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72 lines
3.0 KiB
Python
72 lines
3.0 KiB
Python
import socket
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import time
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import csv
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from datetime import datetime
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import threading
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csv_lock = threading.Lock() # 防止多线程写CSV冲突
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def scan_once(ip="192.168.1.50", port_in=2001, port_out=2002,
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csv_file="scan_results.csv", timeout=5, retries=3):
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"""
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改进版扫码函数：
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- 自动重试
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- 全程超时保护
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- 更安全的socket关闭
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- 文件写入加锁
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"""
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def save_result(qrcode):
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timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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with csv_lock:
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with open(csv_file, mode="a", newline="") as f:
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writer = csv.writer(f)
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writer.writerow([timestamp, qrcode])
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print(f"✅ 已保存结果: {timestamp}, {qrcode}")
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result = None
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for attempt in range(1, retries + 1):
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print(f"\n🟡 扫码尝试 {attempt}/{retries} ...")
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try:
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# -------- Step 1: 触发拍照 --------
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with socket.create_connection((ip, port_in), timeout=2) as client_in:
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cmd = "start"
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client_in.sendall(cmd.encode("ascii")) #把字符串转为byte字节流规则是ascii码
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print(f"→ 已发送触发指令: {cmd}")
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# -------- Step 2: 等待识别结果 --------
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with socket.create_connection((ip, port_out), timeout=timeout) as client_out:
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print(f" 已连接相机输出端口 {port_out}，等待结果...")
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# recv最多阻塞timeout秒
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client_out.settimeout(timeout)
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data = client_out.recv(2048).decode("ascii", errors="ignore").strip() #结果输出为ascii字符串，遇到无法解析的字节则忽略
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# .strip()：去掉字符串头尾的空白字符（包括 \n, \r, 空格等），便于后续判断是否为空或写入 CSV。
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if data:
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print(f"📷 识别结果: {data}")
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save_result(data) #调用 save_result(data) 把时间戳 + 识别字符串写入 CSV（线程安全）。
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result = data #把局部变量 result 设为 data，用于函数返回值
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break #如果读取成功跳出重试循环（for attempt in ...），不再进行后续重试。
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else:
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print("⚠️ 相机返回空数据，重试中...")
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except socket.timeout:
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print("⏰ 超时未收到识别结果，重试中...")
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except ConnectionRefusedError:
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print("❌ 无法连接到扫码器端口，请检查设备是否在线。")
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except OSError as e:
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print(f"⚠️ 网络错误: {e}")
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except Exception as e:
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print(f"❌ 未知异常: {e}")
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time.sleep(0.5) # 两次扫描之间稍作延时
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# -------- Step 3: 返回最终结果 --------
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if result:
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print(f"✅ 扫码成功：{result}")
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else:
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print("❌ 多次尝试后仍未获取二维码结果")
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return result
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