public void Scanner_OnScanResult(Result result)
{
this.result = result.Text;
if (!(string.IsNullOrEmpty(result?.Text)))
{
if (this.modal)
{
try
{
CodeScanned?.Invoke(this, new EventArgs());
}
catch (Exception ex)
{
Log.Critical(ex);
}
this.BackClicked();
}
else
{
Device.BeginInvokeOnMainThread(() =>
{
this.Link.Text = result.Text;
this.ScanGrid.IsVisible = false;
this.ManualGrid.IsVisible = true;
this.ModeButton.Text = "Scan Code";
this.OpenButton.Focus();
});
}
}
}
/// <summary>
/// Запустить сканирование
/// </summary>
public void StartScanning()
{
IsStarted = true;
// Get our preview properties
var previewProperties = _capture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
_scanningTimer = new Timer(async(state) =>
{
if (_isProcessingFrame || _capture == null || _capture.CameraStreamState != CameraStreamState.Streaming)
{
_scanningTimer?.Change(DelayBetweenAnalyzingFrames, Timeout.Infinite);
return;
}
var token = _scanCancellationToken.Token;
var delay = DelayBetweenAnalyzingFrames;
_isProcessingFrame = true;
VideoFrame destFrame = null;
VideoFrame frame = null;
try
{
// Setup a frame to use as the input settings
destFrame = new VideoFrame(Windows.Graphics.Imaging.BitmapPixelFormat.Bgra8, (int)previewProperties.Width, (int)previewProperties.Height);
// Get preview
frame = await _capture.GetPreviewFrameAsync(destFrame);
}
catch (Exception ex)
{
Debug.WriteLine("GetPreviewFrame Failed: {0}", ex);
}
if (token.IsCancellationRequested)
{
return;
}
Result result = null;
// Try decoding the image
try
{
if (frame != null)
{
await _dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
if (_bitmap == null)
{
_bitmap = new WriteableBitmap(frame.SoftwareBitmap.PixelWidth, frame.SoftwareBitmap.PixelHeight);
}
frame.SoftwareBitmap.CopyToBuffer(_bitmap.PixelBuffer);
result = _barcodeReader.Decode(_bitmap);
if (destFrame != null)
{
destFrame.Dispose();
destFrame = null;
}
frame.Dispose();
frame = null;
});
}
}
catch (Exception ex)
{
}
if (token.IsCancellationRequested)
{
return;
}
if (result != null)
{
CodeScanned?.Invoke(this, result);
delay = DelayBetweenContinuousScans;
}
_isProcessingFrame = false;
_scanningTimer?.Change(delay, Timeout.Infinite);
}, null, InitialDelayBeforeAnalyzingFrames, Timeout.Infinite);
}
