Problems modifiing field data

Question

I am having a problem using SetProperty to modify fields in a multipage pdf file.
First i use xmpMeta.DumpObject ( DumpCallback, sLogFile );
to dump the existing data to a terminal window.
At first run this works fine and i get the existing value set in the Category field of the "Categories" Panel.
Next i use xmpMeta.SetProperty ( kXMP_NS_Photoshop, "Category", "2" );
to change the value of a field and then call xmpFile.PutXMP ( xmpMeta ); to save the file.
When i open the file again in my test application the data is empty when doing the dump to the terminal window.
If I open it in acrobat, however, the data is there. I am some how corrrupting the data when wrtiting it. Can anyone help quide me as to what I may be doing wrong?
here is a sample of my code:
static void EditProperties ( const char * fileName )
bool ok;
SXMPMeta xmpMeta;
SXMPFiles xmpFile;
XMP_FileFormat format;
XMP_OptionBits openFlags, handlerFlags;
XMP_PacketInfo xmpPacket;
xmpFile.OpenFile ( fileName, kXMP_UnknownFile, kXMPFiles_OpenForUpdate );
ok = xmpFile.GetFileInfo ( 0, &openFlags, &format, &handlerFlags );
if ( ! ok ) return;
ok = xmpFile.GetXMP ( &xmpMeta, 0, &xmpPacket );
if ( ! ok ) return;
// Remove extaneous properties to make the dump smaller.
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/camera-raw-settings/1.0/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/tiff/1.0/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/exif/1.0/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/exif/1.0/aux/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/pdf/1.3/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/xap/1.0/t/pg/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, kXMP_NS_XMP, "Thumbnails", true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://purl.org/dc/elements/1.1/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/xap/1.0/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/xap/1.0/mm/", 0, true );
SXMPUtils::RemoveProperties ( &xmpMeta, "http://ns.adobe.com/pdfx/1.3/", 0, true );
//dump the data
fprintf ( sLogFile, "\n:::::::::: Initial XMP from %s ::::::::::\n\n", fileName );
xmpMeta.DumpObject ( DumpCallback, sLogFile );
//change the properties
xmpMeta.SetProperty ( kXMP_NS_Photoshop, "Category", "2" );
//dump it again
fprintf ( sLogFile, "\n\n:::::::::: Modified XMP from %s ::::::::::\n\n", fileName );
xmpMeta.DumpObject ( DumpCallback, sLogFile );
xmpFile.PutXMP ( xmpMeta );
xmpFile.CloseFile();

Answer 1

Are any of you going to the Adobe Developer Conference scheduled to be held for plugin providers at San Jose on Nov 7/8?