private async void BarcodeScannerProviderConnection_StartSoftwareTriggerRequested(BarcodeScannerProviderConnection sender, BarcodeScannerStartSoftwareTriggerRequestEventArgs args)
{
using (args.GetDeferral())
{
bool readerStarted = false;
if (scannerEnabled)
{
if (frameReader == null)
{
// Create frame reader to read video frames
frameReader = await connection.CreateFrameReaderAsync(BitmapPixelFormat.Nv12, new BitmapSize()
{
Width = 1280, Height = 720
});
frameReader.FrameArrived += FrameReader_FrameArrived;
}
readerStarted = await frameReader.StartAsync();
}
if (readerStarted)
{
await args.Request.ReportCompletedAsync();
}
else
{
await args.Request.ReportFailedAsync();
}
}
}
protected virtual void Dispose(bool disposing)
{
if (disposed)
{
return;
}
if (disposing)
{
frameReader?.Dispose();
frameReader = null;
connection?.Dispose();
connection = null;
deferral?.Complete();
deferral = null;
disposed = true;
}
}
private async void FrameReader_FrameArrived(BarcodeScannerFrameReader sender, BarcodeScannerFrameReaderFrameArrivedEventArgs args)
{
if (!scannerEnabled)
{
// Return immediately if decoder is not enabled
return;
}
using (args.GetDeferral())
{
SoftwareBitmap bitmap = null;
using (BarcodeScannerVideoFrame frame = await sender.TryAcquireLatestFrameAsync())
{
if (frame != null)
{
// Build software bitmap from pixel data
bitmap = SoftwareBitmap.CreateCopyFromBuffer(frame.PixelData, frame.Format, (int)frame.Width, (int)frame.Height);
}
}
if (bitmap != null)
{
DecodeResult decodeResult = await decodeEngine.DecodeAsync(bitmap);
bitmap.Dispose();
bitmap = null;
// Report only if we have a result that is different from previous one.
if (decodeResult != null && !decodeResult.Equals(previousDecodeResult))
{
previousDecodeResult = decodeResult;
await connection.ReportScannedDataAsync(CreateBarcodeScannerReportFromString(decodeResult.Text, decodeResult.Symbology));
}
}
}
}
