private async void btnSearchMatchingImages_Click(object sender, RoutedEventArgs e)
{
// No need to perform any other operations if image file paths are not given
if (string.IsNullOrEmpty(this.txtLargeImagePath.Text) ||
string.IsNullOrEmpty(this.txtSmallImagePath.Text))
{
System.Windows.Forms.MessageBox.Show("All fields must be filled!");
return;
}
int scaleDownTimes = (int)this.slValue.Value;
string resizedLargeImagePath = this.txtLargeImagePath.Text.Replace(Path.GetFileNameWithoutExtension(this.txtLargeImagePath.Text), ResizedLargeImageNameWithoutExtension);
string resizedSmallImagePath = this.txtSmallImagePath.Text.Replace(Path.GetFileNameWithoutExtension(this.txtSmallImagePath.Text), ResizedSmallImageNameWithoutExtension);
// Clear previous data and files
_syncImageSearchResults.Clear();
_asyncImageSearchResults.Clear();
_resultDetails = null;
File.Delete(resizedLargeImagePath);
File.Delete(resizedSmallImagePath);
_imageLogic.DeletePreviousRectangleImages(Path.GetDirectoryName(this.txtLargeImagePath.Text));
if (scaleDownTimes > 0)
{
_imageLogic.ResizeImageAndSave(this.txtLargeImagePath.Text, resizedLargeImagePath, scaleDownTimes, 90L);
_imageLogic.ResizeImageAndSave(this.txtSmallImagePath.Text, resizedSmallImagePath, scaleDownTimes, 90L);
}
// Gets corresponding file path depending whether images has been resized or not
string largeImgPath = scaleDownTimes > 0 ? resizedLargeImagePath : this.txtLargeImagePath.Text;
string smallImgPath = scaleDownTimes > 0 ? resizedSmallImagePath : this.txtSmallImagePath.Text;
var watch = System.Diagnostics.Stopwatch.StartNew();
_tokenSource = new CancellationTokenSource();
var pOptions = new ParallelOptions();
var ui = TaskScheduler.FromCurrentSynchronizationContext();
pOptions.CancellationToken = _tokenSource.Token;
int imageSearchTimes = (int)this.slImageSearchTimes.Value;
bool isSynchronousOperation = this.rbtnRunSync.IsChecked == true;
// Update the UI before search has been started
this.txtStatus.Text = "In progress";
this.btnCancelSearch.IsEnabled = true;
this.btnSearchMatchingImages.IsEnabled = false;
this.btnViewDetails.IsEnabled = false;
try
{
await Task.Factory.StartNew(() =>
{
if (isSynchronousOperation)
{
for (int i = 0; i < imageSearchTimes; i++)
{
Rectangle rect = _computingLogic.GetImageParamsResult(largeImgPath, smallImgPath);
_syncImageSearchResults.Add(rect);
}
}
else
{
Parallel.For(0, imageSearchTimes, i =>
{
Rectangle rect = _computingLogic.GetImageParamsResult(largeImgPath, smallImgPath);
_asyncImageSearchResults.TryAdd(i, rect);
// The way to exit the parallel for-each loop
pOptions.CancellationToken.ThrowIfCancellationRequested();
});
}
}, _tokenSource.Token)
.ContinueWith((t) =>
{
_tokenSource.Dispose();
_tokenSource = null;
watch.Stop();
long elapsedMs = watch.ElapsedMilliseconds;
// Save result images where red rectangle is drawn
string rectLargeImagePath = this.txtLargeImagePath.Text.Replace(Path.GetFileNameWithoutExtension(this.txtLargeImagePath.Text), "rect_" + Path.GetFileNameWithoutExtension(this.txtLargeImagePath.Text));
string resizedRectLargeImagePath = string.Empty;
if (scaleDownTimes > 0)
{
resizedRectLargeImagePath = resizedLargeImagePath.Replace(Path.GetFileNameWithoutExtension(resizedLargeImagePath), "rect_" + ResizedLargeImageNameWithoutExtension);
Rectangle resizedSmallImageRect = this.GetSingleImageSearchResult(isSynchronousOperation);
// We want to get the original function position and size on the screen.
// Functions are scaled down only to increase performance!
Rectangle originalImageRect = _imageLogic.CalculateImageOriginalSizeAndPosition(resizedSmallImageRect, scaleDownTimes);
_imageLogic.DrawRectangleOntoImageAndSave(this.txtLargeImagePath.Text, rectLargeImagePath, originalImageRect);
_imageLogic.DrawRectangleOntoImageAndSave(resizedLargeImagePath, resizedRectLargeImagePath, this.GetSingleImageSearchResult(isSynchronousOperation));
}
else
{
_imageLogic.DrawRectangleOntoImageAndSave(this.txtLargeImagePath.Text, rectLargeImagePath, this.GetSingleImageSearchResult(isSynchronousOperation));
}
var originalLargeImage = Image.FromFile(this.txtLargeImagePath.Text);
// Map result details information
_resultDetails = new ResultDetails()
{
OriginalLargeImageWidth = originalLargeImage.Width,
OriginalLargeImageHeight = originalLargeImage.Height,
EllapsedTime = elapsedMs,
ImageResizedTimes = scaleDownTimes,
AsyncImageSearchResults = _asyncImageSearchResults,
SyncImageSearchResults = _syncImageSearchResults,
ImageSearchTimes = imageSearchTimes,
RectLargeImagePath = rectLargeImagePath,
ResizedRectLargeImagePath = resizedRectLargeImagePath,
IsSynchronousOperationPerformed = isSynchronousOperation,
};
originalLargeImage.Dispose();
// Update UI after search has been completed
this.lblElapsedTime.Content = "Ellapsed time(ms): " + elapsedMs;
this.txtStatus.Text = "Ready";
this.btnCancelSearch.IsEnabled = false;
this.btnSearchMatchingImages.IsEnabled = true;
this.btnViewDetails.IsEnabled = true;
}, _tokenSource.Token, TaskContinuationOptions.OnlyOnRanToCompletion, ui);
}
catch (OperationCanceledException)
{
}
catch (ObjectDisposedException)
{
}
catch (AggregateException ex)
{
ex.Handle((x) =>
{
return(true);
});
System.Windows.Forms.MessageBox.Show(ex.Message);
}
catch (Exception)
{
}
}