Improve GUI and barcode generation
- Update GUI title to 'Label Printing' with white text - Add character limit (25 chars) to all input fields - Add number-only filter to quantity field - Fix barcode generation in PDF module - Create pdf_backup folder for storing generated PDFs - Add pdf backup logging and confirmation - Move demo files and tests to documentation folder - Reorganize project structure for better clarity
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Quality App Developer
295
print_label_pdf.py
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295
print_label_pdf.py
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"""
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PDF-based Label Printing Module
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Generates high-quality PDF labels with barcodes for printing.
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Uses reportlab for superior PDF generation compared to PNG rasterization.
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Simplified layout: no borders, just field names and barcodes.
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"""
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from reportlab.lib.pagesizes import landscape
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from reportlab.lib.units import cm, mm
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from reportlab.pdfgen import canvas
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from barcode import Code128
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from barcode.writer import ImageWriter
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import io
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from PIL import Image
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import os
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import tempfile
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import datetime
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class PDFLabelGenerator:
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"""Generate high-quality PDF labels with barcodes"""
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def __init__(self, label_width=11.5, label_height=8, dpi=300):
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"""
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Initialize PDF label generator.
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Args:
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label_width (float): Width in cm (default 11.5 cm)
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label_height (float): Height in cm (default 8 cm)
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dpi (int): DPI for barcode generation (default 300 for print quality)
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"""
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self.label_width = label_width * cm
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self.label_height = label_height * cm
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self.dpi = dpi
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self.margin = 3 * mm # Minimal margin
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def generate_barcode_image(self, value, height_mm=18):
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"""
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Generate barcode image from text value.
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Args:
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value (str): Text to encode in barcode (max 25 chars)
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height_mm (int): Barcode height in mm (default 18mm for 1.8cm)
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Returns:
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PIL.Image or None: Generated barcode image
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"""
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if not value or not value.strip():
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return None
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try:
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# Truncate to 25 characters (Code128 limitation)
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value_truncated = value.strip()[:25]
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# Create barcode
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barcode_instance = Code128(value_truncated, writer=ImageWriter())
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# Generate in memory using a temporary directory
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temp_dir = tempfile.gettempdir()
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temp_name = f"barcode_{datetime.datetime.now().strftime('%Y%m%d_%H%M%S_%f')}"
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temp_base_path = os.path.join(temp_dir, temp_name)
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# Barcode options - generate at high DPI for quality
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options = {
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'write_text': False,
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'module_width': 0.5, # Width of each bar in mm
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'module_height': 8, # Height in mm
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'quiet_zone': 2,
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'font_size': 0
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}
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barcode_instance.save(temp_base_path, options=options)
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# The barcode.save() adds .png extension automatically
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temp_path = temp_base_path + '.png'
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# Load and return image
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img = Image.open(temp_path)
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# Convert to RGB if needed
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if img.mode != 'RGB':
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img = img.convert('RGB')
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# Clean up temp file
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try:
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os.remove(temp_path)
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except:
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pass
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return img
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except Exception as e:
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# Log error but don't fail silently
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print(f"Barcode generation error for '{value}': {e}")
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return None
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def create_label_pdf(self, sap_nr, cantitate, lot_number, filename=None):
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"""
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Create a PDF label with three rows of data and barcodes.
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Each row shows label name, barcode, and value text.
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Args:
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sap_nr (str): SAP article number
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cantitate (str): Quantity value
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lot_number (str): Lot/Cable ID
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filename (str): Output filename (if None, returns bytes)
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Returns:
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bytes or str: PDF content as bytes or filename if saved
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"""
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# Prepare data for rows
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rows_data = [
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("SAP-Nr", sap_nr),
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("Cantitate", cantitate),
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("Lot Nr", lot_number),
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]
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# Create PDF canvas in memory or to file
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if filename:
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pdf_buffer = filename
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else:
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pdf_buffer = io.BytesIO()
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# Create canvas with label dimensions
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c = canvas.Canvas(pdf_buffer, pagesize=(self.label_width, self.label_height))
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# Calculate dimensions
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usable_width = self.label_width - 2 * self.margin
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row_height = (self.label_height - 2 * self.margin) / 3
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# Draw each row - label name, barcode, and value text
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for idx, (label_name, value) in enumerate(rows_data):
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y_position = self.label_height - self.margin - (idx + 1) * row_height
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# Draw label name (small, at top of row)
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c.setFont("Helvetica-Bold", 8)
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c.drawString(
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self.margin,
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y_position + row_height - 3 * mm,
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label_name
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)
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# Generate and draw barcode if value exists
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if value and value.strip():
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barcode_value = value.strip()[:25]
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# Fixed barcode height: 1.6 cm (16mm) for optimal readability
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barcode_height_mm = 16
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barcode_height = barcode_height_mm * mm
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try:
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barcode_img = self.generate_barcode_image(barcode_value, height_mm=barcode_height_mm)
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if barcode_img:
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# Calculate barcode dimensions
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max_barcode_width = usable_width - 2 * mm
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aspect_ratio = barcode_img.width / barcode_img.height
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barcode_width = barcode_height * aspect_ratio
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# Constrain width to fit in label
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if barcode_width > max_barcode_width:
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barcode_width = max_barcode_width
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# Save barcode temporarily and draw on PDF
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barcode_temp = tempfile.NamedTemporaryFile(suffix='.png', delete=False)
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barcode_path = barcode_temp.name
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barcode_temp.close()
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barcode_img.save(barcode_path, 'PNG')
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# Position barcode vertically centered in middle of row
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barcode_y = y_position + (row_height - barcode_height) / 2
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# Draw barcode image
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c.drawImage(
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barcode_path,
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self.margin,
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barcode_y,
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width=barcode_width,
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height=barcode_height,
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preserveAspectRatio=True
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)
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# Draw small text below barcode showing the value
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c.setFont("Helvetica", 6)
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c.drawString(
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self.margin,
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barcode_y - 3 * mm,
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f"({barcode_value})"
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)
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# Clean up
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try:
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os.remove(barcode_path)
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except:
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pass
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else:
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# If barcode generation failed, show text
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c.setFont("Helvetica", 10)
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c.drawString(
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self.margin,
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y_position + row_height / 2,
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f"[No Barcode: {barcode_value}]"
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)
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except Exception as e:
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# Fallback: draw value as text with error indicator
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print(f"PDF barcode error: {e}")
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c.setFont("Helvetica", 10)
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c.drawString(
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self.margin,
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y_position + row_height / 2,
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f"[Text: {barcode_value}]"
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)
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else:
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# Empty value - show placeholder
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c.setFont("Helvetica", 8)
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c.drawString(
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self.margin,
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y_position + row_height / 2,
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"(empty)"
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)
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# Save PDF
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c.save()
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# Return filename or bytes
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if filename:
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return filename
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else:
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pdf_buffer.seek(0)
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return pdf_buffer.getvalue()
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def create_label_pdf_file(self, sap_nr, cantitate, lot_number, filename=None):
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"""
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Create PDF label file and return the filename.
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Args:
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sap_nr (str): SAP article number
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cantitate (str): Quantity value
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lot_number (str): Lot/Cable ID
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filename (str): Output filename (if None, auto-generates)
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Returns:
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str: Path to created PDF file
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"""
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if not filename:
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timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
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filename = f"label_{timestamp}.pdf"
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return self.create_label_pdf(sap_nr, cantitate, lot_number, filename)
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def create_label_pdf_simple(text):
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"""
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Simple wrapper to create PDF from combined text (SAP|CANTITATE|LOT).
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Args:
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text (str): Combined text in format "SAP|CANTITATE|LOT"
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Returns:
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bytes: PDF content
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"""
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# Parse text
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parts = text.split('|') if '|' in text else [text, '', '']
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sap_nr = parts[0].strip() if len(parts) > 0 else ''
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cantitate = parts[1].strip() if len(parts) > 1 else ''
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lot_number = parts[2].strip() if len(parts) > 2 else ''
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generator = PDFLabelGenerator()
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pdf_bytes = generator.create_label_pdf(sap_nr, cantitate, lot_number)
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return pdf_bytes
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def create_label_pdf_file(text, filename=None):
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"""
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Create PDF label file from combined text.
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Args:
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text (str): Combined text in format "SAP|CANTITATE|LOT"
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filename (str): Output filename (auto-generates if None)
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Returns:
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str: Path to created PDF file
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"""
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# Parse text
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parts = text.split('|') if '|' in text else [text, '', '']
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sap_nr = parts[0].strip() if len(parts) > 0 else ''
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cantitate = parts[1].strip() if len(parts) > 1 else ''
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lot_number = parts[2].strip() if len(parts) > 2 else ''
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if not filename:
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timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
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filename = f"label_{timestamp}.pdf"
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generator = PDFLabelGenerator()
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return generator.create_label_pdf(sap_nr, cantitate, lot_number, filename)
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