C#、unity 和 Mqtt

Question

你好，我刚开始接触 C#。我正在使用 C# 统一学生项目。通常所有代码都适用于 private void ToggleUI (bool _value) 函数。一旦到达 private void Subscribe ()，问题就开始了。当我编译我的代码时，我收到一个我不理解的错误“找不到类型或命名空间名称 MqttMsgPublishEventArgs”。这是有问题的代码。你能给我一些线索吗？

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;

public class Waypoint1 : MonoBehaviour
{
    private Image iconImg;
    private Text distanceText;
    public Transform player;
    public Transform target;
    public Camera cam;
    
    public float closeEnoughDist;
    
    private void Start()
    {
      iconImg=GetComponent<Image>();
      distanceText=GetComponentInChildren<Text>();
    }

    
    private void Update()
    {
        if(target != null)
            target.position = new Vector3(7f, 0, 5f);
            GetDistance();
            CheckOnScreen();
    }
    
    private void GetDistance()
    {
        float dist=Vector3.Distance(player.position, target.position);
        distanceText.text=dist.ToString("f1") +"m";
        
        if(dist<closeEnoughDist)
            Destroy(gameObject);
        
    }
    
    private void CheckOnScreen()
    {
        float thing=Vector3.Dot((target.position-cam.transform.position).normalized, cam.transform.forward);
        if(thing<=0)
            ToggleUI(false);
        else
            ToggleUI(true);
            transform.position=cam.WorldToScreenPoint(target.position);
            
    }
    
    private void ToggleUI(bool _value)
    {
        iconImg.enabled=_value;
        distanceText.enabled=_value;
    }
    
    
    private void Subscribe()
    {
        // create client instance (both host name and IP address work nicely)
        MqttClient client = new MqttClient("<10.214.0.163>");

        // register to message received 
        client.MqttMsgPublishReceived += client_MqttMsgPublishReceived;

        string clientId = Guid.NewGuid().ToString();
        client.Connect(clientId);
    
        // subscribe to the topic "unity" with QoS 2 
        client.Subscribe(new string[] { "unity" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
    }

     void client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
    {
        // handle message received 
        Console.WriteLine("Received = " + Encoding.UTF8.GetString(e.Message) + " on topic " + e.Topic);
    }
}

Answer 1

您缺少这些 using 语句：

using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

这是一个示例项目，应该可以帮助您解决问题： https://github.com/gpvigano/M2MqttUnity

C#、unity 和 Mqtt

C#,unity and Mqtt

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