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Read/Write Offsets and Seeking

Learn how to manipulate the read/write offset of an SDL_RWops object to control stream interactions.

Ryan McCombe
Published
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Questions & Answers

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Seeking Past EOF
If we seek past the end of a file using SDL_RWseek(), what happens when we try to read or write data? Will it extend the file, or will it result in an error? How can we use this behaviour to append to a file?
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Multiple High Scores
How can we modify the high score example to store multiple high scores (e.g., the top 10) instead of just one?
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Closing SDL_RWops
Why is it important to close the SDL_RWops using SDL_RWclose() after we're finished with it? What are the potential consequences of not closing it?
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Binary vs. Text Mode
What is the difference between binary mode ("wb" or "rb") and text mode ("w" or "r") when opening a file with SDL_RWFromFile()? Why is it important to use binary mode?
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Storing Player Name
How could we modify the high score example to also store the player's name along with the score?
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Searching Large Files
If we have a very large file, how can we efficiently search for a specific piece of data without reading the entire file into memory?
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