139 lines
4.6 KiB
Python
139 lines
4.6 KiB
Python
import socket
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import os
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from io import BytesIO
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from PIL import Image, ImageDraw
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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("❌ 错误: 请先安装 python-barcode (pip install python-barcode)")
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exit()
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class BarcodeStackTester:
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# 打印机配置
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PRINTER_IP = "192.168.9.205"
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PRINTER_PORT = 9100
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# 纸张配置: 40mm x 30mm @ 300 DPI
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DOTS_PER_MM = 12
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CANVAS_W = int(40 * DOTS_PER_MM) # 480px
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CANVAS_H = int(30 * DOTS_PER_MM) # 360px
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@staticmethod
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def _generate_raw_barcode(content, bar_height_mm=4):
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"""
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生成原始条码图片 (不强制缩放宽度，让其自然生长)
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"""
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try:
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# Code128 自动优化 (数字会被压缩，所以20位数字其实不长)
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writer = ImageWriter()
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# module_width: 条码黑条的最小宽度(mm)。
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# 0.2mm 在 300DPI 下约等于 2.4像素。这是一个比较清晰且节省空间的数值。
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# 如果设得太大(如0.3)，20位可能会超出40mm纸张。
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options = {
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"module_width": 0.2,
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"module_height": bar_height_mm, # 条码高度
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"quiet_zone": 2.0, # 两侧留白(mm)
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"write_text": False, # 【关键】不写文字
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"dpi": 300 # 对应打印机DPI
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}
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code_img = barcode.get('code128', content, writer=writer)
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# 渲染到内存
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buffer = BytesIO()
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code_img.write(buffer, options=options)
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buffer.seek(0)
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return Image.open(buffer)
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except Exception as e:
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print(f"生成失败: {e}")
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return None
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def run_test(self):
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# 1. 创建白色底图 (40x30mm)
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canvas = Image.new('RGB', (self.CANVAS_W, self.CANVAS_H), color='white')
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# 测试用例: 长度从小到大
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test_lengths = [13, 15, 17, 20]
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# 布局参数
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current_y = 20 # 顶部起始留白 (px)
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gap = 10 # 间距 (px)
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print("-" * 50)
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print("🚀 开始生成堆叠条码测试图...")
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for length in test_lengths:
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# 生成全7的内容
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content = "7" * length
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print(f" 正在处理: {length}位 -> {content}")
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# 生成条码 (高度设为5mm左右，方便在一张纸上放下4个)
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bar_img = self._generate_raw_barcode(content, bar_height_mm=5)
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if bar_img:
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# 计算居中位置
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# bar_img.width 是条码生成的自然宽度
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x_pos = (self.CANVAS_W - bar_img.width) // 2
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# 如果宽度超出了纸张 (x_pos < 0)，说明40mm纸打不下这么多位
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if x_pos < 0:
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print(f" ⚠️ 警告: {length}位条码过宽 ({bar_img.width}px > {self.CANVAS_W}px)，可能会被裁切！")
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x_pos = 0
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# 粘贴到画布
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canvas.paste(bar_img, (x_pos, current_y))
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# 更新Y坐标，准备画下一个
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current_y += bar_img.height + gap
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else:
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print(" 生成失败")
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# 2. 保存预览图
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preview_file = "test_stack_preview.jpg"
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canvas.save(preview_file)
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print(f"✅ 图片已生成: {preview_file} (请打开查看宽度是否超出)")
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# 3. 发送打印 (二值化处理)
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self._send_to_printer(canvas)
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def _send_to_printer(self, img_rgb):
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try:
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# 转二值化 (白=1, 黑=0)
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img_bw = img_rgb.convert('L').convert('1', dither=Image.Dither.NONE)
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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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# TSPL 指令
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header = (
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f"SIZE 40 mm, 30 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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).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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print("🖨️ 正在发送打印指令...")
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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((self.PRINTER_IP, self.PRINTER_PORT))
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s.sendall(header + bitmap_cmd + bitmap_data + footer)
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s.close()
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print("✅ 指令已发送")
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except Exception as e:
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print(f"❌ 打印失败: {e}")
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if __name__ == "__main__":
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tester = BarcodeStackTester()
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tester.run_test() |