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：
- 初始化用于输入 EPS 文件的输入流。
- 从先前创建的输入流创建 PsDocument 实例。
- 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。
- 现在您可以添加元数据字段的属性了。
- 初始化用于输出 EPS 文件的输出流。
- 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}您可以从 GitHub下载示例和数据文件。