###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.)
# SDL_RWFromMem

Use this function to prepare a read-write memory buffer for use with [SDL_RWops](SDL_RWops).

## Header File

Defined in [SDL_rwops.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_rwops.h)

## Syntax

```c
SDL_RWops* SDL_RWFromMem(void *mem, int size);
```

## Function Parameters

|        |          |                                                                 |
| ------ | -------- | --------------------------------------------------------------- |
| void * | **mem**  | a pointer to a buffer to feed an [SDL_RWops](SDL_RWops) stream. |
| int    | **size** | the buffer size, in bytes.                                      |

## Return Value

([SDL_RWops](SDL_RWops) *) Returns a pointer to a new
[SDL_RWops](SDL_RWops) structure, or NULL if it fails; call
[SDL_GetError](SDL_GetError)() for more information.

## Remarks

This function sets up an [SDL_RWops](SDL_RWops) struct based on a memory
area of a certain size, for both read and write access.

This memory buffer is not copied by the RWops; the pointer you provide must
remain valid until you close the stream. Closing the stream will not free
the original buffer.

If you need to make sure the RWops never writes to the memory buffer, you
should use [SDL_RWFromConstMem](SDL_RWFromConstMem)() with a read-only
buffer of memory instead.

## Version

This function is available since SDL 2.0.0.

## See Also

- [SDL_RWclose](SDL_RWclose)
- [SDL_RWFromConstMem](SDL_RWFromConstMem)
- [SDL_RWFromFile](SDL_RWFromFile)
- [SDL_RWFromFP](SDL_RWFromFP)
- [SDL_RWFromMem](SDL_RWFromMem)
- [SDL_RWread](SDL_RWread)
- [SDL_RWseek](SDL_RWseek)
- [SDL_RWtell](SDL_RWtell)
- [SDL_RWwrite](SDL_RWwrite)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryRWOPS](CategoryRWOPS)