Flutter SDK更新管理插件cs50sdkupdate的使用
Flutter SDK更新管理插件cs50sdkupdate的使用
目录
安装
在 pubspec.yaml
文件中添加以下依赖项:
dependencies:
cs50sdkupdate: ^1.0.0
然后运行 flutter pub get
来安装包。
使用
将包导入到 Dart 代码中:
import 'package:cs50sdkupdate/cs50sdkupdate.dart';
初始化插件并在 Flutter 应用程序中使用其功能。以下是基本示例:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:cs50sdkupdate/cs50sdkupdate.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'CS50 SDK Update Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
brightness: Brightness.light,
fontFamily: 'Roboto',
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
[@override](/user/override)
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
final _cs50sdkupdatePlugin = Cs50sdkupdate();
[@override](/user/override)
void initState() {
super.initState();
}
[@override](/user/override)
Widget build(BuildContext context) {
// 构建UI
}
}
功能
初始化
初始化平台和各种组件:
- 获取平台版本:检索平台版本。
- 初始化PICC:初始化PICC。
PICC操作
与PICC相关的操作:
- 关闭PICC:关闭PICC。
- 移除PICC:移除PICC。
- PICC检查:检查PICC状态。
- 开始轮询:开始轮询PICC数据。
命令执行
执行各种系统和NFC命令:
- 执行命令:运行系统命令。
- SAM AV2初始化:初始化SAM AV2。
- 执行NFC:执行NFC命令。
打印机初始化
初始化和配置打印机:
- 初始化打印机:初始化打印机。
- 使用参数初始化:使用特定参数初始化打印机。
打印机设置
配置打印机设置:
- 设置字体:设置打印机字体。
- 设置灰度:设置打印灰度。
- 设置间距:配置间距。
- 获取字体:获取当前字体设置。
- 设置步长:设置打印步长。
- 设置电压:配置打印机电压。
- 设置充电状态:设置充电状态。
- 设置行像素:配置行像素距离。
- 设置左缩进:设置打印左缩进。
- 设置对齐方式:配置文本对齐方式。
- 设置字符间距:设置字符间距。
- 设置行间距:配置行间距。
- 设置左边距:设置打印左边距。
- 设置打印速度:配置打印速度。
- 设置打印模式:设置打印模式。
- 设置下划线:启用或禁用下划线。
- 设置反向打印:启用或禁用反向打印。
- 设置粗体打印:启用或禁用粗体打印。
打印操作
执行各种打印任务:
- 打印文本:打印文本字符串。
- 打印位图:打印位图图像。
- 打印条形码:打印条形码。
- 打印二维码:打印二维码。
- 打印带文本的二维码:打印带有文本的二维码。
- 开始打印:开始打印过程。
- 打印徽标:打印徽标。
- 打印所有文本:打印所有排队的文本。
- 打印PDF:打印PDF文件。
- 打印现有PDF:打印现有的PDF文件。
- 创建并打印简单的PDF:创建并打印简单的PDF文档。
打印机实用工具
打印机的实用工具函数:
- 检查状态:检查打印机状态。
- 进纸:通过打印机进纸。
- 定位标签:定位标签位置。
- 打印状态:显示打印状态。
示例
这是一个完整的示例,演示了各种功能:
import 'dart:io';
import 'package:cs50sdkupdate_example/pdf_printer.dart';
import 'package:cs50sdkupdate_example/print_status_screen.dart';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:cs50sdkupdate/cs50sdkupdate.dart';
import 'package:path_provider/path_provider.dart';
import 'editor.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'CS50 SDK Update Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
brightness: Brightness.light,
fontFamily: 'Roboto',
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
[@override](/user/override)
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
String _platformVersion = 'Unknown';
String _pollingData = 'No data';
String _printStatus = 'Printer not initialized';
String _piccStatus = 'PICC not initialized';
final _cs50sdkupdatePlugin = Cs50sdkupdate();
late PrintJobManager _printJobManager;
[@override](/user/override)
void initState() {
super.initState();
_printJobManager = PrintJobManager(_cs50sdkupdatePlugin);
}
Future<void> _getPlatformVersion() async {
String platformVersion;
try {
platformVersion = await _cs50sdkupdatePlugin.getPlatformVersion() ?? 'Unknown platform version';
_showSnackBar('Platform version: $platformVersion');
} on PlatformException {
_showSnackBar('Failed to get platform version.');
platformVersion = 'Failed to get platform version.';
}
setState(() {
_platformVersion = platformVersion;
});
}
Future<void> initializePicc() async {
try {
await _cs50sdkupdatePlugin.openPicc();
setState(() {
_piccStatus = 'PICC initialized';
});
_showSnackBar('PICC initialized successfully.');
} on PlatformException {
setState(() {
_piccStatus = 'Failed to initialize PICC';
});
_showSnackBar('Failed to initialize PICC.');
}
}
Future<void> closePicc() async {
try {
await _cs50sdkupdatePlugin.piccClose();
setState(() {
_piccStatus = 'PICC closed';
});
_showSnackBar('PICC closed.');
} on PlatformException {
_showSnackBar('Failed to close PICC.');
}
}
Future<void> removePicc() async {
try {
await _cs50sdkupdatePlugin.piccRemove();
setState(() {
_piccStatus = 'PICC removed';
});
_showSnackBar('PICC removed.');
} on PlatformException {
_showSnackBar('Failed to remove PICC.');
}
}
Future<void> piccCheck() async {
String piccCheckData;
try {
piccCheckData = await _cs50sdkupdatePlugin.piccCheck() ?? 'No data';
_showSnackBar('PICC Check: $piccCheckData');
} on PlatformException {
_showSnackBar('Failed to check PICC.');
piccCheckData = 'Failed to check PICC.';
}
setState(() {
_pollingData = piccCheckData;
});
}
Future<void> startPolling() async {
String pollingData;
try {
pollingData = await _cs50sdkupdatePlugin.piccPolling() ?? 'No data';
_showSnackBar('Polling data: $pollingData');
} on PlatformException {
_showSnackBar('Failed to poll data.');
pollingData = 'Failed to poll data.';
}
setState(() {
_pollingData = pollingData;
});
}
Future<void> executeCommands() async {
String? apiVersion = await _cs50sdkupdatePlugin.sysApiVerson();
String? deviceId = await _cs50sdkupdatePlugin.getDeviceId();
_showSnackBar('API version: $apiVersion\nDevice ID: $deviceId');
}
Future<void> executePiccSamAv2Init() async {
int samSlotNo = 1;
List<int> samHostKey = List.filled(16, 0);
try {
String? samInitResponse = await _cs50sdkupdatePlugin.piccSamAv2Init(samSlotNo, samHostKey);
_showSnackBar('SAM AV2 Init Response: $samInitResponse');
} catch (e) {
_showSnackBar('Failed to initialize SAM AV2: $e');
}
}
Future<void> executeNfc() async {
List<int> nfcDataLen = List.filled(5, 0);
List<int> technology = List.filled(25, 0);
List<int> nfcUid = List.filled(56, 0);
List<int> ndefMessage = List.filled(500, 0);
try {
String? nfcResponse = await _cs50sdkupdatePlugin.piccNfc(nfcDataLen, technology, nfcUid, ndefMessage);
_showSnackBar('NFC Response: $nfcResponse');
} catch (e) {
_showSnackBar('Failed to execute NFC: $e');
}
}
// 打印函数
Future<void> _initPrinter() async {
try {
await _cs50sdkupdatePlugin.printInit();
setState(() {
_printStatus = 'Printer initialized';
});
_showSnackBar('Printer initialized');
} catch (e) {
setState(() {
_printStatus = 'Failed to initialize printer: $e';
});
_showSnackBar('Failed to initialize printer: $e');
}
}
Future<void> _printText() async {
try {
await _cs50sdkupdatePlugin.printStr('Hello, World!\n');
await _cs50sdkupdatePlugin.printStr('This is a test print.\n');
await _printJobManager.printAllPages();
_showSnackBar('Text printed successfully');
} catch (e) {
_showSnackBar('Failed to print text: $e');
}
}
Future<void> _printBarcode() async {
try {
await _cs50sdkupdatePlugin.printBarcode('1234567890', 300, 100, 'CODE_128');
await _cs50sdkupdatePlugin.printStart();
_showSnackBar('Barcode printed successfully');
} catch (e) {
_showSnackBar('Failed to print barcode: $e');
}
}
Future<void> _printQRCode() async {
try {
await _cs50sdkupdatePlugin.printQrCode('https://example.com', 200, 200, 'QR_CODE');
await _cs50sdkupdatePlugin.printStart();
_showSnackBar('QR Code printed successfully');
} catch (e) {
_showSnackBar('Failed to print QR Code: $e');
}
}
Future<void> _initPrinterWithParams() async {
try {
await _cs50sdkupdatePlugin.printInitWithParams(50, 24, 24, 0);
_showSnackBar('Printer initialized with parameters');
} catch (e) {
_showSnackBar('Failed to initialize printer with parameters: $e');
}
}
Future<void> _printSetFont() async {
try {
await _cs50sdkupdatePlugin.printSetFont(24, 24, 0);
_showSnackBar('Font set successfully');
} catch (e) {
_showSnackBar('Failed to set font: $e');
}
}
Future<void> _printSetGray() async {
try {
await _cs50sdkupdatePlugin.printSetGray(50);
_showSnackBar('Gray level set successfully');
} catch (e) {
_showSnackBar('Failed to set gray level: $e');
}
}
Future<void> _printSetSpace() async {
try {
await _cs50sdkupdatePlugin.printSetSpace(0, 0);
_showSnackBar('Space set successfully');
} catch (e) {
_showSnackBar('Failed to set space: $e');
}
}
Future<void> _printGetFont() async {
try {
String? font = await _cs50sdkupdatePlugin.printGetFont();
_showSnackBar('Current font: $font');
} catch (e) {
_showSnackBar('Failed to get font: $e');
}
}
Future<void> _printStep() async {
try {
await _cs50sdkupdatePlugin.printStep(100);
_showSnackBar('Step printed successfully');
} catch (e) {
_showSnackBar('Failed to print step: $e');
}
}
Future<void> _printSetVoltage() async {
try {
await _cs50sdkupdatePlugin.printSetVoltage(7);
_showSnackBar('Voltage set successfully');
} catch (e) {
_showSnackBar('Failed to set voltage: $e');
}
}
Future<void> _printIsCharge() async {
try {
await _cs50sdkupdatePlugin.printIsCharge(1);
_showSnackBar('Charge status set successfully');
} catch (e) {
_showSnackBar('Failed to set charge status: $e');
}
}
Future<void> _printSetLinPixelDis() async {
try {
await _cs50sdkupdatePlugin.printSetLinPixelDis(384);
_showSnackBar('Line pixel distance set successfully');
} catch (e) {
_showSnackBar('Failed to set line pixel distance: $e');
}
}
Future<void> _printStr() async {
try {
await _cs50sdkupdatePlugin.printStr('Hello, World!\n');
_showSnackBar('Text printed successfully');
} catch (e) {
_showSnackBar('Failed to print text: $e');
}
}
Future<void> _printBmp() async {
// 注意:您需要提供实际的位图数据
try {
Uint8List bmpData = Uint8List(0); // 替换为实际的位图数据
await _cs50sdkupdatePlugin.printBmp(bmpData);
_showSnackBar('Bitmap printed successfully');
} catch (e) {
_showSnackBar('Failed to print bitmap: $e');
}
}
Future<void> _printCutQRCodeStr() async {
try {
await _cs50sdkupdatePlugin.printCutQrCodeStr('https://example.com', 'Scan me!', 10, 200, 200, 'QR_CODE');
_showSnackBar('QR Code with text printed successfully');
} catch (e) {
_showSnackBar('Failed to print QR Code with text: $e');
}
}
Future<void> _printStart() async {
try {
await _cs50sdkupdatePlugin.printStart();
_showSnackBar('Print started successfully');
} catch (e) {
_showSnackBar('Failed to start print: $e');
}
}
Future<void> _printSetLeftIndent() async {
try {
await _cs50sdkupdatePlugin.printSetLeftIndent(10);
_showSnackBar('Left indent set successfully');
} catch (e) {
_showSnackBar('Failed to set left indent: $e');
}
}
Future<void> _printSetAlign() async {
try {
await _cs50sdkupdatePlugin.printSetAlign(1); // 0: 左对齐, 1: 居中, 2: 右对齐
_showSnackBar('Alignment set successfully');
} catch (e) {
_showSnackBar('Failed to set alignment: $e');
}
}
Future<void> _printCharSpace() async {
try {
await _cs50sdkupdatePlugin.printCharSpace(1);
_showSnackBar('Character space set successfully');
} catch (e) {
_showSnackBar('Failed to set character space: $e');
}
}
Future<void> _printSetLineSpace() async {
try {
await _cs50sdkupdatePlugin.printSetLineSpace(50);
_showSnackBar('Line space set successfully');
} catch (e) {
_showSnackBar('Failed to set line space: $e');
}
}
Future<void> _printSetLeftSpace() async {
try {
await _cs50sdkupdatePlugin.printSetLeftSpace(10);
_showSnackBar('Left space set successfully');
} catch (e) {
_showSnackBar('Failed to set left space: $e');
}
}
Future<void> _printSetSpeed() async {
try {
await _cs50sdkupdatePlugin.printSetSpeed(5);
_showSnackBar('Print speed set successfully');
} catch (e) {
_showSnackBar('Failed to set print speed: $e');
}
}
Future<void> _printCheckStatus() async {
try {
String? status = await _cs50sdkupdatePlugin.printCheckStatus();
_showSnackBar('Printer status: $status');
} catch (e) {
_showSnackBar('Failed to check printer status: $e');
}
}
Future<void> _printFeedPaper() async {
try {
await _cs50sdkupdatePlugin.printFeedPaper(100);
_showSnackBar('Paper fed successfully');
} catch (e) {
_showSnackBar('Failed to feed paper: $e');
}
}
Future<void> _printSetMode() async {
try {
await _cs50sdkupdatePlugin.printSetMode(0); // 0: 正常, 1: 白底黑字
_showSnackBar('Print mode set successfully');
} catch (e) {
_showSnackBar('Failed to set print mode: $e');
}
}
Future<void> _printSetUnderline() async {
try {
await _cs50sdkupdatePlugin.printSetUnderline(1); // 0: 关闭, 1: 开启
_showSnackBar('Underline set successfully');
} catch (e) {
_showSnackBar('Failed to set underline: $e');
}
}
Future<void> _printSetReverse() async {
try {
await _cs50sdkupdatePlugin.printSetReverse(1); // 0: 关闭, 1: 开启
_showSnackBar('Reverse print set successfully');
} catch (e) {
_showSnackBar('Failed to set reverse print: $e');
}
}
Future<void> _printSetBold() async {
try {
await _cs50sdkupdatePlugin.printSetBold(1); // 0: 关闭, 1: 开启
_showSnackBar('Bold print set successfully');
} catch (e) {
_showSnackBar('Failed to set bold print: $e');
}
}
Future<void> _printLogo() async {
// 注意:您需要提供实际的徽标数据
try {
Uint8List logoData = Uint8List.fromList([
0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, // 第一行
0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, // 第二行
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, // 第三行
0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, // 第四行
0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, // 第五行
0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, // 第六行
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, // 第七行
0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, // 第八行
0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, // 第九行
]);
await _cs50sdkupdatePlugin.printLogo(logoData);
_showSnackBar('Logo printed successfully');
} catch (e) {
_showSnackBar('Failed to print logo: $e');
}
}
Future<void> _printLabLocate() async {
try {
await _cs50sdkupdatePlugin.printLabLocate(100);
_showSnackBar('Label located successfully');
} catch (e) {
_showSnackBar('Failed to locate label: $e');
}
}
void _showSnackBar(String message) {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text(message),
duration: const Duration(seconds: 3),
));
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('CS50 SDK Update Demo'),
elevation: 0,
),
body: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
colors: [Colors.blue.shade100, Colors.blue.shade300],
),
),
child: SingleChildScrollView(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Card(
elevation: 5,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15)),
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
Text('Platform: $_platformVersion', style: const TextStyle(fontSize: 16)),
const SizedBox(height: 8),
Text('PICC Status: $_piccStatus', style: const TextStyle(fontSize: 16)),
const SizedBox(height: 8),
Text('Polling: $_pollingData', style: const TextStyle(fontSize: 16)),
const SizedBox(height: 8),
Text('Printer: $_printStatus', style: const TextStyle(fontSize: 16)),
],
),
),
),
const SizedBox(height: 16),
_buildSection('初始化', [
_buildButton(Icons.power_settings_new, '获取平台版本', _getPlatformVersion),
_buildButton(Icons.nfc, '初始化PICC', initializePicc),
]),
const SizedBox(height: 16),
_buildSection('PICC操作', [
_buildButton(Icons.close, '关闭PICC', closePicc),
_buildButton(Icons.remove_circle, '移除PICC', removePicc),
_buildButton(Icons.check_circle, 'PICC检查', piccCheck),
_buildButton(Icons.loop, '开始轮询', startPolling),
]),
const SizedBox(height: 16),
_buildSection('其他操作', [
_buildButton(Icons.code, '执行命令', executeCommands),
_buildButton(Icons.memory, 'SAM AV2初始化', executePiccSamAv2Init),
_buildButton(Icons.nfc, '执行NFC', executeNfc),
]),
const SizedBox(height: 16),
_buildSection('打印机初始化', [
_buildButton(Icons.print, '初始化打印机', _initPrinter),
_buildButton(Icons.settings, '使用参数初始化', _initPrinterWithParams),
]),
const SizedBox(height: 16),
_buildSection('打印机设置', [
_buildButton(Icons.font_download, '设置字体', _printSetFont),
_buildButton(Icons.format_color_fill, '设置灰度', _printSetGray),
_buildButton(Icons.space_bar, '设置间距', _printSetSpace),
_buildButton(Icons.font_download_outlined, '获取字体', _printGetFont),
_buildButton(Icons.height, '设置步长', _printStep),
_buildButton(Icons.battery_charging_full, '设置电压', _printSetVoltage),
_buildButton(Icons.power, '设置充电状态', _printIsCharge),
_buildButton(Icons.linear_scale, '设置行像素', _printSetLinPixelDis),
_buildButton(Icons.format_align_left, '设置左缩进', _printSetLeftIndent),
_buildButton(Icons.format_align_center, '设置对齐方式', _printSetAlign),
_buildButton(Icons.space_bar_outlined, '设置字符间距', _printCharSpace),
_buildButton(Icons.format_line_spacing, '设置行间距', _printSetLineSpace),
_buildButton(Icons.format_indent_increase, '设置左边距', _printSetLeftSpace),
_buildButton(Icons.speed, '设置打印速度', _printSetSpeed),
_buildButton(Icons.mode, '设置打印模式', _printSetMode),
_buildButton(Icons.format_underlined, '设置下划线', _printSetUnderline),
_buildButton(Icons.flip, '设置反向打印', _printSetReverse),
_buildButton(Icons.format_bold, '设置粗体打印', _printSetBold),
_buildButton(Icons.edit_note_outlined, '文档编辑器', _openEditor)
]),
const SizedBox(height: 16),
_buildSection('打印操作', [
_buildButton(Icons.text_fields, '打印文本', _printStr),
_buildButton(Icons.image, '打印位图', _printBmp),
_buildButton(Icons.qr_code, '打印条形码', _printBarcode),
_buildButton(Icons.qr_code_2, '打印二维码', _printQRCode),
_buildButton(Icons.qr_code_scanner, '打印带文本的二维码', _printCutQRCodeStr),
_buildButton(Icons.play_arrow, '开始打印', _printStart),
_buildButton(Icons.logo_dev, '打印徽标', _printLogo),
_buildButton(Icons.text_snippet_rounded, '打印所有文本', _printText),
_buildButton(Icons.picture_as_pdf, '打印PDF', _printPdf),
_buildButton(Icons.picture_as_pdf, '打印现有PDF', _printExistingPdf),
_buildButton(Icons.add_to_photos, '创建并打印简单的PDF', _createAndPrintSimplePdf),
]),
const SizedBox(height: 16),
_buildSection('打印机实用工具', [
_buildButton(Icons.check_circle_outline, '检查状态', _printCheckStatus),
_buildButton(Icons.vertical_align_bottom, '进纸', _printFeedPaper),
_buildButton(Icons.label_outline, '定位标签', _printLabLocate),
_buildButton(Icons.list, '打印状态', _openPrintStatusScreen),
]),
],
),
),
),
);
}
Widget _buildSection(String title, List<Widget> children) {
return Card(
elevation: 3,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15)),
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(title, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
const SizedBox(height: 12),
Wrap(
spacing: 8,
runSpacing: 8,
children: children,
),
],
),
),
);
}
Widget _buildButton(IconData icon, String label, VoidCallback onPressed) {
return ElevatedButton.icon(
icon: Icon(icon),
label: Text(label),
onPressed: onPressed,
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30)),
),
);
}
void _openEditor() {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => CustomDocumentEditor(
printPlugin: _cs50sdkupdatePlugin,
jobManager: _printJobManager,
),
),
);
}
void _openPrintStatusScreen() {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ModernPrintStatusScreen(jobManager: _printJobManager),
),
);
}
Future<void> _printExistingPdf() async {
try {
// 对于此示例,我们将使用资源文件夹中的PDF文件
// 确保在您的assets中添加一个PDF文件,并相应地更新pubspec.yaml
final byteData = await rootBundle.load('assets/KAT_03_07_2024_18-Batches.pdf');
final tempDir = await getTemporaryDirectory();
final tempFile = File('${tempDir.path}/temp.pdf');
await tempFile.writeAsBytes(byteData.buffer.asUint8List());
await _printJobManager.printPdf(tempFile.path);
_showSnackBar('PDF打印开始');
// 打开打印状态屏幕
_openPrintStatusScreen();
} catch (e) {
_showSnackBar('打印PDF失败: $e');
}
}
Future<void> _createAndPrintSimplePdf() async {
try {
_showSnackBar('简单PDF创建并开始打印');
// _pdfPrinter.createAndPrintSimplePdf();
_printJobManager.printImagePdf();
// 打开打印状态屏幕
_openPrintStatusScreen();
} catch (e) {
_showSnackBar('创建并打印简单PDF失败: $e');
}
}
Future<void> _printPdf() async {
try {
// 对于此示例,我们将使用资源文件夹中的PDF文件
// 确保在您的assets中添加一个PDF文件,并相应地更新pubspec.yaml
final byteData = await rootBundle.load('assets/KAT_03_07_2024_18-Batches.pdf');
final tempDir = await getTemporaryDirectory();
final tempFile = File('${tempDir.path}/temp.pdf');
await tempFile.writeAsBytes(byteData.buffer.asUint8List());
await _printJobManager.printPdf(tempFile.path);
//
// await _pdfPrinter.printPdf(tempFile.path);
// await _pdfPrinter.printImagePdf();
_showSnackBar('PDF打印开始');
// 打开打印状态屏幕
_openPrintStatusScreen();
} catch (e) {
_showSnackBar('打印PDF失败: $e');
}
}
}
更多关于Flutter SDK更新管理插件cs50sdkupdate的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter SDK更新管理插件cs50sdkupdate的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
在Flutter中管理SDK更新是一个重要的任务,特别是当你需要确保应用使用的库和插件始终是最新的。cs50sdkupdate
这个插件(假设它存在,因为实际上Flutter生态系统中并没有一个广泛认知的名为cs50sdkupdate
的插件)可能是一个用于管理SDK更新的自定义插件。不过,我们可以讨论一个类似的通用方案,使用Flutter和Dart代码来实现SDK更新管理功能。
由于cs50sdkupdate
不是标准Flutter插件,我将提供一个使用Flutter和Dart的示例代码,展示如何检查依赖项的版本并提示用户更新。这个示例不会直接涉及到cs50sdkupdate
插件,但会展示一个管理依赖项更新的通用方法。
步骤 1: 添加依赖项检查逻辑
首先,我们需要在pubspec.yaml
文件中列出所有依赖项。然后,我们可以编写一个Dart脚本来检查这些依赖项是否有新版本可用。
pubspec.yaml
示例
name: my_flutter_app
description: A new Flutter application.
version: 1.0.0+1
environment:
sdk: ">=2.12.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
http: ^0.13.3 # 示例依赖项
provider: ^6.0.0 # 另一个示例依赖项
dev_dependencies:
flutter_test:
sdk: flutter
检查依赖项更新的 Dart 脚本
虽然Flutter本身没有直接提供检查pub包更新的API,但你可以使用命令行工具结合Dart的Process
类来实现这一功能。以下是一个简单的示例,展示如何检查http
和provider
包是否有新版本。
import 'dart:io';
void main() async {
List<String> packagesToCheck = ['http', 'provider'];
for (var package in packagesToCheck) {
ProcessResult result = await Process.run('flutter', ['pub', 'outdated', '--mode=null-safety', '--json']);
Map<String, dynamic> jsonResult = jsonDecode(result.stdout);
if (jsonResult['packages']![package] != null) {
Map<String, dynamic> packageInfo = jsonResult['packages']![package]!;
String currentVersion = packageInfo['current']!['version']!;
String latestVersion = packageInfo['latest']!['version']!;
if (currentVersion != latestVersion) {
print('Package $package has a new version available: $latestVersion (current: $currentVersion)');
} else {
print('Package $package is up to date: $currentVersion');
}
}
}
}
步骤 2: 集成到Flutter应用中
你可以将上述脚本集成到你的Flutter应用中,通过按钮点击或其他触发机制来运行这个脚本,并显示更新信息给用户。
在Flutter中运行脚本的示例
由于直接在Flutter应用中运行Dart脚本有些复杂,通常的做法是通过平台通道调用原生代码(如Android的Java/Kotlin或iOS的Swift/Objective-C),然后在这些原生代码中执行shell命令。但这里为了简化,我们可以考虑使用package:process_run
之类的包来封装这个过程(注意,直接在Flutter UI线程中执行长时间运行的进程可能不是最佳实践,应该使用隔离区或后台任务)。
注意事项
- 上述脚本是一个简化的例子,实际使用中你可能需要处理更多的边缘情况和错误。
- 在生产环境中,检查依赖项更新通常不会由客户端应用直接完成,而是由构建系统或持续集成/持续部署(CI/CD)管道来处理。
- 确保你的应用有适当的权限(特别是在iOS上)来执行shell命令。
虽然这个例子没有直接使用cs50sdkupdate
插件,但它提供了一个基于Flutter和Dart的通用方法来管理依赖项的更新。如果你确实有一个名为cs50sdkupdate
的特定插件,并且需要具体的使用指导,请提供更多关于该插件的信息或文档链接。