B4J Question Parse Image Meta Data

[oldeast]

any suggestions on how to read image title, copyright etc.
My code still throws an exception getMeta not matched
I looked at a previous post which showed a workaround but it does not work.
Appreciate any suggestions ..

Dim JO As JavaObject = Me
                    Dim rsmd As JavaObject =    JO.RunMethod("getMeta", Array ( val ) )
                    Log (rsmd)
                    
#if java
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.ResultSetMetaData;
 
 public ResultSetMetaData  getMeta(ResultSet val) throws SQLException {
    ResultSetMetaData rsmd = val.getMetaData();
    return rsmd;
  }
#End If

 

[Erel]

How is the sql API related to images?

 

[oldeast]

that was the only ref I could find to meta data so obviously barking up the wrong tree..
can you point me in the right direction please

 

[Daestrum]

You could try using this library from Apache commons-image-io-0.4.0.jar
It seems to be able to read most metadata from image files.

 

[oldeast]

Thank you will check it out.
Graham

 

[oldeast]

I must be doing something wrong as it is not accessible in the Libraries Manager

 

[DonManfred]

Did you wrote a wrapper for it?
If not then you need to use JavaObject to access it.

Accessing third party Jar with #Additionaljar and JavaObject - Picasso

The #AdditionalJar module attribute (introduced in B4A v3.80) allows us to reference external jars. With the help of JavaObject it is now possible to integrate third party jars without a wrapper. This solution is good for "simple" libraries. If the API is complicated with many interfaces then...

www.b4x.com

 

[oldeast]

Thank you will work on it.

 

[oldeast]

Tried I but can't understand how to use the Java Object to examine the image properties

 

[Daestrum]

This is the code I use to test it ( the java code isn't mine - I found it on the internet)

#Region Project Attributes 
    #MainFormWidth: 600
    #MainFormHeight: 600 
    #AdditionalJar: commons-image-io-0.4.0.jar
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    'MainForm.RootPane.LoadLayout("Layout1") 'Load the layout file.
    MainForm.Show
    asJO(Me).RunMethod("getMetadata",Array("C:/temp/powershot.jpg"))
End Sub

Sub asJO(o As JavaObject) As JavaObject
    Return o
End Sub
'Return true to allow the default exceptions handler to handle the uncaught exception.
Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
    Return True
End Sub
#if java
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.Sanselan;
import org.apache.sanselan.common.IImageMetadata;
import org.apache.sanselan.common.ImageMetadata.Item;
import org.apache.sanselan.common.RationalNumber;
import org.apache.sanselan.formats.jpeg.JpegImageMetadata;
import org.apache.sanselan.formats.tiff.TiffField;
import org.apache.sanselan.formats.tiff.TiffImageMetadata;
import org.apache.sanselan.formats.tiff.constants.ExifTagConstants;
import org.apache.sanselan.formats.tiff.constants.GPSTagConstants;
import org.apache.sanselan.formats.tiff.constants.TiffTagConstants;
import org.apache.sanselan.formats.tiff.constants.TagInfo;


    public static void getMetadata(String filename) throws ImageReadException,
        IOException {
    // get all metadata stored in EXIF format (ie. from JPEG or TIFF).
    File f = new File(filename);
    final IImageMetadata metadata =  Sanselan.getMetadata(f);


    // System.out.println(metadata);

    if (metadata instanceof JpegImageMetadata) {
        final JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;

        // Jpeg EXIF metadata is stored in a TIFF-based directory structure
        // and is identified with TIFF tags.
        // Here we look for the "x resolution" tag, but
        // we could just as easily search for any other tag.
        //
        // see the TiffConstants file for a list of TIFF tags.

        System.out.println("file: " + f.getPath());

        // print out various interesting EXIF tags.
        printTagValue(jpegMetadata, TiffTagConstants.TIFF_TAG_XRESOLUTION);
        printTagValue(jpegMetadata, TiffTagConstants.TIFF_TAG_DATE_TIME);
        printTagValue(jpegMetadata,
                ExifTagConstants.EXIF_TAG_DATE_TIME_ORIGINAL);
        //printTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_DATE_TIME_DIGITIZED);
        printTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_ISO);
        printTagValue(jpegMetadata,
                ExifTagConstants.EXIF_TAG_SHUTTER_SPEED_VALUE);
        printTagValue(jpegMetadata,
                ExifTagConstants.EXIF_TAG_APERTURE_VALUE);
        printTagValue(jpegMetadata,
                ExifTagConstants.EXIF_TAG_BRIGHTNESS_VALUE);
        printTagValue(jpegMetadata,
                GPSTagConstants.GPS_TAG_GPS_LATITUDE_REF);
        printTagValue(jpegMetadata, GPSTagConstants.GPS_TAG_GPS_LATITUDE);
        printTagValue(jpegMetadata,
                GPSTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
        printTagValue(jpegMetadata, GPSTagConstants.GPS_TAG_GPS_LONGITUDE);

        System.out.println();

        // simple interface to GPS data
        final TiffImageMetadata exifMetadata = jpegMetadata.getExif();
        if (null != exifMetadata) {
            final TiffImageMetadata.GPSInfo gpsInfo = exifMetadata.getGPS();
            if (null != gpsInfo) {
                final String gpsDescription = gpsInfo.toString();
                final double longitude = gpsInfo.getLongitudeAsDegreesEast();
                final double latitude = gpsInfo.getLatitudeAsDegreesNorth();

                System.out.println("    " + "GPS Description: "
                        + gpsDescription);
                System.out.println("    "
                        + "GPS Longitude (Degrees East): " + longitude);
                System.out.println("    "
                        + "GPS Latitude (Degrees North): " + latitude);
            }
        }

        // more specific example of how to manually access GPS values
        final TiffField gpsLatitudeRefField = jpegMetadata
                .findEXIFValueWithExactMatch(GPSTagConstants.GPS_TAG_GPS_LATITUDE_REF);
        final TiffField gpsLatitudeField = jpegMetadata
                .findEXIFValueWithExactMatch(GPSTagConstants.GPS_TAG_GPS_LATITUDE);
        final TiffField gpsLongitudeRefField = jpegMetadata
                .findEXIFValueWithExactMatch(GPSTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
        final TiffField gpsLongitudeField = jpegMetadata
                .findEXIFValueWithExactMatch(GPSTagConstants.GPS_TAG_GPS_LONGITUDE);
        if (gpsLatitudeRefField != null && gpsLatitudeField != null
                && gpsLongitudeRefField != null
                && gpsLongitudeField != null) {
            // all of these values are strings.
            final String gpsLatitudeRef = (String) gpsLatitudeRefField.getValue();
            final RationalNumber gpsLatitude[] = (RationalNumber[]) (gpsLatitudeField
                    .getValue());
            final String gpsLongitudeRef = (String) gpsLongitudeRefField
                    .getValue();
            final RationalNumber gpsLongitude[] = (RationalNumber[]) gpsLongitudeField
                    .getValue();

            final RationalNumber gpsLatitudeDegrees = gpsLatitude[0];
            final RationalNumber gpsLatitudeMinutes = gpsLatitude[1];
            final RationalNumber gpsLatitudeSeconds = gpsLatitude[2];

            final RationalNumber gpsLongitudeDegrees = gpsLongitude[0];
            final RationalNumber gpsLongitudeMinutes = gpsLongitude[1];
            final RationalNumber gpsLongitudeSeconds = gpsLongitude[2];

            // This will format the gps info like so:
            //
            // gpsLatitude: 8 degrees, 40 minutes, 42.2 seconds S
            // gpsLongitude: 115 degrees, 26 minutes, 21.8 seconds E

            System.out.println("    " + "GPS Latitude: "
                    + gpsLatitudeDegrees.toDisplayString() + " degrees, "
                    + gpsLatitudeMinutes.toDisplayString() + " minutes, "
                    + gpsLatitudeSeconds.toDisplayString() + " seconds "
                    + gpsLatitudeRef);
            System.out.println("    " + "GPS Longitude: "
                    + gpsLongitudeDegrees.toDisplayString() + " degrees, "
                    + gpsLongitudeMinutes.toDisplayString() + " minutes, "
                    + gpsLongitudeSeconds.toDisplayString() + " seconds "
                    + gpsLongitudeRef);

        }

        System.out.println();

        final List<Item> items = jpegMetadata.getItems();
        for (int i = 0; i < items.size(); i++) {
            final Item item = items.get(i);
            System.out.println("    " + "item: " + item);
        }

        System.out.println();
    }
    }

    private static void printTagValue(final JpegImageMetadata jpegMetadata,
          final TagInfo tagInfo) {
      final TiffField field = jpegMetadata.findEXIFValueWithExactMatch(tagInfo);
      if (field == null) {
          System.out.println(tagInfo.name + ": " + "Not Found.");
      } else {
          System.out.println(tagInfo.name + ": "
                + field.getValueDescription());
      }
    }
#End If

 

[oldeast]

Thank you..I think I can work with that.
Much appreciated
Graham

 

[Daestrum]

This page list the items it can find
TiffTagConstants

 

[oldeast]

Ok, I saw that the code after the GPS iterates through the other image properties so that list will be helpful.
Thanks for your assistance.

 

[oldeast]

I have modified the code Daestrum posted, removing the second example and selecting the tags I want using TiffTagConstants
I would like it to send the data to a table to show the data on a form.

System.out.println(tagInfo.name + ": " + field.getValueDescription());

Appreciate any assistance.

 

[Mark Read]

Here is an alternative for you using the metadata-extractor. This is app not finished yet but it may help you.

You will need to add the metadata-extractor-2.11.0.jar file to your libraries directory. The jar file can be downloaded here.

Regards

 

[oldeast]

Thank you very much!
Graham

 

[bdunkleysmith]

Thanks for your input @mark35at and the further support you provided by way of our conversation.

For the benefit of others who may find your code useful, but as in my case find it doesn't run of their machines, I thought I'd publish here the fix you directed me to in that

#AdditionalJar: xmpcore-5.1.3

had to be added and the attached jar added to the additional libraries folder.

 

[oldeast]

Thanks for your input @mark35at and the further support you provided by way of our conversation.

For the benefit of others who may find your code useful, but as in my case find it doesn't run of their machines, I thought I'd publish here the fix you directed me to in that

#AdditionalJar: xmpcore-5.1.3

had to be added and the attached jar added to the additional libraries folder.

 

[oldeast]

Thanks, it's WA day public holiday, so will work on it tomorrow.
Cheers
Graham