Hi Arnaud,
Sorry, the sample code could have been more clear on that point.
I've changed the changeExifMetadata() method of
WriteExifMetadataExample like so:
>>>
// new import
import org.apache.sanselan.common.BinaryConstants;
...
public void changeExifMetadata(File jpegImageFile, File dst)
throws IOException, ImageReadException,
ImageWriteException
{
OutputStream os = null;
try
{
TiffOutputSet outputSet = null;
// note that metadata might be null if no metadata is
found.
IImageMetadata metadata =
Sanselan.getMetadata(jpegImageFile);
JpegImageMetadata jpegMetadata = (JpegImageMetadata)
metadata;
if (null != jpegMetadata)
{
// note that exif might be null if no Exif
metadata is found.
TiffImageMetadata exif = jpegMetadata.getExif();
if (null != exif)
{
// TiffImageMetadata class is immutable
(read-only).
// TiffOutputSet class represents the
Exif data to write.
//
// Usually, we want to update existing
Exif metadata by changing
// the values of a few fields, or
adding a field.
// In these cases, it is easiest to use
getOutputSet() to
// start with a "copy" of the fields
read from the image.
outputSet = exif.getOutputSet();
}
}
if(null==outputSet)
outputSet = new
TiffOutputSet(BinaryConstants.BYTE_ORDER_INTEL);
...
>>>
Simply put, if the image file doesn't contain any Exif metadata,
create a new instance of the TiffOutputSet data structure and use it
instead of one derived from old metadata.
I hope you find this helpful.
Charles.
I've cc'd the sanselan-dev mailing list again.
On Feb 2, 2008 9:23 AM, Arnaud Mondit <[EMAIL PROTECTED]> wrote:
> Hi, it's me again :)
>
> Your advices helped me a lot writing GPS metadata into jpeg files, but now
> I'm facing new problems.
>
> The software I'm writing takes picture files from a folder and then places
> them on a "google maps"-like map (using gps coordinates and the swingx-ws
> library), and also provides the ability to set gps coordinates to untagged
> pictures. That works quite well using your library with pictures that
> already have metadata, but not at all with picture that dont (those which
> Sanselan.getMetadata(picture) returns null).
>
> Is there any way to generate metadata (without informations) so that I could
> write GPS metadata in it and then write it back to the file ? I couldn't
> find any indications for that in your examples or in your code.
>
> Thanks again.
>
> Arnaud Mondit
>
