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Socoder -> Blitz -> Just out of curiosity... |
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| Tue, 20 Mar 2007, 10:57 | |
Blitz3Dman
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Is it possible to write individual bits (booleans) to files using B3D? If so how?
-=-=- There are 10 kinds of people in this world - ( Insert 16 remarks about to what extent people know hex here ) |
| Tue, 20 Mar 2007, 11:23 | |
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mike_g |
I'm pretty sure you cant  Intergers allocate 4 Bytes in Blitz. You could use an integer to hold up to 32 bool values using bit shifting if you really wanted to. |edit| If you are writing to files then you can write Bytes, but not individual bits. |edit| |
| Tue, 20 Mar 2007, 16:24 | |
Jayenkai
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Yeah, as Mike suggests, you can use a combination of bitshifting and bytes to do what you need. Or, use these handy GetBit and SetBit functions. -=-=- ''Load, Next List!'' 
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| Wed, 21 Mar 2007, 18:03 | |
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Blitz3Dman
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Thanks, been wondering how I'd do something like that for a while. Did you write the code yourself or find it?
-=-=- There are 10 kinds of people in this world - ( Insert 16 remarks about to what extent people know hex here ) |
| Wed, 21 Mar 2007, 18:22 | |
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mike_g |
If you learn how bit shifting works then coding something like that is pretty straight forward. Shl shifts a bit left doubling its decimal value. Shr shifts right halving the value. As an example: you can take a binary true state (1) and shift it left 7 times so it becomes 128. to get the value back shift right 7 times and you will be left with 1. You can also cancel out any higher bit values by using the term 'And'. For example: This line of code shifts a 4 byte colour value right by 16 bits, then uses 'and' to ignore the high 8 bits reserved for Alpha information. This leaves you with the red component of the colour. |
| Thu, 22 Mar 2007, 05:07 | |
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Blitz3Dman
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I still haven't really learned how to use Shr and Shl. Probably ought to learn I suppose.
-=-=- There are 10 kinds of people in this world - ( Insert 16 remarks about to what extent people know hex here ) |
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