SDL Wiki
(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Read from a data source.

Header File

Defined in <SDL3/SDL_iostream.h>


size_t SDL_ReadIO(SDL_IOStream *context, void *ptr, size_t size);

Function Parameters

SDL_IOStream * context a pointer to an SDL_IOStream structure.
void * ptr a pointer to a buffer to read data into.
size_t size the number of bytes to read from the data source.

Return Value

(size_t) Returns the number of bytes read, or 0 on end of file or other error.


This function reads up size bytes from the data source to the area pointed at by ptr. This function may read less bytes than requested. It will return zero when the data stream is completely read, or on error. To determine if there was an error or all data was read, call SDL_GetIOStatus().


This function is available since SDL 3.0.0.

See Also

CategoryAPI, CategoryAPIFunction, CategoryIOStream

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