VisionExtensions.cs

namespace VisionExtensions {
	using System.Runtime.InteropServices;

	using CoreFoundation;
	using ObjCRuntime;
	using Vision;

	public enum VNBarcodeCompositeType : long {
		None = 0,
		Linked,
		Gs1TypeA,
		Gs1TypeB,
		Gs1TypeC,
	}

	public static class VNBarcodeObservation_Extensions {

		public static bool GetIsGS1DataCarrier (this VNBarcodeObservation self)
		{
			var sel = Selector.GetHandle ("isGS1DataCarrier");
			var rv = byte_objc_msgSend (self.GetHandle (), sel);
			return rv != 0;
		}

		public static bool GetIsColorInverted (this VNBarcodeObservation self)
		{
			var sel = Selector.GetHandle ("isColorInverted");
			var rv = byte_objc_msgSend (self.GetHandle (), sel);
			return rv != 0;
		}

		public static VNBarcodeCompositeType GetSupplementalCompositeType (this VNBarcodeObservation self)
		{
			var sel = Selector.GetHandle ("supplementalCompositeType");
			var rv = VNBarcodeCompositeType_objc_msgSend (self.GetHandle (), sel);
			return rv;
		}

		public static string? GetSupplementalPayloadString (this VNBarcodeObservation self)
		{
			var sel = Selector.GetHandle ("supplementalPayloadString");
			var rv = IntPtr_objc_msgSend (self.GetHandle (), sel);
			return CFString.FromHandle (rv, false);
		}

		public static NSData? GetSupplementalPayloadData (this VNBarcodeObservation self)
		{
			var sel = Selector.GetHandle ("supplementalPayloadData");
			var rv = IntPtr_objc_msgSend (self.GetHandle (), sel);
			return Runtime.GetNSObject<NSData> (rv, false);
		}

		const string VisionLibrary = "/System/Library/Frameworks/Vision.framework/Vision";

		[DllImport (VisionLibrary)]
		static extern IntPtr IntPtr_objc_msgSend (IntPtr handle, IntPtr selector);

		[DllImport (VisionLibrary)]
		static extern byte byte_objc_msgSend (IntPtr handle, IntPtr selector);

		[DllImport (VisionLibrary)]
		static extern VNBarcodeCompositeType VNBarcodeCompositeType_objc_msgSend (IntPtr handle, IntPtr selector);
	}
}