Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_AsyncIOFromFile - Use this function to create a new SDL_AsyncIO object for reading from and/or writing to a named file.
HEADER FILE
Defined in SDL3/SDL_asyncio.h
SYNOPSIS
#include "SDL3/SDL.h" SDL_AsyncIO * SDL_AsyncIOFromFile(const char *file, const char *mode);
DESCRIPTION
The mode string understands the following values: • "r": Open a file for reading only. It must exist. • "w": Open a file for writing only. It will create missing files or truncate existing ones. • "r+": Open a file for update both reading and writing. The file must exist. • "w+": Create an empty file for both reading and writing. If a file with the same name already exists its content is erased and the file is treated as a new empty file. There is no "b" mode, as there is only "binary" style I/O, and no "a" mode for appending, since you specify the position when starting a task. This function supports Unicode filenames, but they must be encoded in UTF-8 format, regardless of the underlying operating system. This call is _not_ asynchronous; it will open the file before returning, under the assumption that doing so is generally a fast operation. Future reads and writes to the opened file will be async, however.
FUNCTION PARAMETERS
file a UTF-8 string representing the filename to open. mode an ASCII string representing the mode to be used for opening the file.
RETURN VALUE
( SDL_AsyncIO *) Returns a pointer to the SDL_AsyncIO structure that is created or NULL on failure; call SDL_GetError () for more information.
AVAILABILITY
This function is available since SDL 3.2.0.
SEE ALSO
•(3), SDL_CloseAsyncIO(3), •(3), SDL_ReadAsyncIO(3), •(3), SDL_WriteAsyncIO(3) Simple Directmedia Layer SDL 3.2.8 SDL_AsyncIOFromFile(3)