add(设备检测、读取管片任务、opcua客户端)

service/opcua_ui_client.py

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+#!/usr/bin/env python3
+from PySide6.QtCore import QObject, Signal
+from opcua import Client, ua
+import time
+from datetime import datetime
+
+class OpcuaUiSignal(QObject):
+    # 定义值变化信号：参数为(node_id, var_name, new_value)
+    value_changed = Signal(str, str, object)
+
+# Opcua回调处理器
+class SubscriptionHandler:
+    def __init__(self, opc_signal:OpcuaUiSignal):
+        # 初始化nodeid→变量名映射表
+        self.node_id_to_name = {}
+        self.opc_signal = opc_signal
+
+    def datachange_notification(self, node, val, data):
+        """
+        python-opcua标准的回调函数
+        :param node: 变化的节点对象
+        :param val: 节点新值
+        :param data: 附加数据（包含时间戳等）
+        """
+        try:
+            # 1. 解析时间戳
+            # time_str = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+            # try:
+            #     utc_time = data.monitored_item.Value.SourceTimestamp
+            #     beijing_time = utc_time + datetime.timedelta(hours=8)
+            #     time_str = beijing_time.strftime('%Y-%m-%d %H:%M:%S')
+            # except:
+            #     pass
+
+            # 2. 获取nodeid并解析变量名
+            node_id = node.nodeid.to_string()
+            # 从映射表获取可读变量名
+            var_name = self.node_id_to_name.get(node_id)
+
+            # 3. 打印变化通知
+            # print(f"\n 节点值发生变化！")
+            # print(f"   节点ID: {node_id}")
+            # print(f"   变量名称: {var_name}")
+            # print(f"   时间: {time_str}")
+            # print(f"   新值: {val}")
+
+            self.opc_signal.value_changed.emit(node_id, var_name, val)
+           
+        except Exception as e:
+            print(f"解析值变化事件失败: {e}")
+            import traceback
+            traceback.print_exc()
+
+class OpcuaUiClient:
+    def __init__(self, server_url="opc.tcp://localhost:4840/zjsh_feed/server/"):
+        """初始化 OPC UA 客户端"""
+        self.client = Client(server_url)
+
+        self.connected = False
+        self.subscription = None
+        self.monitored_items = []
+
+        # 创建Qt信号对象（用于跨线程传递数据）
+        self.opc_signal = OpcuaUiSignal()
+        self.handler = SubscriptionHandler(self.opc_signal)  # 回调处理器
+        # 定义需要监控的变量路径（object_name + var_name）
+        # 格式：(变量可读名称, [object路径, 变量路径])
+        self.target_var_paths = [
+            ("upper_weight", ["2:upper", "2:upper_weight"]),
+            ("lower_weight", ["2:lower", "2:lower_weight"])
+        ]
+        self.node_id_mapping = {}  # 存储nodeid→变量名的映射表
+
+    def connect(self):
+        """连接到服务器"""
+        try:
+            self.client.connect()
+            self.connected = True
+            print(f"成功连接到 OPC UA 服务器: {self.client.server_url}")
+            return True
+        except Exception as e:
+            print(f"连接服务器失败: {e}")
+            return False
+
+    def disconnect(self):
+        """断开连接（包含取消订阅）"""
+        if self.subscription:
+            try:
+                self.subscription.delete()
+                print("已取消节点订阅")
+            except:
+                pass
+        if self.connected:
+            self.client.disconnect()
+            self.connected = False
+            print("已断开与 OPC UA 服务器的连接")
+
+    def build_node_id_mapping(self):
+        """
+        根据object_name+var_name路径获取nodeid,建立映射表
+        """
+        if not self.connected:
+            print("请先连接到服务器")
+            return False
+        
+        try:
+            print("\n 开始构建nodeid映射表...")
+            objects_node = self.client.get_objects_node()  # 获取根Objects节点
+
+            for var_name, path_list in self.target_var_paths:
+                # 根据层级路径找到目标节点
+                target_node = objects_node.get_child(path_list)
+                # 提取nodeid字符串
+                node_id = target_node.nodeid.to_string()
+                # 存入映射表
+                self.node_id_mapping[node_id] = var_name
+                print(f"映射成功: {node_id} → {var_name}")
+            
+            # 将映射表传给回调处理器
+            self.handler.node_id_to_name = self.node_id_mapping
+            return True
+        except Exception as e:
+            print(f"构建映射表失败: {e}")
+            import traceback
+            traceback.print_exc()
+            return False
+
+    def create_multi_subscription(self, interval=500):
+        """订阅多个变量(基于映射表的nodeid)"""
+        if not self.connected:
+            print("请先连接到服务器")
+            return
+        
+        # 先构建映射表，失败则直接返回
+        if not self.node_id_mapping:
+            if not self.build_node_id_mapping():
+                return
+        
+        try:
+            interval = int(interval)
+            # 1. 创建订阅
+            self.subscription = self.client.create_subscription(interval, self.handler)
+            print(f"\n订阅创建成功(间隔：{interval}ms)")
+
+            # 2. 遍历映射表，为每个nodeid创建监控项
+            for node_id, var_name in self.node_id_mapping.items():
+                var_node = self.client.get_node(node_id)
+                monitored_item = self.subscription.subscribe_data_change(var_node)
+                self.monitored_items.append(monitored_item)
+                print(f"已订阅变量: {var_name} (nodeid: {node_id})")
+
+        except Exception as e:
+            print(f"创建批量订阅失败: {e}")
+            import traceback
+            traceback.print_exc()
+
+    def write_value_by_name(self, var_readable_name, value):
+        """
+        根据变量可读名称写入值(主要用于修改方量， 类型为 Double类型)
+        :param var_readable_name: 变量可读名称（如"upper_weight"）
+        :param value: 要写入的值
+        """
+        if not self.connected:
+            print("请先连接到服务器")
+            return
+        
+        # 反向查找：通过变量名找nodeid
+        target_node_id = None
+        for node_id, name in self.node_id_mapping.items():
+            if name == var_readable_name:
+                target_node_id = node_id
+                break
+        
+        if not target_node_id:
+            print(f"未找到变量名 {var_readable_name} 对应的nodeid")
+            return
+        
+        try:
+            target_node = self.client.get_node(target_node_id)
+            # 明确指定值类型为Double，避免类型错误
+            variant = ua.Variant(float(value), ua.VariantType.Double)
+            target_node.set_value(variant)
+        except Exception as e:
+            print(f"写入值失败: {e}")
+