Release 10.1A: OpenEdge Development:
Progress 4GL Reference

GET-BYTE function

Returns the unsigned 1 byte value at the specified memory location as an INTEGER.

Syntax

GET-BYTE ( source , position )

source

A function or variable that returns a RAW or MEMPTR value. If source is the Unknown value (?), GET-BYTE returns the Unknown value (?).

position

An integer value greater than 0 that indicates the byte position where you want to find the information. If position is greater than the length of source, Progress returns the Unknown value (?). If position is less than 1, Progress generates a run-time error.

Examples

In this example, the RAW function goes to the customer field in the non-OpenEdge database. The GET-BYTE function accesses the first byte and stores the integer value of that byte in the variable i. The procedure then tests the value, if the integer value is 83 (the character code value for S), Progress displays the name.

r-rawget.p

/*You must connect to a non-PROGRESS database to run this procedure*/ DEFINE VARIABLE i AS INTEGER. FOR EACH customer: i = GET-BYTE(RAW(name),1). IF i = 83 THEN DISPLAY NAME. END.

The next procedure sets up a MEMPTR region with a character string and uses the GET-BYTE function to display the character code value of each character in the string.

r-mptget.p

DEFINE VARIABLE mptr AS MEMPTR. DEFINE VARIABLE cnt AS INTEGER. SET-SIZE(mptr) = LENGTH("DANIEL") + 1. PUT-STRING(mptr, 1) = "DANIEL". REPEAT cnt = 1 TO LENGTH("DANIEL"): DISPLAY GET-BYTE(mptr, cnt). END.

Notes

For more information on using the MEMPTR data type, see OpenEdge Development: Programming Interfaces .
For more information on using the RAW data type, see OpenEdge Development: Programming Interfaces .
You can use the alternative keyword GETBYTE instead of GET-BYTE.

See also

LENGTH function, PUT-BYTE statement, RAW function, RAW statement, SET-SIZE statement