/// <summary>
/// Event für das Ende des Datei-Downloads auslösen
/// </summary>
protected virtual void OnFileDownloadFinished()
{
FileDownloadFinished?.Invoke(this, new EventArgs());
}
/// <summary>
/// Downloads a file.
/// </summary>
/// <param name="name">The name of the file.</param>
/// <param name="bytesReadDelegate">A <see cref="FileDownloadBytesReadDelegate"/> which is called everytime an array of bytes has been read from the server. /></param>
/// <param name="downloadFinished">A <see cref="FileDownloadFinished"/> which is called after the entire download has been completed.</param>
/// <param name="taskCanceled">A <see cref="IOTaskIsCanceledDelegate"/> which is called before each reading cycle to cancel the download.</param>
/// <param name="binaryMode">Indicates whether the file should be downloaded in binary or text mode.</param>
public async void BeginDownloadFile(string name, FileDownloadBytesReadDelegate bytesReadDelegate, FileDownloadFinished downloadFinished, IOTaskIsCanceledDelegate taskCanceled, bool binaryMode = false)
{
IsIdled = false;
checkConnected();
if (binaryMode)
{
EnterBinaryMode();
}
if (_dataChannelSocket == null)
{
if (EnterPassiveModeAutomatic)
{
await EnterPassiveMode();
}
}
string answer;
if (!TrySendCommandReadAnswer("RETR " + name, out answer))
{
return;
}
if (answer == null)
{
return;
}
if (answer.Trim().StartsWith("425"))
{
_dataChannelSocket = null;
if (EnterPassiveModeAutomatic)
{
await EnterPassiveMode();
if (!TrySendCommandReadAnswer("RETR " + name, out answer))
{
return;
}
if (answer == null)
{
return;
}
}
}
if (answer.Trim().StartsWith("150") | answer.Trim().StartsWith("125"))
{
beginDownloadData(bytesReadDelegate, new FileDownloadFinished((ulong readbytes) =>
{
EnterASCIIMode();
IsIdled = true;
downloadFinished(readbytes);
}), taskCanceled);
}
}
/// <summary>
/// Internal method to download the content of the download's client connection.
/// </summary>
/// <param name="bytesReadDelegate">A <see cref="FileDownloadBytesReadDelegate"/> which is called everytime an array of bytes has been read from the server. /></param>
/// <param name="downloadFinished">A <see cref="FileDownloadFinished"/> which is called after the entire download has been completed.</param>
/// <param name="taskCanceled">A <see cref="IOTaskIsCanceledDelegate"/> which is called before each reading cycle to cancel the download.</param>>
private void beginDownloadData(FileDownloadBytesReadDelegate bytesReadDelegate, FileDownloadFinished downloadFinished, IOTaskIsCanceledDelegate taskCanceled)
{
ulong totalReadBytes = 0;
int readbytes = 1;
byte[] buffer = new byte[10240];
while (readbytes > 0)
{
if (taskCanceled())
{
break;
}
try
{
readbytes = _dataChannelSocketReader.Read(buffer, 0, 1024);
}
catch (Exception) { break; }
finally
{
totalReadBytes += (ulong)readbytes;
bytesReadDelegate(readbytes, totalReadBytes, buffer);
}
}
_dataChannelSocket.Dispose();
_dataChannelSocket = null;
string answer = string.Empty;
try
{
answer = ReadAnswer(ClientType.ActiveClient);
}
catch (IOException) { throw; }
downloadFinished(totalReadBytes);
}
public async void BeginDownloadFile(string absoluteFileName, FileDownloadBytesReadDelegate bytesReadDelegate, FileDownloadFinished downloadFinished, IOTaskIsCanceledDelegate taskCanceled, bool binaryMode = false)
{
(await getIdledConnection()).BeginDownloadFile(absoluteFileName, bytesReadDelegate, downloadFinished, taskCanceled, binaryMode);
}
