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Question:

CkoXmp Can't find XMP data created by Photoshop CC 2014

Mar 14 '15 at 16:15

• Downloaded Chilkat for iOS
• Took photo on my phone, saved to desktop
• Opened photo in PS CC 2014 (on mac)
• Edited file info, adding values to most all fields
• Save file (Emailed it to support)
• loaded using below code
• Use the PS created jpg/xmp file, and CkoXmp can't find "Iptc4xmpCore:CreatorContactInfo" "Iptc4xmpCore:CiTelWork"
• Use the Chilkat sample jpg and it finds the Iptc4xmpCore:CiTelWork property

Looking at XML extracted using CkoXmp, it's clear that PS CC 2014 is saving the contact info struct as (had to edit it a bit to make it show in this message)

< Iptc4xmpCore:CreatorContactInfo Iptc4xmpCore:CiAdrExtadr="IPTCAddress"
 Iptc4xmpCore:CiAdrCity="IPTCCity" Iptc4xmpCore:CiAdrRegion="IPTCState" 
Iptc4xmpCore:CiAdrPcode="IPTCPostalCode" Iptc4xmpCore:CiAdrCtry="IPTCCountry"
 Iptc4xmpCore:CiTelWork="IPTCPhones&#xD;Phones2"
 Iptc4xmpCore:CiEmailWork="IPTCEmail&#xD;email2" 
Iptc4xmpCore:CiUrlWork="IPTCWebsites&#xD;websites2" / >

• Can CkoXmp read XMP data generated by Photoshop?

• Sample Code:

   (void) testChikkatGetStructValue
  {
      CkoXmp *xmp = [[CkoXmp alloc] init];
  
  NSString *jpgXMPFName = [self filepathWithFilename:@"Sample1-PsXMP.jpg"];
     jpgXMPFName = [self filepathWithFilename:@"Chilkat-sample1.jpg"];
  BOOL success;
  success = [xmp UnlockComponent: @"Anything for 30-day trial."];
  if (success != YES) {
      NSLog(@"%@",xmp.LastErrorText);
      return;
  }
  success = [xmp LoadAppFile:jpgXMPFName];
  if (success != YES) {
      NSLog(@"%@",xmp.LastErrorText);
      return;
  }
  NSLog(@"Extracting XMP from %@", jpgXMPFName);
  NSLog(@" %@%d",@"Num embedded XMP docs: ",[xmp.NumEmbedded intValue]);
  CkoXml *xml = 0;
  xml = [xmp GetEmbedded: [NSNumber numberWithInt: 0]];
  if (xml == nil) {
      NSLog(@"%@",xmp.LastErrorText);
      return;
  } else {
  // Log some values from the jpg's xmp data
  
  NSString *xmlParseLog = [self filepathWithFilename:@"xmlLog.txt"];
  xmp.VerboseLogging = YES;
  xml.VerboseLogging = YES;
  xml.DebugLogFilePath = xmlParseLog;
  
  NSString *propVal;
  propVal = [xmp GetStructValue: xml structName: @"Iptc4xmpCore:CreatorContactInfo" propName: @"Iptc4xmpCore:CiTelWork"];
  if (propVal == nil ) {
      NSLog(@"%@",@" property Not found.");
      NSLog(@"TEXT={{{%@}}}", xmp.LastErrorText);
  }
  else {
      NSLog(@"%@",propVal);
  }
  
  }
  }
  

---

Answer

I'll have a look as soon as possible -- but it may not be until late Monday or Tuesday. I have a feeling it has to do with this (from the XMP specification)

NOTE Many XMP processors use a more concise notation for structure values as described in
7.9.2.3, “rdf:parseType="Resource" attribute”.

PS> The XMP API conceptually offers two things:

1. The ability to extract XMP from JPG's and TIFF's, and the ability to add/modify XMP's to JPG's and TIFF's.
2. A set of convenience methods to simplify the read/write/modify of XMP data. However, XMP is just a specific application of XML. Th XMP for reading/writing/modifying XMP docs are just higher-level wrappers that essentially use Chilkat XML internally. Anything not provided directly via the XMP API can be accomplished with the lower-level Chilkat XML API.