CFML Reference
ColdFusion Functions

BitMaskRead

Description

Performs a bitwise mask read operation.

Return value

An integer, created from length bits of number, beginning at start.

Category

Mathematical functions

Syntax

BitMaskRead(number, start, length)

See also

BitMaskClear, BitMaskSet

Parameters

Parameter	Description
number	32-bit signed integer to mask
start	Integer, in the range 0-31, inclusive; start bit for read
length	Integer, in the range 0-31, inclusive; length of mask

Usage

Bit functions operate on 32-bit signed integers, in the range -2147483648 - 2147483647.

Example

<h3>BitMaskRead Example</h3>
<p>Returns integer created from <em>length</em> bits of <em>number</em>, beginning
with <em>start</em>.

<p>BitMaskRead(255, 4, 4): <cfoutput>#BitMaskRead(255, 4, 4)#
</cfoutput>
<p>BitMaskRead(255, 0, 4): <cfoutput>#BitMaskRead(255, 0, 4)#
</cfoutput>
<p>BitMaskRead(128, 0, 7): <cfoutput>#BitMaskRead(128, 0, 7)#
</cfoutput>

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