Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 120)

Operating Functions
Chapter 5
5–83
5.10.3.5
Find a String in a String – CALL 64
This routine finds a string within a string. It locates the first occurrence
(position) of this string. This call expects two input arguments . The first is
the string to be found, the second is the string to be searched for a match.
One return argument is required. If the number is not zero then a match
was located at the position indicated by the value of the return argument.
This routine is similar to the BASIC INSTR$(findstr$,str$). (Example:
L=INSTR$($(1),$(2))
u10 REM SAMPLE FIND STRING IN STRING ROUTINE
u20 STRING 1000,20
u30 $(1)=“456”
u40 $(2)=“12345678”
u50 PUSH 1 :REM STRING NUMBER OF STRING TO BE FOUND
u60 PUSH 2 :REM BASE STRING NUMBER
u70 CALL 64 :REM GET LOCATION OF FIRST CHARACTER
u80 POP L
u90 IF L=0 THEN PRINT “NOT FOUND”
u100 IF Lu0 THEN PRINT “FOUND AT LOCATION ”,L
u110 END
uRUN
FOUND AT LOCATION 4
READY
5.10.3
String Support Calls
(continued)