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freefile
freefile ( )

returns integer_expression

BASIC256 allows for multiple files to be opened at a single time. The freefile function returns a free open_file_number that you can use in your next Open or Openb. Once a file is closed, freefile will return that open_file_number to the list of available file numbers and may reissue that number.

# copy one binary file to another
k = 0
source = freefile
openb source,"file.pdf"
dest = freefile
openb dest,"file_copy.pdf"
reset dest
while not eof(source)
   writebyte dest, readbyte(source)
   k++
end while
close dest
close source
print k + " bytes copied."