File size and deleting some content out of that...

Question

Dear All,
I have a log file...using FileWriter, I am updating that file...Once if the log file's content reaches certain limit(some 1000 lines), I want to delete the first 100 lines...how to do this...any suggestions/codes please...
bye & waiting for ur post,
Sakthivel S.

Answer 1

Guessing here, but (I guess) your program will write to the file quite a few times during its operation.
If you write a LogWriter class that you send the log entries to then when it reaches 1000 lines it will have to re-write then whole file, omitting the first line and appending the last line every time you add another log entry.
this would put a lot of strain on the file system and slow you program down a lot.
I would look for a different way to store and access the log data.
1 way is to store all the log file entires in a vector of strings and only write the file when you want to read it.
LogWriter would then only have to remove the first line and add the latest line, also when instructed write the vector to the log file.
Another way would be to just write all the data to the file, then when you want to read it you could read all the lines back (keeping only the last 1000 as per method 1) and then rewrite the file
dont worry too much about storing this "large" amont of data in avector, you should have plenty of memory for that