public static extern int ASFFaceFeatureCompare(IntPtr pEngine, ref AsfFaceFeature faceFeature1, ref AsfFaceFeature faceFeature2, out float result);
public static extern int ASFFaceFeatureExtract(IntPtr pEngine, int width, int height, int format, IntPtr pImageData, ref AsfSingleFaceInfo faceInfo, out AsfFaceFeature faceFeature);