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example/lib/main.dart

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+import 'package:flutter/material.dart';
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+import 'package:ch34/ch34.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatefulWidget {
+  const MyApp({super.key});
+
+  @override
+  State<MyApp> createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  String _platformVersion = 'Unknown';
+  List<UsbDeviceInfo> _devices = [];
+  String _status = '未连接';
+  String _receivedData = '';
+
+  @override
+  void initState() {
+    super.initState();
+    initPlatformState();
+  }
+
+  Future<void> initPlatformState() async {
+    String platformVersion;
+    try {
+      platformVersion =
+          await Ch34Manager.getPlatformVersion() ?? 'Unknown platform version';
+    } on PlatformException {
+      platformVersion = 'Failed to get platform version.';
+    }
+
+    if (!mounted) return;
+
+    setState(() {
+      _platformVersion = platformVersion;
+    });
+  }
+
+  Future<void> _scanDevices() async {
+    try {
+      final devices = await Ch34Manager.enumDevice();
+      setState(() {
+        _devices = devices;
+        _status = '发现 ${devices.length} 个设备';
+      });
+    } catch (e) {
+      setState(() {
+        _status = '扫描失败: $e';
+      });
+    }
+  }
+
+  Future<void> _openDevice(String deviceName) async {
+    try {
+      final success = await Ch34Manager.openDevice(deviceName);
+      if (success) {
+        await Ch34Manager.setSerialParameter(
+          deviceName,
+          0,
+          const SerialParameter(baud: 115200),
+        );
+
+        await Ch34Manager.registerDataCallback(
+          deviceName,
+          0,
+          (Uint8List data) {
+            final hex = data.map((b) => b.toRadixString(16).padLeft(2, '0')).join(' ');
+            setState(() {
+              _receivedData = '收到: $hex';
+            });
+          },
+        );
+
+        setState(() {
+          _status = '已连接: $deviceName';
+        });
+      } else {
+        setState(() {
+          _status = '打开失败';
+        });
+      }
+    } catch (e) {
+      setState(() {
+        _status = '连接失败: $e';
+      });
+    }
+  }
+
+  Future<void> _sendData(String deviceName) async {
+    try {
+      final data = Uint8List.fromList([0x01, 0x02, 0x03]);
+      final sent = await Ch34Manager.writeData(deviceName, 0, data);
+      setState(() {
+        _status = '已发送 $sent 字节';
+      });
+    } catch (e) {
+      setState(() {
+        _status = '发送失败: $e';
+      });
+    }
+  }
+
+  Future<void> _disconnect(String deviceName) async {
+    try {
+      Ch34Manager.removeDataCallback(deviceName);
+      await Ch34Manager.disconnect(deviceName);
+      setState(() {
+        _status = '已断开';
+      });
+    } catch (e) {
+      setState(() {
+        _status = '断开失败: $e';
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: const Text('CH34X 示例'),
+        ),
+        body: SingleChildScrollView(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text('平台版本: $_platformVersion\n'),
+              Text('状态: $_status\n'),
+              if (_receivedData.isNotEmpty)
+                Text('接收数据: $_receivedData\n'),
+              const SizedBox(height: 16),
+              ElevatedButton(
+                onPressed: _scanDevices,
+                child: const Text('扫描设备'),
+              ),
+              const SizedBox(height: 8),
+              if (_devices.isNotEmpty)
+                ListView.builder(
+                  shrinkWrap: true,
+                  physics: const NeverScrollableScrollPhysics(),
+                  itemCount: _devices.length,
+                  itemBuilder: (context, index) {
+                    final device = _devices[index];
+                    return ListTile(
+                      title: Text('${device.deviceName}'),
+                      subtitle: Text(
+                          'VID: 0x${device.vendorId.toRadixString(16).toUpperCase()} '
+                          'PID: 0x${device.productId.toRadixString(16).toUpperCase()} '
+                          '端口: ${device.serialCount}'),
+                      trailing: Row(
+                        mainAxisSize: MainAxisSize.min,
+                        children: [
+                          IconButton(
+                            icon: const Icon(Icons.power),
+                            onPressed: () => _openDevice(device.deviceName),
+                          ),
+                          IconButton(
+                            icon: const Icon(Icons.send),
+                            onPressed: _status.contains('已连接')
+                                ? () => _sendData(device.deviceName)
+                                : null,
+                          ),
+                          IconButton(
+                            icon: const Icon(Icons.power_off),
+                            onPressed: _status.contains('已连接')
+                                ? () => _disconnect(device.deviceName)
+                                : null,
+                          ),
+                        ],
+                      ),
+                    );
+                  },
+                ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}