Exiv2

Silke,

Can you turn your code snippets into a small reproducer program for this problem and post it here if the problem persists?

Andreas

Andreas,

Thanks for offering to have a look at my problem.

I am using exiv2 with VS2008 / WinXP.
To keep it simple I "exchanged" the source-code of your "xmpsample.cpp"
with the following lines of code.

int main(int argc, char* const argv[])
try {
if (argc != 2) {
std::cout << "Usage: " << argv⁰ << " file\n";
return 1;
} {
std::cout << "Caught Exiv2 exception '" << e << "'\n";
return -1;
}

std::string testFile = argv[1];

//Open File and write some XMP
  Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(testFile);
  assert(image.get() != 0);

Exiv2::XmpData xmpDataW;
  Exiv2::XmpProperties::registerNs("R&S/", "RS");
  xmpDataW["Xmp.RS.SerialNumber"] = "12345678";
  xmpDataW["Xmp.RS.SoftwareVersion"] = "9.9.9.9";

image->setXmpData(xmpDataW);
  image->writeMetadata();
  image.release();

Exiv2::Image::AutoPtr imageOpenSameFileAgain = Exiv2::ImageFactory::open(testFile);
  assert(imageOpenSameFileAgain.get() != 0);
  imageOpenSameFileAgain->readMetadata();

Exiv2::XmpData &xmpDataR = imageOpenSameFileAgain->xmpData();
  if (xmpDataR.empty()) 
  {
    std::string error(argv[1]);
    error += ": No XMP data found in the file";
    throw Exiv2::Error(1, error);
  }
  else
  {
    Exiv2::XmpData::const_iterator pos = xmpDataR.findKey(Exiv2::XmpKey("Xmp.RS.SoftwareVersion"));
    if (pos == xmpDataR.end()) 
    {
      std::string error(argv[1]);
      error += ": SoftwareVersion not found in XMP data of the file";
      throw Exiv2::Error(1, error);
    }

Exiv2::Value::AutoPtr v = pos->getValue();
    assert(v->ok());
    std::string sXMPValue = v->toString();
    std::cout << sXMPValue << "\n";
  }

return 0;
}
catch (Exiv2::AnyError& e)

and still get the same error I encountered in my own project
"writeMetadata" seems to work fine, but opening the same file
again and trying "readMetadata" results in an XMP_Error!

see attached files

Silke

sorry, the formatting somehow scrambled my little programm code, that i posted just a minute ago.
I try adding the source code file instead

Silke

That's a nice reproducer. I actually expected the issue would go away when I asked for it because I couldn't reproduce it with your initial information and the exiv2 tool. But now with the sample program, I also get an XMP parsing error.
The relevant difference to your initial post is the namespace URI: with MyCompany/ it works fine! The XMP toolkit doesn't like the ampersand (&) in your URI, "R&S/". Interestingly, replacing "&" with "&" also works but generates an Exiv2 warning. (That warning looks like a bug.)

Andreas

Interestingly, replacing "&" with "&" also works

and this confuses Redmine too. I wrote

replacing "&" with "&"

Andreas

Hi Andreas,

Thanks for the fast reply!
My little program works fine, once I got rid of the "&" in my URI :-)

As it is with software development, I immediately stumbled across my next problem:-)
In the "real world" my serialnumber contains non ASCII-characters ( Utf-8 coding ),
which is why i wanted to use XMP as I read that unicode strings are possible with XMP.

Unfortunately I quickly found out that writing unicode values to XMP its not as easy as

Exiv2::XmpData xmpDataW;
xmpDataW["Xmp.RS.SerialNumber"] = "12345678-ä";

Searching the forums for a while I didn't find any thread about this topic.
Maybe you have some little code snippets that show how to set a unicode string as value for a XMP property?

Cheers
Silke

Unfortunately I quickly found out that writing unicode values to XMP its not as easy as

Exiv2::XmpData xmpDataW;
xmpDataW["Xmp.RS.SerialNumber"] = "12345678-ä";

It shouldn't be much more difficult. Create an std::string s with your UTF encoded text and assign it to the property

std::string s = makeUtfEncodedText();
xmpDataW["Xmp.RS.SerialNumber"] = s;

Andreas