更改 EPS 的 XMP 元数据中的数组项 | C++

要更改 EPS 文件的 XMP 元数据中的数组项,需要执行以下步骤:

  1. 为输入 EPS 文件初始化输入流。
  2. 从先前创建的输入流创建 PsDocument 实例。
  3. 从 PsDocument 获取 XmpMetadata 实例。如果给定的 EPS 文件不包含 XMP 元数据,则将创建新的实例,并使用 PS 元数据注释中的值填充该实例并返回给您。
  4. 现在您可以更改数组元数据字段中的项。
  5. 为输出 EPS 文件初始化输出流。
  6. 保存包含更改后的 XMP 元数据的 EPS 文件。


以下代码片段展示了如何在 C++ 中更改 EPS 文件中 XMP 元数据的数组项:

 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        // Change title item at index 0
24        xmp->SetArrayItem(u"dc:title", 0, System::MakeObject<XmpValue>(u"NewTitle"));
25        
26        // Change creator item at index 0
27        xmp->SetArrayItem(u"dc:creator", 0, System::MakeObject<XmpValue>(u"NewCreator"));
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"change_array_items_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}

请参阅 Java.NET 中 XMP 元数据中数组项的更改。

您可以从 GitHub下载示例和数据文件。

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