KCGL/inventory-backend/app/services/print/network_print_service.py

import socket
import datetime
from .print_config import PrintConfigManager


class NetworkPrintService:
    def __init__(self, ip=None, port=None):
        config = PrintConfigManager.get_config('network_printer')
        self.ip = ip if ip is not None else config['ip']
        self.port = port if port is not None else config['port']

    def _send_to_printer(self, content):
        """
        对于 A4 打印机，后端直接发送 Socket 指令通常无效或导致乱码。
        因此这里只做日志记录，实际打印由前端浏览器完成。
        """
        print(f"--- [后端日志] 收到打印请求 (实际由前端处理) ---\n{content}\n----------------")
        return True, "记录成功"

    def print_outbound_selection(self, items):
        """
        仅记录出库日志，不发送物理指令
        """
        try:
            timestamp = datetime.datetime.now().strftime("%Y-%m-%d %H:%M")
            total_qty = sum([float(i.get('quantity', 0)) for i in items])

            # 简单构造一个日志字符串
            log_content = f"出库时间: {timestamp}, 总数: {int(total_qty)}\n"
            for item in items:
                log_content += f"- {item.get('name')} (规格:{item.get('standard')}) x {item.get('quantity')}\n"

            # 调用虚拟发送
            return self._send_to_printer(log_content)

        except Exception as e:
            print(f"日志记录失败: {e}")
            return True, "记录忽略"  # 即使失败也不要在前端报错

    def print_stocktake_report(self, data):
        # 同样处理
        return self._send_to_printer(f"盘点报告: 应盘{data.get('total')}, 实盘{data.get('scanned')}")