DOS环境屏幕截图到BMP文件的程序实现

//DOS下的截屏程序，并将图片保存为bmp格式


#include <graphics.h>
#include <string.h>
#include <stdio.h>
#include <alloc.h>
#include <stdlib.h>
#include <conio.h>


typedef struct
{
    unsigned char Blue;    
    unsigned char Green;
    unsigned char Red;    
    unsigned char Reserved;
} RGBQUAD;

typedef struct
{
    unsigned int type;
    long fileSize;
    long reserved;
    long offbits;
} BMPFILEHEADER;

/* bitmap info header */
typedef struct _BITMAPINFOHEADER
{

    long dwSize;
    long width;
    long height;
    int  planes;
    int  bpp;
    long compression;
    long sizeImage;
    long hResolution;
    long vResolution;
    long colors;
    long importantColors;
} BMPINFOHEADER;


/*VGA模式下的16种颜色*/
int Standcolor[16][3]=
    {
        /*  B   G   R       Index ColorName     */
        {   0,  0,  0},     /* 00 Black         */               
        { 255,  0,  0},     /* 01 Blue          */                
        {   0,128,  0},     /* 02 Green         */            
        { 255,255,  0},     /* 03 Cyan          */                
        {   0,  0,255},     /* 04 Red           */                 
        { 255,  0,255},     /* 05 Magenta       */                 
        {  42, 42,165},     /* 06 Brown         */               
        { 211,211,211},     /* 07 LightGray     */                   
        { 169,169,169},     /* 08 DarkGray      */                
        { 230,216,173},     /* 09 LightBlue     */                   
        { 144,238,144},     /* 10 LightGreen    */                  
        { 238,238,144},     /* 11 LightCyan     */