from opcua import ua, Client


class Py2opcua:

    def __init__(self, url='opc.tcp://192.168.2.99:4840'):
        self.client = Client(url)

    def connect(self):

        try:
            # 连接客户端
            self.client.connect()
            print("opcua服务器连接成功，可以写入")
            return self.client
        except:
            print("opcua服务器连接失败，请检查")

    def write(self, temp_dict):
        temp_dict = temp_dict
        temp_list = list(temp_dict.items())
        for i in range(len(temp_list)):
            # 寻找节点上的变量
            var = self.client.get_node(temp_list[i][0])
            # var.set_value(ua.Variant(1.234, ua.VariantType.Float))
            # 通过set_value写值
            var.set_value(ua.Variant(temp_list[i][1], ua.VariantType.Double))
            print("%s 已写入" % var.get_value())

    def disconnect(self):
        # 断开连接
        self.client.disconnect()