// Download file bytes from the HTTP response stream
private void DownloadFile()
{
HttpWebRequest webRequest = null;
HttpWebResponse webResponse = null;
Stream responseStream = null;
ThrottledStream throttledStream = null;
MemoryStream downloadCache = null;
speedUpdateCount = 0;
recentAverageRate = 0;
if (downloadRates.Count > 0)
{
downloadRates.Clear();
}
try
{
if (this.IsBatch && !this.BatchUrlChecked)
{
CheckBatchUrl();
if (this.HasError)
{
this.RaiseDownloadCompleted();
return;
}
this.BatchUrlChecked = true;
}
if (!TempFileCreated)
{
// Reserve local disk space for the file
CreateTempFile();
this.TempFileCreated = true;
}
this.lastStartTime = DateTime.UtcNow;
if (this.Status == DownloadStatus.Waiting)
{
this.Status = DownloadStatus.Downloading;
}
// Create request to the server to download the file
webRequest = (HttpWebRequest)WebRequest.Create(this.Url);
webRequest.Method = "GET";
if (this.ServerLogin != null)
{
webRequest.PreAuthenticate = true;
webRequest.Credentials = this.ServerLogin;
}
else
{
webRequest.Credentials = CredentialCache.DefaultCredentials;
}
if (this.Proxy != null)
{
webRequest.Proxy = this.Proxy;
}
else
{
webRequest.Proxy = WebRequest.DefaultWebProxy;
}
// Set download starting point
webRequest.AddRange(DownloadedSize);
// Get response from the server and the response stream
webResponse = (HttpWebResponse)webRequest.GetResponse();
responseStream = webResponse.GetResponseStream();
// Set a 5 second timeout, in case of internet connection break
responseStream.ReadTimeout = 5000;
// Set speed limit
long maxBytesPerSecond = 0;
if (Settings.Default.EnableSpeedLimit)
{
maxBytesPerSecond = (long)((Settings.Default.SpeedLimit * 1024) / DownloadManager.Instance.ActiveDownloads);
}
else
{
maxBytesPerSecond = ThrottledStream.Infinite;
}
throttledStream = new ThrottledStream(responseStream, maxBytesPerSecond);
// Create memory cache with the specified size
downloadCache = new MemoryStream(this.MaxCacheSize);
// Create 1KB buffer
byte[] downloadBuffer = new byte[this.BufferSize];
int bytesSize = 0;
CachedSize = 0;
int receivedBufferCount = 0;
// Download file bytes until the download is paused or completed
while (true)
{
if (SpeedLimitChanged)
{
if (Settings.Default.EnableSpeedLimit)
{
maxBytesPerSecond = (long)((Settings.Default.SpeedLimit * 1024) / DownloadManager.Instance.ActiveDownloads);
}
else
{
maxBytesPerSecond = ThrottledStream.Infinite;
}
throttledStream.MaximumBytesPerSecond = maxBytesPerSecond;
SpeedLimitChanged = false;
}
// Read data from the response stream and write it to the buffer
bytesSize = throttledStream.Read(downloadBuffer, 0, downloadBuffer.Length);
// If the cache is full or the download is paused or completed, write data from the cache to the temporary file
if (this.Status != DownloadStatus.Downloading || bytesSize == 0 || this.MaxCacheSize < CachedSize + bytesSize)
{
// Write data from the cache to the temporary file
WriteCacheToFile(downloadCache, CachedSize);
this.DownloadedSize += CachedSize;
// Reset the cache
downloadCache.Seek(0, SeekOrigin.Begin);
CachedSize = 0;
// Stop downloading the file if the download is paused or completed
if (this.Status != DownloadStatus.Downloading || bytesSize == 0)
{
break;
}
}
// Write data from the buffer to the cache
downloadCache.Write(downloadBuffer, 0, bytesSize);
CachedSize += bytesSize;
receivedBufferCount++;
if (receivedBufferCount == this.BufferCountPerNotification)
{
this.RaiseDownloadProgressChanged();
receivedBufferCount = 0;
}
}
// Update elapsed time when the download is paused or completed
ElapsedTime = ElapsedTime.Add(DateTime.UtcNow - lastStartTime);
// Change status
if (this.Status != DownloadStatus.Deleting)
{
if (this.Status == DownloadStatus.Pausing)
{
this.Status = DownloadStatus.Paused;
UpdateDownloadDisplay();
}
else if (this.Status == DownloadStatus.Queued)
{
UpdateDownloadDisplay();
}
else
{
this.CompletedOn = DateTime.UtcNow;
this.RaiseDownloadCompleted();
}
}
}
catch (Exception ex)
{
// Show error in the status
this.StatusString = "Ошибка: " + ex.Message;
this.HasError = true;
this.RaiseDownloadCompleted();
}
finally
{
// Close the response stream and cache, stop the thread
if (responseStream != null)
{
responseStream.Close();
}
if (throttledStream != null)
{
throttledStream.Close();
}
if (webResponse != null)
{
webResponse.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
if (DownloadThread != null)
{
DownloadThread.Abort();
}
}
}
// Download file bytes from the HTTP response stream
private void DownloadFile()
{
HttpWebRequest webRequest = null;
HttpWebResponse webResponse = null;
Stream responseStream = null;
ThrottledStream throttledStream = null;
MemoryStream downloadCache = null;
speedUpdateCount = 0;
recentAverageRate = 0;
if (downloadRates.Count > 0)
downloadRates.Clear();
try
{
if (this.IsBatch && !this.BatchUrlChecked)
{
CheckBatchUrl();
if (this.HasError)
{
this.RaiseDownloadCompleted();
return;
}
this.BatchUrlChecked = true;
}
if (!TempFileCreated)
{
// Reserve local disk space for the file
CreateTempFile();
this.TempFileCreated = true;
}
this.lastStartTime = DateTime.UtcNow;
if (this.Status == DownloadStatus.Waiting)
this.Status = DownloadStatus.Downloading;
// Create request to the server to download the file
webRequest = (HttpWebRequest)WebRequest.Create(this.Url);
webRequest.Method = "GET";
if (this.ServerLogin != null)
{
webRequest.PreAuthenticate = true;
webRequest.Credentials = this.ServerLogin;
}
else
{
webRequest.Credentials = CredentialCache.DefaultCredentials;
}
if (this.Proxy != null)
{
webRequest.Proxy = this.Proxy;
}
else
{
webRequest.Proxy = WebRequest.DefaultWebProxy;
}
// Set download starting point
webRequest.AddRange(DownloadedSize);
// Get response from the server and the response stream
webResponse = (HttpWebResponse)webRequest.GetResponse();
responseStream = webResponse.GetResponseStream();
// Set a 5 second timeout, in case of internet connection break
responseStream.ReadTimeout = 5000;
// Set speed limit
long maxBytesPerSecond = 0;
if (Settings.Default.EnableSpeedLimit)
{
maxBytesPerSecond = (long)((Settings.Default.SpeedLimit * 1024) / DownloadManager.Instance.ActiveDownloads);
}
else
{
maxBytesPerSecond = ThrottledStream.Infinite;
}
throttledStream = new ThrottledStream(responseStream, maxBytesPerSecond);
// Create memory cache with the specified size
downloadCache = new MemoryStream(this.MaxCacheSize);
// Create 1KB buffer
byte[] downloadBuffer = new byte[this.BufferSize];
int bytesSize = 0;
CachedSize = 0;
int receivedBufferCount = 0;
// Download file bytes until the download is paused or completed
while (true)
{
if (SpeedLimitChanged)
{
if (Settings.Default.EnableSpeedLimit)
{
maxBytesPerSecond = (long)((Settings.Default.SpeedLimit * 1024) / DownloadManager.Instance.ActiveDownloads);
}
else
{
maxBytesPerSecond = ThrottledStream.Infinite;
}
throttledStream.MaximumBytesPerSecond = maxBytesPerSecond;
SpeedLimitChanged = false;
}
// Read data from the response stream and write it to the buffer
bytesSize = throttledStream.Read(downloadBuffer, 0, downloadBuffer.Length);
// If the cache is full or the download is paused or completed, write data from the cache to the temporary file
if (this.Status != DownloadStatus.Downloading || bytesSize == 0 || this.MaxCacheSize < CachedSize + bytesSize)
{
// Write data from the cache to the temporary file
WriteCacheToFile(downloadCache, CachedSize);
this.DownloadedSize += CachedSize;
// Reset the cache
downloadCache.Seek(0, SeekOrigin.Begin);
CachedSize = 0;
// Stop downloading the file if the download is paused or completed
if (this.Status != DownloadStatus.Downloading || bytesSize == 0)
{
break;
}
}
// Write data from the buffer to the cache
downloadCache.Write(downloadBuffer, 0, bytesSize);
CachedSize += bytesSize;
receivedBufferCount++;
if (receivedBufferCount == this.BufferCountPerNotification)
{
this.RaiseDownloadProgressChanged();
receivedBufferCount = 0;
}
}
// Update elapsed time when the download is paused or completed
ElapsedTime = ElapsedTime.Add(DateTime.UtcNow - lastStartTime);
// Change status
if (this.Status != DownloadStatus.Deleting)
{
if (this.Status == DownloadStatus.Pausing)
{
this.Status = DownloadStatus.Paused;
UpdateDownloadDisplay();
}
else if (this.Status == DownloadStatus.Queued)
{
UpdateDownloadDisplay();
}
else
{
this.CompletedOn = DateTime.UtcNow;
this.RaiseDownloadCompleted();
}
}
}
catch (Exception ex)
{
// Show error in the status
this.StatusString = "Error: " + ex.Message;
this.HasError = true;
this.RaiseDownloadCompleted();
}
finally
{
// Close the response stream and cache, stop the thread
if (responseStream != null)
{
responseStream.Close();
}
if (throttledStream != null)
{
throttledStream.Close();
}
if (webResponse != null)
{
webResponse.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
if (DownloadThread != null)
{
DownloadThread.Abort();
}
}
}
