C#简单验证码识别 .（转）

这个可能是最简单的严整码了..

使用

 System.Net.WebClient _Client =new System.Net.WebClient();
            byte[] _ImageBytes =_Client.DownloadData("http://www.fjjj.gov.cn/Article/getcode.asp");

            MemoryStream _Memory = new MemoryStream(_ImageBytes);
            Bitmap _OldBitmap = (Bitmap)Image.FromStream(_Memory);
            pictureBox1.Image = _OldBitmap;

            this.Text = GetCodeText(_OldBitmap);

全部代码

   /// <summary>
        /// 获取验证码
        /// </summary>
        /// <param name="p_Bitmap">图形 http://www.fjjj.gov.cn/Article/getcode.asp</param>
        /// <returns>数值</returns>
        public static string GetCodeText(Bitmap p_Bitmap)
        {
            int _Width = p_Bitmap.Width / 4;
            int _Height = p_Bitmap.Height;

            Bitmap[] _Bitmap = new Bitmap[4];
            Rectangle _Rectangle = new Rectangle();
            _Rectangle.Width = _Width;
            _Rectangle.Height = _Height;
            for (int i = 0; i != _Bitmap.Length; i++)
            {
                _Bitmap[i] = p_Bitmap.Clone(_Rectangle, p_Bitmap.PixelFormat);
                _Rectangle.X += _Width;
            }
            int _Value1 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[0]));
            int _Value2 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[1]));
            int _Value3 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[2]));
            int _Value4 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[3]));

            string _Value = _Value1 == -1 ? "?" : _Value1.ToString();
             _Value += _Value2 == -1 ? "?" : _Value2.ToString();
             _Value += _Value3 == -1 ? "?" : _Value3.ToString();
             _Value += _Value4 == -1 ? "?" : _Value4.ToString();
             return _Value; 

        }
         

        private static string[] _TextBytes = new string[]
{
    "E17BEFBDF7DE7BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "FBE3BFFFFEFBEFBFFFFEFB83FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "E17BFFFDF7EFDFBF7FFFFE03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "E17BFFFDF7E37FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "EF9FBFFEFAEDBB0FFCFBEF1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "C0FBEFBFFFE07FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "E3F7EFBFFFE273EFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "C07BFFFEFBF7DFBFFFFEFDF7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "E17BEFBDF7E17BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    "E17BEFBDF7CE47FFFDF7EFC7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"    
};


        /// <summary>
        /// 获取二值化数据
        /// </summary>
        /// <param name="p_Bitmap">图形</param>
        /// <returns>二值化数据</returns>
        public static string GetImageText(Bitmap p_Bitmap)
        {
            int _Width = p_Bitmap.Width;
            int _Height = p_Bitmap.Height;
            BitmapData _Data = p_Bitmap.LockBits(new Rectangle(0, 0, _Width, _Height), ImageLockMode.ReadOnly, p_Bitmap.PixelFormat);

            byte[] _DataByte = new byte[_Data.Stride * _Height];

            Marshal.Copy(_Data.Scan0, _DataByte, 0, _DataByte.Length);

            BitArray _Bitarray = new BitArray(_DataByte.Length, true);

            int _Index = 0;
            for (int i = 0; i != _Height; i++)
            {
                int _WidthStar = i * _Data.Stride;
                for (int z = 0; z != _Width; z++)
                {
                    if (_DataByte[_WidthStar + (z * 3)] == 238 && _DataByte[_WidthStar + (z * 3) + 1] == 238 && _DataByte[_WidthStar + (z * 3) + 2] == 238)
                    {
                        _Bitarray[_Index] = true;
                    }
                    else
                    {
                        _Bitarray[_Index] = false;
                    }
                    _Index++;
                }
            }
            p_Bitmap.UnlockBits(_Data);

            int _ByteIndex =_Bitarray.Count / 8;
            if (_Bitarray.Count % 8 != 0) _ByteIndex++;

            byte[] _Temp =new byte[_ByteIndex];
            _Bitarray.CopyTo(_Temp, 0);

            return BitConverter.ToString(_Temp).Replace("-", "");
        }