Processing 1.0 - Processing Discourse - createReader example fails

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Index › Suggestions & Bugs › Website, Documentation, Book Bugs › createReader example fails

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createReader example fails (Read 1989 times)

hgi0100

createReader example fails
Oct 21^st, 2008, 5:59pm

I have just upgraded to version 0152 and the createReader() example on the website fails with the following error "Unhandled Exception type IOException" - this is the code that generates the error, and the file positions.txt is in the right place etc. so it looks like it may be a bug in this version.

BufferedReader reader;

void setup() {
// Open the file from the createWriter() example
reader = createReader("positions.txt");
}

void draw() {
String line = reader.readLine();
if (line == null) {
// Nothing left in the file, stop reading.
noLoop();
} else {
String[] pieces = split(line, TAB);
int x = int(pieces[0]);
int y = int(pieces[1]);
point(x, y);
}
}

REAS

Re: createReader example fails
Reply #1 - Oct 21^st, 2008, 7:07pm

I was able to get it to work with this modification:

BufferedReader reader;
String line;

void setup() {
// Open the file from the createWriter() example
reader = createReader("positions.txt");
}

void draw() {

try {
line = reader.readLine();
}
catch (IOException e) {
// Print out the exception that occurred
System.out.println("Unable to read " + reader + ": "+e.getMessage());
}

if (line == null) {
// Nothing left in the file, stop reading.
noLoop();
}
else {
String[] pieces = split(line, TAB);
int x = int(pieces[0]);
int y = int(pieces[1]);
point(x, y);
}

}

I need to check with Ben regarding how it should be done "officially."

fry

Re: createReader example fails
Reply #2 - Oct 21^st, 2008, 7:08pm

That's just a typo in the example. Here's a better version:

Quote:

BufferedReader reader;
String line;

void setup() {
  // Open the file from the createWriter() example
  reader = createReader("positions.txt");
}

void draw() {
  try {
    line = reader.readLine();
  } catch (IOException e) {
    e.printStackTrace();
    line = null;
  }
  if (line == null) {
    // Nothing left in the file, stop reading.
    noLoop();
  } else {
    String[] pieces = split(line, TAB);
    int x = int(pieces[0]);
    int y = int(pieces[1]);
    point(x, y);
  }
}

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: createReader example fails Reply #3 - Oct 21^st, 2008, 7:10pm REAS wrote on Oct 21^st, 2008, 7:07pm: I need to check with Ben regarding how it should be done "officially." Ha, Casey's and I's posts collided. That's my official word. And the official word is in color.

REAS YaBB Moderator Offline Posts: 712 CA	Re: createReader example fails Reply #4 - Oct 21^st, 2008, 7:22pm Well, there's a first time for everything... and in COLOR. The example has been updated on the site, will be included in the next distribution, 154.

hgi0100 YaBB Newbies Offline Posts: 3	Re: createReader example fails Reply #5 - Oct 22^nd, 2008, 11:53am Thanks, everything works fine now, incidentally is there any way of setting up a common data directory which can be used by multiple sketches?

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: createReader example fails Reply #6 - Oct 23^rd, 2008, 10:45pm hgi0100, for most (or all) function taking a file name, you can specify a full path. Perhaps that can address your need.

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