143 lines
4.6 KiB
C#
143 lines
4.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using UnityEngine;
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using UnityEngine.Networking;
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/// <summary>
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/// 用于处理文件下载
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/// </summary>
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internal class XDownloadHandler: DownloadHandlerScript
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{
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string m_SavePath = "";
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string m_TempFilePath = "";
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FileStream fs;
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public long totalFileLen { get; private set; }
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public long downloadedFileLen { get; private set; }
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public string fileName { get; private set; }
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public string dirPath { get; private set; }
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#region 事件
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/// <summary>
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/// 每次下载到数据后回调进度
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/// </summary>
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public Action<float,float> OnProgress = null;
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/// <summary>
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/// 当下载完成后回调下载的文件位置
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/// </summary>
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public Action<int> OnFinish = null;
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#endregion
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/// <summary>
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/// 初始化下载句柄，定义每次下载的数据上限为1M
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/// </summary>
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/// <param name="filePath">保存到本地的文件路径</param>
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public XDownloadHandler(string filePath) : base(new byte[1024 * 1024])
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{
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m_SavePath = filePath.Replace('\\', '/');
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fileName = m_SavePath.Substring(m_SavePath.LastIndexOf('/') + 1);
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dirPath = m_SavePath.Substring(0, m_SavePath.LastIndexOf('/'));
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m_TempFilePath = Path.Combine(dirPath, fileName + ".temp");
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if (!Directory.Exists(dirPath))
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{
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Directory.CreateDirectory(dirPath);
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}
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fs = new FileStream(m_TempFilePath, FileMode.Append, FileAccess.Write);
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downloadedFileLen = fs.Length;
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}
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/// <summary>
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/// 从网络获取数据时候的回调，每帧调用一次
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/// </summary>
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/// <param name="data">接收到的数据字节流，总长度为构造函数定义的200kb，并非所有的数据都是新的</param>
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/// <param name="dataLength">接收到的数据长度，表示data字节流数组中有多少数据是新接收到的，即0-dataLength之间的数据是刚接收到的</param>
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/// <returns>返回true为继续下载，返回false为中断下载</returns>
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protected override bool ReceiveData(byte[] data, int dataLength)
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{
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if (data == null || data.Length == 0)
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{
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Debug.LogFormat("【下载中】 下载文件{0}中，没有获取到数据，下载终止", fileName);
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return false;
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}
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fs?.Write(data, 0, dataLength);
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downloadedFileLen += dataLength;
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OnProgress?.Invoke(downloadedFileLen, totalFileLen);
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return true;
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}
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/// <summary>
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/// 当接受数据完成时的回调
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/// </summary>
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protected override void CompleteContent()
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{
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OnDispose();
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//Debug.LogFormat("【下载完成】 完成对{0}文件的下载，保存路径为{1}", fileName, m_SavePath);
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if (File.Exists(m_TempFilePath))
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{
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if (File.Exists(m_SavePath))
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File.Delete(m_SavePath);
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File.Move(m_TempFilePath, m_SavePath);
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}
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else
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{
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Debug.LogFormat("【下载失败】 下载文件{0}时失败", fileName);
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}
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OnFinish?.Invoke((int)downloadedFileLen);
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}
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public void OnDispose()
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{
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fs?.Close();
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fs?.Dispose();
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}
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/// <summary>
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/// 请求下载时的第一个回调函数，会返回需要接收的文件总长度
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/// </summary>
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/// <param name="contentLength">如果是续传，则是剩下的文件大小；本地拷贝则是文件总长度</param>
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protected override void ReceiveContentLengthHeader(ulong contentLength)
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{
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if (contentLength == 0)
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{
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Debug.Log("【下载已经完成】");
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CompleteContent();
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}
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base.ReceiveContentLengthHeader(contentLength);
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totalFileLen = (long)contentLength + downloadedFileLen;
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}
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public void ErrorDispose()
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{
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fs.Close();
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fs.Dispose();
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if (File.Exists(m_TempFilePath))
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{
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File.Delete(m_TempFilePath);
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}
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Dispose();
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}
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public override void Dispose()
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{
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OnFinish = null;
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OnProgress = null;
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base.Dispose();
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}
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}
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