cannot open a file for read (even with absolute pathname)

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fearless_..

cannot open a file for read (even with absolute pathname)

in Programming Questions • 1 year ago

I'm trying to read a data file using the following:

String filename = "/Users/myAccount/Processing/test_proj/data/lines.txt";
BufferedReader input = new BufferedReader(new FileReader(filename));

... but it's blowing up on new FileReader() with a FileNotFound exception. This particular file is .java (not .pde), so AFAIK the dataPath() function isn't available.

Any idea on the cause? Or the cure?

Replies(2)

PhiLho

Re: cannot open a file for read (even with absolute pathname)

1 year ago

" AFAIK the dataPath() function isn't available"
Unless you have a PApplet instance at hand. Otherwise, it is just a Java question...

Are you sure it throws the exception? Or perhaps it doesn't even compile and tells you need to catch this exception... ("Unhandled exception type FileNotFounException").
See try / catch.

fearless_..

Re: cannot open a file for read (even with absolute pathname)

1 year ago

Bingo. Yes, it was a compile time error telling me I needed a FileNotFound try/catch block. (Forgive me, I'm just returning from a long vacation in Rubyland and my Java chops have atrophied.)

And I also just found this tutorial:

http://processing.org/learning/eclipse/

which explained how to pass a reference to PApplet in order to get access to all Processing goodness in pure Java objects. That will go into the next rev. (Perhaps there's a little tutorial to write about how to mix .pde and .java code, though I'm not volunteering until (a) I have my current deadline behind me and (b) I understand Processing a little bit better.)

Thanks!

- ff

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