ARGHGH i am having many a problem with BMP''s and accessing the data in them. I can load them using LoadImage but then i don''t know how to access the info in it. I can blit it all i want, but i want to read it like a heightmap. I have tried to use ddutil.cpp and ddutil.h to get the info onto a dd surface, but they won''t compile, no matter what i do. i get this error d:\program files\microsoft visual studio\myprojects\terrain\ddutil.cpp(320) : fatal error C1010: unexpected end of file while looking for precompiled header directive i don''t know that error if you can help me, please, i am at a standstill, i have been trying to fix this for about 7 hours now... Razial

Hopefully this will help. After you call LoadImage(), try this:

HBITMAP bit = LoadImage(...);BITMAP bitmap;GetObject(bit, sizeof(BITMAP), &bitmap);// now you can access info about the bitmap using members// of the BITMAP structure// i.e.int width = bitmap.bmWidth;// check out the BITMAP members to see if it has what you want 

I don''t exactly what kind of info you want, but if you want like pixel values, you can just read in each pixel from the surface you want. If there''s something specific you want, post it.


Make games, it''s fun

Yeah, thanks for the responses. Um, well, i can''t find the precompiled header or anything, i dunno. I am implementing a RAW data loader. The problem with accessing the data in the BITMAP file is this:
BITMAP bm
bm.bmBits <- I believe this to be the surface, which is what i want to access, but it is a void*, so i (in my lack of knowledge) do not know how to access this... it says void* is zero if i try to index it
Oh well, thanks for the help
Razail

I use something similar to this:

  #include <stdio.h> //Our Standard I/O (C Standard).class CBitmap{public: unsigned short Width, Height; unsigned char BitDepth; unsigned char *data; unsigned char *pallete; unsigned char Loaded;public: CBitmap(){Loaded=0; data=0; pallete=0;}; CBitmap(char *FileName); void LoadBitmap(char *FileName); void KillBitmap(); ~CBitmap(){KillBitmap();};};void CBitmap::KillBitmap(){ if (Loaded) {  if (data) delete data;  if (pallete) delete pallete;  Loaded=0;  data=0;  pallete=0; }}void CBitmap::LoadBitmap(char *FileName){ FILE *in = fopen(FileName,"rb"); short tx,ty; unsigned long tSize, Offset; KillBitmap(); //Incase somethings loaded already! if (!in)  return; //File not found! if (getc(in)!=''B'' || getc(in)!=''M'') //Valid bitmap? {  fclose(in);  return; } fseek(in,18,0); Width=getw(in); //Read in Width fseek(in,22,0); Height=getw(in); //Read in height fseek(in,28,0); BitDepth=getc(in); //Read in bitdetph! tSize = Width; tSize*=Height; tSize*=BitDepth>>3; // bitdepth/8 = bitsperpixel! data = new unsigned char[tSize]; if (!data) {  fclose(in);  return; //Not enough memory! } fseek(in,54,0); if (BitDepth==8) //Need our pallete {  pallete = new unsigned char[256*3];  if (!pallete)  {   delete data;   fclose(in);   return; //Not enough memory!  }  Offset=0;  for (tx=0;tx!=256;++tx)  {   pallete[Offset+2]=getc(in); //Blue   pallete[Offset+1]=getc(in); //Green   pallete[Offset+0]=getc(in); //Red   getc(in); //Intensity... don''t need to store this!   Offset+=3;  } } for (ty=Height-1;ty!=-1;--ty) //Bitmaps are stored upside down! {  Offset=ty*Width*(BitDepth>>3);  for (tx=0;tx!=Width;++tx)  {   if (BitDepth==8)    data[Offset++]=getc(in);   else if (BitDepth==24)   {    data[Offset+2]=getc(in); //Blue    data[Offset+1]=getc(in); //Green    data[Offset+0]=getc(in); //Red    Offset+=3;   }  } } fclose(in);}CBitmap::CBitmap(char *FileName){ Loaded=0; data=0; pallete=0; LoadBitmap(FileName); //call loadbitmap!}  

Now, you can simply load an 8-bit/24-bit height map like so...

CBitmap HeightMap("hMap.bmp";

And it will be stored as HeightMap.data, HeightMap.Width, HeightMap.Height.. and HeightMap.BitDepth... of course you can change the class around to leave out the pallete (for heightmaps, you don''t need/want this), and only do 8-bit instead of 8/24.

Billy - BillyB@mrsnj.com if you need help with this.

Disclaimer: I did not test this code, and wrote it within this window, but I''m pretty sure it will work. If not, lemme know and I can fix it up for you. This loads the bitmap directly from the file and saves it to an array of unsigned chars, so no need for creating/deleting surfaces, etc, etc.