/// <summary>
/// Poll the native API for barcode scanner results.
/// </summary>
/// <returns>
/// An array of BarcodeData that contains the results
/// that the scanner has collected since the last call to this function. This array
/// may be empty if there are no new results.
/// </returns>
private static List <BarcodeData> MLBarcodeScannerGetResults()
{
try
{
// get results from native api
MLResult.Code resultCode = NativeBindings.MLBarcodeScannerGetResult(Instance.Handle, out NativeBindings.MLBarcodeScannerResultArray scannerResults);
if (MLResult.IsOK(resultCode))
{
var managedResults = new List <BarcodeData>((int)scannerResults.Count);
for (int i = 0; i < scannerResults.Count; i++)
{
// marshal native array into native structs
long address = scannerResults.Detections.ToInt64() + (Marshal.SizeOf <IntPtr>() * i);
NativeBindings.MLBarcodeScannerResult detectedResult = Marshal.PtrToStructure <NativeBindings.MLBarcodeScannerResult>(Marshal.ReadIntPtr(new IntPtr(address)));
MLPluginLog.Debug($"MLBarcodeScanner results found: {detectedResult}");
// create managed version of data
UnityEngine.Pose pose;
if (((BarcodeType)detectedResult.Type) == BarcodeType.QR)
{
if (!MagicLeapNativeBindings.UnityMagicLeap_TryGetPose(detectedResult.CoordinateFrameUID, out pose))
{
MLPluginLog.Error($"Barcode Scanner could not get pose data for coordinate frame id '{detectedResult.CoordinateFrameUID}'");
pose = Pose.identity;
}
}
else
{
pose = Pose.identity;
}
managedResults.Add
(
BarcodeData.Create
(
(BarcodeType)detectedResult.Type,
pose,
detectedResult.DecodedData.Data,
detectedResult.DecodedData.Size,
detectedResult.ReprojectionError
)
);
}
// release native memory so results can be polled again
if (MLResult.IsOK(NativeBindings.MLBarcodeScannerReleaseResult(scannerResults)))
{
return(managedResults);
}
else
{
MLPluginLog.Error($"MLBarcodeScanner.NativeBindings.MLBarcodeScannerReleaseResult failed when trying to release the results' memory. Reason: {MLResult.CodeToString(resultCode)}");
return(managedResults);
}
}
else
{
MLPluginLog.Error($"MLBarcodeScanner.MLBarcodeScannerGetResult failed to obtain a result. Reason: {resultCode}");
return(default);