Implement professional PDF-based label printing for boxes and locations
- Replace ZPL/image-based printing with ReportLab PDF generation - Box labels: 8cm x 5cm landscape with 'BOX Nr:' header and CODE128 barcode - Location labels: 8cm x 5cm landscape with 'Location nr:' header and CODE128 barcode - Add /generate_box_label_pdf endpoint using same approach as print_module - Update FG scan quick box creation to use PDF printing with default printer - Switch from CDN QZ Tray to local patched version for pairing-key auth - Improve error handling and logging throughout printing workflow - Fix import issues (add mm unit to warehouse.py) - Optimize barcode size and spacing for better readability
This commit is contained in:
Quality App System
@@ -3710,6 +3710,133 @@ def generate_labels_pdf(order_id, paper_saving_mode='true'):
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return jsonify({'error': str(e)}), 500
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@bp.route('/generate_box_label_pdf', methods=['POST'])
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def generate_box_label_pdf():
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"""Generate a PDF box label with barcode for printing via QZ Tray"""
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if 'role' not in session:
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return jsonify({'error': 'Access denied. Please log in.'}), 403
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try:
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from io import BytesIO
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from reportlab.lib.pagesizes import letter
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from reportlab.pdfgen import canvas
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from reportlab.lib import colors
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from reportlab.lib.units import mm
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from reportlab.graphics.barcode import code128
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from flask import make_response
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# Get box number from request
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box_number = request.form.get('box_number', 'Unknown')
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print(f"DEBUG: Generating box label PDF for box: {box_number}")
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# Create PDF buffer
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pdf_buffer = BytesIO()
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# Create canvas with 8cm x 5cm size in landscape orientation
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page_width = 80 * mm # 8 cm
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page_height = 50 * mm # 5 cm
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c = canvas.Canvas(pdf_buffer, pagesize=(page_width, page_height))
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# Optimize for label printer
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c.setPageCompression(1)
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c.setCreator("Trasabilitate Box Label System")
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c.setTitle("Box Label - Optimized for Label Printers")
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# Define margins and usable area
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margin = 2 * mm
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usable_width = page_width - (2 * margin)
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usable_height = page_height - (2 * margin)
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# Calculate vertical layout
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# Top section: "BOX Nr: XXXXXXXX" text
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# Bottom section: Barcode
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text_height = 12 * mm # Space for text at top (reduced from 15mm)
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barcode_height = usable_height - text_height - (1 * mm) # Rest for barcode with minimal spacing (reduced from 3mm)
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# === TOP SECTION: BOX Nr Label ===
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# Position from top of usable area
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text_y = page_height - margin - text_height
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# Draw "BOX Nr:" label
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c.setFont("Helvetica-Bold", 14)
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label_text = "BOX Nr:"
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label_width = c.stringWidth(label_text, "Helvetica-Bold", 14)
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# Draw box number
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c.setFont("Helvetica-Bold", 18)
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number_text = box_number
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number_width = c.stringWidth(number_text, "Helvetica-Bold", 18)
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# Calculate total width and center everything
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total_text_width = label_width + 3*mm + number_width # 3mm spacing between label and number
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start_x = margin + (usable_width - total_text_width) / 2
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# Draw label text
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c.setFont("Helvetica-Bold", 14)
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c.drawString(start_x, text_y + 5*mm, label_text)
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# Draw box number
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c.setFont("Helvetica-Bold", 18)
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c.drawString(start_x + label_width + 3*mm, text_y + 5*mm, number_text)
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# === BOTTOM SECTION: Barcode ===
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barcode_y = margin
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try:
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# Create barcode for box number
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barcode = code128.Code128(
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box_number,
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barWidth=0.4*mm, # Thicker bars for better scanning
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barHeight=barcode_height,
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humanReadable=True,
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fontSize=10
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)
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# Calculate scaling to fit width
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scale_factor = usable_width / barcode.width
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# Center the barcode horizontally
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barcode_x = margin + (usable_width - (barcode.width * scale_factor)) / 2
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# Draw the barcode
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c.saveState()
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c.translate(barcode_x, barcode_y)
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c.scale(scale_factor, 1)
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barcode.drawOn(c, 0, 0)
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c.restoreState()
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print(f"DEBUG: Barcode generated successfully with scale factor: {scale_factor}")
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except Exception as e:
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print(f"DEBUG: Error generating barcode: {e}")
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# Fallback: draw text if barcode fails
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c.setFont("Helvetica-Bold", 12)
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text_width = c.stringWidth(box_number, "Helvetica-Bold", 12)
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c.drawString((page_width - text_width) / 2, barcode_y + barcode_height/2, box_number)
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c.save()
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# Get PDF data
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pdf_buffer.seek(0)
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pdf_data = pdf_buffer.getvalue()
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# Create response
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response = make_response(pdf_data)
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response.headers['Content-Type'] = 'application/pdf'
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response.headers['Content-Disposition'] = f'inline; filename="box_label_{box_number}.pdf"'
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print(f"DEBUG: Box label PDF generated successfully")
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return response
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except Exception as e:
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print(f"DEBUG: Error generating box label PDF: {e}")
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import traceback
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traceback.print_exc()
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return jsonify({'error': str(e)}), 500
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@bp.route('/generate_label_pdf', methods=['POST'])
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def generate_label_pdf():
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"""Generate a single label PDF for thermal printing via QZ Tray"""
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@@ -510,11 +510,13 @@ async function printLocationBarcode() {
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printStatus.textContent = 'Sending to printer...';
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// Configure QZ Tray for PDF printing with 4x8cm size
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// Configure QZ Tray for PDF printing with 8x5cm size in landscape
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const config = qzTray.configs.create(selectedPrinter, {
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size: { width: 4, height: 8, units: 'cm' },
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margins: { top: 0, right: 0, bottom: 0, left: 0 },
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orientation: 'portrait'
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scaleContent: false,
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rasterize: false,
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size: { width: 80, height: 50 },
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units: 'mm',
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margins: { top: 0, right: 0, bottom: 0, left: 0 }
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});
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const data = [{
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@@ -3,8 +3,8 @@
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{% block title %}Finish Good Scan{% endblock %}
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{% block head %}
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<link rel="stylesheet" href="{{ url_for('static', filename='css/scan.css') }}">
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<!-- QZ Tray for printing -->
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<script src="https://cdn.jsdelivr.net/npm/qz-tray@2.2.0/qz-tray.min.js"></script>
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<!-- QZ Tray for printing - using local patched version for pairing-key authentication -->
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<script src="{{ url_for('static', filename='qz-tray.js') }}"></script>
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<style>
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.error-message {
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color: #ff4444;
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@@ -714,11 +714,12 @@ document.addEventListener('DOMContentLoaded', function() {
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if (result.success && result.box_number) {
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const boxNumber = result.box_number;
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// Step 2: Print the box label using QZ Tray
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// Step 2: Generate PDF label and print using QZ Tray
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try {
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// Check QZ Tray connection
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if (!window.qz || !window.qz.websocket.isActive()) {
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throw new Error('QZ Tray not connected. Please ensure QZ Tray is running.');
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console.log('QZ Tray not connected, attempting to connect...');
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await window.qz.websocket.connect();
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}
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// Get available printers
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@@ -727,17 +728,59 @@ document.addEventListener('DOMContentLoaded', function() {
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throw new Error('No printers found');
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}
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// Use first available printer
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const printer = printers[0];
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// Try to get default printer, fallback to first available
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let printer;
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try {
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printer = await window.qz.printers.getDefault();
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console.log('Using default printer:', printer);
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} catch (e) {
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printer = printers[0];
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console.log('Default printer not found, using first available:', printer);
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}
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// Create ZPL code for box label
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const zpl = `^XA
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^FO50,50^A0N,40,40^FDBox: ${boxNumber}^FS
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^FO50,120^BY2,3,80^BCN,80,Y,N,N^FD${boxNumber}^FS
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^XZ`;
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// Generate PDF from backend
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const formData = new FormData();
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formData.append('box_number', boxNumber);
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const config = window.qz.configs.create(printer);
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await window.qz.print(config, [zpl]);
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const pdfResponse = await fetch('/generate_box_label_pdf', {
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method: 'POST',
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body: formData
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});
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if (!pdfResponse.ok) {
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throw new Error('Failed to generate PDF label');
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}
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// Get PDF as blob and convert to base64
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const pdfBlob = await pdfResponse.blob();
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const pdfBase64 = await new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onloadend = () => {
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const base64 = reader.result.split(',')[1];
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resolve(base64);
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};
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reader.onerror = reject;
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reader.readAsDataURL(pdfBlob);
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});
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console.log('PDF generated, sending to printer...');
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// Configure QZ Tray for PDF printing
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const config = window.qz.configs.create(printer, {
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scaleContent: false,
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rasterize: false,
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size: { width: 80, height: 50 },
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units: 'mm',
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margins: { top: 0, right: 0, bottom: 0, left: 0 }
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});
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const printData = [{
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type: 'pdf',
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format: 'base64',
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data: pdfBase64
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}];
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await window.qz.print(config, printData);
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showNotification(`✅ Box ${boxNumber} created and label printed!`, 'success');
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@@ -748,8 +791,9 @@ document.addEventListener('DOMContentLoaded', function() {
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} catch (printError) {
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console.error('Print error:', printError);
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showNotification(`⚠️ Box ${boxNumber} created but print failed: ${printError.message}`, 'warning');
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showNotification(`⚠️ Box ${boxNumber} created but print failed: ${printError.message}\n\nPlease ensure QZ Tray is running and a printer is available.`, 'warning');
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// Still keep modal open for manual entry
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document.getElementById('scan-box-input').value = boxNumber;
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document.getElementById('scan-box-input').focus();
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}
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@@ -757,11 +801,12 @@ document.addEventListener('DOMContentLoaded', function() {
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throw new Error(result.error || 'Failed to create box');
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}
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} catch (error) {
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console.error('Error creating box:', error);
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showNotification('❌ Error creating box: ' + error.message, 'error');
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} finally {
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// Re-enable button
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this.disabled = false;
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this.textContent = 'Quick Box Label Creation';
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this.textContent = '📦 Quick Box Label Creation';
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}
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});
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@@ -472,6 +472,7 @@ function updateBoxPreview() {
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// QZ Tray functionality
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async function initQZTray() {
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console.log('=== Initializing QZ Tray ===');
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try {
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if (!window.qz) {
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console.error('QZ Tray library not loaded');
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@@ -479,23 +480,42 @@ async function initQZTray() {
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return;
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}
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console.log('QZ Tray library loaded');
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console.log('Current connection status:', window.qz.websocket.isActive());
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if (!window.qz.websocket.isActive()) {
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console.log('Connecting to QZ Tray...');
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await window.qz.websocket.connect();
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console.log('Connected to QZ Tray successfully');
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} else {
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console.log('Already connected to QZ Tray');
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}
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await loadPrinters();
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document.getElementById('print-status').innerHTML = '<span style="color: green;">✓ QZ Tray connected</span>';
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setTimeout(() => {
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document.getElementById('print-status').innerHTML = '';
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}, 2000);
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} catch (e) {
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console.error('QZ Tray initialization failed:', e);
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document.getElementById('print-status').innerHTML = '<span style="color: red;">QZ Tray not connected</span>';
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console.error('=== QZ Tray initialization failed ===');
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console.error('Error:', e);
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console.error('Error message:', e.message);
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document.getElementById('print-status').innerHTML = '<span style="color: red;">QZ Tray not connected - ' + e.message + '</span>';
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}
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}
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async function loadPrinters() {
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console.log('Loading printers...');
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try {
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const printers = await window.qz.printers.find();
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console.log('Printers found:', printers);
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const printerSelect = document.getElementById('printer-select');
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printerSelect.innerHTML = '';
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if (printers.length === 0) {
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console.warn('No printers found');
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printerSelect.innerHTML = '<option value="">No printers found</option>';
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return;
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}
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@@ -510,6 +530,7 @@ async function loadPrinters() {
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// Select first printer by default
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if (printers.length > 0) {
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printerSelect.value = printers[0];
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console.log('Default printer selected:', printers[0]);
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}
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} catch (e) {
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console.error('Error loading printers:', e);
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@@ -563,6 +584,9 @@ function selectAndShowLabel(boxId, boxNumber, buttonElement) {
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}
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document.getElementById('print-box-btn').addEventListener('click', async function() {
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console.log('=== PRINT BUTTON CLICKED ===');
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console.log('Selected box number:', selectedBoxNumber);
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if (!selectedBoxNumber) {
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showNotification('Please select a box from the table', 'warning');
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return;
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@@ -571,33 +595,97 @@ document.getElementById('print-box-btn').addEventListener('click', async functio
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const printerSelect = document.getElementById('printer-select');
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const selectedPrinter = printerSelect.value;
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console.log('Selected printer:', selectedPrinter);
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if (!selectedPrinter) {
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showNotification('Please select a printer', 'warning');
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return;
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}
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try {
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document.getElementById('print-status').innerHTML = '<span style="color: blue;">Printing...</span>';
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// Check QZ Tray connection status
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console.log('Checking QZ Tray connection...');
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if (!window.qz.websocket.isActive()) {
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console.log('QZ Tray not connected, attempting to reconnect...');
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document.getElementById('print-status').innerHTML = '<span style="color: blue;">Reconnecting to QZ Tray...</span>';
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await window.qz.websocket.connect();
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await loadPrinters();
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console.log('Reconnected to QZ Tray');
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} else {
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console.log('QZ Tray already connected');
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}
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// Create ZPL code for box label
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const zpl = `^XA
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^FO50,50^A0N,40,40^FDBox: ${selectedBoxNumber}^FS
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^FO50,120^BY2,3,80^BCN,80,Y,N,N^FD${selectedBoxNumber}^FS
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^XZ`;
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document.getElementById('print-status').innerHTML = '<span style="color: blue;">Generating PDF...</span>';
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const config = window.qz.configs.create(selectedPrinter);
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await window.qz.print(config, [zpl]);
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// Create FormData to send to backend
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const formData = new FormData();
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formData.append('box_number', selectedBoxNumber);
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showNotification('Box label printed successfully!', 'success');
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document.getElementById('print-status').innerHTML = '<span style="color: green;">✓ Printed successfully</span>';
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// Send to backend to generate PDF
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const response = await fetch('/generate_box_label_pdf', {
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method: 'POST',
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body: formData
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});
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if (!response.ok) {
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const errorData = await response.json();
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throw new Error(errorData.error || 'Failed to generate PDF');
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}
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// Get PDF as blob
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const pdfBlob = await response.blob();
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console.log('PDF generated successfully');
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document.getElementById('print-status').innerHTML = '<span style="color: blue;">Sending to printer...</span>';
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// Convert blob to base64 for QZ Tray
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const pdfBase64 = await new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onloadend = () => {
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const base64 = reader.result.split(',')[1];
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resolve(base64);
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};
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reader.onerror = reject;
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reader.readAsDataURL(pdfBlob);
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});
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console.log('PDF converted to base64');
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// Configure QZ Tray for PDF printing
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const config = window.qz.configs.create(selectedPrinter, {
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scaleContent: false,
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rasterize: false,
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size: { width: 80, height: 50 },
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units: 'mm',
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margins: { top: 0, right: 0, bottom: 0, left: 0 }
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});
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console.log('Print config created:', config);
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// Prepare PDF data for QZ Tray
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const printData = [{
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type: 'pdf',
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format: 'base64',
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data: pdfBase64
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}];
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console.log('Sending print command...');
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const result = await window.qz.print(config, printData);
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console.log('Print command result:', result);
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showNotification('Box label sent to printer successfully!', 'success');
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document.getElementById('print-status').innerHTML = '<span style="color: green;">✓ Sent to printer successfully</span>';
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setTimeout(() => {
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document.getElementById('print-status').innerHTML = '';
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}, 3000);
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} catch (e) {
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console.error('Print error:', e);
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console.error('=== PRINT ERROR ===');
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console.error('Error details:', e);
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console.error('Error message:', e.message);
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console.error('Error stack:', e.stack);
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showNotification('Print failed: ' + e.message, 'error');
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document.getElementById('print-status').innerHTML = '<span style="color: red;">Print failed</span>';
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document.getElementById('print-status').innerHTML = '<span style="color: red;">Print failed: ' + e.message + '</span>';
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}
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});
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</script>
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|
||||
@@ -3,7 +3,7 @@ from flask import current_app, request, render_template, session, redirect, url_
|
||||
import csv, os, tempfile
|
||||
from reportlab.lib.pagesizes import letter
|
||||
from reportlab.pdfgen import canvas
|
||||
from reportlab.lib.units import cm
|
||||
from reportlab.lib.units import cm, mm
|
||||
from reportlab.graphics.barcode import code128
|
||||
import io
|
||||
|
||||
@@ -255,7 +255,7 @@ def import_locations_csv_handler():
|
||||
return render_template('import_locations_csv.html', report=report, locations=locations)
|
||||
|
||||
def generate_location_label_pdf():
|
||||
"""Generate PDF for location barcode label (8x4cm)"""
|
||||
"""Generate PDF for location barcode label (8cm x 5cm landscape)"""
|
||||
try:
|
||||
data = request.get_json()
|
||||
location_code = data.get('location_code', '')
|
||||
@@ -263,46 +263,93 @@ def generate_location_label_pdf():
|
||||
if not location_code:
|
||||
return jsonify({'error': 'Location code is required'}), 400
|
||||
|
||||
print(f"DEBUG: Generating location label PDF for: {location_code}")
|
||||
|
||||
# Create PDF in memory
|
||||
buffer = io.BytesIO()
|
||||
|
||||
# Create PDF with 8x4cm page size (width x height)
|
||||
page_width = 8 * cm
|
||||
page_height = 4 * cm
|
||||
# Create PDF with 8cm x 5cm page size in landscape orientation
|
||||
page_width = 80 * mm # 8 cm
|
||||
page_height = 50 * mm # 5 cm
|
||||
|
||||
c = canvas.Canvas(buffer, pagesize=(page_width, page_height))
|
||||
|
||||
# Generate Code128 barcode
|
||||
barcode = code128.Code128(location_code, barWidth=1.0, humanReadable=False)
|
||||
# Optimize for label printer
|
||||
c.setPageCompression(1)
|
||||
c.setCreator("Trasabilitate Location Label System")
|
||||
c.setTitle("Location Label - Optimized for Label Printers")
|
||||
|
||||
# Calculate the desired barcode dimensions (fill most of the label)
|
||||
desired_barcode_width = 7 * cm # Almost full width
|
||||
desired_barcode_height = 2.5 * cm # Most of the height
|
||||
# Define margins and usable area
|
||||
margin = 2 * mm
|
||||
usable_width = page_width - (2 * margin)
|
||||
usable_height = page_height - (2 * margin)
|
||||
|
||||
# Calculate scaling factor to fit the desired width
|
||||
scale = desired_barcode_width / barcode.width
|
||||
# Calculate vertical layout
|
||||
# Top section: "Location nr: XXXX" text
|
||||
# Bottom section: Barcode
|
||||
text_height = 12 * mm # Space for text at top
|
||||
barcode_height = usable_height - text_height - (1 * mm) # Rest for barcode with minimal spacing
|
||||
|
||||
# Calculate actual dimensions after scaling
|
||||
actual_width = barcode.width * scale
|
||||
actual_height = barcode.height * scale
|
||||
# === TOP SECTION: Location Nr Label ===
|
||||
# Position from top of usable area
|
||||
text_y = page_height - margin - text_height
|
||||
|
||||
# Center the barcode on the label
|
||||
barcode_x = (page_width - actual_width) / 2
|
||||
barcode_y = (page_height - actual_height) / 2 + 0.3 * cm # Slightly above center for text space
|
||||
# Draw "Location nr:" label
|
||||
c.setFont("Helvetica-Bold", 14)
|
||||
label_text = "Location nr:"
|
||||
label_width = c.stringWidth(label_text, "Helvetica-Bold", 14)
|
||||
|
||||
# Draw barcode with scaling
|
||||
# Draw location code
|
||||
c.setFont("Helvetica-Bold", 18)
|
||||
code_text = location_code
|
||||
code_width = c.stringWidth(code_text, "Helvetica-Bold", 18)
|
||||
|
||||
# Calculate total width and center everything
|
||||
total_text_width = label_width + 3*mm + code_width # 3mm spacing between label and code
|
||||
start_x = margin + (usable_width - total_text_width) / 2
|
||||
|
||||
# Draw label text
|
||||
c.setFont("Helvetica-Bold", 14)
|
||||
c.drawString(start_x, text_y + 5*mm, label_text)
|
||||
|
||||
# Draw location code
|
||||
c.setFont("Helvetica-Bold", 18)
|
||||
c.drawString(start_x + label_width + 3*mm, text_y + 5*mm, code_text)
|
||||
|
||||
# === BOTTOM SECTION: Barcode ===
|
||||
barcode_y = margin
|
||||
|
||||
try:
|
||||
# Create barcode for location code
|
||||
barcode = code128.Code128(
|
||||
location_code,
|
||||
barWidth=0.4*mm, # Thicker bars for better scanning
|
||||
barHeight=barcode_height,
|
||||
humanReadable=True,
|
||||
fontSize=10
|
||||
)
|
||||
|
||||
# Calculate scaling to fit width
|
||||
scale_factor = usable_width / barcode.width
|
||||
|
||||
# Center the barcode horizontally
|
||||
barcode_x = margin + (usable_width - (barcode.width * scale_factor)) / 2
|
||||
|
||||
# Draw the barcode
|
||||
c.saveState()
|
||||
c.translate(barcode_x, barcode_y)
|
||||
c.scale(scale, scale)
|
||||
c.scale(scale_factor, 1)
|
||||
barcode.drawOn(c, 0, 0)
|
||||
c.restoreState()
|
||||
|
||||
# Add location code text below barcode
|
||||
c.setFont("Helvetica-Bold", 10)
|
||||
text_width = c.stringWidth(location_code, "Helvetica-Bold", 10)
|
||||
text_x = (page_width - text_width) / 2
|
||||
text_y = barcode_y - 0.5 * cm # Below the barcode
|
||||
c.drawString(text_x, text_y, location_code)
|
||||
print(f"DEBUG: Barcode generated successfully with scale factor: {scale_factor}")
|
||||
|
||||
except Exception as e:
|
||||
print(f"DEBUG: Error generating barcode: {e}")
|
||||
# Fallback: draw text if barcode fails
|
||||
c.setFont("Helvetica-Bold", 12)
|
||||
text_width = c.stringWidth(location_code, "Helvetica-Bold", 12)
|
||||
c.drawString((page_width - text_width) / 2, barcode_y + barcode_height/2, location_code)
|
||||
|
||||
# Finalize PDF
|
||||
c.save()
|
||||
@@ -313,10 +360,13 @@ def generate_location_label_pdf():
|
||||
response.headers['Content-Type'] = 'application/pdf'
|
||||
response.headers['Content-Disposition'] = f'inline; filename=location_{location_code}_label.pdf'
|
||||
|
||||
print(f"DEBUG: Location label PDF generated successfully")
|
||||
return response
|
||||
|
||||
except Exception as e:
|
||||
print(f"Error generating location label PDF: {e}")
|
||||
import traceback
|
||||
traceback.print_exc()
|
||||
return jsonify({'error': str(e)}), 500
|
||||
|
||||
def update_location(location_id, location_code, size, description):
|
||||
|
||||
Reference in New Issue
Block a user