/// <summary>
/// Download a chunk of data
/// </summary>
/// <param name="logonId">Logon id of user</param>
/// <param name="TransferId">Transfer id</param>
/// <param name="StreamPosition">The start position of the data chunk</param>
/// <returns></returns>
public static FileChunkData DownloadChunk(Guid logonId, Guid TransferId, long StreamPosition)
{
FileTransferData FileTransferData = Host.GetFileTransferData(logonId);
if (!FileTransferData.IsDownload)
{
throw new Exception("File download has not been started");
}
if (FileTransferData.TransferId != TransferId)
{
throw new Exception("Transfer id does not match");
}
if (FileTransferData.FileStream == null)
{
throw new Exception("File download has not been started or has timed out");
}
if (FileTransferData.FileStream.Position != StreamPosition)
{
FileTransferData.FileStream.Seek(StreamPosition, SeekOrigin.Begin);
}
FileChunkData FileChunkData = new FileChunkData();
FileChunkData.Bytes = new byte[Host.FileTransferChunkSize];
FileChunkData.ChunkSize = FileTransferData.FileStream.Read(FileChunkData.Bytes,
0, Host.FileTransferChunkSize);
return(FileChunkData);
}
/// <summary>
/// Download a document chunk
/// </summary>
/// <param name="logonId"></param>
/// <param name="TransferId">Transfer id obtained when starting the download</param>
/// <param name="FilePosition">Position in the file to start downloading the chunk</param>
/// <returns></returns>
public DownloadChunkReturnValue DocumentDownloadChunk(Guid logonId, Guid TransferId, long FilePosition)
{
DownloadChunkReturnValue ReturnValue = new DownloadChunkReturnValue();
try
{
// Get the logged on user from the current logons and add their
// ApplicationSettings the list of concurrent sessions.
Host.LoadLoggedOnUser(logonId);
try
{
FileChunkData FileChunkData = FileTransfer.DownloadChunk(logonId, TransferId, FilePosition);
ReturnValue.ChunkSize = FileChunkData.ChunkSize;
ReturnValue.Bytes = FileChunkData.Bytes;
}
finally
{
// Remove the logged on user's ApplicationSettings from the
// list of concurrent sessions
Host.UnloadLoggedOnUser();
}
}
catch (Exception ex)
{
ReturnValue.Success = false;
ReturnValue.Message = ex.Message;
}
return(ReturnValue);
}
