// Begin downloading the file at the specified url, and save it to the given folder.
void BeginDownload()
{
DownloadData data = null;
FileStream fs = null;
try
{
//start the stopwatch for speed calc
sw.Start();
// get download details
waitingForResponse = true;
data = DownloadData.Create(url, destFolder);
waitingForResponse = false;
//reset the adler
downloadedAdler32.Reset();
DownloadingTo = data.Filename;
if (!File.Exists(DownloadingTo))
{
// create the file
fs = File.Open(DownloadingTo, FileMode.Create, FileAccess.Write);
}
else
{
// read in the existing data to calculate the adler32
if (Adler32 != 0)
{
GetAdler32(DownloadingTo);
}
// apend to an existing file (resume)
fs = File.Open(DownloadingTo, FileMode.Append, FileAccess.Write);
}
// create the download buffer
byte[] buffer = new byte[BufferSize];
int readCount;
// update how many bytes have already been read
sentSinceLastCalc = data.StartPoint; //for BPS calculation
while ((readCount = data.DownloadStream.Read(buffer, 0, BufferSize)) > 0)
{
// break on cancel
if (bw.CancellationPending)
{
data.Close();
fs.Close();
break;
}
// update total bytes read
data.StartPoint += readCount;
// update the adler32 value
if (Adler32 != 0)
{
downloadedAdler32.Update(buffer, 0, readCount);
}
// save block to end of file
fs.Write(buffer, 0, readCount);
//calculate download speed
calculateBps(data.StartPoint, data.TotalDownloadSize);
// send progress info
if (!bw.CancellationPending)
{
bw.ReportProgress(0, new object[] {
//use the realtive progress or the raw progress
UseRelativeProgress?
InstallUpdate.GetRelativeProgess(0, data.PercentDone) :
data.PercentDone,
// unweighted percent
data.PercentDone,
downloadSpeed, ProgressStatus.None, null
});
}
// break on cancel
if (bw.CancellationPending)
{
data.Close();
fs.Close();
break;
}
}
}
catch (UriFormatException e)
{
throw new Exception(string.Format("Could not parse the URL \"{0}\" - it's either malformed or is an unknown protocol.", url), e);
}
catch (Exception e)
{
if (string.IsNullOrEmpty(DownloadingTo))
{
throw new Exception(string.Format("Error trying to save file: {0}", e.Message), e);
}
else
{
throw new Exception(string.Format("Error trying to save file \"{0}\": {1}", DownloadingTo, e.Message), e);
}
}
finally
{
if (data != null)
{
data.Close();
}
if (fs != null)
{
fs.Close();
}
}
}
private void BeginDownload()
{
DownloadData downloadData = null;
FileStream fileStream = null;
try
{
sw.Start();
waitingForResponse = true;
downloadData = DownloadData.Create(url, destFolder);
waitingForResponse = false;
downloadedAdler32.Reset();
DownloadingTo = downloadData.Filename;
if (!File.Exists(DownloadingTo))
{
fileStream = File.Open(DownloadingTo, FileMode.Create, FileAccess.Write);
}
else
{
if (Adler32 != 0)
{
GetAdler32(DownloadingTo);
}
fileStream = File.Open(DownloadingTo, FileMode.Append, FileAccess.Write);
}
byte[] buffer = new byte[4096];
sentSinceLastCalc = downloadData.StartPoint;
do
{
int num;
if ((num = downloadData.DownloadStream.Read(buffer, 0, 4096)) <= 0)
{
return;
}
if (bw.CancellationPending)
{
downloadData.Close();
fileStream.Close();
return;
}
downloadData.StartPoint += num;
if (Adler32 != 0)
{
downloadedAdler32.Update(buffer, 0, num);
}
fileStream.Write(buffer, 0, num);
calculateBps(downloadData.StartPoint, downloadData.TotalDownloadSize);
if (!bw.CancellationPending)
{
bw.ReportProgress(0, new object[5]
{
UseRelativeProgress?InstallUpdate.GetRelativeProgess(0, downloadData.PercentDone) : downloadData.PercentDone,
downloadData.PercentDone,
downloadSpeed,
ProgressStatus.None,
null
});
}
}while (!bw.CancellationPending);
downloadData.Close();
fileStream.Close();
}
catch (UriFormatException innerException)
{
throw new Exception($"Could not parse the URL \"{url}\" - it's either malformed or is an unknown protocol.", innerException);
}
catch (Exception ex)
{
if (string.IsNullOrEmpty(DownloadingTo))
{
throw new Exception($"Error trying to save file: {ex.Message}", ex);
}
throw new Exception($"Error trying to save file \"{DownloadingTo}\": {ex.Message}", ex);
}
finally
{
downloadData?.Close();
fileStream?.Close();
}
}