Processing 1.0 - Processing Discourse - Continuosly write in a txt file

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Index › Programming Questions & Help › Syntax Questions › Continuosly write in a txt file

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Continuosly write in a txt file (Read 1275 times)

M1KES

Continuosly write in a txt file
Jan 16^th, 2010, 7:02pm

Hello!
~I would like to know if there is a way of processing continously writing in a txt file even after you close the program.. i am tryin to make a program that saves the name, present date and time of the user and would like to store it for later use.
The only examples i could find would overwrite what was previously stored.
Is there a simple way of doing this?

Any help would br greatly apreceated!

phling

Re: Continuosly write in a txt file
Reply #1 - Jan 16^th, 2010, 7:44pm

maybe there are better ways, but this works:

Quote:

void writeLog()
{

String newLine = "the app was launched on "+year()+"/"+month()+"/"+day()+" at "+hour()+":"+minute()+":"+second();
String logLines[] = loadStrings("log.txt");
if(logLines != null)
{
logLines = append(logLines, newLine);
}
else
{
logLines = new String[1];
logLines[0] = newLine;
}
saveStrings("log.txt", logLines);
}

-try to load Strings from a file "log.txt" from the sketch/data folder
-if data exists, append the new line containing date etc..
-if not, make a fresh String[]
-overwrite the old file (or create a new one)

Cedric YaBB Moderator Offline Posts: 1838	Re: Continuosly write in a txt file Reply #2 - Jan 17^th, 2010, 1:20am just use the search, there have been several posts about this topic http://processing.org/discourse/yabb2/?num=1262894607
	twitter.com/CedricKiefer

PhiLho

Re: Continuosly write in a txt file
Reply #3 - Jan 17^th, 2010, 2:48am

phling's way can work but might be overkill if the log grows large! (some logs can be several MB).
Cedric pointed to threads where we show how to open a file in append mode.
But if you have serious needs, you might want to look at a real logger, like log4j, optimized for this usage, able to change log file when the last one is too big, etc.

M1KES

Re: Continuosly write in a txt file
Reply #4 - Jan 17^th, 2010, 12:15pm

Thank you so much for the response from all of you! You have been all great help. Sorry for the late response but my internet got cut for a while.

phling thank you so much for the code, it works perfectly. You were really a great help.
Cedric i did the search and found that exact topic and for some reason i thought the topic creator was asking something else... sorry it was a misunderstanding.
PhiLho thx for the heads up, but the log file wont be ued to many times so i dont think it will get affected.. but thx for directing this to my attention. If i ever need it larger i will use your post as reference.

thank you again for all your help!

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