
                      )
                    : Align(
                        alignment: Alignment.center,
                        child: _image,
                      ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class GetImage {
  var connection;

  GetImage({this.connection});

  Future<dynamic> getImage() async {
    int itemId = 1;
    String query = "SELECT img FROM lawbreach WHERE lid = $itemId;";

    List<dynamic> results = await this.connection.query(query);

    final bytes = Uint8List.fromList(results[0][0]);

    return bytes;
  }
}

型
我试着搜索网络的每一个角落，但找不到任何解决方案。希望，这里有人能回答我的问题：）