Flutter打印机管理插件pos_printer_manager的使用
Flutter打印机管理插件pos_printer_manager
的使用
此插件允许开发者通过ESC打印机无线或蓝牙打印(目前仅支持Android)。该插件提供了简便的方法来列出这些打印机。
示例
蓝牙打印机
_scan() async {
print("scan");
setState(() {
_isLoading = true;
_printers = [];
});
var printers = await BluetoothPrinterManager.discover();
print(printers);
setState(() {
_isLoading = false;
_printers = printers;
});
}
_connect(BluetoothPrinter printer) async {
var paperSize = PaperSize.mm80;
var profile = await CapabilityProfile.load();
var manager = BluetoothPrinterManager(printer, paperSize, profile);
await manager.connect();
print(" -==== connected =====- ");
setState(() {
_manager = manager;
printer.connected = true;
});
}
_startPrinter() async {
final content = Demo.getShortReceiptContent();
var bytes = await WebcontentConverter.contentToImage(content: content);
var service = ESCPrinterService(bytes);
var data = await service.getBytes(paperSize: PaperSize.mm58);
if (_manager != null) {
print("isConnected ${_manager.isConnected}");
_manager.writeBytes(data, isDisconnect: false);
}
}
网络打印机
_scan() async {
setState(() {
_isLoading = true;
_printers = [];
});
var printers = await NetworkPrinterManager.discover();
setState(() {
_isLoading = false;
_printers = printers;
});
}
_connect(NetWorkPrinter printer) async {
var paperSize = PaperSize.mm80;
var profile = await CapabilityProfile.load();
var manager = NetworkPrinterManager(printer, paperSize, profile);
await manager.connect();
setState(() {
_manager = manager;
printer.connected = true;
});
}
_startPrinter() async {
if (_data.isEmpty) {
final content = Demo.getShortReceiptContent();
var bytes = await WebcontentConverter.contentToImage(
content: content,
executablePath: WebViewHelper.executablePath(),
);
var service = ESCPrinterService(bytes);
var data = await service.getBytes();
if (mounted) setState(() => _data = data);
}
if (_manager != null) {
print("isConnected ${_manager.isConnected}");
_manager.writeBytes(_data, isDisconnect: false);
}
}
USB打印机
_scan() async {
setState(() {
_isLoading = true;
_printers = [];
});
var printers = await USBPrinterManager.discover();
setState(() {
_isLoading = false;
_printers = printers;
});
}
_connect(USBPrinter printer) async {
var paperSize = PaperSize.mm80;
var profile = await CapabilityProfile.load();
var manager = USBPrinterManager(printer, paperSize, profile);
await manager.connect();
setState(() {
_manager = manager;
printer.connected = true;
});
}
_startPrinter() async {
if (_data.isEmpty) {
final content = Demo.getShortReceiptContent();
var bytes = await WebcontentConverter.contentToImage(
content: content,
executablePath: WebViewHelper.executablePath(),
);
var service = ESCPrinterService(bytes);
var data = await service.getBytes();
if (mounted) setState(() => _data = data);
}
if (_manager != null) {
print("isConnected ${_manager.isConnected}");
_manager.writeBytes(_data, isDisconnect: false);
}
}
支持的设备
设备 | 网络 | 蓝牙 | USB |
---|---|---|---|
Android | ✓ | ✓ | ✓ |
IOS | ✓ | ✓ | ✗ |
Macos | ✓ | ✗ | ✗ |
Windows | ✓ | ✗ | ✓ |
Linux | ✓ | ✗ | ✗ |
注:USB功能将计划在下一个版本中更新。
入门指南
flutter pub add pos_printer_manager
感谢以下插件:
完整示例Demo
您可以查看以下链接中的完整示例代码:
以下是完整的示例代码:
import 'package:flutter/material.dart';
import 'package:pos_printer_manager/pos_printer_manager.dart';
import 'package:pos_printer_manager_example/home_screen.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
/// 确保打印机配置已加载
await CapabilityProfile.ensureProfileLoaded();
print("ensured");
runApp(MyApp());
}
class MyApp extends StatefulWidget {
[@override](/user/override)
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(home: HomeScreen());
}
}
更多关于Flutter打印机管理插件pos_printer_manager的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter打印机管理插件pos_printer_manager的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
pos_printer_manager
是一个用于在 Flutter 应用中管理 POS 打印机的插件。它支持通过蓝牙、Wi-Fi 和 USB 连接打印机,并且可以与各种 POS 打印机品牌兼容。以下是如何使用 pos_printer_manager
插件的详细步骤。
1. 添加依赖
首先,在 pubspec.yaml
文件中添加 pos_printer_manager
插件的依赖:
dependencies:
flutter:
sdk: flutter
pos_printer_manager: ^0.0.1 # 请确认最新版本
然后运行 flutter pub get
以安装依赖。
2. 导入插件
在你需要使用打印功能的 Dart 文件中导入插件:
import 'package:pos_printer_manager/pos_printer_manager.dart';
3. 初始化打印机管理器
在使用打印机功能之前,建议先初始化打印机管理器:
void initPrinterManager() async {
await PosPrinterManager.init();
}
4. 扫描并连接打印机
你可以通过蓝牙、Wi-Fi 或 USB 扫描并连接打印机。以下是一个通过蓝牙连接打印机的示例:
void scanAndConnectPrinter() async {
// 扫描蓝牙设备
List<BluetoothDevice> devices = await PosPrinterManager.scanBluetoothDevices();
if (devices.isEmpty) {
print('未找到蓝牙打印机');
return;
}
// 选择第一个设备进行连接
BluetoothDevice device = devices[0];
// 连接打印机
bool connected = await PosPrinterManager.connectBluetoothPrinter(device);
if (connected) {
print('打印机连接成功');
} else {
print('打印机连接失败');
}
}
5. 打印内容
连接成功后,你可以发送打印任务。以下是一个简单的打印示例:
void printContent() async {
String content = '''
============================
欢迎使用POS打印机
订单号: 123456
金额: $100.00
============================
''';
// 发送打印任务
await PosPrinterManager.printText(content);
print('打印任务已发送');
}
6. 断开连接
在完成打印任务后,建议断开与打印机的连接:
void disconnectPrinter() async {
await PosPrinterManager.disconnectPrinter();
print('打印机已断开');
}
7. 处理权限
在使用蓝牙或 Wi-Fi 连接打印机时,可能需要处理相关的权限。确保在 AndroidManifest.xml
和 Info.plist
中添加必要的权限。
8. 错误处理
在实际使用中,建议添加错误处理逻辑,以应对可能出现的连接失败、打印失败等情况。
完整示例
以下是一个完整的示例,展示如何初始化、扫描、连接、打印和断开打印机:
import 'package:flutter/material.dart';
import 'package:pos_printer_manager/pos_printer_manager.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: PrinterScreen(),
);
}
}
class PrinterScreen extends StatefulWidget {
[@override](/user/override)
_PrinterScreenState createState() => _PrinterScreenState();
}
class _PrinterScreenState extends State<PrinterScreen> {
[@override](/user/override)
void initState() {
super.initState();
initPrinterManager();
}
void initPrinterManager() async {
await PosPrinterManager.init();
}
void scanAndConnectPrinter() async {
List<BluetoothDevice> devices = await PosPrinterManager.scanBluetoothDevices();
if (devices.isEmpty) {
print('未找到蓝牙打印机');
return;
}
BluetoothDevice device = devices[0];
bool connected = await PosPrinterManager.connectBluetoothPrinter(device);
if (connected) {
print('打印机连接成功');
} else {
print('打印机连接失败');
}
}
void printContent() async {
String content = '''
============================
欢迎使用POS打印机
订单号: 123456
金额: $100.00
============================
''';
await PosPrinterManager.printText(content);
print('打印任务已发送');
}
void disconnectPrinter() async {
await PosPrinterManager.disconnectPrinter();
print('打印机已断开');
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('POS打印机管理'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton(
onPressed: scanAndConnectPrinter,
child: Text('扫描并连接打印机'),
),
SizedBox(height: 20),
ElevatedButton(
onPressed: printContent,
child: Text('打印内容'),
),
SizedBox(height: 20),
ElevatedButton(
onPressed: disconnectPrinter,
child: Text('断开打印机'),
),
],
),
),
);
}
}