Short example of how CRC32 and the MD5 plug work
You should already have CRC32 installed, and MD5 is here:
http://www.scirra.com/forum/viewtopic.php?f=16&t=1613&p=11290&hilit=md5#p11290
http://dl.dropbox.com/u/666516/hashtest.zip
To test it change the included text file, and run the cap again.
I'll add: probably the easiest way to get the hash to use for a comparison is to send it to the system clipboard, and paste it into your cap.
I can still read the original file, so what's the point?
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You cant change it.
Can I change it in the runtime?
Edit: i think i see now how is this usefull. I can make my game database and then use this code so the player can't change the file, right?
Yep that's the idea.
Which one is better to use?
Either one really.
The only difference I see is CRC32 seems to need a tick before you can read it.