OK, you know how you can OR together bits like THIS | THAT | THEM in like a UINT or DWORD (might be anything, but those are the ones I see most often)? Well, what''s the technique used to extract the bits from the DWORD? Like if I wanted to create a file object that had four options, READ, WRITE, BINARY, APPEND. Say the person created a file with CreateFile(READ | WRITE | BINARY) meaning he wanted binary acess w/ read and write enabled. How would I extract the bits so I could tell what the programmer wants? Thx. ============================== "Need more eeenput..." - #5, "Short Circuit" ==============================

You have to use &. See?

  #define THIS 1#define THAT 2#define THEM 4// Is the THIS bit set...?result = (Value & THIS) ? true : false;   

Regards,
Jumpster

EDIT: Source Blocks didn't work. How about CODE blocks...

Edited by - Jumpster on November 12, 2000 9:51:10 AM

damnit! And i just wrote a program for it... DOH

I think im gonna post my program anyway!

#include #define WRITE	0x00000000000000000000000000000001#define READ	0x00000000000000000000000000000010#define BINARY	0x00000000000000000000000000000100#define	GURGEL	0x00000000000000000000000000001000int main(){	unsigned int flags;	flags=GURGEL;					//sets flag to GURGEL	flags=flags|READ|WRITE;			//keeps old flags and puts READ and WRITE on...		if(flags&WRITE) cout << "Write flag on" << endl;	if(flags&READ) cout << "Read flag on" << endl;	if(flags&BINARY) cout << "Binary flag on" << endl;	if(flags&GURGEL) cout << "Gurgel flag on" << endl;	return 0;} 

=======================
Game project(s):
www.fiend.cjb.net

cool - thanks!

==============================
"Need more eeenput..."

- #5, "Short Circuit"
==============================

Jonatan, you defined your constants as binary numbers, not hexidecimal

0x1
0x2
0x4
0x8
0x10
0x20
0x40
0x80
0x100
...
0x80000000

will use every bit available... don't need all those preceeding zeros either...

Edited by - Magmai Kai Holmlor on November 12, 2000 3:25:43 PM

And if you want to unset a bit, AND it with the inverse of the value.
e.g.

Flags &= ~VALUE;