// @nuget: System.IO.Compression

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.IO.Compression;

​

using System.Drawing;

​

namespace ConsoleApplication

{

    public class Program

    {

        public static byte[] StringToByteArray(string hex) {

            hex=new String(hex.Where(x => x>='0' && x<='F').ToArray());

    return Enumerable.Range(0, hex.Length)

                     .Where(x => x % 2 == 0)

                     .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))

                     .ToArray();

}

        static string Decompress(byte[] gzBuffer)

        {

            using (MemoryStream ms = new MemoryStream())

            {

                int msgLength = BitConverter.ToInt32(gzBuffer, 0);

                ms.Write(gzBuffer, 0, gzBuffer.Length - 0);

​

                byte[] buffer = new byte[msgLength];

​

                ms.Position = 0;

                using (GZipStream zip = new GZipStream(ms, CompressionMode.Decompress))

                {

                    zip.Read(buffer, 0, buffer.Length);

                }

​

                return Encoding.UTF8.GetString(buffer).Substring(0,999);

            }

        }

        // 通过计算rowSize*colSize区域的亮度平均值用一个字符替代

        public static String BitmapConvert(Bitmap bitmap, int rowSize, int colSize) 

        {

            StringBuilder result = new StringBuilder();

            //char[] charset = { 'M', '8', '0', 'V', '1', 'i', ':', '*', '|', '.', ' '};

            var charset="$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\"^`'. ".ToCharArray().Reverse().ToArray();

            int bitmapH = bitmap.Height;

            int bitmapW = bitmap.Width;

            for (int h = 0; h < bitmapH / rowSize; h++)

            {

                int offsetY = h * rowSize;

                for (int w = 0; w < bitmapW / colSize; w++)

                {

                    int offsetX = w * colSize;

                    float averBright = 0;

                    for (int j = 0; j < rowSize; j++)

                    {

                        for (int i = 0; i < colSize; i++)

                        { 

                            try

                            {

                                Color color = bitmap.GetPixel(offsetX + i, offsetY + j);

                                averBright += color.GetBrightness();

                            }

                            catch (ArgumentOutOfRangeException)

                            {

                                averBright += 0;

                            }

                        }

                    }

                    averBright /= (rowSize * colSize);

                    int index = (int)(averBright * charset.Length);

                    if (index == charset.Length)

                        index--;

                    result.Append(charset[charset.Length - 1 - index]);

                }

                result.Append("\r\n");

            }

            return result.ToString();

        }

        public static void Main(string[] args)

        {

            //Console.WriteLine(BitmapConvert(new Bitmap(Bitmap.FromStream(new MemoryStream(System.Convert.FromBase64String("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")))),

            //                              5,5));

            Console.WriteLine(BitmapConvert(new Bitmap(Bitmap.FromStream(new System.Net.WebClient().OpenRead("http://p21cajw5z.bkt.clouddn.com/app1/images/%E7%81%B0%E5%8E%9F%E5%93%80.jpg"))),

                                            20,13));

        }

    }

}