Last updated on
Apr 27, 2021 05:39:21 AM GMT
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Also Applies to ColdFusion
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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