using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.InteropServices;

namespace RLSB
{
    /// <summary>
    /// err = 0 正常，非0表示错误
    /// </summary>
    /// <param name="err"></param>
    /// <param name="content"></param>
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    public delegate void NameCallBack(int err, string content  );

    public class libFace
    {
         /// <summary>
        /// 传图片文件路径，返回识别的标签，top决定返回前几个。
        /// 一张图片可能识别出来与多个标签都匹配，而top是决定返回匹配最高的几个标签
        /// </summary>
        /// <param name="filename"></param>
        /// <param name="top"></param>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll",CallingConvention=CallingConvention.Cdecl)]
        public extern static int GetNameByFile(string filename, int top, [MarshalAs(UnmanagedType.FunctionPtr)] NameCallBack cb);
        /// <summary>
        /// 根据特证码返回识别的标签，top决定返回前几个。
        /// </summary>
        /// <param name="strfeature"></param>
        /// <param name="top"></param>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll",CallingConvention=CallingConvention.Cdecl)]
        public extern static int GetNameByFeature(string strfeature, int top, [MarshalAs(UnmanagedType.FunctionPtr)] NameCallBack cb);

        /// <summary>
        /// 将图片训练成人脸库与label对应
        /// </summary>
        /// <param name="filename">图片路径</param>
        /// <param name="label">标签名</param>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll",CallingConvention=CallingConvention.StdCall)]
        public extern static bool AddFileLabel(string filename, string label);
        //public extern static bool AddFileLabel(IntPtr filename, IntPtr label);
        /// <summary>
        /// 返回所标签，通过“;”分割，如：ZZZ;CCC;DDD
        /// </summary>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll", CallingConvention = CallingConvention.StdCall)]
        public extern static int GetAllLabel([MarshalAs(UnmanagedType.FunctionPtr)] NameCallBack cb);

        /// <summary>
        /// 返回所标签与对应的图片文件名，通过“;”分割，标签与文件名用“，”割开，如：ZZZ,333.jpg;CCC,444.jpg
        /// 文件在FaceRecognition.dll所在路径下的modelimages目录下面
        /// </summary>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll", CallingConvention = CallingConvention.StdCall)]
        public extern static int GetAllLabelAndImage([MarshalAs(UnmanagedType.FunctionPtr)] NameCallBack cb);
        /// <summary>
        /// 删除图片库中的素材，按标签名（会删除所有符合标签的素才）
        /// </summary>
        /// <param name="label"></param>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll", CallingConvention = CallingConvention.StdCall)]
        public extern static bool DelLibByLabel( string label );

        /// <summary>
        /// 删除图片库中的素材，按图片文件名（文件名是库自动生成的，可以通过GetAllLabelAndImage返回）
        /// </summary>
        /// <param name="filename"></param>
        /// <returns></returns>
        [DllImport("FaceRecognition.dll",CallingConvention=CallingConvention.StdCall)]
        public extern static bool DelLibByFileName( string filename );
        public static bool TrainFileLabel(string filen, string label)
        {
            return AddFileLabel(filen, label);
            //IntPtr ptrPicPath = mallocIntptr(filen);
            //IntPtr ptrLabel = mallocIntptr(label);
            ////    ret = TrainImage(ptrPicPath, ptrLabel); ;// Marshal.GetFunctionPointerForDelegate(ccb));
            //bool ret=AddFileLabel(ptrPicPath, ptrLabel);
            //Marshal.FreeHGlobal(ptrPicPath);
            //Marshal.FreeHGlobal(ptrLabel);
            //return ret;
        }
        //public delegate int CheckImageDG(IntPtr imagePath, CheckCallBack ccb);
        //public static bool DeleteLabel(string label)
        //{
        //    IntPtr ptrLabel = mallocIntptr(label);
        //    int n = DeleteLabelByName(ptrLabel);
        //    Marshal.FreeHGlobal(ptrLabel);
        //    return 1 == n;
        //}
        //public static int DoCheckImage(string picpath, CheckCallBack ccb)
        //{
        //    IntPtr ptrPicPath = mallocIntptr(picpath);
        //    int r = CheckImage(ptrPicPath,ccb);;// Marshal.GetFunctionPointerForDelegate(ccb));
        //    Marshal.FreeHGlobal(ptrPicPath);
        //    return r;

        //}
        //public static int DoTrainImage(string picpath, string label)
        //{
        //    int ret = 0;
        //    IntPtr ptrPicPath = mallocIntptr(picpath);
        //    IntPtr ptrLabel = mallocIntptr(label);
        //    ret = TrainImage(ptrPicPath, ptrLabel); ;// Marshal.GetFunctionPointerForDelegate(ccb));
        //    Marshal.FreeHGlobal(ptrPicPath);
        //    Marshal.FreeHGlobal(ptrLabel);
        //    return ret;
        //}
        /// <summary>   
        /// 根据数据的长度申请非托管空间   
        /// </summary>   
        /// <param name="strData">要申请非托管空间的数据</param>   
        /// <returns>指向非拖管空间的指针</returns>   
        private static IntPtr mallocIntptr(string strData)
        {
            //先将字符串转化成字节方式   
            Byte[] btData = System.Text.Encoding.Default.GetBytes(strData);

            //申请非拖管空间   
            IntPtr m_ptr = Marshal.AllocHGlobal(btData.Length);

            //给非拖管空间清０    
            Byte[] btZero = new Byte[btData.Length + 1]; //一定要加1,否则后面是乱码，原因未找到   
            Marshal.Copy(btZero, 0, m_ptr, btZero.Length);

            //给指针指向的空间赋值   
            Marshal.Copy(btData, 0, m_ptr, btData.Length);

            return m_ptr;
        }

        /// <summary>   
        /// 根据长度申请非托管空间   
        /// </summary>   
        /// <param name="strData">要申请非托管空间的大小</param>   
        /// <returns>指向非拖管空间的指针</returns>   
        private static IntPtr mallocIntptr(int length)
        {
            //申请非拖管空间   
            IntPtr m_ptr = Marshal.AllocHGlobal(length);

            //给非拖管空间清０    
            Byte[] btZero = new Byte[length + 1]; //一定要加1,否则后面是乱码，原因未找到   
            Marshal.Copy(btZero, 0, m_ptr, btZero.Length);

            //给指针指向的空间赋值   
            Marshal.Copy(btZero, 0, m_ptr, length);

            return m_ptr;
        }  

    }
}