How to tell whether an error happened in SDL_RWread?


Returns the number of objects read, or 0 at error or end of file; call SDL_GetError() for more information.


You should not use the results of SDL_GetError() to decide if an error has occurred!

Then how should I decide if an error has occured?

In this specific case you should use SDL_GetError(). The general guidance means not to use it alone to decide if an error has occurred, but in the case of SDL_RWread() etc. you have already been notified that either an error or an end-of-file condition has occurred, so it’s OK to use SDL_GetError to distinguish between them.

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