The BMP2TXT conveter (From the network)

The BMP2TXT conveter (From the network)

 1   // bmp_converter_2.cpp : Defines the entry point for the application.
 2   //
 3  
 4   #include "stdafx.h"
 5   // Primitive BMP to ASCII art generator
 6   // Reads source.bmp and outputs art.txt
 7   // Source must be 24-bit .bmp
 8  
 9   #include <iostream.h>
10   #include <windows.h>
11  
12   #define MAX_SHADES 10
13  
14   BITMAPFILEHEADER bfh;
15   BITMAPINFOHEADER bih;
16   RGBTRIPLE *image;
17   DWORD written;
18   HANDLE hfile;
19   int  imagesize;
20   char  shades[MAX_SHADES] = {'#','$','O','=','+','|','-','^','.',' '};
21   char  return1 = 0x0D;
22   char  return2 = 0x0A;
23   int  needle = 0;
24   int  average_color = 0;
25  
26   int  APIENTRY WinMain(HINSTANCE hInstance,
27                        HINSTANCE hPrevInstance,
28                        LPSTR     lpCmdLine,
29                         int        nCmdShow)
30   {
31         // Open a channel to source file
32        hfile = CreateFile("source.bmp",GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,NULL,NULL);
33         // Read header
34        ReadFile(hfile,&bfh,sizeof(bfh),&written,NULL);
35        ReadFile(hfile,&bih,sizeof(bih),&written,NULL);
36         // Read image
37        imagesize = bih.biSizeImage;
38        image =  new  RGBTRIPLE[imagesize];
39        ReadFile(hfile,image,imagesize*sizeof(RGBTRIPLE),&written,NULL);
40         // Close source file
41        CloseHandle(hfile);
42         // Open channel to output
43        hfile = CreateFile("art.txt",GENERIC_WRITE,NULL,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
44         // Keeping in mind the image is upside down, convert and write it
45        // It down-samples the image a bit in res too
46         for ( int  y = bih.biHeight-1;y >= 0;y--)
47        {
48              for ( int  x = 0;x < bih.biWidth;x++)
49             {
50                   // Get the average color
51                   average_color = (image[x+y*bih.biWidth].rgbtBlue+image[x+y*bih.biWidth].rgbtRed+image[x+y*bih.biWidth].rgbtGreen)/3;
52                   // Convert to a shade of 8
53                  average_color /= (256/MAX_SHADES);
54                   if (average_color >= MAX_SHADES)
55                       average_color -= 1;
56                   // Output
57                  WriteFile(hfile,&shades[average_color],1,&written,NULL);
58                   //WriteFile(hfile,&shades[average_color],1,&written,NULL);
59             }
60             WriteFile(hfile,&return1,1,&written,NULL);
61             WriteFile(hfile,&return2,1,&written,NULL);
62        }
63         // Close handle to output
64        CloseHandle(hfile);
65         return  0;
66   }
67  
68  

This code is just a rough implementation to convert a small .bmp file to text file.
It needs to be improved to be fit with bigger file or monofile. 

Compile and debug tool: VC++ 6, Win32 Simple Application.

Below is the testing result. The output txt file is often italic if the width is not dividable by 8 well.

Source.bmp (Must be placed in the project directory)

Output txt displayed as(only a small part of the whole pic):

                                    
                            #        
                    =#########=      
                ###############-     
               -###############=     
        =#####  ###############-     
   =##########= -######-             
   ###########=    -###=             
   =#########=     =###- =#=         
    -#######       #########-        
      -####=    -###########=        
       -###-    =#######=####        
       -###-    #####=  -####        
       -###-   -####  -=-####-       
       -###=   -########-####-       
       -###=   -#######--####-       
       -###=   -###-    -####-       
       -###=   =###--###=####=       
       -###=   =#############=       
       -###=   =####### -####=       
       =###-   =###=    =####-       
       =###-   -###= -#######-       
      -####-    #############-       
     -#####     =############-       
    ######=     -####  ######        
    #####-      ####   #####=        
    =##-       ####    -#####=       
              =###      -#####=      
             -###        -#####-     
             -#-          =####-     
                           =##=      
                            ##-