如何修复“抛出异常：读取访问冲突。 **Surface** 为 nullptr。 在 SDL2 C++ 中发生”

Question

Im trying to learn SDL2 with c++,

and every time I try to fill a surface i get this error, searched on the internet for a solution and haven`t found one yet:

SDL_Surface* Surface = NULL;

SDL_FillRect(Surface, NULL, SDL_MapRGB(Surface->format, 0, 255, 0));

every time I run this, it doesn't show an error but it does break the code and shows an X and a little box with the text "Exception thrown: read access violation. Surface was nullptr." near the FillRect line. I can click "Copy Details" and then it copies "Exception thrown: read access violation. ** Surface ** was nullptr. occurred"

Answer 1

You need to use something like

SDL_CreateRGBSurface

instead for NULL . Because you cant write to something that doesn't exist in memory.