Add XML namespace in XMP metadata of EPS |C++

In order to add XML namespace 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 add new XML namespace to metadata.
  5. Initialize an output stream for output EPS file.
  6. Save EPS file with changed XMP metadata.


Following code snippet shows how to add XML namespace in XMP metadata in EPS file in C++:

 1// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
 2// The path to the documents directory.
 3System::String dataDir = RunExamples::GetDataDir_WorkingWithXMPMetadataInEPS();
 4// Initialize EPS file input stream
 5System::SharedPtr<System::IO::FileStream> psStream = System::MakeObject<System::IO::FileStream>(dataDir + u"add_simple_props_input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
 6// Create PsDocument instance from stream
 7System::SharedPtr<PsDocument> document = System::MakeObject<PsDocument>(psStream);
 8
 9
10{
11    auto __finally_guard_0 = ::System::MakeScopeGuard([&psStream]()
12    {
13        psStream->Close();
14    });
15    
16    try
17    {
18        // 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)
19        System::SharedPtr<XmpMetadata> xmp = document->GetXmpMetadata();
20        
21        //Change XMP metadata values
22        
23        // Add new XML namespace "tmp".
24        xmp->RegisterNamespaceUri(u"tmp", u"http://www.some.org/schema/tmp#");
25        
26        // Add new string property in new namespace.
27        xmp->Add(u"tmp:newKey", System::MakeObject<XmpValue>(u"NewValue"));
28        
29        // Save EPS file with changed XMP metadata
30        
31        // Create ouput stream
32        System::SharedPtr<System::IO::FileStream> outPsStream = System::MakeObject<System::IO::FileStream>(RunExamples::GetOutDir() + u"add_namespace_output.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
33        
34        // Save EPS file
35        
36        {
37            auto __finally_guard_1 = ::System::MakeScopeGuard([&outPsStream]()
38            {
39                outPsStream->Close();
40            });
41            
42            try
43            {
44                document->Save(outPsStream);
45                outPsStream->Flush();
46            }
47            catch (...)
48            {
49                throw;
50            }
51        }
52        
53    }
54    catch (...)
55    {
56        throw;
57    }
58}

See adding XMl namespace in XMP metadata in Java and .NET.

You can download examples and data files from GitHub.

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