如何使用iTextSharp確定PDF文件類型

Question

是否有方法可以確定PDF文件的類型：如果現有PDF文件是掃描圖像，還是使用iTextSharp和C＃從數據文件創建？

Answer 1

文檔屬性/高級/ PDF製作

Answer 2

也許你可以添加一些元數據，給您iTextSharp的創建PDF。

Read/Modify PDF Metadata using iTextSharp

Answer 3

我剛纔提出這個方法的PdfWriter對象的監視窗口中搜索合適的位置後，以取代PDF製作，它改變了PDF的「PDF造物主」，因爲它是不是默認訪問：

private static void ReplacePdfCreator(PdfWriter writer) 
    { 
     /* 

     Warning 
     * 
     This is not an option offered as is and i had to workaround it by using Reflection and change it 
     manually. 
     * 
     Alejandro 

     */ 
     Type writerType = writer.GetType(); 
     PropertyInfo writerProperty = 
      writerType.GetProperties(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance) 
         .FirstOrDefault(p => p.PropertyType == typeof(PdfDocument)); 

     if (writerProperty != null) 
     { 
      PdfDocument pd = (PdfDocument)writerProperty.GetValue(writer); 
      Type pdType = pd.GetType(); 
      FieldInfo infoProperty = 
       pdType.GetFields(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance) 
         .FirstOrDefault(p => p.Name == "info"); 

      if (infoProperty != null) 
      { 
       PdfDocument.PdfInfo pdfInfo = (PdfDocument.PdfInfo)infoProperty.GetValue(pd); 

       if (pdfInfo != null) 
       { 
        string creator = pdfInfo.GetAsString(new PdfName("Producer")).ToLowerInvariant(); 

     if(creator.Contains("itextsharp")) 
     { 
      // created with itext sharp 
     } 
     else if(creator.Contains("adobe")) 
     { 
      // created with adobe something (distiller, photoshop, whatever) 
     } 
     else if(creator.Contains("pdfpro")) 
     { 
      // created with pdf pro 
     } 
     else if(add your own comparison here, for example a scanner manufacturer software like HP's one) 
     { 
     } 
       } 
      } 
     } 
}