###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!) # SDL_GetWindowSize Get the size of a window's client area. ## Syntax ```c int SDL_GetWindowSize(SDL_Window *window, int *w, int *h); ``` ## Function Parameters | | | | -------------- | -------------------------------------------------------------- | | **window** | the window to query the width and height from | | **w** | a pointer filled in with the width of the window, may be NULL | | **h** | a pointer filled in with the height of the window, may be NULL | ## Return Value Returns 0 on success or a negative error code on failure; call [SDL_GetError](SDL_GetError)() for more information. ## Remarks NULL can safely be passed as the `w` or `h` parameter if the width or height value is not desired. The window pixel size may differ from its window coordinate size if the window is on a high pixel density display. Use [SDL_GetWindowSizeInPixels](SDL_GetWindowSizeInPixels)() or [SDL_GetRenderOutputSize](SDL_GetRenderOutputSize)() to get the real client area size in pixels. ## Version This function is available since SDL 3.0.0. ## Related Functions * [SDL_GetRenderOutputSize](SDL_GetRenderOutputSize) * [SDL_GetWindowSizeInPixels](SDL_GetWindowSizeInPixels) * [SDL_SetWindowSize](SDL_SetWindowSize) ---- [CategoryAPI](CategoryAPI), [CategoryVideo](CategoryVideo)