Flutter热敏打印机控制插件wiseasy_thermal_printer的使用
Flutter热敏打印机控制插件wiseasy_thermal_printer的使用
wiseasy_thermal_printer
Flutter 插件,用于访问 Wiseasy 设备打印机的原生功能。
开始使用
此项目是一个 Flutter 的插件包起点,专门包含针对 Android 和/或 iOS 的平台特定实现代码。
要开始使用 Flutter 开发,请查看 Flutter 官方文档,其中提供了教程、示例、移动开发指南以及完整的 API 参考。
示例代码
以下是一个完整的示例代码,展示如何在 Flutter 中使用 wiseasy_thermal_printer
插件来控制热敏打印机。
示例代码:example/lib/main.dart
import 'dart:ui';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:wiseasy_thermal_printer/wiseasy_thermal_printer.dart';
void main() {
// 确保插件注册器已初始化
DartPluginRegistrant.ensureInitialized();
WidgetsFlutterBinding.ensureInitialized();
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _platformVersion = 'Unknown'; // 平台版本信息
final _wiseasyThermalPrinterPlugin = WiseasyThermalPrinter(); // 初始化插件实例
[@override](/user/override)
void initState() {
super.initState();
initPlatformState(); // 初始化平台状态
}
// 初始化平台状态
Future<void> initPlatformState() async {
String platformVersion;
try {
// 获取平台版本
platformVersion =
await _wiseasyThermalPrinterPlugin.getPlatformVersion() ?? 'Unknown platform version';
} on PlatformException {
platformVersion = 'Failed to get platform version.';
}
// 如果组件未挂载,则返回
if (!mounted) return;
setState(() {
_platformVersion = platformVersion;
});
}
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Flutter Wiseasy 测试'),
),
body: Column(
children: [
// 显示当前运行的平台版本
Center(
child: Text('运行于: $_platformVersion\n'),
),
// 初始化打印机按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.initPrinter();
if (kDebugMode) {
print(res);
}
},
child: const Text("初始化打印机")),
// 打印样本收据按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.printSample();
if (kDebugMode) {
print(res);
}
},
child: const Text("打印样本收据")),
// 纸张进纸 10 单位按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.paperFeed(10);
if (kDebugMode) {
print(res);
}
},
child: const Text("纸张进纸 - 10 单位")),
// 纸张进纸 100 单位按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.paperFeed(100);
if (kDebugMode) {
print(res);
}
},
child: const Text("纸张进纸 - 100 单位")),
// 格式化打印测试按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.printLine(
"Hello GiftMe", 25, "left", false, false);
if (kDebugMode) {
print(res);
}
res = await _wiseasyThermalPrinterPlugin.printLine(
"Hello GiftMe", 35, "center", false, true);
if (kDebugMode) {
print(res);
}
res = await _wiseasyThermalPrinterPlugin.printLine(
"Hello GiftMe", 45, "right", true, false);
if (kDebugMode) {
print(res);
}
res = await _wiseasyThermalPrinterPlugin.paperFeed(100);
if (kDebugMode) {
print(res);
}
},
child: const Text("格式化打印测试")),
// 停止打印按钮
ElevatedButton(
onPressed: () async {
var res = await _wiseasyThermalPrinterPlugin.stopPrint();
if (kDebugMode) {
print(res);
}
},
child: const Text("停止打印机")),
],
),
),
);
}
}
更多关于Flutter热敏打印机控制插件wiseasy_thermal_printer的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
wiseasy_thermal_printer
是一个用于 Flutter 的热敏打印机控制插件。它可以帮助开发者在 Flutter 应用中集成热敏打印机的功能,支持蓝牙和 USB 连接的打印机。以下是如何使用 wiseasy_thermal_printer
插件的详细步骤。
1. 添加依赖
首先,在 pubspec.yaml
文件中添加 wiseasy_thermal_printer
插件的依赖:
dependencies:
flutter:
sdk: flutter
wiseasy_thermal_printer: ^1.0.0 # 请使用最新版本
然后运行 flutter pub get
以安装依赖。
2. 导入插件
在需要使用热敏打印机的 Dart 文件中导入插件:
import 'package:wiseasy_thermal_printer/wiseasy_thermal_printer.dart';
3. 初始化打印机
在使用打印机之前,需要先初始化打印机。通常可以在应用的 initState
方法中进行初始化:
ThermalPrinter thermalPrinter = ThermalPrinter();
[@override](/user/override)
void initState() {
super.initState();
thermalPrinter.init();
}
4. 连接打印机
连接打印机的方式取决于打印机的连接类型(蓝牙或 USB)。以下是连接蓝牙打印机的示例:
Future<void> connectBluetoothPrinter() async {
try {
await thermalPrinter.connectBluetooth(bluetoothAddress);
print('Printer connected successfully');
} catch (e) {
print('Failed to connect to printer: $e');
}
}
对于 USB 打印机,可以使用类似的方法:
Future<void> connectUsbPrinter() async {
try {
await thermalPrinter.connectUsb(usbDevice);
print('Printer connected successfully');
} catch (e) {
print('Failed to connect to printer: $e');
}
}
5. 打印文本
连接打印机后,可以使用 printText
方法打印文本:
Future<void> printText() async {
try {
await thermalPrinter.printText('Hello, World!');
print('Text printed successfully');
} catch (e) {
print('Failed to print text: $e');
}
}
6. 打印图像
wiseasy_thermal_printer
也支持打印图像。首先将图像转换为字节数组,然后使用 printImage
方法打印:
Future<void> printImage() async {
try {
ByteData imageData = await rootBundle.load('assets/image.png');
Uint8List imageBytes = imageData.buffer.asUint8List();
await thermalPrinter.printImage(imageBytes);
print('Image printed successfully');
} catch (e) {
print('Failed to print image: $e');
}
}
7. 断开连接
在打印完成后,应该断开与打印机的连接以释放资源:
Future<void> disconnectPrinter() async {
try {
await thermalPrinter.disconnect();
print('Printer disconnected successfully');
} catch (e) {
print('Failed to disconnect printer: $e');
}
}
8. 处理错误
在使用插件时,可能会遇到各种错误,如连接失败、打印失败等。确保在代码中捕获并处理这些错误,以提供更好的用户体验。
9. 示例代码
以下是一个完整的示例代码,展示了如何连接打印机、打印文本和图像,以及断开连接:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:wiseasy_thermal_printer/wiseasy_thermal_printer.dart';
class PrinterScreen extends StatefulWidget {
[@override](/user/override)
_PrinterScreenState createState() => _PrinterScreenState();
}
class _PrinterScreenState extends State<PrinterScreen> {
ThermalPrinter thermalPrinter = ThermalPrinter();
String bluetoothAddress = '00:11:22:33:44:55'; // 替换为实际的蓝牙地址
[@override](/user/override)
void initState() {
super.initState();
thermalPrinter.init();
}
Future<void> connectBluetoothPrinter() async {
try {
await thermalPrinter.connectBluetooth(bluetoothAddress);
print('Printer connected successfully');
} catch (e) {
print('Failed to connect to printer: $e');
}
}
Future<void> printText() async {
try {
await thermalPrinter.printText('Hello, World!');
print('Text printed successfully');
} catch (e) {
print('Failed to print text: $e');
}
}
Future<void> printImage() async {
try {
ByteData imageData = await rootBundle.load('assets/image.png');
Uint8List imageBytes = imageData.buffer.asUint8List();
await thermalPrinter.printImage(imageBytes);
print('Image printed successfully');
} catch (e) {
print('Failed to print image: $e');
}
}
Future<void> disconnectPrinter() async {
try {
await thermalPrinter.disconnect();
print('Printer disconnected successfully');
} catch (e) {
print('Failed to disconnect printer: $e');
}
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Thermal Printer Example'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
onPressed: connectBluetoothPrinter,
child: Text('Connect Printer'),
),
ElevatedButton(
onPressed: printText,
child: Text('Print Text'),
),
ElevatedButton(
onPressed: printImage,
child: Text('Print Image'),
),
ElevatedButton(
onPressed: disconnectPrinter,
child: Text('Disconnect Printer'),
),
],
),
),
);
}
}