Opening a text file

General Discussion Other

hector.lo..

in General Discussion • Other • 3 years ago

Hi!

This has to be an easy question, but I've trying to figure out for a long time and i just don't get anywhere. I'm trying to open a text file in my data folder, not to read it but to write something in it. I'm trying createWriter() but this function creates a file or overwrite the existing one.

How can I open and write on an existing text file?

Thank you!

Replies(8)

kooogy

Re: Opening a text file

3 years ago

i've not tried this but

standard java:
FileOutputStream(File file, boolean append)
Creates a file output stream to write to the file represented by the specified File object.

with append = true

then you can use the undocumented processing method:
createWriter(OutputStream stream)

http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/processing/core/PApplet.html#createWriter(java.io.OutputStream)

guy_yitzh..

Re: Opening a text file

3 years ago

This code works for me (as koogy wrote, the second parameter to FileWriter determines whether to append or overwrite):

try {
BufferedWriter writer = new BufferedWriter(new FileWriter(...somefilename..., true));
writer.write(...somedata...);
writer.flush();
writer.close();
} catch (IOException ioe) {
println("error: " + ioe);
}

hector.lo..

Re: Opening a text file

3 years ago

Ok, thank, ill be trying those.

The problem is that it'd be perfect for me to use the saveStrings() function, but i dont understand why it only can be used with an array of Strings and not with a unique String. Makes no sense to me.

I'll give feedback in a while!

hector

corpuscal..

Re: Opening a text file

1 year ago

Hey, I have not been able to get this working.

Any luck with this?

Thanks,

Jack

corpuscal..

Re: Opening a text file

1 year ago

Found out that my file was being saved, but for some reason by default into my Applications folder...

I guess the buffered writer does not automatically go into your data folder like I expected.

Jesse Sco..

Re: Opening a text file

1 year ago

Im just discovering this problem too... is there any way to tell it a file path relative to your .pde ??

My sketch will be a distributed application, so I don't want to hard code a path...

~ J

PhiLho

Re: Opening a text file

1 year ago

Use the sketchPath variable or the sketchPath(fileName) function or sketchFile(fileName) which already returns a File object.
Note that you can use createWriter() too...

Jesse Sco..

Re: Opening a text file

1 year ago

Yeah, I discovered dataPath() ... sorry, should have updated this. Thanks though!