Unity3d热更新之下载

Posted 2020-09-02

热更新框架：uluaFramework_UIGUI-master，在Unity热更新时，先释放资源（StreamingAssets --> DataPath），再从服务端下载资源（或者其它下载网络文件的时候）

（1）下载方案

启动一个线程，每隔几毫秒询问队列，队列中下载Action数大于0，则开启异步下载

（2）异步下载异常处理

我用windows自带的iis搭建的web服务，在下载资源时始终下载不下来，但又没有异常提示。luaFramework使用WebClient.DownloadFileAsync时，若下载发生异常，并没有做异常处理

解决办法：

WebClient异步下载时，tryCatch捕捉不到异常，需要在WebClient.DownloadFileComplete回调中捕捉

 

using UnityEngine;
using System.Collections;
using System.Threading;
using System.Collections.Generic;
using System;
using System.Net;
using System.Diagnostics;
using Debug = UnityEngine.Debug;
using System.ComponentModel;
/// <summary>
/// 下载事务
/// </summary>
public class DownloadEvent
{
    /// <summary>
    /// 下载事务名称（这里是下载的文件名）
    /// </summary>
    public string evName;
    /// <summary>
    /// 下载的远程、本地Url
    /// </summary>
    public List<object> evParams = new List<object>();
    public DownloadEvent(string name, List<object> list)
    {
        this.evName = name;
        this.evParams = list;
    }
}
public class ThreadManager : MonoBehaviour
{
    public Thread thread;
    public Queue<DownloadEvent> events = new Queue<DownloadEvent>();
    /// <summary>
    /// 计时器
    /// </summary>
    Stopwatch sw = new Stopwatch();
    static readonly object lockObject = new object();
    void Start()
    {
        thread = new Thread(OnUpdate);
        thread.Start();
        List<object> list1 = new List<object>();
        list1.Add("http://localhost/StreamingAssets/StreamingAssets");
        list1.Add("d:/StreamingAssets/StreamingAssets");
        DownloadEvent ev1 = new DownloadEvent("StreamingAssets", list1);
        List<object> list2 = new List<object>();
        list2.Add("http://localhost/StreamingAssets/shared_asset.unity3d");
        list2.Add("d:/StreamingAssets/shared_asset.unity3d");
        DownloadEvent ev2 = new DownloadEvent("shared_asset.unity3d", list2);
        events.Enqueue(ev1);
        events.Enqueue(ev2);
    }
    void OnUpdate()
    {
        while (true)
        {
            lock (lockObject)
            {
                if (events.Count > 0)
                {
                    Debug.Log(events.Count);
                    DownloadEvent ev = events.Dequeue();
                    DownloadFile(ev);
                    Debug.Log("开始下载文件：" + ev.evName);
                }
            }
            Thread.Sleep(1);
        }
    }
    /// <summary>
    /// 下载文件
    /// </summary>
    /// <param name="ev">下载事务</param>
    private void DownloadFile(DownloadEvent ev)
    {
        //url
        string url = ev.evParams[0].ToString();
        string localPath = ev.evParams[1].ToString();
        using (WebClient client = new WebClient())
        {
            //sw.Start();   //计时器，可以用于计算下载速度
            client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProcesChange);
            client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadComplete);
            client.DownloadFileAsync(new Uri(url), ev.evName);
        }
    }
    /// <summary>
    /// 异常处理回调
    /// </summary>
    private void DownloadComplete(object sender, AsyncCompletedEventArgs e)
    {
        if (e.Error!=null)
        {
            Debug.LogError(e.Error.Message);
        }
    }
    /// <summary>
    /// 下载回调
    /// </summary>
    private void DownloadProcesChange(object sender, DownloadProgressChangedEventArgs e)
    {
        string received = (e.BytesReceived / 1024d) + "";
        Debug.Log("sender：" + sender);
        Debug.Log("接收文件大小：" + received + "K");
        if (e.ProgressPercentage == 100 && e.BytesReceived == e.TotalBytesToReceive)
        {
            Debug.Log("下载完成");
        }
    }
}