# toBit method

Uint8List toBit(

1. int threshold,
2. int referenceDataQualifier

)

Exports the face template as a Biometric Information Template (BIT) for enrolment on a smart card equipped with id3 Match-on-Card technology. Note: The threshold value is required and should be set according to the used Face Encoder and desired security level. Important: The reference data qualifier (RDQ) should be defined in accordance with the smart card application specifications.

param threshold The decision threshold, from 0 to 653535, to be applied during the face comparison on the smart card. See FaceMatcherThreshold for a list of typical values. param referenceDataQualifier Reference data qualifier. return A buffer that receives the biometric information template. throws FaceException An error has occurred during Face Library execution.

## Implementation

    Uint8List toBit(int threshold, int referenceDataQualifier) {
      Pointer<UnsignedChar> pData = nullptr;
      Pointer<Int> pDataSize = calloc();
      pDataSize[0] = -1;
      try {
        var err = faceSDK.id3FaceTemplate_ToBit(_pHandle.value, threshold, referenceDataQualifier, pData, pDataSize);
        if (err == FaceError.insufficientBuffer.value) {
          pData = calloc.allocate(pDataSize.value);
          err = faceSDK.id3FaceTemplate_ToBit(_pHandle.value, threshold, referenceDataQualifier, pData, pDataSize);
        }
        if (err != FaceError.success.value) {
          throw FaceException(err);
        }
        final vData = Uint8List.fromList(pData.cast<Uint8>().asTypedList(pDataSize.value));
        return vData;
      } finally {
        calloc.free(pData);
        calloc.free(pDataSize);
      }
    }