private int GetWebFileSize(string url)
{
HttpWebRequest request = null;
WebResponse respone = null;
int length = 0;
try
{
request = WebRequest.Create(url) as HttpWebRequest;
request.Timeout = TimeOutWait;
request.ReadWriteTimeout = ReadWriteTimeOut;
//向服务器请求，获得服务器回应数据流
respone = request.GetResponse();
length = (int)respone.ContentLength;
}
catch (WebException e)
{
Debug.Log("获取文件长度出错：" + e.Message);
State = DownloadMacState.Error;
Error = "Request File Length Error " + e.Message;
}
finally
{
if (respone != null)
{
respone.Close(); respone = null;
}
if (request != null)
{
request.Abort(); request = null;
}
}
return(length);
}
public void Run()
{
TryCount++;
State = DownloadMacState.ResetSize;
if (!ResetSize())
{
return;
}
State = DownloadMacState.Download;
if (!DownLoad())
{
return;
}
State = DownloadMacState.Md5;
if (!CheckMd5()) // 校验失败，重下一次
{
State = DownloadMacState.Download;
if (!DownLoad())
{
return;
}
State = DownloadMacState.Md5;
if (!CheckMd5())
{
return; // 两次都失败，文件有问题
}
}
State = DownloadMacState.Complete;
}
private bool CheckMd5()
{
if (string.IsNullOrEmpty(DownUnit.Md5))
{
return(true); //不做校验，默认成功
}
string md5 = MD5Helper.GetMD5HashFromFile(DownUnit.SavePath);
if (md5 != DownUnit.Md5)
{
File.Delete(DownUnit.SavePath);
//ThreadDebugLog.Log("文件MD5校验出错：" + Unit.name);
State = DownloadMacState.Error;
Error = "Check MD5 Error ";
return(false);
}
return(true);
}
private bool DownLoad()
{
// 打开上次下载的文件
long startPos = 0;
var tempFile = DownUnit.SavePath + ".temp";
FileStream fs = null;
if (File.Exists(DownUnit.SavePath)) // 文件已存在，跳过
{
CurSize = DownUnit.Size;
return(true);
}
else if (File.Exists(tempFile)) // 以及有部分下载到本地
{
fs = File.OpenWrite(tempFile);
startPos = fs.Length;
fs.Seek(startPos, SeekOrigin.Current); // 移动文件流中的当前指针
if (startPos == DownUnit.Size) // 文件已经下载完，没改名字，结束
{
fs.Flush();
fs.Close();
fs = null;
SaveTempFile(fs, tempFile);
CurSize = (int)startPos;
return(true);
}
}
else
{
var direName = Path.GetDirectoryName(tempFile);
if (!Directory.Exists(direName))
{
Directory.CreateDirectory(direName);
}
fs = new FileStream(tempFile, FileMode.Create);
}
// 下载逻辑
HttpWebRequest request = null;
HttpWebResponse respone = null;
Stream ns = null;
try
{
request = WebRequest.Create(DownUnit.DownUrl) as HttpWebRequest;
request.ReadWriteTimeout = ReadWriteTimeOut;
request.Timeout = TimeOutWait;
// 断点续传
if (startPos > 0)
{
request.AddRange((int)startPos); // 设置Range值，断点续传
}
respone = (HttpWebResponse)request.GetResponse();
ns = respone.GetResponseStream();
ns.ReadTimeout = TimeOutWait;
var totalSize = respone.ContentLength;
var curSize = startPos;
if (curSize == totalSize)
{
fs.Flush();
fs.Close();
fs = null;
SaveTempFile(fs, tempFile);
CurSize = (int)startPos;
}
else
{
var bytes = new byte[OneReadLen];
var readSize = ns.Read(bytes, 0, OneReadLen); // 读取第一份数据
while (readSize > 0)
{
fs.Write(bytes, 0, readSize); // 将下载到的数据写入临时文件
curSize += readSize;
// 判断是否下载完成
// 下载完成将temp文件，改成正式文件
if (curSize == totalSize)
{
fs.Flush();
fs.Close();
fs = null;
SaveTempFile(fs, tempFile);
}
// 回调一下
CurSize = (int)curSize;
// 往下继续读取
readSize = ns.Read(bytes, 0, OneReadLen);
}
}
}
catch (Exception ex)
{
//下载失败，删除临时文件
if (fs != null)
{
fs.Flush(); fs.Close(); fs = null;
}
if (File.Exists(tempFile))
{
File.Delete(tempFile);
}
if (File.Exists(DownUnit.SavePath))
{
File.Delete(DownUnit.SavePath);
}
State = DownloadMacState.Error;
Error = string.Format("Download Error : {0}", ex.Message);
Debug.LogError(Error);
}
finally
{
if (fs != null)
{
fs.Flush(); fs.Close(); fs = null;
}
if (ns != null)
{
ns.Close(); ns = null;
}
if (respone != null)
{
respone.Close(); respone = null;
}
if (request != null)
{
request.Abort(); request = null;
}
}
if (State == DownloadMacState.Error)
{
return(false);
}
return(true);
}
