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。