Change simple values in XMP EPS metadata |C++

In order to change simple values in XMP metadata of EPS file it is necessary to do several steps:

1. Initialize an input stream for input EPS file.
2. Create an instance of PsDocument from created earlier input stream.
3. Get an instance of XmpMetadata from the PsDocument. If given EPS file doesn’t contain XMP metadata the new one will be created, filled in with values from PS metadata comments and returned to you.
4. Now you can change values of metadata fields.
5. Initialize an output stream for output EPS file.
6. Save EPS file with changed XMP metadata.

Following code snippet shows how to change simple values in XMP metadata of EPS file in C++:

// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
// The path to the documents directory.
System::String dataDir = RunExamples::GetDataDir_WorkingWithXMPMetadataInEPS();
// Initialize EPS file input stream
System::SharedPtr<System::IO::FileStream> psStream = System::MakeObject<System::IO::FileStream>(dataDir + u"get_input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
// Create PsDocument instance from stream
System::SharedPtr<PsDocument> document = System::MakeObject<PsDocument>(psStream);


{
    auto __finally_guard_0 = ::System::MakeScopeGuard([&psStream]()
    {
        psStream->Close();
    });
    
    try
    {
        // Get XMP metadata. If EPS file doesn't contain XMP metadata we get new one filled with values from PS metadata comments (%%Creator, %%CreateDate, %%Title etc)
        System::SharedPtr<XmpMetadata> xmp = document->GetXmpMetadata();
        
        //Change XMP metadata values
        
        
        // Change ModifyDate value
        System::DateTime now = System::DateTime::get_UtcNow();
        xmp->idx_set(u"xmp:ModifyDate", XmpValue::to_XmpValue(now));
        
        // Change Creator value
        System::SharedPtr<XmpValue> value = System::MakeObject<XmpValue>(u"Aspose.Page");
        xmp->Add(u"dc:creator", value);
        
        // Change Title value
        value = System::MakeObject<XmpValue>(u"(PAGEJAVA-29.eps)");
        xmp->Add(u"dc:title", value);
        
        // Save EPS file with changed XMP metadata
        
        // Create ouput stream
        System::SharedPtr<System::IO::FileStream> outPsStream = System::MakeObject<System::IO::FileStream>(RunExamples::GetOutDir() + u"change_values_output.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
        
        // Save EPS file
        
        {
            auto __finally_guard_1 = ::System::MakeScopeGuard([&outPsStream]()
            {
                outPsStream->Close();
            });
            
            try
            {
                document->Save(outPsStream);
                outPsStream->Flush();
            }
            catch (...)
            {
                throw;
            }
        }
        
    }
    catch (...)
    {
        throw;
    }
}

See changing simple values in XMP metadata in Java and .NET.

You can download examples and data files from GitHub.