a pointer to an SDL_IOStream structure.
a printf() style format string. ... = additional parameters matching % tokens in the fmt string, if any.
The number of bytes written or 0 on failure; call SDL_GetError() for more information.
Threadsafety: This function is not thread safe.
SDL_IOvprintf SDL_WriteIO
Print to an SDL_IOStream data stream.
This function does formatted printing to the stream.