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Index › Programming Questions & Help › Syntax Questions › writing data to file

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writing data to file (Read 520 times)

jazz

writing data to file
Feb 21^st, 2010, 10:19pm

i am writing a programm that logs something over a longer period of time. at least some hours or even a day.
when using printwriter the data is sometimes lost when i close the program from the IDE. it seems like i have to use flush() and close()
is there another way to continously write to a file without the possibiltie of losing the data when the program quits.

or can i just use flush() every frame ?
if i still use the printwiter. does it collect all the data in memory before its written to file? cause wouldnt that mean it could be too much when running for a long time ?

PhiLho

Re: writing data to file
Reply #1 - Feb 21^st, 2010, 11:03pm

You guessed, just use flush().
To answer your last question, yes, data is bufferized in memory between flush calls (but I bet that when the buffer is filled, it is flushed automatically). That is to reduce disk accesses, which are slow. That's the classical dilemma between speed and security.
Note: you can also use the stop method to close properly your file.

jazz Ex Member	Re: writing data to file Reply #2 - Feb 21^st, 2010, 11:12pm alright, good to know. i just wanted to be sure that it doesnt crash when not using flush. so maybe i just flush it once every minute to be sure to save it ,not to lose any data. Thanks!

jazz Ex Member	Re: writing data to file Reply #3 - Feb 21^st, 2010, 11:15pm as you suggested it gets flushed when the buffer is full. i guess. so thats probably the reason why the files where i logged only less data werent saved, but the ones where i logged a lot of data always got saved. i guess because they were flushed by themself... thanks again.

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