Big numbers (again) and complex routine
Big numbers (again) and complex routine
- Subject: Big numbers (again) and complex routine
- From: julifos <email@hidden>
- Date: Fri, 07 Mar 2003 12:16:12 +0100
Hi!
I must work with big amounts of data, and I'm having some problems with
read-dowhatever routine:
file_ref is file opened for access
"starting_at" uses to be 1
The problem is with fEoF (eof of file opened for access). If we are talking
about a 800MB file, it will throw an error "can't make fEoF into an
integer".
###########################
repeat with x from starting_at to fEoF by 20000
try
set z to (read file_ref for 20000 from x)
--> do whatever
on error
set z to (read file_ref from x to fEoF)
--> do whatever
exit repeat
end try
end repeat
###########################
So I thought I could make several chunks able to be considered as integers
for large files:
###########################
set times_ to 0
if class of feof is not integer then
set times_ to 100
set div_ to feof div 100 as integer --> eg, 7854421
set mod_ to feof mod 100 as integer --> eg, 69
end if
set start_at_temp to starting_at
repeat with factor_ from 1 to times_
set stop_at to div_ * factor_
if factor_ = times_ then set stop_at to stop_at + mod_
repeat with x from start_at_temp to stop_at by 20000
try
set z to (read file_ref for 20000 from x)
--> do whatever
on error
set z to (read file_ref from x to stop_at)
--> do whatever
exit repeat
end try
end repeat
set start_at_temp to start_at_temp + stop_at
end repeat
###########################
I've tried this and other variations but I keep getting errors, errors,
errors...
Help!
JJ
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