public static async Task <List <BarcodeResult> > ScanFromImage(byte[] imageArray)
{
UIImage image = new UIImage(NSData.FromArray(imageArray));
var visionImage = new VisionImage(image);
VisionImageMetadata metadata = new VisionImageMetadata();
VisionApi vision = VisionApi.Create();
VisionBarcodeDetector barcodeDetector = vision.GetBarcodeDetector(Configuration.BarcodeDetectorSupportFormat);
VisionBarcode[] barcodes = await barcodeDetector.DetectAsync(visionImage);
if (barcodes == null || barcodes.Length == 0)
{
return(new List <BarcodeResult>());
}
List <BarcodeResult> resultList = new List <BarcodeResult>();
foreach (var barcode in barcodes)
{
resultList.Add(new BarcodeResult
{
BarcodeType = Methods.ConvertBarcodeResultTypes(barcode.ValueType),
DisplayValue = barcode.DisplayValue,
RawValue = barcode.RawValue
});
}
return(resultList);
}
public CaptureVideoDelegate()
{
metadata = new VisionImageMetadata();
vision = VisionApi.Create();
barcodeDetector = vision.GetBarcodeDetector(Configuration.BarcodeDetectorSupportFormat);
// Using back-facing camera
var devicePosition = AVCaptureDevicePosition.Back;
var deviceOrientation = UIDevice.CurrentDevice.Orientation;
switch (deviceOrientation)
{
case UIDeviceOrientation.Portrait:
metadata.Orientation = devicePosition == AVCaptureDevicePosition.Front ? VisionDetectorImageOrientation.LeftTop : VisionDetectorImageOrientation.RightTop;
break;
case UIDeviceOrientation.LandscapeLeft:
metadata.Orientation = devicePosition == AVCaptureDevicePosition.Front ? VisionDetectorImageOrientation.BottomLeft : VisionDetectorImageOrientation.TopLeft;
break;
case UIDeviceOrientation.PortraitUpsideDown:
metadata.Orientation = devicePosition == AVCaptureDevicePosition.Front ? VisionDetectorImageOrientation.RightBottom : VisionDetectorImageOrientation.LeftBottom;
break;
case UIDeviceOrientation.LandscapeRight:
metadata.Orientation = devicePosition == AVCaptureDevicePosition.Front ? VisionDetectorImageOrientation.TopRight : VisionDetectorImageOrientation.BottomRight;
break;
case UIDeviceOrientation.FaceUp:
case UIDeviceOrientation.FaceDown:
case UIDeviceOrientation.Unknown:
metadata.Orientation = VisionDetectorImageOrientation.LeftTop;
break;
}
}
public static async Task <List <BarcodeResult> > ScanFromImage(byte[] imageArray)
{
UIImage image = new UIImage(NSData.FromArray(imageArray));
var visionImage = new VisionImage(image);
VisionImageMetadata metadata = new VisionImageMetadata();
VisionApi vision = VisionApi.Create();
VisionBarcodeDetector barcodeDetector = vision.GetBarcodeDetector(Configuration.BarcodeDetectorSupportFormat);
VisionBarcode[] barcodes = await barcodeDetector.DetectAsync(visionImage);
if (barcodes == null || barcodes.Length == 0)
{
return(new List <BarcodeResult>());
}
List <BarcodeResult> resultList = new List <BarcodeResult>();
foreach (var barcode in barcodes)
{
var points = barcode.CornerPoints.ToList().ConvertAll(nsvalue => nsvalue.PointFValue);
resultList.Add(new BarcodeResult
{
BarcodeType = Methods.ConvertBarcodeResultTypes(barcode.ValueType),
DisplayValue = barcode.DisplayValue,
Points = points.Select(p => (p.X / (double)image.Size.Width, p.Y / (double)image.Size.Height)).ToList()
});
/// <summary>
/// <see cref="LabelReaderBase.GetRawBarcodeTextFromImageAsync(object)"/>
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public override async Task <string> GetRawBarcodeTextFromImageAsync(object image)
{
CoreMedia.CMSampleBuffer iOSImage = (CoreMedia.CMSampleBuffer)image;
VisionImage visionImage = new VisionImage(iOSImage);
visionImage.Metadata = new VisionImageMetadata {
Orientation = GetOrientation()
};
VisionApi api = VisionApi.Create();
VisionBarcodeDetector barcodeDetector = api.GetBarcodeDetector(new VisionBarcodeDetectorOptions(VisionBarcodeFormat.QRCode));
VisionBarcode[] barcodes = await barcodeDetector.DetectAsync(visionImage);
if (barcodes.Length <= 0)
{
return(String.Empty);
}
return(barcodes.First().RawValue);
}
void UseBarcodeScanningModel()
{
var options = new VisionBarcodeDetectorOptions(VisionBarcodeFormat.All);
var barcodeDetector = vision.GetBarcodeDetector(options);
var image = new VisionImage(ImgSample.Image);
barcodeDetector.Detect(image, HandleVisionBarcodeDetectionCallback);
void HandleVisionBarcodeDetectionCallback(VisionBarcode [] barcodes, NSError error)
{
if (error != null)
{
TxtData.Text = error.Description;
return;
}
if (barcodes == null || barcodes.Length == 0)
{
TxtData.Text = "No barcodes were found.";
return;
}
var stringBuilder = new StringBuilder();
foreach (var barcode in barcodes)
{
stringBuilder.AppendLine($"Raw Value: {barcode.RawValue}");
stringBuilder.AppendLine($"Display Value: {barcode.DisplayValue}");
stringBuilder.AppendLine($"Format: {barcode.Format}");
stringBuilder.AppendLine($"Value Type: {barcode.ValueType}");
stringBuilder.AppendLine();
}
TxtData.Text = stringBuilder.ToString();
}
}