Crash on selectInput() and loadStrings()?

Programming Questions

Phospheros

Crash on selectInput() and loadStrings()?

in Programming Questions • 1 year ago

I'm trying to load a saved preferences file which resets a number of parameters. It works beautifully when I select a valid file, but crashes pretty consistently (not all the time) if I abort the file-select process, or if I choose an invalid file.

I'm using P5 1.5.1, OSX 10.6.8.

The condensed code below reproduces the problem on my system. Can anyone else confirm this behavior? Spot the problem, suggest a fix?

TIA,

RA

int x = 0; int y;
void draw() { // Proxy draw stuff here for debugging feedback.
noStroke();
rect(0, 0, width, height);
stroke(0);
y = height/2;
ellipse(x, y, 4, 4);
x++;
x = x % width;
}
void keyPressed() {
// Load Preferences.
if (key == RETURN || key == ENTER) {
String getPrefs = selectInput();
if (getPrefs != null) {
String[] validatesPMT = match(getPrefs, "pmt_"); // Validate file prefix.
String[] validatesTXT = match(getPrefs, ".txt"); // Validate file suffix.
if (validatesPMT != null && validatesTXT != null) {
String[] readPrefs = loadStrings(getPrefs);
int foo = int(readPrefs[0]);
// array [etc.]
}
else println("Please make sure the file you are selecting begins with \"pmt_\" and ends with \".txt.\"");
}
else println("No file was selected.");
}
}

Replies(5)

PhiLho

Re: Crash on selectInput() and loadStrings()?

1 year ago

I cannot reproduce your problem with 1.5.1 and Windows 7.

Phospheros

Re: Crash on selectInput() and loadStrings()?

1 year ago

Thanks for taking a look at it.

Following up -- I'm pretty sure I had looked at this before, but now it seems as if I'm getting different behaviors depending on whether I use the mouse or the keyboard for interaction in the open dialogue. Currently I do not seem to be able to get it to fail using mouse and clicking on buttons or double-clicking on files.

Key interaction still fails frequently, especially using ESC to exit the dialogue, but also occasionally RETURN or ENTER to select and choose a non-valid file.

Is it possible there is some crosstalk or conflict with the key interaction, maybe between the sketch and the OS? Or am I just starting to get buggy-eyed and seeing things because I've been staring at it too long?

[Scurries off to search forum from a new angle...]

This unanswered question may or may not relate to my own. Still seeking illumination.

bilmor

Re: Crash on selectInput() and loadStrings()?

1 year ago

After a convoluted chase:

Under Processing 1.5.1 on MacOS X 10.7.4 I get the problem; the sketch freezes and pinwheels indefinitely.

The sketch fails to compile under Version 2.0b3, throwing an error on the SelectInput() call. The 2.0 docs are inconsistent on the usage, so I went to file a bug on the docs. Found that it was already in the system, indeed the 2.0 SelectInput() is radically different. Following is an excerpt from http://wiki.processing.org/w/Changes#Change_and_Removed :

The old versions have been removed because they were problematic.

Without specifying the problem. I'll bet you've hit that, so it is a Processing problem rather than anything in your code.

Bill

benja

Re: Crash on selectInput() and loadStrings()?

1 year ago

I couldn't reproduce the behaviour on osx 10.5.8, but i remember there were problems with selectInput(), when you call it inside of keyPressed().
But it could help to call noLoop() before and loop() after.

noLoop();
String getPrefs = selectInput();
loop();

Phospheros

Re: Crash on selectInput() and loadStrings()?

1 year ago

That's the ticket!

But I also had to escape the ESC, so as not to kill the program when canceling the dialog. Thus:

noLoop();
String getPrefs = selectInput();
if (key == ESC) key = 0;
loop();

Many thanks to all. Made my day!

Top Reply