Loading bitmaps from resource scripts
Author
How do you do this? Right now all my bitmap files are just files on my hard drive that anyone could alter if they played my game... so I''m going to put my bitmaps in a resource script in Visual C++, but now I need to write a new bitmap loader and I''m not sure how to do this with resource files. I know it''s something like LoadBitmap(NULL, resource) but I need to know exactly how to load the file and read it as a bitmap. Also, what I''m going to do is load the bitmaps and copy them to DirectDraw surfaces... then I wouldn''t need the resources in memory anymore after that, so do I have to free resources from memory just like normal files?
Thanks,
Al
This may or may not apply to you, depending on if you are rolling your own engine or not, but libCON is a free game engine that comes with a binary to compile all your resources into a file and the library already provides all the decompression stuff that you need to extract. You should be able to find it on the net.
Loading a bitmap from resources is very simple.
HBITMAP h_image;
BITMAP image;
HDC hdc_image, hdc_dds;
LPDDRAWSURFACE lpdds;
// Loading a bitmap
h_image = LoadBitmap(hInstance,MAKEINTRESOURCE(ID_OF_YOUR_BITMAP));
GetObject(h_image, sizeof(BITMAP), ℑ);
// Now you have bitmap loaded in and ready to use
// You may select it to device context and blit to DirectDraw surface
lpdds->GetDC(&hdc_dds);
hdc_image = CreateCompatibleDC(hdc_dds);
SelectObject(hdc_image, h_image);
BitBlt(hdc_dds,x,y,width,height,hdc_image,0,0,SRCCOPY);
lpdds->ReleaseDC(hdc_dds);
// Release resouces from memory
DeleteDC(hdc_image);
DeleteObject(h_image);
HBITMAP h_image;
BITMAP image;
HDC hdc_image, hdc_dds;
LPDDRAWSURFACE lpdds;
// Loading a bitmap
h_image = LoadBitmap(hInstance,MAKEINTRESOURCE(ID_OF_YOUR_BITMAP));
GetObject(h_image, sizeof(BITMAP), ℑ);
// Now you have bitmap loaded in and ready to use
// You may select it to device context and blit to DirectDraw surface
lpdds->GetDC(&hdc_dds);
hdc_image = CreateCompatibleDC(hdc_dds);
SelectObject(hdc_image, h_image);
BitBlt(hdc_dds,x,y,width,height,hdc_image,0,0,SRCCOPY);
lpdds->ReleaseDC(hdc_dds);
// Release resouces from memory
DeleteDC(hdc_image);
DeleteObject(h_image);
quote:Original post by Gromit
One can still edit the graphics in your game even if they are included in a resource file.
Not if they are encrypted.
Photon
I'm programming a 3d engine but I prefer making my own file format for the game resources, so I know exactly how to load them.
Visite our homepage: www.rarebyte.de.st
GA @ Rarebyte
Edited by - ga on 3/22/00 10:57:35 AM
Visite our homepage: www.rarebyte.de.st
GA @ Rarebyte
Edited by - ga on 3/22/00 10:57:35 AM
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