Re: [msvc] [personal] What is the next flag value I need to use?

Truckle, Andrew J Thu, 05 Jan 2006 23:38:44 -0800

Title: Message

Thank you for this detailed response and I will indeed try and locate a good resource on this subject. I think it has been suggested before to maintain a resources page for the group. Never seemed to happen.

Andrew

-----Original Message-----
From: Adam Peterson [mailto:[EMAIL PROTECTED]
Sent: 05 January 2006 16:59
To: Truckle, Andrew J
Subject: Re: [personal] [msvc] What is the next flag value I need to use?

I would second what Jason told you, but I'll expand a little bit. They are using binary flags so each position in the binary number indicates a different flag. A character is 1 byte or 8 bits, so had 8 values as flags as follows:

00000001

00000010

00000100

00001000

00010000

00100000

01000000

10000000

So if all 8 flags were set it would look like this:

11111111

if only 3 flags were set it might look like this:

00101101

Notice we are looking at a binary representation. Nobody likes to do that so they normally use decimal or hex so the above 10 examples would be:

00000001 = dec 1 = hex 1

00000010 = dec 2 = hex 2

00000100 = dec 4 = hex 4

00001000 = dec 8 = hex 8

00010000 = dec 16 = hex 10

00100000 = dec 32 = hex 20

01000000 = dec 64 = hex 40

10000000 = dec 128 = hex 80

11111111 = dec 255 = hex FF

00101101 = dec 45 = hex 2D

Since they prepend their digits with 0x, that tells you they are using hex so a hex 100 in binary is:

100000000

so the next value would be:

1000000000

which is hex 200.

Thus your next value should be 0x00000200

Again, I would second Jason's recommendation of looking up hex numbering and bitmasks. They aren't that complicated.

Good luck,

Adam

----- Original Message -----

From: Truckle, Andrew J

To: msvc@beginthread.com

Sent: Thursday, January 05, 2006 2:47 AM

Subject: [personal] [msvc] What is the next flag value I need to use?

        enum CheckFlags
        {
                checkZDifference      = 0x00000001,
                checkElevation        = 0x00000002,
                checkLooseEnd         = 0x00000004,
                checkShortSegment     = 0x00000008,
                checkDuplicateSegment = 0x00000010,
                checkIntersect        = 0x00000020,
                checkADS_NTZ          = 0x00000040,
                checkWater            = 0x00000080,
                checkTopology         = 0x00000100
        };

Is it 0x00002000 ??

I don't fully understand it…

Thanks..

Andrew Truckle
CAD Manager
Atkins Survey and Mapping
Avon Way, Langley Park, Chippenham, Wiltshire. SN15 1GG
Telephone:     01249 455032
Switchboard: 01249 455000
Fax:             01249 455045
E-Mail: [EMAIL PROTECTED]
www.atkinsglobal.com

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