Aspose.Pdf使用教程：获取PDF文件中的所有附件

小灰灰 2023-10-12 22:48 18阅读 0赞

**[Aspose.PDF][]** 是一款高级PDF处理API，可以在跨平台应用程序中轻松生成，修改，转换，呈现，保护和打印文档。无需使用Adobe Acrobat。此外，API提供压缩选项，表创建和处理，图形和图像功能，广泛的超链接功能，图章和水印任务，扩展的安全控件和自定义字体处理。本文将为你介绍如何在 C++ 中将PDF转换为Doc 、Docx 。

要从PDF文件中获取所有附件,需要查看文档对象的EmbeddedFiles集合。EmbeddedFiles集合包含所有的附件。这个集合的每个元素代表一个FileSpecification对象。 每个EmbeddedFiles集合的循环计数器迭代将会返回一个FileSpecification对象。一旦这个对象是可用的,您可以检索附件的所有属性或附件本身。  
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下面是获取PDF文件中的所有附件的代码片段

**C\#**

>     //open document
>     Document pdfDocument = new Document("input.pdf");
>     //get embedded files collection
>     EmbeddedFileCollection embeddedFiles = pdfDocument.EmbeddedFiles;
>     //get count of the embedded files
>     Console.WriteLine("Total files : {0}", embeddedFiles.Count);
>     //loop through the collection to get all the attachments
>     foreach (FileSpecification fileSpecification in embeddedFiles)
>     {
>     Console.WriteLine("Name: {0}", fileSpecification.Name);
>     Console.WriteLine("Description: {0}", 
>     fileSpecification.Description);
>     Console.WriteLine("Mime Type: {0}", fileSpecification.MIMEType);
>     //check if parameter object contains the parameters
>     if (fileSpecification.Params  != null)
>     {
>       Console.WriteLine("CheckSum: {0}", 
>       fileSpecification.Params.CheckSum);
>       Console.WriteLine("Creation Date: {0}", 
>       fileSpecification.Params.CreationDate);
>       Console.WriteLine("Modification Date: {0}", 
>       fileSpecification.Params.ModDate);
>       Console.WriteLine("Size: {0}", fileSpecification.Params.Size);
>     }
>     //get the attachment and write to file or stream
>     byte[] fileContent = new byte[fileSpecification.Contents.Length];
>     fileSpecification.Contents.Read(fileContent, 0, 
>     fileContent.Length);
>     FileStream fileStream = new FileStream(fileSpecification.Name, 
>     FileMode.Create);
>     fileStream.Write(fileContent, 0, fileContent.Length);
>     fileStream.Close();
>     }

**VB.NET**

>     'open document
>     Dim pdfDocument As New Document("input.pdf")
>     'get embedded files collection
>     Dim embeddedFiles As EmbeddedFileCollection = pdfDocument.EmbeddedFiles
>     'get count of the embedded files
>     Console.WriteLine("Total files : {0}", embeddedFiles.Count)
>     'loop through the collection to get all the attachments
>     For Each fileSpecification As FileSpecification In embeddedFiles
>     Console.WriteLine("Name: {0}", fileSpecification.Name)
>     Console.WriteLine("Description: {0}", 
>     fileSpecification.Description)
>     Console.WriteLine("Mime Type: {0}", fileSpecification.MIMEType)
>     'check if parameter object contains the parameters
>     If fileSpecification.Params IsNot Nothing Then
>       Console.WriteLine("CheckSum: {0}", 
>       fileSpecification.Params.CheckSum)
>       Console.WriteLine("Creation Date: {0}", 
>       fileSpecification.Params.CreationDate)
>       Console.WriteLine("Modification Date: {0}", 
>       fileSpecification.Params.ModDate)
>       Console.WriteLine("Size: {0}", fileSpecification.Params.Size)
>     End If
>     'get the attachment and write to file or stream
>     Dim fileContent(fileSpecification.Contents.Length - 1) As Byte
>     fileSpecification.Contents.Read(fileContent, 0, 
>     fileContent.Length)
>     Dim fileStream As New FileStream(fileSpecification.Name, 
>     FileMode.Create)
>     fileStream.Write(fileContent, 0, fileContent.Length)
>     fileStream.Close()
>     Next fileSpecification

[Aspose.PDF]: https://www.evget.com/product/4118
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[Aspose.Pdf_icon-default.png_t_N5K3_icon-default.png_t_N5K3_https_www.evget.com_product_565]: https://www.evget.com/product/565