Hullo After i got a valid (other than zero) SDL_Surface pointer by the SDL_LoadBMP() function, I am calling SDL_DisplayFormat(); to copy the surface. But instead of copying the surface, the SDL_DisplayFormat function crahes the programm with the following error message: Application popup: Sprites&Animations.exe - Application Error : The instruction at "0x10025945" referenced memory at "0x00000134". The memory could not be "read". had someone an idea how this could be?

All this function does is converts one format to another. If you want an entirely new surface, you still have to manualy create it. There is a tutorial on my website on how to do this.

I dont want to creat a new one. But all tuts i read till now use this function to copy an surface. (example: http://cone3d.gamedev.net/cgi-bin/index.pl?page=tutorials/gfxsdl/tut3)

Ah, i got it, SDL_DisplayFormat crahes because SDL_Init has to be called bevore the DisplayFormat();