SDL2 C++ Taking a screenshot

Question

Hi I would like to know if it is possible to simply take a screenshot with SDL2. I tried SDL_GetWindowSurface but I get an error saying:

Answer 1

It seems like you are mixing the rendering systems. That method will only work in the context of software rendering. For hardware rendering you should use the method SDL_RenderReadPixels(). To save the screenshot you would need a code like that:

SDL_Surface *sshot = SDL_CreateRGBSurface(0, w, h, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
SDL_RenderReadPixels(renderer, NULL, SDL_PIXELFORMAT_ARGB8888, sshot->pixels, sshot->pitch);
SDL_SaveBMP(sshot, "screenshot.bmp");
SDL_FreeSurface(sshot);

Where w and h are the screen width and height (you can get these values using SDL_GetRendererOutputSize()).