INTB real-valued function INTB real-valued function Syntax INTB ($string, first_char ) Function Return the value of two bytes of a string interpreted as a signed 16-bit binary integer. Parameters $string String expression that contains the two bytes to be converted. first_char Optional real-valued expression that specifies the position of the first of the two bytes in the string. If first_char is omitted or has a value of 0 or 1, the first two bytes of the string are extracted. If first_char is greater than 1, it is interpreted as the character position for the first byte. For example, a value of 2 means that the second byte contains bits 9 to 16 and the third byte contains bits 1 to 8.
An error is generated if first_char specifies a byte pair that is beyond the end of the input string. Details Two sequential bytes of a string are interpreted as being a 2's-complement 16-bit signed binary integer. The first byte contains bits 9 to 16, and the second byte contains bits 1 to 8. The main use of this function is to convert binary numbers from an input data record to values that can be used internally by eV+. The expression value = INTB($string, first_char) is equivalent to the following instruction sequence: value = ASC($string,first_char)*256 + ASC($string,first_char+1) IF value > 32767 THEN value = value-65536 END To compute an unsigned integer, use:
INTB($string) BAND ^HFFFF. Examples INTB($CHR(10)+$CHR(5)) ;Returns the value 2565 eV+Language Reference Guide, v2.x, 18319-000 Rev A Page 299