void DownloadNextFile()
{
//Debug.Log(downloadFileIndex + " : " + totalFileCount);
//下载完成
if (downloadFileIndex >= totalFileCount)
{
FinishDownloadFile();
return;
}
//更新进度
if (downloadUpdate != null)
{
downloadUpdate(downloadFileIndex + 1, totalFileCount);
}
Debug.Log(downloadList[downloadFileIndex]);
string bundleName = downloadList[downloadFileIndex];
string bundleFullName = remoteResourceData.GetBundleFullNameByBundleName(bundleName);
//先使用中间文件
string localFilePath = PathTools.DataPath + bundleFullName + ".temp";
string remoteFilePath = UpdateConfig.Instance.serverUrl + bundleFullName;
Debug.Log(remoteFilePath);
float progress = 0f;
//开启子线程下载,使用匿名方法
Loom.RunAsync(() =>
{
//使用流操作文件
FileStream fs = new FileStream(localFilePath, FileMode.OpenOrCreate, FileAccess.Write);
//获取文件现在的长度
long fileLength = fs.Length;
//获取下载文件的总长度
long totalLength = remoteResourceData.GetSizeByBundleName(bundleName);
//如果没下载完
if (fileLength < totalLength)
{
//断点续传核心，设置本地文件流的起始位置
fs.Seek(fileLength, SeekOrigin.Begin);
HttpWebRequest request = HttpWebRequest.Create(remoteFilePath) as HttpWebRequest;
//断点续传核心，设置远程访问文件流的起始位置
request.AddRange((int)fileLength);
Stream stream = request.GetResponse().GetResponseStream();
byte[] buffer = new byte[1024];
//使用流读取内容到buffer中
//注意方法返回值代表读取的实际长度,并不是buffer有多大，stream就会读进去多少
int length = stream.Read(buffer, 0, buffer.Length);
while (length > 0)
{
//将内容再写入本地文件中
fs.Write(buffer, 0, length);
//计算进度
fileLength += length;
progress = (float)fileLength / (float)totalLength;
//类似尾递归
length = stream.Read(buffer, 0, buffer.Length);
//更新下载大小
Loom.QueueOnMainThread(() =>
{
if (sizeUpdate != null)
{
sizeUpdate(finishFileSize + fileLength, totalFileSize);
}
});
}
stream.Close();
stream.Dispose();
fs.Close();
}
else
{
progress = 1;
}
//如果下载完毕，执行回调
if (progress == 1)
{
Debug.Log(bundleName + " Download finished!");
Loom.QueueOnMainThread(() =>
{
finishFileSize += remoteResourceData.GetSizeByBundleName(bundleName);
++downloadFileIndex;
DownloadNextFile();
});
}
else
{
//多次重试 失败后 直接开始游戏
if (downloadRetryCount > 4)
{
Loom.QueueOnMainThread(() =>
{
EndUpdateResource();
});
return;
}
//下载出错了 再次下载
Loom.QueueOnMainThread(() =>
{
++downloadRetryCount;
DownloadNextFile();
});
return;
}
});
}