我想知道字节数组的用法

[powerword]

private sub bintofile(sfilename as string,fld as adodb.field)

dim bbuffer() as byte
dim nlenleft as long
dim schunksize as long

'remove any existing destination file

if len(dir$(sfilename))>0 then
kill sfilename
end if

're-create a new field
open sfilename for binary as #1

'use a 32k initial chuck size
nchunksize = 32768
nlenleft = fld.actulsize
if nlenleft<nchunksize then
nchunksize = nlenleft
end if
'retrieve the binary data in chunks
do
redim bbuffer(nchunksize-1)
bbufer=fld.getchunk(nchunksize) ///这一句对吗？
///bbufer=bbufer+fld.getchunk(nchunksize)
///字节数组有那些操作？请告知
nlenleft=nlenleft-nchunksize
if nlenleft<nchunsize then
nchunksize = nlenleft
end if
loop until nlenleft<=0
'write the data to the file
put #1,,bbuffer
close #1
end sub