public static int OnWriteData(Byte[] buf, Int32 size, Int32 nmemb, Object extraData)
{
DownLoadParam param = (DownLoadParam)extraData;
FileDownloaderEx downloader = param.downloader;
DownloadDataEx data = param.downloadData;
if (downloader.canceled)
{
return(-1);
}
int readCount = size * nmemb;
param.totalDownloaded += readCount;
// save block to end of file
downloader.SaveToFile(buf, readCount, data.DownloadingToStream);
// send progress info
if (data.IsProgressKnown)
{
downloader.RaiseProgressChanged(param.totalDownloaded, data.FileSize);
}
if (downloader.canceled)
{
return(-1);
}
else
{
return(size * nmemb);
}
}
///// <summary>
///// Begin downloading the file at the specified url, and save it to the current fileName.
///// </summary>
//public void Download(string url)
//{
// Download(url, "");
//}
/// <summary>
/// Begin downloading the file at the specified url, and save it to the given fileName.
/// </summary>
public void Download(string url, string hostName, string destFileName, int timeout)
{
DownloadDataEx data = null;
this.canceled = false;
try
{
// get download details
data = DownloadDataEx.Create(url, hostName, destFileName, 2000);
//// Find out the name of the file that the web server gave us.
//string destFileName = Path.GetFileName(data.Response.ResponseUri.ToString());
DownLoadParam param = new DownLoadParam()
{
downloader = this,
downloadData = data,
totalDownloaded = data.StartPoint,
};
data.DoDownload(url, hostName, destFileName, timeout, downloadBlockSize, OnWriteData, param);
bool gotCanceled = false;
if (this.canceled)
{
gotCanceled = true;
}
// stream could be incomplete
if (data.IsProgressKnown)
{
if (param.totalDownloaded < data.FileSize)
{
throw new WebException("date transfer not completed", WebExceptionStatus.ConnectionClosed);
}
}
if (!gotCanceled)
{
RaiseProgressChanged(data.FileSize, data.FileSize);
data.CleanOnFinish();
OnDownloadComplete();
}
}
catch (UriFormatException e)
{
throw new ArgumentException(
String.Format("Could not parse the URL \"{0}\" - it's either malformed or is an unknown protocol.", url), e);
}
finally
{
if (data != null)
{
data.Close();
}
}
}
public static DownloadDataEx Create(string url, string hostname, string destFileName, int timeout)
{
String lastModified = "";
// This is what we will return
DownloadDataEx downloadData = new DownloadDataEx();
downloadData.downloadTo = destFileName;
long urlSize = downloadData.GetFileSize(url, hostname, timeout, ref lastModified);
downloadData.size = urlSize;
String downloadTo = destFileName;
FingerPrint fingerPrint = LoadFingerPrint(downloadTo);
// If we don't know how big the file is supposed to be,
// we can't resume, so delete what we already have if something is on disk already.
if (!downloadData.IsProgressKnown ||
lastModified == "" || fingerPrint.timeStamp != lastModified ||
fingerPrint.fileSize != urlSize)
{
DeleteDestFile(downloadTo);
}
SaveFingerPrint(downloadTo, new FingerPrint {
timeStamp = lastModified, fileSize = urlSize
});
if (downloadData.IsProgressKnown && File.Exists(downloadTo))
{
DeleteDestFile(downloadTo);
downloadData.start = 0;
}
downloadData.downloadToStream = File.Open(downloadTo, FileMode.CreateNew, FileAccess.Write);
return(downloadData);
}