231 lines
8.1 KiB
Python
231 lines
8.1 KiB
Python
import socket
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import base64
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import os
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from io import BytesIO
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from PIL import Image, ImageDraw, ImageFont
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# 引入条形码生成库
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try:
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import barcode
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from barcode.writer import ImageWriter
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except ImportError:
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print("❌ 警告: 未安装 python-barcode 库，无法生成真实条形码。请执行: pip install python-barcode")
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class LabelPrintService:
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PRINTER_IP = "192.168.9.205"
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PRINTER_PORT = 9100
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# ================= 1. 尺寸与分辨率配置 (300 DPI) =================
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DOTS_PER_MM = 12 # 300 DPI
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LABEL_WIDTH_MM = 40
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LABEL_HEIGHT_MM = 30
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# 画布像素: 40mm -> 480px, 30mm -> 360px
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LABEL_WIDTH = int(LABEL_WIDTH_MM * DOTS_PER_MM)
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LABEL_HEIGHT = int(LABEL_HEIGHT_MM * DOTS_PER_MM)
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# 顶部留白: 10mm (120px) - 内容从这里开始
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TOP_MARGIN_MM = 2
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TOP_MARGIN_PX = int(TOP_MARGIN_MM * DOTS_PER_MM)
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@staticmethod
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def _get_font(size):
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"""获取字体"""
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# 尝试加载中文字体，否则乱码
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font_names = ["simhei.ttf", "msyh.ttf", "SimHei.ttf", "arial.ttf"]
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base_dirs = [os.getcwd(), os.path.dirname(__file__)]
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for d in base_dirs:
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for name in font_names:
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path = os.path.join(d, name)
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if os.path.exists(path):
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return ImageFont.truetype(path, size)
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return ImageFont.load_default()
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@staticmethod
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def _generate_barcode_image(content, width_px, height_px):
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"""
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生成真实的条形码图片
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"""
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try:
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# 确保内容字符串有效
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if not content:
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content = "0000000000"
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# 使用 Code128 编码（通用性最强）
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code128 = barcode.get('code128', content, writer=ImageWriter())
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# 渲染到内存
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buffer = BytesIO()
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# write_text=False: 不在条码下方生成自带的数字（我们自己画）
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code128.write(buffer, options={"write_text": False, "module_height": 10.0, "quiet_zone": 1.0})
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# 打开生成的条码图
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buffer.seek(0)
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bc_img = Image.open(buffer)
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# 强制调整大小以适应我们的布局
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return bc_img.resize((width_px, height_px), Image.Resampling.LANCZOS)
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except Exception as e:
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print(f"条形码生成失败: {e}")
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# 生成失败时返回一个黑色方块占位
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return Image.new('RGB', (width_px, height_px), color='black')
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@staticmethod
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def _create_image_object(data):
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"""
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[绘图层] 生成标签图片
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"""
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# 1. 创建画布 (白底)
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img = Image.new('RGB', (LabelPrintService.LABEL_WIDTH, LabelPrintService.LABEL_HEIGHT), color='white')
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d = ImageDraw.Draw(img)
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# 2. 统一字体配置 (字号 30)
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UNIFIED_FONT_SIZE = 30
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font = LabelPrintService._get_font(UNIFIED_FONT_SIZE)
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# 3. 提取条码内容 (优先使用 SKU)
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# 逻辑：使用自动生成的 SKU (如 00000001) 作为条码内容
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sku_code = data.get('sku')
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if not sku_code:
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# 兜底逻辑：如果没有 SKU，尝试用 serial_number 或 global_id
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sku_code = data.get('serial_number') or str(data.get('global_print_id', '0000000000')).zfill(10)
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# ==================== 绘制布局 ====================
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# X 轴偏移 (5mm)
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GLOBAL_OFFSET_X = int(2 * LabelPrintService.DOTS_PER_MM)
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# Y 轴起始: 10mm 处
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CURRENT_Y = LabelPrintService.TOP_MARGIN_PX
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# --- A. 绘制真实条形码 (内容为 SKU) ---
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bc_w = int(35 * LabelPrintService.DOTS_PER_MM) # 条码宽约 28mm
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bc_h = int(10 * LabelPrintService.DOTS_PER_MM) # 条码高约 6mm
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# 生成并粘贴条码
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bc_img = LabelPrintService._generate_barcode_image(sku_code, bc_w, bc_h)
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# 粘贴位置: (X, Y)
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img.paste(bc_img, (GLOBAL_OFFSET_X - 10, CURRENT_Y))
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# 更新 Y 坐标 (条码高度 + 间距)
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CURRENT_Y += bc_h + 5
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# --- B. 绘制文字 (统一加粗) ---
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# 准备数据 (名称、规格等)
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name = str(data.get('material_name', '') or '-')
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if len(name) > 8: name = name[:7] + ".."
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spec = str(data.get('spec_model', '') or '-')
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if len(spec) > 11: spec = spec[:10] + ".."
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loc = str(data.get('warehouse_loc', '') or '-')
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cat = str(data.get('category', '') or '')
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typ = str(data.get('material_type', '') or '')
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attr = f"{cat}/{typ}"
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if len(attr) > 11: attr = attr[:10] + ".."
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# -----------------------------------------------------------
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# [修改点] 底部显示的文字：不再显示 NO.SKU，而是显示 SN 或 BN
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# -----------------------------------------------------------
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bottom_text = ""
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# 1. 优先检查前端是否传了明确的 print_no (打印值) 和 print_label (序/批)
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if data.get('print_no'):
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val = str(data.get('print_no'))
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label_type = data.get('print_label', '')
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if label_type == '序':
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bottom_text = f"SN: {val}"
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elif label_type == '批':
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bottom_text = f"BN: {val}"
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else:
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bottom_text = f"NO: {val}"
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# 2. 如果没有前端打印参数，检查数据中的序列号
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elif data.get('serial_number'):
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bottom_text = f"SN: {data.get('serial_number')}"
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# 3. 检查数据中的批号
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elif data.get('batch_number'):
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bottom_text = f"BN: {data.get('batch_number')}"
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# 4. 兜底 (如果什么都没有，才显示 SKU)
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else:
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bottom_text = f"NO: {sku_code}"
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# -----------------------------------------------------------
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lines = [
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f"名: {name}",
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f"规: {spec}",
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f"库: {loc}",
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f"属: {attr}",
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f"{bottom_text}" # 这里放置计算好的 SN/BN 文字
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]
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line_height = 36 # 行高 (字号30 + 6间距)
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for line in lines:
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# 边界检查
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if CURRENT_Y + UNIFIED_FONT_SIZE > LabelPrintService.LABEL_HEIGHT:
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break
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# 绘制文字 (stroke_width=1 实现加粗效果)
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d.text((GLOBAL_OFFSET_X, CURRENT_Y), line, font=font, fill='black', stroke_width=1, stroke_fill='black')
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CURRENT_Y += line_height
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return img
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@staticmethod
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def generate_preview_image(data):
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img = LabelPrintService._create_image_object(data)
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output_buffer = BytesIO()
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img.save(output_buffer, format='JPEG')
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base64_str = base64.b64encode(output_buffer.getvalue()).decode('utf-8')
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return f"data:image/jpeg;base64,{base64_str}"
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@staticmethod
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def send_to_printer(data):
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ip = LabelPrintService.PRINTER_IP
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port = LabelPrintService.PRINTER_PORT
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try:
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# 1. 获取图像 (RGB)
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img_rgb = LabelPrintService._create_image_object(data)
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# 2. 图像转二值化 (白=1, 黑=0 的逻辑，不反转)
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img_gray = img_rgb.convert('L')
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img_bw = img_gray.convert('1', dither=Image.Dither.NONE)
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# 获取位图数据
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bitmap_data = img_bw.tobytes()
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width_bytes = (img_bw.width + 7) // 8
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height_dots = img_bw.height
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# 3. TSPL 指令
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header = (
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f"SIZE {LabelPrintService.LABEL_WIDTH_MM} mm, {LabelPrintService.LABEL_HEIGHT_MM} mm\r\n"
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"GAP 2 mm, 0 mm\r\n"
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"CLS\r\n"
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"DIRECTION 1\r\n"
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"REFERENCE 0, 0\r\n"
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).encode('gbk')
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bitmap_cmd = f"BITMAP 0,0,{width_bytes},{height_dots},0,".encode('gbk')
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footer = b"\r\nPRINT 1,1\r\n"
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# 4. 发送
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(5)
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s.connect((ip, port))
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s.sendall(header + bitmap_cmd + bitmap_data + footer)
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s.close()
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return True
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except Exception as e:
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print(f"❌ 打印异常: {e}")
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raise Exception(f"打印机连接失败: {str(e)}") |