CLOSE will close any file that has been OPENed.
CLOSE[#file 1,#file 2,…..#file X]
Will close file numbers 4 and 5.
If CLOSE is specified with no parameters all files that have been OPENed are CLOSEd.
When the CLOSE command is executed, HUNTER’S firmware automatically performs a checksum generation on the file and stores the value in the file directory for checking the next time the file is opened.
Failure to CLOSE the file in the correct manner will result in a ‘no file’ error message when an attempt is made to OPEN the file at a later date.
When a file is closed, any data in the buffer not already written to the file will be saved. This means that there must be space available in the HUNTER for a file to be closed correctly. It is therefore recommended that the following method be used to ensure data integrity in all application programs where the above problem may arise.
10 OPEN "EXPAN.DTA" FOR OUTPUT AS 1 20 WRITE# #1,A:CLOSE
This reserves an area of memory in the disk space. Using ON ERROR to trap a “disk full” error, the handling routine could simply be:
1000 KILL"EXPAN.DTA" 1010 CLOSE
This ensures that there will always be enough room to close all files.