Data Type: Numeric or String
A string or numeric expression that evaluates between 0 and 255.
expression converted to a type of
expression to a Byte data
type. The Byte type is the smallest data storage device in VBScript.
Being only one byte in length, it can store unsigned numbers between
0 and 255.
expression is a string, the
string must be capable of being treated as a number.
expression evaluates to less
than 0 or more than 255, an overflow error is generated.
expression isn’t a whole
number, CByte rounds the number prior to
If IsNumeric(sMyNumber) Then If val(sMyNumber) >= 0 and val(sMyNumber) <= 255 Then BytMyNumber = Cbyte(sMyNumber) End If End If
Check that the value you pass to CByte is neither negative nor greater than 255.
Use IsNumeric to insure the value passed to CByte can be converted to a numeric expression.
When using CByte to convert floating-point numbers, fractional values up to but not including 0.5 are rounded down, while values greater than 0.5 are rounded up. Values of 0.5 are rounded to the nearest even number (i.e., they use the Banker’s Rounding Algorithm).