//using System;
//using System.Collections.Generic;
//using System.Linq;
//using System.Text;
//using System.Threading.Tasks;
//using System.Runtime.InteropServices;
//using System.IO;
////using OpenCvSharp;

//// 提取人脸特征值
//namespace FaceAI
//{
//    // 人脸特征值结构体
//    [StructLayout(LayoutKind.Sequential, Pack = 1)]
//    public struct BDFaceFeature
//    {
//        public int size;
//        // 人脸的特征值，提取出来后是128个float的浮点值
//        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
//        public float[] data;// = new float[128];
//    }
//    // 人脸特征值结构体
//    [StructLayout(LayoutKind.Sequential, Pack = 1)]
//    public struct BDDepthFeature
//    {
//        public int size;
//        // 人脸的深度特征值，提取出来后是256个float的浮点值
//        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
//        public float[] data;// = new float[256];
//    }
//    class FaceFeature
//    {
//        // 提取人脸特征值
//        [DllImport("BaiduFaceApi.dll", EntryPoint = "face_feature", CharSet = CharSet.Ansi
//            , CallingConvention = CallingConvention.Cdecl)]
//        // 返回num为特征值的人数,type为0表示提取生活照的特征值，1表示nir的特征值
//        public static extern int face_feature(IntPtr feature, IntPtr box, IntPtr mat, int type);
       


//        public void test_face_feature()
//        {
//            long t_begin = TimeUtil.get_time_stamp();
//            BDFaceFeature[] fea1 = test_get_face_feature_by_path("../images/2.jpg");
//            long t_end = TimeUtil.get_time_stamp();
//            Console.WriteLine("get feature time cost is:" + (t_end - t_begin));
//        }

//        // 获取特征值，传入图片路径
//        public BDFaceFeature[] test_get_face_feature_by_path(string img_path)
//        {
//            // 特征值的长度，128个float值
//            int dim_count = 128;
//            Mat mat = Cv2.ImRead(img_path);
//            // 假设提取的人数，需要比实际的人数多，因为需要提取分配内存
//            int faceNum = 5;
//            BDFaceFeature[] feaList = new BDFaceFeature[faceNum];
//            for(int i = 0; i < faceNum; i++)
//            {
//                feaList[i].data = new float[dim_count];
//                feaList[i].size = 0;
//            }
           
//            if (mat.Empty())
//            {
//                return null;
//            }

//            int sizeFeature = Marshal.SizeOf(typeof(BDFaceFeature));
//            IntPtr ptFea = Marshal.AllocHGlobal(sizeFeature * faceNum);

//            // 构造返回的人脸框数据
//            BDFaceBBox[] info = new BDFaceBBox[faceNum];
//            int sizeBox = Marshal.SizeOf(typeof(BDFaceBBox));
//            IntPtr ptBox = Marshal.AllocHGlobal(sizeBox * faceNum);
//            // 返回num为特征值的人数,type为0表示提取生活照的特征值，1表示证件照的特征值，2表示nir的特征值
//            int type = 0;
//            int num = face_feature(ptFea, ptBox, mat.CvPtr, type);
//            if (num <= 0)
//            {
//                return null;
//            }
//            Console.WriteLine("face num is:{0}", num);
//            // 请确保faceNum大于num, faceNum为c#期望的检测人数，需要预先分配内存，否则无法获取
//            if (num > faceNum)
//            {
//                num = faceNum;
//            }
//            for (int index = 0; index < num; index++)
//            {
//                IntPtr ptrF = new IntPtr();
//                IntPtr ptrB = new IntPtr();
//                if (8 == IntPtr.Size)
//                {
//                    ptrF = (IntPtr)(ptFea.ToInt64() + sizeFeature * index);
//                    ptrB = (IntPtr)(ptBox.ToInt64() + sizeBox * index);
//                }
//                else if (4 == IntPtr.Size)
//                {
//                    ptrF = (IntPtr)(ptFea.ToInt32() + sizeFeature * index);
//                    ptrB = (IntPtr)(ptBox.ToInt32() + sizeBox * index);
//                }
//                feaList[index] = (BDFaceFeature)Marshal.PtrToStructure(ptrF, typeof(BDFaceFeature));
//                Console.WriteLine("feaList[index].size is:{0}", feaList[index].size);
                

//                for (int k = 0; k < feaList[index].size; k++)
//                {
//                    Console.WriteLine("feature is {0}:", feaList[index].data[k]);
//                }

//                info[index] = (BDFaceBBox)Marshal.PtrToStructure(ptrB, typeof(BDFaceBBox));

//                // 索引值
//                Console.WriteLine("detect score is:{0}", info[index].index);
//                // 置信度
//                Console.WriteLine("detect score is:{0}", info[index].score);             
//                // 人脸宽度
//                Console.WriteLine("detect mWidth is:{0}", info[index].width);
//                // 中心点X,Y坐标
//                Console.WriteLine("detect mCenter_x is:{0}", info[index].center_x);
//                Console.WriteLine("detect mCenter_y is:{0}", info[index].center_y);
//            }
//            // 绘制人脸框
//            FaceDraw.draw_rects(ref mat, faceNum, info);

//            //mat.ImWrite("detect.jpg");
//            mat.Release();
//            return feaList;
//        }
       
//    }
//}