Finding the Number of Records in a File
User’s Guide 147
Finding the Number of Records in a File
The easiest way to determine the number of records in a file is to use a Verify
node with
Match set to a value you know is not in the file and the Store Index
in
Register checkbox selected (with a register specified for storing the index
value). Since it won’t find a match, the program will return the file size, storing
it in the index register.
Another method copies a known value to the end of the file, uses a
Verify node
to locate it, and then subtracts 1 from the
Location Index. Tip07.scr,
illustrated in
Figure 120, demonstrates this method.
Figure 120. Tip07.scr Determines the Number of Records in a File
Display:
RECORDS
Writes
RECORDS= on the portable’s screen.
2342.book Page 147 Thursday, July 22, 2004 8:35 AM
