如何使用iTextSharp确定PDF文件类型

Question

是否有方法可以确定PDF文件的类型：如果现有PDF文件是扫描图像，还是使用iTextSharp和C＃从数据文件创建？

Answer 1

文档属性/高级/ PDF制作

Answer 2

也许你可以添加一些元数据，给您iTextSharp的创建PDF。

Read/Modify PDF Metadata using iTextSharp

Answer 3

我刚才提出这个方法的PdfWriter对象的监视窗口中搜索合适的位置后，以取代PDF制作，它改变了PDF的“PDF造物主”，因为它是不是默认访问：

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) 
     { 
     } 
       } 
      } 
     } 
}