NAME¶

SDL_RWFromFile - Use this function to create a new SDL_RWops
structure for reading from and/or writing to a named file.

SYNOPSIS¶

#include "SDL3/SDL.h"

SDL_RWops* SDL_RWFromFile(const char *file, const char *mode);

DESCRIPTION¶

The mode string is treated roughly the same as in a call to the C library's fopen(), even if SDL doesn't happen to use fopen() behind the scenes.

Available mode strings:

• "r": Open a file for reading. The file must exist.

• "w": Create an empty file for writing. If a file with the same name
already exists its content is erased and the file is treated as a new
empty file.

• "a": Append to a file. Writing operations append data at the end of the
file. The file is created if it does not exist.

• "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.

• "a+": Open a file for reading and appending. All writing operations are
performed at the end of the file, protecting the previous content to be
overwritten. You can reposition (fseek, rewind) the internal pointer to
anywhere in the file for reading, but writing operations will move it
back to the end of file. The file is created if it does not exist. NOTE : In order to open a file as a binary file, a "b" character has to be included in the mode string. This additional "b" character can either be appended at the end of the string (thus making the following compound modes: "rb", "wb", "ab", "r+b", "w+b", "a+b") or be inserted between the letter and the "+" sign for the mixed modes ("rb+", "wb+", "ab+"). Additional characters may follow the sequence, although they should have no effect. For example, "t" is sometimes appended to make explicit the file is a text file.

This function supports Unicode filenames, but they must be encoded in UTF-8 format, regardless of the underlying operating system.

As a fallback, SDL_RWFromFile () will transparently open a matching filename in an Android app's assets .

Closing the SDL_RWops
will close the file handle SDL is holding internally.

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¶

Returns a pointer to the SDL_RWops
structure that is created, or NULL on failure; call SDL_GetError () for more information.

AVAILABILITY¶

This function is available since SDL 3.0.0.

SEE ALSO¶

SDL_RWclose(3), SDL_RWFromConstMem(3), SDL_RWFromMem(3), SDL_RWread(3), SDL_RWseek(3), SDL_RWtell(3), SDL_RWwrite(3)