Subj : Re: Screen Capture function
To   : borland.public.cpp.borlandcpp
From : Jeff Baker
Date : Thu Jul 08 2004 04:27 pm

Okay, the problem was in the data field of the bmp file. There are 2 pixels
represented in each byte. So in order to fix the problem I shifted the
result of the first call to getpixel, incremented the horizontal count and
then added that to another call to getpixel. The function now works
correctly.

int SaveScreenToFile(char* file)
    {
    int x,y;
    char spacer = 0;
    char pixel;
    char
pal[16][3]={{0,0,0},{168,84,0},{0,168,84},{168,168,0},{0,84,168},{168,0,168}
,{0,84,168},{168,168,168},

{84,84,84},{252,0,0},{0,252,0},{252,252,0},{0,84,252},{252,0,252},{0,252,252
},{252,252,252}};
    struct
        {
        char id[2];
        long file_size,reserved,offset,header_size,width,height;
        short planes,bpp;
        long compression,bitmap_size,hres,vres,colors,important;
        } bmp;
    bmp.id[0]= 'B'; bmp.id[1]='M';
    bmp.file_size = 22326;
    bmp.reserved = 0;
    bmp.offset = 118;
    bmp.header_size = 40;
    bmp.width = 640;
    bmp.height = 480;
    bmp.planes = 1;
    bmp.bpp = 4;
    bmp.compression = 0;
    bmp.bitmap_size = 22208;
    bmp.hres = 3780;
    bmp.vres = 3780;
    bmp.colors = 16;
    bmp.important = 16;
    FILE *out;
    out = fopen(file,"wb");
    if (out == NULL) return(-1);
    fwrite(&bmp,sizeof(bmp),1,out);
    for (x = 0; x < 16; x++)
        {
        fputc(pal[x][RED],out);
        fputc(pal[x][GREEN],out);
        fputc(pal[x][BLUE],out);
        fputc(spacer,out); }
        for (y = (int)(bmp.height-1); y >= 0; y--)
            {
            for (x = 0; x <= (bmp.width-1); x++)
                {
                pixel = getpixel(x,y) << 4;
                x++;
                pixel += getpixel(x,y);
                fwrite(&pixel,sizeof(pixel),1,out);
                }
            }

.