Saving a String, loading the text file and saving more informations to it?

Programming Questions

shumizu

Saving a String, loading the text file and saving more informations to it?

in Programming Questions • 2 years ago

Hi

Well, title explains it basicly.
For instance, the loaded file is sth like:

40 50
60 34
60 34
60 34

then i load this file and wanna save it again with new values, should look like this:

40 50
60 34
45 68
60 34
60 34

.. but it just saves 3 lines and delets the old ones.

Theres the code so far:

PrintWriter output;
String[] loadInfos;
void setup(){
size(300,300);
loadInfos = loadStrings("old.txt");
}
void draw(){
background(255);
}
void keyPressed(){
if(key == 's') {
String[] wo = loadInfos;
output = createWriter("old.txt");
for(int i = 0; i < wo.length; i++){
print(wo[i] + "\n" + mouseX + "\t" + mouseY+ "\n");
String words = (wo[i] + "\n" + mouseX + "\t" + mouseY+ "\n");
//String[] words = {wo[i]};
output.print(words);
output.flush(); // Writes the remaining data to the file
output.close();
}
//wo = wo + "\n" + mouseX + "\t" + mouseY;
//saveStrings("old.txt", wo);
}
}

thx
cheers

Replies(1)

david.bou..

Re: Saving a String, loading the text file and saving more informations to it?

2 years ago

1) move output.close() out of the body of the loop

2) not sure if this is what you want, but you might to update "loadInfos" on every keypress -- otherwise you just add to the ones you loaded in the beginning over and over, eg: put "loadInfos = wo;" at the end of keyPressed()... Then again maybe that's not what you want :)

Be careful that loadStrings() will try to use the data folder at first, and createWriter will not. This can get mixed up if old.txt ends up in the data folder.

d.