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)