在 EPS 的 XMP 元数据中添加属性 | C++

为了在 EPS 文件的 XMP 元数据中添加属性,需要执行以下步骤:

  1. 初始化用于输入 EPS 文件的输入流。
  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. 现在您可以添加元数据字段的属性了。
  5. 初始化用于输出 EPS 文件的输出流。
  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++ 中在 EPS 文件的 XMP 元数据中添加属性:

 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        
24        System::DateTime now = System::DateTime::get_UtcNow();
25        
26        // Add Integer poperty
27        xmp->Add(u"xmp:Intg1", System::MakeObject<XmpValue>(111));
28        
29        // Add DateTime poperty
30        xmp->Add(u"xmp:Date1", System::MakeObject<XmpValue>(now));
31        
32        // Add Double poperty
33        xmp->Add(u"xmp:Double1", System::MakeObject<XmpValue>(111.11));
34        
35        // Add String poperty
36        xmp->Add(u"xmp:String1", System::MakeObject<XmpValue>(u"ABC"));
37        
38        // Save EPS file with changed XMP metadata
39        
40        // Create ouput stream
41        System::SharedPtr<System::IO::FileStream> outPsStream = System::MakeObject<System::IO::FileStream>(RunExamples::GetOutDir() + u"add_simple_props_output.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
42        
43        // Save EPS file
44        
45        {
46            auto __finally_guard_1 = ::System::MakeScopeGuard([&outPsStream]()
47            {
48                outPsStream->Close();
49            });
50            
51            try
52            {
53                document->Save(outPsStream);
54                outPsStream->Flush();
55            }
56            catch (...)
57            {
58                throw;
59            }
60        }
61        
62    }
63    catch (...)
64    {
65        throw;
66    }
67}

请参阅在 Java.NET 中的 XMP 元数据中添加属性。

您可以从 GitHub下载示例和数据文件。

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