C/C++ - Loading Bitmap Files (Manually)

[Carl G]

maybe in my program is necesary to write:initwindow(400,400) in the top of the main function to open the graphic window, it depends on the winbgim installation

[Carl G]

thats the working code for 32 bit windows machine, in my example above i made a mistake, making an if without reading the file, in 64 bit machines it`s necesary to include iostream and fstream, that's how I load a BMP file of 24 bits per pixel, not for indexed coloured bitmaps, download winbgim from here: http://www.mediafire.com/file/z9wnl0...evCpp.zip/file, is in dev-c++, you probably have to load a couple of parameters for the linker, the path is: project, project options, parameters, and write: -lbgi -lgdi32 -luser32 -lcomdlg32 -luuid -loleaut32 -lole32 -mwindows -lwinmm, one thing more, after installing winbgim, go to dev c and create new project as console graphics application, this item must be in the project list if winbgim is properly installed, I wrote "write to shared memory", because I wrote the file also in memory although I did not access the file this way, but from the same file so:

#include <winbgim.h>
#include <string.h>
#include<windows.h>
#include<stdio.h>
#include <stdlib.h>
#include<fstream>
#include <iostream>
const char *Filename;

BITMAPFILEHEADER FileHeader;
BITMAPINFOHEADER InfoHeader;
int k;
typedef struct{
BYTE colorr;
BYTE colorg;
BYTE colorb;
}cine;

cine color;

HANDLE hArch, hProy;
LPSTR base,puntero;
DWORD tam;
int main()
{
int gdriver=9;
int gmode=2;
// initgraph(&gdriver,&gmode, "");
cleardevice();

UnmapViewOfFile(base);
CloseHandle(hProy);
CloseHandle(hArch);
char *p;
char *base;
DWORD buf;
Filename="D:\\music\\IMSLP00795-BWV0971\\01.bmp";
int gd = DETECT, gm;
int x = 320, y = 240, radius;
k=0;

int i;
int j;




FILE *File=NULL;
if(!Filename)
{
MessageBox(NULL,"Konnte Filename nicht finden!","Error",MB_OK|MB_ICONERROR);
}
else
{
File=fopen("D:\\music\\IMSLP00795-BWV0971\\01.bmp","rb");
}

fread(&FileHeader,sizeof(BITMAPFILEHEADER),1,File);
if(FileHeader.bfType != 0x4D42)
{
MessageBox(NULL,"Ungültiges Bildformat!","Error",MB_OK|MB_ICONERROR);
exit(1);
}
printf("tamaño total del archivo %d\n",FileHeader.bfSize);
printf("comienzo del mapa de bits (imagen en pixels) en bits %d\n",FileHeader.bfOffBits);

buf=FileHeader.bfOffBits/8; //offset from the begining of BMP file (pixel array)
printf("comienzo del mapa de bits en bytes desde el origen del archivo %d\n",buf);
fread(&InfoHeader,sizeof(BITMAPINFOHEADER),1,File);

printf("horizontal resolution in pixels por metro %li\n",InfoHeader.biWidth);
printf("vertical resolution in pixels por metro %li\n",InfoHeader.biHeight);
printf("numero de bits por pixel %d", InfoHeader.biBitCount);
initwindow(InfoHeader.biWidth,InfoHeader.biHeight);


hArch = CreateFile("D:\\music\\IMSLP00795-BWV0971\\01.bmp", /* file name */
GENERIC_ALL , /* read/write access */
0, /* no sharing of the file */
NULL, /* default security */
OPEN_ALWAYS, /* open new or existing file */
FILE_ATTRIBUTE_NORMAL, /* routine file attributes */
NULL); /* no file template */
if (hArch==INVALID_HANDLE_VALUE){

fprintf(stderr,"no puede abrirse el archivo");

}

hProy = CreateFileMapping(hArch, /* file handle */
NULL, /* default security */
PAGE_READWRITE, /* read/write access to mapped pages */
0, /* map entire file */
0,
TEXT("SharedObject")); /* named shared memory object */

/* write to shared memory */
base=(LPSTR)MapViewOfFile(hProy,FILE_MAP_ALL_ACCESS,0,0,0);
tam=GetFileSize(hArch,NULL);
int cont=0;
puntero=base;
p=base+FileHeader.bfOffBits;
k=0;int t=0,v,l;
fseek(File,FileHeader.bfOffBits,SEEK_SET );
int read=0,read2=0;
k=0;
for( i=0; i<InfoHeader.biWidth; i++ ) {
fread(&color,sizeof(cine),1,File);
read += sizeof(cine);
printf( "Pixel %d: %3d %3d %3d\n", i+1, int(color.colorb), int(color.colorg), int(color.colorr) );
}
if( read % 4 != 0 ) {
read2 = 4 - (read%4);
printf( "Padding: %d bytes\n", read2 );
//fread( &color, read2, 1, File );

}
fseek(File,FileHeader.bfOffBits,SEEK_SET );
for (i=0;i<InfoHeader.biHeight;i++)
for(j=0;j<InfoHeader.biWidth ;j++)

{
fread(&color,sizeof(cine),1,File);

putpixel(j,InfoHeader.biHeight- i,COLOR(int(color.colorb),int(color.colorg),int(color.colorr)));
if(j==InfoHeader.biWidth-1&&read2!=0)fseek(File,read2,SEEK_CUR);
}
fclose(File);

UnmapViewOfFile(base);
CloseHandle(hProy);
CloseHandle(hArch);
getch();
}