class Downloader
{
/// <summary>
/// 下载一个文件块,利用该方法可自行实现多线程断点续传
/// </summary>
/// <param name="Address">URL 地址</param>
/// <param name="FileName">保存到本地的路径文件名</param>
/// <param name="Length">块大小</param>
public void DownloadFileChunk(string Address, string FileName, int FromPosition, int Length)
{
HttpWebResponse hwrp = null;
string a = null;
try
{
//this._FileName = FileName;
HttpWebRequest hwrq = (HttpWebRequest)WebRequest.Create(Address);
//hwrq.Credentials = this.m_credentials;
hwrq.AddRange(FromPosition);
hwrp = (HttpWebResponse)hwrq.GetResponse();
a = hwrp.Headers["Content-Disposition"]; //attachment
if (a != null)
{
a = a.Substring(a.LastIndexOf("filename=") + 9);
}
else
{
a = FileName;
}
byte[] buffer = this.ResponseAsBytes(Address, hwrp, Length, FileName);
}
catch (Exception e)
{
//add you code.
}
}
internal byte[] ResponseAsBytes(string RequestURL, WebResponse Response, long Length, string FileName)
{
byte[] buffers = new byte[Length];
string s = Response.Headers["Content-Range"];
//add your code.
Stream S = Response.GetResponseStream();
//add your code.
S.Close();
Response.Close();
return buffers;
}
}