Catching image failure is not working (try/catch)

Processing Beginners
1

This doesnt work!

void setup() {
   try {
      image = loadImage("image.png");
   } catch (Exception e) {
      image = loadImage("error.png");
   }
}
1 Like
2

Hi @Aryszin,

I would recommend, before you’re posting things like this, to always consider to read the manuals, resp. references about. It clearly descibes on how to do error checking in several ways…

Cheers
— mnse

PS: to give a sneak preview… loadImage doesn’t throw exceptions… :wink:

3 Likes
3

void setup() {
image = loadImage(“image.png”);
if (image==null) {
image = loadImage(“error.png”);
}
}

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4

According to loadImage()'s reference, besides null, negative dimensions might also happen to indicate failure.

So if we need to be absolutely sure, we gotta check them as well, not just null:

PImage image;

void setup() {
  size(600, 600);
  noLoop();

  image = loadImage("image.png");

  if (!isValidImage(image))
    image = loadImage("https://CDN-Icons-png.FlatIcon.com/512/2731/2731804.png");

  println(image.width, image.height);
}

void draw() {
  background(0);
  set(width - image.width >> 1, height - image.height >> 1, image);
}

static final boolean isValidImage(final PImage img) {
  return img != null && img.width > 0 && img.height > 0;
}
4 Likes
5

im sorry i didnt really know that

1 Like