Aspose.Pdf使用教程：获取PDF文件中的所有附件

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。
下载Aspose.Pdf试用版https://www.evget.com/product/565

下面是获取PDF文件中的所有附件的代码片段

//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使用教程：获取PDF文件中的所有附件

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