CODEWITHSUNDEEP
vb.netconstants
Mouhgouda
Mouhgouda

Reputation: 113

Constant with multiple values?

I've stumbled upon that particular bit of code and i'm a bit stumped as the usefulness of it. 

Public Const FILE_SHARE_READ as Integer = 1  
Public Const FILE_SHARE_WRITE as Integer = 2  
Public Const FILE_SHARE_DELETE as Integer = 4  
Public Const FILE_SHARE_ALL as Integer = FILE_SHARE_READ or FILE_SHARE_WRITE or FILE_SHARE_DELETE

i tested it a bit and haven't gotten any more insight than :
FILE_SHARE_ALL is always equal to 4 anyways.
Is there something i'm missing?

EDIT: Thanks for your help, i've found out the problem -> Code 18 Copy-paste mistake in my tester the line was 

Public Const FILE_SHARE_ALL as Integer = FILE_SHARE_DELETE or FILE_SHARE_DELETE or FILE_SHARE_DELETE

Don't judge me!

Upvotes: 0

Views: 384

Answers (1)

Zohar Peled
Zohar Peled

Reputation: 82474

Public Const FILE_SHARE_READ as Integer = 1  
Public Const FILE_SHARE_WRITE as Integer = 2  
Public Const FILE_SHARE_DELETE as Integer = 4  
Public Const FILE_SHARE_ALL as Integer = FILE_SHARE_READ or FILE_SHARE_WRITE or FILE_SHARE_DELETE

The Or here is a Bitwise or, meaning that the FILE_SHARE_ALL should result with 7, since:

int 1 ' = binary 001
int 2 ' = binary 010
int 4 ' = binary 100  

001 | 010 | 100 = 111 ' equals int 7.

Upvotes: 3

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