byte[] ReadBuffer = new byte[1024 * 128 * 1]; // кеш - 0.5 Мб
void DownloadFileStreamly(Stream dataStream)
{
DownloadProgress CurrentDownloadProgress = new DownloadProgress();
Stream WriteStream = null;
Exception TempEx = null;
try
{
if (Current.DownloadPathSave != null)
{
string FilePath = Current.DownloadPathSave + "\\" + Current.Filename;
if (System.IO.File.Exists(FilePath))
{
System.IO.FileInfo xx = new System.IO.FileInfo(FilePath);
if (xx.Length > Current.FileSize)
{
xx.Delete();
Current.BytesDownloaded = 0;
}
}
else
{
Current.BytesDownloaded = 0;
}
WriteStream = new FileStream(FilePath, FileMode.OpenOrCreate);
CurrentDownloadProgress.FilePath = FilePath;
}
else
{
WriteStream = Current.OutputData;
}
if (Current.FileSize == Current.BytesDownloaded && Current.BytesDownloaded != 0 &&
Current.FileDownloaded)
{
throw new Exception("Файл уже закачан " + Current.FullURL);
}
if (Current.FileSize > 0 && Current.BytesDownloaded == 0 &&
WriteStream.Length != Current.FileSize)
{ // если известен размер файла и файл только что добавили, то создаем пустышку в размер файла
WriteStream.SetLength(Current.FileSize);
}
if (WriteStream.Length == Current.BytesDownloaded && WriteStream.Length != 0)
{
Current.BytesDownloaded = 0;
}
WriteStream.Position = Current.BytesDownloaded;
DateTime BeginTime = DateTime.Now;
TimeSpan TimeDifference;
TimeSpan RemainTime;
int BeginDownloadBytes = Current.BytesDownloaded;
int ReadData = 1;
int BufferOffset = 0;
double LastTimeDifferenceSeconds = 0;
while (DownloadFileThreadRunning)
{
if (!DownloadFileThreadPause)
{ // если не была задана пауза
ReadData = dataStream.Read(ReadBuffer, BufferOffset, ReadBuffer.Length - BufferOffset);
BufferOffset += ReadData;
TimeDifference = DateTime.Now - BeginTime;
if (((ReadBuffer.Length - BufferOffset) < 1024) || // осталось черезчур мало места в буффере
(ReadData == 0) || // закачка закончилась
(TimeDifference.TotalSeconds != LastTimeDifferenceSeconds)) // но не реже 1 раза в секунду
{
WriteStream.Write(ReadBuffer, 0, BufferOffset);
Current.BytesDownloaded += BufferOffset;
if (TimeDifference.TotalSeconds != LastTimeDifferenceSeconds)
{
CurrentDownloadProgress.DownloadSize = Math.Max(Current.BytesDownloaded, Current.FileSize);
CurrentDownloadProgress.Bytes = Current.BytesDownloaded;
CurrentDownloadProgress.Speed = (
(Current.BytesDownloaded - BeginDownloadBytes) * 1000.0f
/ (float)TimeDifference.TotalMilliseconds);
RemainTime = new TimeSpan((long)
((TimeDifference.Ticks * (Current.FileSize - Current.BytesDownloaded))
/ (float)(Current.BytesDownloaded - BeginDownloadBytes))
);
CurrentDownloadProgress.RemainTime = RemainTime.ToString();
CurrentDownloadProgress.Type = DownloadMessageType.DownloadProgressShow;
SygnalEventProgress(CurrentDownloadProgress);
if (TimeDifference.TotalSeconds >= 5)
{
BeginTime = DateTime.Now;
BeginDownloadBytes = Current.BytesDownloaded;
}
}
;
BufferOffset = 0;
LastTimeDifferenceSeconds = TimeDifference.TotalSeconds;
}
}
else
{// была задана пауза
CurrentDownloadProgress.Type = DownloadMessageType.DownloadPaused;
SygnalEventProgress(CurrentDownloadProgress);
Thread.Sleep(500);
}
if (ReadData == 0)
{ // все закачали
if (Current.FileSize == -1)
{ // не был известен размер файла
Current.FileSize = Current.BytesDownloaded;
}
break;
}
}
}
catch (Exception ex)
{
TempEx = ex;
// ErrorWork(new Exception("Размер файла " + Current.FileSize));
}
finally
{
WriteStream.Close();
// финальное состояние
CurrentDownloadProgress.DownloadSize = Math.Max(Current.BytesDownloaded, Current.FileSize);
CurrentDownloadProgress.Bytes = Current.BytesDownloaded;
CurrentDownloadProgress.Type = DownloadMessageType.DownloadProgressShow;
SygnalEventProgress(CurrentDownloadProgress);
if (DownloadFileThreadRunning && Current.FileSize == Current.BytesDownloaded)
{ // файл закончен
CurrentDownloadProgress.Type = DownloadMessageType.DownloadFinished;
SygnalEventProgress(CurrentDownloadProgress);
Current.FileDownloaded = true;
}
else
{ // была нажата кнопка стоп -поэтому - ничего не вызываем
CurrentDownloadProgress.Type = DownloadMessageType.DownloadStopped;
CurrentDownloadProgress.AdditionalInfo = "DownloadFileThreadRunning " + DownloadFileThreadRunning.ToString() +
" Current.FileSize = " + Current.FileSize.ToString() +
" Current.BytesDownloaded = " + Current.BytesDownloaded.ToString();
SygnalEventProgress(CurrentDownloadProgress);
}
DownloadFileThreadRunning = false;
}
if (TempEx != null)
{
throw TempEx;
}
}
