/// <summary>
/// 下载完成
/// </summary>
private void DownloadFileOk(string localfileReal, string localfileWithSuffix)
{
try
{
//去掉.downloading后缀
FileInfo fi = new FileInfo(localfileWithSuffix);
fi.MoveTo(localfileReal);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
//通知完成
ShowDownloadPercent?.Invoke(100);
}
}
/// <summary>
/// Http方式下载文件
/// </summary>
/// <param name="url">http地址</param>
/// <param name="localfile">本地文件</param>
/// <returns>错误码</returns>
public int DownloadFile(string url, string localfile)
{
int ret = 0;
string localfileReal = localfile;
string localfileWithSuffix = localfileReal + Suffix;
try
{
long startPosition = 0;
FileStream writeStream = null;
if (string.IsNullOrEmpty(url) || string.IsNullOrEmpty(localfileReal))
{
return(1);
}
//取得远程文件长度
long remoteFileLength = GetHttpLength(url);
if (remoteFileLength == 0)
{
return(2);
}
if (File.Exists(localfileReal))
{
return(0);
}
//判断要下载的文件是否存在
if (File.Exists(localfileWithSuffix))
{
writeStream = File.OpenWrite(localfileWithSuffix);
startPosition = writeStream.Length;
if (startPosition > remoteFileLength)
{
writeStream.Close();
File.Delete(localfileWithSuffix);
writeStream = new FileStream(localfileWithSuffix, FileMode.Create);
}
else if (startPosition == remoteFileLength)
{
DownloadFileOk(localfileReal, localfileWithSuffix);
writeStream.Close();
return(0);
}
else
{
writeStream.Seek(startPosition, SeekOrigin.Begin);
}
}
else
{
writeStream = new FileStream(localfileWithSuffix, FileMode.Create);
}
HttpWebRequest req = null;
HttpWebResponse rsp = null;
try
{
req = (HttpWebRequest)HttpWebRequest.Create(url);
if (startPosition > 0)
{
req.AddRange((int)startPosition);
}
rsp = (HttpWebResponse)req.GetResponse();
using (Stream readStream = rsp.GetResponseStream())
{
byte[] btArray = new byte[ByteSize];
long currPostion = startPosition;
int contentSize = 0;
while ((contentSize = readStream.Read(btArray, 0, btArray.Length)) > 0)
{
writeStream.Write(btArray, 0, contentSize);
currPostion += contentSize;
ShowDownloadPercent?.Invoke((int)(currPostion * 100 / remoteFileLength));
}
}
}
catch (Exception ex)
{
Console.WriteLine("获取远程文件失败！exception：\n" + ex.ToString());
ret = 3;
}
finally
{
if (writeStream != null)
{
writeStream.Close();
}
if (rsp != null)
{
rsp.Close();
}
if (req != null)
{
req.Abort();
}
if (ret == 0)
{
DownloadFileOk(localfileReal, localfileWithSuffix);
}
}
}
catch (Exception ex)
{
Console.WriteLine("获取远程文件失败！exception：\n" + ex.ToString());
ret = 4;
}
return(ret);
}
