帮我写一个unity下载文件,支持断点续传,支持下载百分比显示,支持下载速度显示
时间: 2024-01-11 10:02:27 浏览: 29
好的,以下是一个简单的Unity下载文件的示例,支持断点续传,支持下载百分比显示和下载速度显示:
```csharp
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
public class DownloadManager : MonoBehaviour
{
public string url;
public string savePath;
public bool showProgress;
public bool showSpeed;
private UnityWebRequest request;
private bool isDownloading;
private float downloadSpeed;
private long lastDownloadedSize;
private long totalDownloadedSize;
private void Start()
{
StartCoroutine(DownloadCoroutine());
}
private IEnumerator DownloadCoroutine()
{
if (File.Exists(savePath)) // 如果文件已经存在,检查是否支持断点续传
{
long existingFileSize = new FileInfo(savePath).Length;
request = UnityWebRequest.Get(url);
request.SetRequestHeader("Range", "bytes=" + existingFileSize + "-");
request.SendWebRequest();
}
else // 文件不存在,从头开始下载
{
request = UnityWebRequest.Get(url);
request.SendWebRequest();
}
isDownloading = true;
while (isDownloading)
{
if (request.isNetworkError || request.isHttpError)
{
Debug.Log(request.error);
isDownloading = false;
}
else
{
if (showProgress)
{
float progress = request.downloadProgress;
Debug.Log("Download progress: " + progress * 100 + "%");
}
totalDownloadedSize = (long)request.downloadedBytes; // 已经下载的总字节数
if (showSpeed)
{
downloadSpeed = (totalDownloadedSize - lastDownloadedSize) / Time.deltaTime; // 下载速度(字节/秒)
Debug.Log("Download speed: " + downloadSpeed / 1024 + "KB/s");
}
lastDownloadedSize = totalDownloadedSize;
if (request.isDone) // 下载完成
{
isDownloading = false;
if (showProgress)
{
Debug.Log("Download progress: 100%");
}
if (showSpeed)
{
downloadSpeed = 0;
}
byte[] data = request.downloadHandler.data;
File.WriteAllBytes(savePath, data); // 将下载的数据写入文件
}
}
yield return null;
}
}
}
```
使用时,将脚本挂在一个空物体上,设置好url和savePath即可。如果要显示下载进度和下载速度,将showProgress和showSpeed设置为true即可。