ldd_bmp 0.1.0

将图像转换成标签打印机能识别的bmp图像,它是 1 位深度的

example/lib/main.dart

import 'dart:io';
import 'dart:typed_data';
import "package:image_picker/image_picker.dart";
import 'package:flutter/material.dart';
import 'package:ldd_bmp/api/entitys.dart';
import 'package:ldd_bmp/api/image.dart';
import 'package:ldd_bmp/ldd_bmp.dart';
import 'dart:async';


const reSize = ResizeOpt(
  width: 200,
  height: 200,
  filter: LddFilterType.nearest,
);

Future<void> main() async {
  await bmpSdkInit();
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  File? file;
  Uint8List? bmpData;
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Native Packages'),
        ),
        body: SingleChildScrollView(
          child: Column(
            children: [
              FilledButton(onPressed: selectFile, child: const Text('选择文件')),
              if (file != null)
                Image.file(
                  file!,
                  width: 200,
                  height: 200,
                ),
              ElevatedButton(
                  onPressed: file == null
                      ? null
                      : () async {
                          final bts = await file!.readAsBytes();
                          bmpData = await convertTo1BitBmp(
                              inputData: bts,
                              imageType: LddImageType.jpeg,
                              isApplyOrderedDithering: false,
                              resize: const ResizeOpt(
                                width: 200,
                                height: 200,
                                filter: LddFilterType.nearest,
                              ));
                          setState(() {});
                        },
                  child: const Text("转换")),
              ElevatedButton(
                  onPressed: bmpData == null
                      ? null
                      : () {
                          saveImageToFile(bmpData!);
                        },
                  child: const Text("保存图片")),
              Text("转换结果"),
              if(bmpData!=null)
                Image.memory(bmpData!)
            ],
          ),
        ),
        // floatingActionButton: bmpData != null
        //     ? ConstrainedBox(
        //         constraints:
        //             const BoxConstraints(maxHeight: 300, maxWidth: 300),
        //         child: Card(
        //           elevation: 10,
        //           child: Padding(
        //             padding: const EdgeInsets.all(8.0),
        //             child: Column(
        //               children: [
        //                 const Text('转换结果'),
        //                 Image.memory(bmpData!),
        //               ],
        //             ),
        //           ),
        //         ),
        //       )
        //     : null,
      ),
    );
  }

  Future<void> selectFile() async {
    setState(() {
      file = null;
    });
    final ImagePicker picker = ImagePicker();
    final xfile = await picker.pickImage(source: ImageSource.gallery);
    if(xfile!=null){
      setState(() {
        file = File(xfile.path);
      });
    }
  }
}

Future<void> saveImageToFile(Uint8List imageData) async {
  // 获取应用程序的文档目录
  // final directory = await getApplicationDocumentsDirectory();
  //
  // // 设置文件路径和文件名
  // final filePath = '${directory.path}/image.bmp';
  //
  // // 创建一个文件对象
  // final file = File(filePath);
  //
  // // 将Uint8List数据写入文件
  // await file.writeAsBytes(imageData);
  //
  // print('Image saved to $filePath');
}