bool Recognize(Point_2F *arr,uchar* b)
{

Mat src=cv::Mat(415,770,CV_8UC3,b);

/*for (int i=0;i<src.rows;i++) 
{
memcpy(src.ptr(i),b+i*src.cols,src.cols);
}*/
cv::imwrite("D:\\my_2_testfiles\\111_before.png",src);

// 保存的照片和原来的照片不一样而且大小也不一样？

}

 [DllImport("rectanglepoints.dll", EntryPoint = "Recognize", CallingConvention = CallingConvention.Cdecl)]
        static extern byte Recognize(IntPtr arr, IntPtr b);

{ 
 // Create a new bitmap.
            Bitmap bmp = new Bitmap("D:\\my_2_testfiles\\111.png");

            // Lock the bitmap's bits.  
            Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
            System.Drawing.Imaging.BitmapData bmpData =
                bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
                bmp.PixelFormat);
            // Get the address of the first line.
            IntPtr ptrImg = bmpData.Scan0;
bool ret;
    ret = Convert.ToBoolean(Recognize(IntPtr.Zero, ptrImg));   

 // Unlock the bits.
            bmp.UnlockBits(bmpData);

            Console.Read();

        }