private async Task DownloadAsyncInternal(CancellationToken ct)
{
var headRequest = WebRequest.CreateHttp(Source);
headRequest.Method = "HEAD";
headRequest.AllowAutoRedirect = false;
var partFileInfo = new FileInfo(PartFilename);
var tryResume = (State == DownloadState.Paused) && _lastRequestDate.HasValue;
if (tryResume)
{
headRequest.IfModifiedSince = _lastRequestDate.Value;
}
else if (partFileInfo.Exists)
{
partFileInfo.Delete();
}
State = DownloadState.Downloading;
var getRequest = WebRequest.CreateHttp(Source);
// Send HEAD to investigate the headers and prepare proper GET request
using (var response = (HttpWebResponse)await headRequest.GetResponseAsync())
{
if (tryResume && ((response.StatusCode == HttpStatusCode.NotModified) ||
((response.LastModified != default(DateTime)) &&
(response.LastModified < _lastRequestDate.Value))))
{
if (partFileInfo.Exists)
{
DownloadedBytes = partFileInfo.Length;
getRequest.AddRange("bytes", partFileInfo.Length, TotalBytes);
}
}
else
{
TotalBytes = response.ContentLength;
CanBePaused =
string.Compare(response.Headers["Accept-Ranges"], "bytes", StringComparison.OrdinalIgnoreCase) ==
0;
}
}
ct.ThrowIfCancellationRequested();
// Actual download (GET)
using (var response = (HttpWebResponse)await getRequest.GetResponseAsync())
{
_lastRequestDate = DateTime.UtcNow;
var responseStream = response.GetResponseStream();
if (responseStream == null)
{
throw new IOException("Cannot get HTTP response stream");
}
// Append new data or create new file by default
var fileMode = FileMode.Append;
// If Content-Length doesn't match already known size, start downloading from scratch
if (response.ContentLength != TotalBytes - DownloadedBytes)
{
DownloadedBytes = 0;
TotalBytes = response.ContentLength;
fileMode = FileMode.Truncate;
EtaCalculator.Reset();
}
using (var fileStream = new FileStream(PartFilename, fileMode, FileAccess.Write, FileShare.None))
{
var buffer = new byte[64 * 1024];
int read;
while (
(read = await responseStream.ReadAsync(buffer, 0, buffer.Length, ct)) > 0)
{
await fileStream.WriteAsync(buffer, 0, read, ct);
DownloadedBytes += read;
EtaCalculator.Update(ProgressValue);
OnDownloadProgressChanged();
}
}
if (File.Exists(TargetFileName))
{
File.Delete(TargetFileName);
}
File.Move(PartFilename, TargetFileName);
}
}
public Task ProcessSelectedDocumentsAsync(IProgress <TaskProgress> prog, CancellationToken token, List <DocumentTypes> types, EtaCalculator pc, List <FileInfo> files)
{
var currentFile = 0.0;
var fileCount = Convert.ToDouble(files.Count);
return(Task.Run(() =>
{
foreach (var file in files)
{
var criteriaMatches = types.Select(o => new CriteriaMatchModel {
DocumentType = o
}).ToList();
using (var observedImage = CvInvoke.Imread(file.FullName))
{
Parallel.ForEach(_criteriaImages, (criteriaImage) =>
{
var criteriaFile = criteriaImage.Info;
var criteriaFileSplit = criteriaFile.Name.Split('-');
var type = types.First(c => c.DocumentType == criteriaFileSplit[0]);
var score = Classify(criteriaImage, observedImage);
var existingModel = criteriaMatches.First(c => c.DocumentType == type);
existingModel.Score += score;
existingModel.PdfFile = file.FullName;
});
}
if (token.IsCancellationRequested)
{
return;
}
var matchedCriteria = criteriaMatches.First(c => c.Score == criteriaMatches.Max(p => p.Score));
Console.WriteLine($"Score: {matchedCriteria.Score}");
if (matchedCriteria.Score >= matchedCriteria.DocumentType.AverageScore)
{
DocumentSelectionList.First(c => c.DocumentType == matchedCriteria.DocumentType.DocumentType).Matches += 1;
System.Windows.Application.Current.Dispatcher.Invoke(() =>
{
SelectionViewSource.Refresh();
});
var matchedFileName = file.Name.Substring(0, file.Name.Length - 4).Split('.')[0];
var matchedFile = PdfFiles.First(c => c.Contains(matchedFileName));
var matchedFileExtension = matchedFile.Substring(matchedFile.Length - 3);
if (matchedFileExtension.Equals("pdf", StringComparison.CurrentCultureIgnoreCase))
{
ExtractPageFromPdf(file, matchedCriteria.DocumentType.DocumentType, NamingModels);
}
else
{
CreatePdfFromImage(file, matchedCriteria.DocumentType.DocumentType, NamingModels);
}
}
currentFile++;
var rawProgress = (currentFile / fileCount);
var progress = rawProgress * 100;
var progressFloat = (float)rawProgress;
pc.Update(progressFloat);
if (pc.ETAIsAvailable)
{
var timeRemaining = pc.ETR.ToString(@"dd\.hh\:mm\:ss");
prog.Report(new TaskProgress
{
ProgressText = file.Name,
ProgressPercentage = progress,
ProgressText2 = timeRemaining
});
}
else
{
prog.Report(new TaskProgress
{
ProgressText = file.Name,
ProgressPercentage = progress,
ProgressText2 = "Calculating..."
});
}
}
}));
}