psdk #

Flutter USB通信插件psdk_usb_windows的使用

简介

psdk_usb_windows 是一个用于在 Flutter 应用程序中进行 USB 通信的插件。通过此插件，您可以与 USB 设备进行数据交换。本文将详细介绍如何安装和使用该插件，并提供一个简单的示例来展示其基本功能。

安装插件

首先，在 pubspec.yaml 文件中添加 psdk_usb_windows 依赖项：

dependencies:
  flutter:
    sdk: flutter
  psdk_usb_windows: ^1.0.0

然后运行 flutter pub get 命令以安装插件。

初始化插件

在您的 Flutter 项目中，创建一个新的 Dart 文件（例如 main.dart），并在其中初始化和使用 psdk_usb_windows 插件。

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('USB Communication Example'),
        ),
        body: Center(
          child: USBCommunicationExample(),
        ),
      ),
    );
  }
}

class USBCommunicationExample extends StatefulWidget {
  [@override](/user/override)
  _USBCommunicationExampleState createState() => _USBCommunicationExampleState();
}

class _USBCommunicationExampleState extends State<USBCommunicationExample> {
  UsbDeviceManager _usbDeviceManager;
  List<UsbDeviceInfo> _devices = [];
  String _message = '';

  [@override](/user/override)
  void initState() {
    super.initState();
    _usbDeviceManager = UsbDeviceManager();
    _usbDeviceManager.onDeviceAdded.listen((deviceInfo) {
      setState(() {
        _devices.add(deviceInfo);
      });
    });

    _usbDeviceManager.onDeviceRemoved.listen((deviceInfo) {
      setState(() {
        _devices.removeWhere((element) => element.deviceName == deviceInfo.deviceName);
      });
    });

    // 开始扫描USB设备
    _usbDeviceManager.startScan();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        ElevatedButton(
          onPressed: () async {
            if (_devices.isNotEmpty) {
              final device = _devices.first;
              final connection = await _usbDeviceManager.connect(device);
              if (connection != null) {
                final response = await connection.sendData([0x01, 0x02, 0x03]);
                setState(() {
                  _message = 'Received data: ${response.toString()}';
                });
              } else {
                setState(() {
                  _message = 'Failed to connect to the device';
                });
              }
            } else {
              setState(() {
                _message = 'No devices found';
              });
            }
          },
          child: Text('Send Data to Device'),
        ),
        SizedBox(height: 20),
        Text(_message),
      ],
    );
  }
}