BitMaskRead

Description

Performs a bitwise mask read operation.

Returns

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

Category

Mathematical functions

Function 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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