FileSpecification對象能提供包括名稱、描述、MIMEType和參數(shù)在內(nèi)的附件屬性信息。前三個屬性從他們的名字可以很明顯地看出他們的作用,而參數(shù)屬性提供了有關(guān)文件的參數(shù)信息。這些參數(shù)包括校驗(yàn),創(chuàng)建日期,審核日期和大小。為了獲得這些參數(shù),首先需要確保Params參數(shù)屬性不為空。

你可以從Document文件對象的EmbeddedFiles Collection集合中獲取FileSpecification對象。 這個EmbeddedFiles集合包含PDF文檔的所有附件。

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獲取附件信息的代碼示例如下：

C#

//open document
Document pdfDocument = new Document("input.pdf");
//get particular embedded file
FileSpecification fileSpecification = pdfDocument.EmbeddedFiles[1];
//get the file properties
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);
}
 

'open document
Dim pdfDocument As New Document("input.pdf")
'get particular embedded file
Dim fileSpecification As FileSpecification = pdfDocument.EmbeddedFiles(1)
'get the file properties
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