public IEnumerator Get(string url)
{
string[] txts = url.Split('?');
downloadFileName = txts[0].Substring(url.LastIndexOf('/') + 1);
downloadFilePath = downloadSaveDir + "/" + downloadFileName;
string tempFilePath = downloadFilePath + ".tmp";
curlength = FileUtil.GetFileLength(tempFilePath);
isError = false;
using (UnityWebRequest headRequest = UnityWebRequest.Head(url))
{
yield return(headRequest.SendWebRequest());
if (headRequest.isHttpError || headRequest.isNetworkError)
{
Debug.LogError("下载文件：" + downloadFileName + " " + headRequest.error);
onDownloadError?.Invoke();
isError = true;
yield break;
}
string contentLength = headRequest.GetResponseHeader("Content-Length");
if (!string.IsNullOrEmpty(contentLength))
{
totalLength = long.Parse(contentLength);
}
else
{
Debug.LogError("无法获取资源大小");
onDownloadError?.Invoke();
isError = true;
yield break;
}
}
Debug.Log("开始下载:" + downloadFileName + " 大小:" + UnitConvert.ByteConvert(totalLength) + " 已下载:" + UnitConvert.ByteConvert(curlength));
using (UnityWebRequest request = UnityWebRequest.Get(url))
{
request.SetRequestHeader("Range", "bytes=" + curlength + "-");
request.SendWebRequest();
using (FileStream fileStream = new FileStream(tempFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
fileStream.Seek(curlength, SeekOrigin.Begin);
int index = 0;
while (!request.isDone)
{
yield return(null);
byte[] data = request.downloadHandler.data;
int writeLength = data.Length - index;
fileStream.Write(data, index, writeLength);
index = data.Length;
curlength += writeLength;
downloadProgress = curlength * 1.0f / totalLength;
time += Time.deltaTime;
unitTotalLength += writeLength;
if (time > 1f)
{
downloadSpeed = unitTotalLength / 1024;
time = 0;
unitTotalLength = 0;
}
}
if (request.isHttpError || request.isNetworkError)
{
Debug.LogError(request.error);
onDownloadError?.Invoke();
isError = true;
yield break;
}
}
if (File.Exists(downloadFilePath))
{
File.Delete(downloadFilePath);
}
File.Move(tempFilePath, downloadFilePath);
Debug.Log("下载成功:" + downloadFileName);
isCompleted = true;
onDownloadCompleted?.Invoke();
}
}