windows_printer 0.2.1 
windows_printer: ^0.2.1 copied to clipboard
manasbasnet.comA Flutter plugin for managing and interacting with printers on Windows platforms.
import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:windows_printer/windows_printer.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Windows Printer Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const PrinterDemoPage(),
);
}
}
class PrinterDemoPage extends StatefulWidget {
const PrinterDemoPage({super.key});
@override
State<PrinterDemoPage> createState() => _PrinterDemoPageState();
}
class _PrinterDemoPageState extends State<PrinterDemoPage> {
List<String> _printers = [];
String? _selectedPrinter;
Map<String, dynamic>? _printerProperties;
Map<String, dynamic>? _paperSizeDetails;
bool _loading = true;
String _status = '';
// Demo settings
bool _isThermalPrinter = false;
int _pdfCopies = 1;
String _selectedFont = 'Courier New';
int _fontSize = 12;
@override
void initState() {
super.initState();
_loadPrinters();
}
Future<void> _loadPrinters() async {
setState(() {
_loading = true;
_status = 'Loading printers...';
});
try {
final printers = await WindowsPrinter.getAvailablePrinters();
setState(() {
_printers = printers;
_loading = false;
_status = 'Found ${printers.length} printers';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
Future<void> _selectPrinter(String? printer) async {
if (printer == null) return;
setState(() {
_selectedPrinter = printer;
_printerProperties = null;
_paperSizeDetails = null;
_loading = true;
_status = 'Loading printer details...';
});
try {
final properties = WindowsPrinter.getPrinterProperties(printer);
final paperDetails = WindowsPrinter.getPaperSizeDetails(printer);
final results = await Future.wait([properties, paperDetails]);
setState(() {
_printerProperties = results[0];
_paperSizeDetails = results[1];
_loading = false;
_status = 'Printer details loaded';
// Try to check if te printer is thermal printer
_isThermalPrinter = _detectThermalPrinter(printer);
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
bool _detectThermalPrinter(String printerName) {
final thermal = printerName.toLowerCase();
return thermal.contains('thermal') ||
thermal.contains('receipt') ||
thermal.contains('pos') ||
thermal.contains('tm-') ||
thermal.contains('rp-');
}
Future<void> _setDefaultPrinter() async {
if (_selectedPrinter == null) return;
setState(() {
_loading = true;
_status = 'Setting default printer...';
});
try {
final success = await WindowsPrinter.setDefaultPrinter(_selectedPrinter!);
await _loadPrinters();
setState(() {
_loading = false;
_status = success ? 'Default printer set successfully' : 'Failed to set default printer';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
Future<void> _openPrinterProperties() async {
if (_selectedPrinter == null) return;
setState(() {
_status = 'Opening printer properties...';
});
try {
await WindowsPrinter.openPrinterProperties(_selectedPrinter!);
setState(() {
_status = 'Printer properties dialog opened';
});
} catch (e) {
setState(() {
_status = 'Error: $e';
});
}
}
// THERMAL PRINTER METHODS (using ESC/POS)
Future<void> _printThermalReceipt() async {
if (_selectedPrinter == null) return;
setState(() {
_loading = true;
_status = 'Printing thermal receipt...';
});
try {
final escPosData = await _generateThermalReceipt();
final success = await WindowsPrinter.printRawData(
printerName: _selectedPrinter!,
data: Uint8List.fromList(escPosData),
useRawDatatype: true, // ESSENTIAL for thermal printers
);
setState(() {
_loading = false;
_status = success ? 'Thermal receipt printed successfully' : 'Failed to print thermal receipt';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
Future<List<int>> _generateThermalReceipt() async {
final receipt = WPReceiptBuilder(wpPaperSize: WPPaperSize.mm58)
.header('RECEIPT')
.line('Coffee & More Shop', style: const WPTextStyle(
align: WPTextAlign.center,
bold: true,
size: WPTextSize.doubleHeight
))
.line('123 Main Street, City', style: const WPTextStyle(
align: WPTextAlign.center,
italic: true
))
.line('Tel: (555) 123-4567', style: const WPTextStyle(
align: WPTextAlign.center,
underline: true
))
.separator()
.line('Receipt #: R001234', style: const WPTextStyle(align: WPTextAlign.left))
.line('Date: ${DateTime.now().toString().substring(0, 16)}', style: const WPTextStyle(align: WPTextAlign.left))
.line('Cashier: John D.', style: const WPTextStyle(align: WPTextAlign.right))
.separator()
.line('ITEMS', style: const WPTextStyle(
bold: true,
align: WPTextAlign.center,
size: WPTextSize.doubleWidth,
underline: true
))
.blank()
.item('Espresso', '\$2.50')
.line(' * Premium blend', style: const WPTextStyle(italic: true))
.item('Cappuccino', '\$3.75')
.line(' * Large size', style: const WPTextStyle(italic: true, align: WPTextAlign.right))
.line('Croissant', style: const WPTextStyle(bold: true))
.line(' Fresh baked \$2.25', style: const WPTextStyle(italic: true))
.line('Muffin (Blueberry)', style: const WPTextStyle(underline: true))
.line(' Special of the day \$3.00')
.item('Orange Juice', '\$2.75')
.blank()
.separator()
.line('Subtotal: \$14.25', style: const WPTextStyle(align: WPTextAlign.left))
.line('Tax (8.5%): \$1.21', style: const WPTextStyle(align: WPTextAlign.left))
.line('Discount: -\$0.50', style: const WPTextStyle(
align: WPTextAlign.left,
italic: true
))
.separator()
.line('TOTAL: \$14.96', style: const WPTextStyle(
bold: true,
size: WPTextSize.doubleHeightWidth,
align: WPTextAlign.center,
underline: true
))
.separator()
.line('PAYMENT', style: const WPTextStyle(
bold: true,
align: WPTextAlign.center,
size: WPTextSize.doubleHeight
))
.line('Card Payment: \$14.96', style: const WPTextStyle(bold: true))
.line('Card Type:', style: const WPTextStyle(italic: true))
.line(' VISA ****1234', style: const WPTextStyle(align: WPTextAlign.center))
.line('Auth Code: A12345', style: const WPTextStyle(
align: WPTextAlign.center,
underline: true
))
.separator()
.line('Customer: Sarah M.', style: const WPTextStyle(align: WPTextAlign.left))
.line('Points Earned: 15', style: const WPTextStyle(
align: WPTextAlign.center,
italic: true
))
.line('Total Points: 245', style: const WPTextStyle(
align: WPTextAlign.right,
bold: true
))
.separator()
.line('SPECIAL OFFERS', style: const WPTextStyle(
align: WPTextAlign.center,
bold: true,
size: WPTextSize.doubleWidth,
invert: true
))
.line('Buy 5 coffees, get 1 FREE!', style: const WPTextStyle(
align: WPTextAlign.center,
italic: true,
underline: true
))
.line('Valid until: Dec 31, 2025', style: const WPTextStyle(
align: WPTextAlign.center,
size: WPTextSize.normal
))
.separator()
.line('Scan for digital receipt:', style: const WPTextStyle(
align: WPTextAlign.center,
italic: true
))
.addQRCode('https://manasbasnet.com')
.blank()
.line('Thank you for your visit!', style: const WPTextStyle(
align: WPTextAlign.center,
bold: true,
size: WPTextSize.doubleHeight
))
.line('Please come again soon', style: const WPTextStyle(
align: WPTextAlign.center,
italic: true
))
.line('Follow us @coffeeshop', style: const WPTextStyle(
align: WPTextAlign.center,
underline: true
))
.separator()
.line('RETURN POLICY:', style: const WPTextStyle(
bold: true,
underline: true,
size: WPTextSize.doubleWidth
))
.line('Returns accepted within 7 days', style: const WPTextStyle(italic: true))
.line('with receipt and original', style: const WPTextStyle(italic: true))
.line('packaging.', style: const WPTextStyle(italic: true))
.blank()
.line('FORMATTING DEMO COMPLETE', style: const WPTextStyle(
bold: true,
align: WPTextAlign.center,
size: WPTextSize.doubleHeightWidth,
invert: true
))
.blank()
// Hardware actions
// .drawer() // Open cash drawer
.beep(count: 1,duration: 1) // Confirmation beep
// .cut(partial: true) // Uncomment to auto-cut paper
.build();
return receipt;
}
// REGULAR PRINTER METHODS (using GDI)
Future<void> _printRichTextDocument() async {
if (_selectedPrinter == null) return;
setState(() {
_loading = true;
_status = 'Printing rich text document...';
});
try {
final content = _createRichTextContent();
final success = await WindowsPrinter.printRichTextDocument(
printerName: _selectedPrinter!,
content: content,
fontName: _selectedFont,
fontSize: _fontSize,
);
setState(() {
_loading = false;
_status = success ? 'Rich text document printed successfully' : 'Failed to print rich text';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
String _createRichTextContent() {
return '''##REGULAR PRINTER DEMO##
Rich Text Document with GDI Rendering
Font: $_selectedFont, Size: $_fontSize pt
=====================================
**FORMATTING EXAMPLES:**
- **Bold text example**
- *Italic text example*
- ##Large header text##
- ***Bold and italic combined***
- Regular normal text
**RECEIPT SIMULATION:**
Date: ${DateTime.now().toString().substring(0, 19)}
-------------------------------------
Coffee \$3.50
*Special* Sandwich \$7.25
Donut \$2.00
-------------------------------------
**Total: \$12.75**
*Thank you for your business!*
**Please visit again soon**
This document demonstrates rich text formatting
using markup symbols for regular printers.''';
}
// PDF PRINTING (works with both printer types)
Future<void> _printPdfSample() async {
if (_selectedPrinter == null) return;
setState(() {
_loading = true;
_status = 'Printing PDF sample...';
});
try {
// Note: In real app, you'd load actual PDF data
// This is just a demonstration of the method signature
final pdfData = _generateSamplePdfData();
final success = await WindowsPrinter.printPdf(
printerName: _selectedPrinter!,
data: pdfData,
copies: _pdfCopies,
);
setState(() {
_loading = false;
_status = success ? 'PDF printed successfully ($_pdfCopies copies)' : 'Failed to print PDF';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
Uint8List _generateSamplePdfData() {
// In a real application, you would load actual PDF file data
// For demo purposes, we'll use placeholder data
final sampleText = 'Sample PDF content for demonstration';
return Uint8List.fromList(utf8.encode(sampleText));
}
// TEXT MODE DEMONSTRATION (for comparison)
Future<void> _printTextModeComparison() async {
if (_selectedPrinter == null) return;
setState(() {
_loading = true;
_status = 'Printing text mode comparison...';
});
try {
final textContent = 'TEXT MODE COMPARISON\n'
'Date: ${DateTime.now()}\n'
'Printer: $_selectedPrinter\n'
'-------------------------\n'
'This uses TEXT datatype\n'
'Notice the difference in quality\n'
'compared to other methods.\n'
'-------------------------\n\n\n';
final success = await WindowsPrinter.printRawData(
printerName: _selectedPrinter!,
data: Uint8List.fromList(utf8.encode(textContent)),
useRawDatatype: false, // Use TEXT mode for comparison
);
setState(() {
_loading = false;
_status = success ? 'Text mode sample printed' : 'Failed to print text mode sample';
});
} catch (e) {
setState(() {
_loading = false;
_status = 'Error: $e';
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Windows Printer Complete Demo'),
actions: [
IconButton(
icon: const Icon(Icons.refresh),
onPressed: _loadPrinters,
),
],
),
body: _loading
? const Center(child: CircularProgressIndicator())
: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// Status Section
Container(
width: double.infinity,
padding: const EdgeInsets.all(16.0),
color: Colors.grey[100],
child: Text(
'Status: $_status',
style: Theme.of(context).textTheme.bodyLarge,
),
),
// Printer Selection Section
Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Printer Selection', style: Theme.of(context).textTheme.titleLarge),
const SizedBox(height: 8),
Row(
children: [
Expanded(
child: DropdownButton<String>(
isExpanded: true,
hint: const Text('Select a printer'),
value: _selectedPrinter,
items: _printers.map((printer) {
return DropdownMenuItem<String>(
value: printer,
child: Text(printer),
);
}).toList(),
onChanged: _selectPrinter,
),
),
const SizedBox(width: 16),
ElevatedButton(
onPressed: _selectedPrinter == null ? null : _setDefaultPrinter,
child: const Text('Set Default'),
),
const SizedBox(width: 8),
ElevatedButton(
onPressed: _selectedPrinter == null ? null : _openPrinterProperties,
child: const Text('Properties'),
),
],
),
if (_selectedPrinter != null) ...[
const SizedBox(height: 16),
Row(
children: [
Checkbox(
value: _isThermalPrinter,
onChanged: (value) => setState(() => _isThermalPrinter = value ?? false),
),
const Text('This is a thermal/receipt printer'),
],
),
],
],
),
),
const Divider(),
// Print Methods Section
if (_selectedPrinter != null) ...[
Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Print Methods Demo', style: Theme.of(context).textTheme.titleLarge),
const SizedBox(height: 16),
// Thermal Printer Section
if (_isThermalPrinter) ...[
Container(
width: double.infinity,
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.green[50],
border: Border.all(color: Colors.green),
borderRadius: BorderRadius.circular(8),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('🖨️ THERMAL PRINTER METHODS',
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.green[800])),
const SizedBox(height: 8),
const Text('Use esc_pos_utils for programmatic control of thermal printers'),
const SizedBox(height: 12),
Wrap(
spacing: 8,
runSpacing: 8,
children: [
ElevatedButton.icon(
icon: const Icon(Icons.receipt),
label: const Text('Print ESC/POS Receipt'),
onPressed: _printThermalReceipt,
style: ElevatedButton.styleFrom(backgroundColor: Colors.green),
),
],
),
],
),
),
const SizedBox(height: 16),
],
// Regular Printer Section
if (!_isThermalPrinter) ...[
Container(
width: double.infinity,
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.blue[50],
border: Border.all(color: Colors.blue),
borderRadius: BorderRadius.circular(8),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('🖨️ REGULAR PRINTER METHODS',
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.blue[800])),
const SizedBox(height: 8),
const Text('High-quality formatted output for office printers'),
const SizedBox(height: 12),
// Font Settings
Row(
children: [
Expanded(
child: DropdownButton<String>(
value: _selectedFont,
items: ['Courier New', 'Arial', 'Times New Roman', 'Verdana']
.map((font) => DropdownMenuItem(value: font, child: Text(font)))
.toList(),
onChanged: (font) => setState(() => _selectedFont = font!),
),
),
const SizedBox(width: 16),
Text('Size: $_fontSize'),
Slider(
value: _fontSize.toDouble(),
min: 8,
max: 24,
divisions: 16,
onChanged: (value) => setState(() => _fontSize = value.round()),
),
],
),
const SizedBox(height: 8),
ElevatedButton.icon(
icon: const Icon(Icons.text_fields),
label: const Text('Print Rich Text (GDI)'),
onPressed: _printRichTextDocument,
style: ElevatedButton.styleFrom(backgroundColor: Colors.blue),
),
],
),
),
const SizedBox(height: 16),
],
// Universal Methods Section
Container(
width: double.infinity,
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.orange[50],
border: Border.all(color: Colors.orange),
borderRadius: BorderRadius.circular(8),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('🖨️ UNIVERSAL METHODS',
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.orange[800])),
const SizedBox(height: 8),
const Text('Works with both thermal and regular printers'),
const SizedBox(height: 12),
Wrap(
spacing: 8,
runSpacing: 8,
children: [
ElevatedButton.icon(
icon: const Icon(Icons.picture_as_pdf),
label: Text('Print PDF ($_pdfCopies copies)'),
onPressed: _printPdfSample,
style: ElevatedButton.styleFrom(backgroundColor: Colors.orange),
),
ElevatedButton.icon(
icon: const Icon(Icons.text_snippet),
label: const Text('Print Text Mode'),
onPressed: _printTextModeComparison,
style: ElevatedButton.styleFrom(backgroundColor: Colors.grey),
),
],
),
const SizedBox(height: 8),
Row(
children: [
const Text('PDF Copies: '),
Slider(
value: _pdfCopies.toDouble(),
min: 1,
max: 5,
divisions: 4,
label: _pdfCopies.toString(),
onChanged: (value) => setState(() => _pdfCopies = value.round()),
),
],
),
],
),
),
],
),
),
const Divider(),
// Method Usage Guide
Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('📚 Usage Guide', style: Theme.of(context).textTheme.titleLarge),
const SizedBox(height: 8),
Card(
child: Padding(
padding: const EdgeInsets.all(12.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text('✅ FOR THERMAL PRINTERS:', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.green)),
const Text('• Use printRawData(useRawDatatype: true) with ESC/POS commands'),
const Text('• Use esc_pos_utils package for programmatic control'),
const Text('• Supports: bold, alignment, cutting, cash drawer, beeping'),
const SizedBox(height: 8),
const Text('✅ FOR REGULAR PRINTERS:', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.blue)),
const Text('• Use printRichTextDocument() for formatted text'),
const Text('• Use printPdf() for PDF documents'),
const Text('• Supports: fonts, sizes, bold, italic, large text'),
const SizedBox(height: 8),
const Text('❌ AVOID:', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.red)),
const Text('• printRawData() on regular printers (poor quality)'),
const Text('• printRichTextDocument() on thermal printers (unreliable)'),
],
),
),
),
],
),
),
// Printer Details Section
if (_printerProperties != null) ...[
const Divider(),
Padding(
padding: const EdgeInsets.all(16.0),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// Printer Properties
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Printer Properties', style: Theme.of(context).textTheme.titleMedium),
const SizedBox(height: 8),
SizedBox(
height: 200,
child: ListView(
children: _printerProperties!.entries.map((entry) {
return Card(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(entry.key, style: const TextStyle(fontWeight: FontWeight.bold)),
Text(entry.value.toString()),
],
),
),
);
}).toList(),
),
),
],
),
),
const SizedBox(width: 16),
// Paper Sizes
if (_paperSizeDetails != null)
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Paper Sizes', style: Theme.of(context).textTheme.titleMedium),
const SizedBox(height: 8),
Text('Current: ${_paperSizeDetails!["currentPaperName"] ?? "Unknown"}',
style: const TextStyle(fontWeight: FontWeight.bold)),
const SizedBox(height: 8),
SizedBox(
height: 200,
child: ListView.builder(
itemCount: (_paperSizeDetails!["availablePaperSizes"] as List?)?.length ?? 0,
itemBuilder: (context, index) {
final paperSize = (_paperSizeDetails!["availablePaperSizes"] as List)[index];
final bool isSelected = paperSize["isSelected"] == true;
return Card(
color: isSelected ? Colors.blue.shade100 : null,
child: ListTile(
dense: true,
title: Text(paperSize["name"]),
subtitle: Text('${paperSize["width"]}x${paperSize["height"]}'),
),
);
},
),
),
],
),
),
],
),
),
],
],
],
),
),
);
}
}Metadata
4
likes
150
points
85
downloads
Publisher
Weekly Downloads
Metadata
A Flutter plugin for managing and interacting with printers on Windows platforms.
Documentation
License
MIT (license)
Dependencies
flutter, plugin_platform_interface
