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BitMaskRead
Last update:
May 18, 2026
Description
Performs a bitwise mask read operation.
Returns
An integer, created from length bits of_ number,_ beginning at start.
Category
Function syntax
BitMaskRead(number, start, length) |
See also
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>
<p>BitMaskRead(255, 4, 4): <cfoutput>#BitMaskRead(255, 4, 4)#</cfoutput></p>
<p>BitMaskRead(255, 0, 4): <cfoutput>#BitMaskRead(255, 0, 4)#</cfoutput></p>
<p>BitMaskRead(128, 0, 7): <cfoutput>#BitMaskRead(128, 0, 7)#</cfoutput></p>Example
<cfscript>
number = 255 ;
start = 0 ;
length = 4;
writeOutput(bitmaskread(number, start, length)) ;
</cfscript>
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