Metadata-extractor

Processing Libraries
1

hi

looking to read exif data & found:

which led to metadata-extractor.

https://drewnoakes.com/code/exif/

I appear to be able to import the jar after setting it up in the Processing library, but then it fails at basic commands

// lots of metadata-extractor import statements here…

File jpegFile;
Metadata metadata;

void setup() {
  size(960,640);
  
  jpegFile = new File("test_DSC2894.jpg");
  metadata = ImageMetadataReader.readMetadata(jpegFile);
}

‘Unhandled exception type ImageProcessingException’

any thoughts?

thanks

Mark

1 Like
2

Hmm. Example on repo homepage is to load a path, not a File object-- although both may be valid.

Search the repo for ImageProcessingException. My guess is that you need to add a try / catch around your read to catch that exception, even if you do nothing but quit().

https://processing.org/reference/try.html

3

hi

thanks for trying …

but get same error from try / catch

File jpegFile;
Metadata metadata;

void setup() {
  size(960,640);
  jpegFile = new File("test_DSC2894.jpg");
  try {
    metadata = ImageMetadataReader.readMetadata(jpegFile);
  } catch (IOException e) {
    e.printStackTrace();
  }
}
4

No, don’t catch IOException. Catch ImageProcessingException. The one that the error is saying is unhandled. Handle that one. And / or check where the handing is failing, so that your wrapping location is correct.

1 Like
5

thanks for reply

I’d tried that it gives error

‘Unhandled exception type IOException’

does this shed ant further light?

6

Every time you get an unhandled, you add a catch (except).

Unhandled Foo

try {
} except (Foo e) {
}

Unhandled Bar

try {
} except (Foo e) {
} except (Bar e) {
}

Unhandled Baz

try {
} except (Foo e) {
} except (Bar e) {
} except (Baz e) {
}

If an error asks you to handle an exception, handle the exception.

1 Like
7

hi
got it working
needs path + two exceptions

below is proof of concept which dumps all exif etc to console

thanks for assist

Mark

// above this all metadata-extractor import stuff
File jpegFile;
Metadata metadata;

void setup() {
  size(960,640);
  jpegFile = new File("Documents/Proc3/exif_test2/test_DSC2894.jpg");
  try {
    metadata = ImageMetadataReader.readMetadata(jpegFile);
    println(metadata, "Using ImageMetadataReader");
    
    for (Directory directory : metadata.getDirectories()) {
      for (Tag tag : directory.getTags()) {
        System.out.println(tag);
      }
    }
  } catch (ImageProcessingException e) {
    println(e);
  } catch (IOException e) {
  print(e);
  }
}
1 Like