不保持不可见的内容裁剪PDF（.NET或ObjC） [英] Crop PDF without keeping invisible content (.NET or ObjC)

问题描述

我想用.NET来裁剪PDF文件（使用PDF4NET或iTextSharp的，但没有关闭这些的）或Objective-C的（CGContextXXX，CGPDFXXX等）......但是，如果没有保持无形的内容！

I'm trying to crop a PDF using .NET (using PDF4NET or iTextSharp, but not closed to these ones) or Objective-C (CGContextXXX, CGPDFXXX, etc.)... But without keeping the invisible content !

目前，我能够使用裁剪框或剪辑区域做裁剪操作，但所有内容隐形仍是美元的的PDF p $ psent ...

Currently, I'm able to do the crop operation using the Crop Box or a Clip Region, but all content invisible is still present in the PDF...

这可能吗？

感谢（对不起，我是法国人......）

Thanks (and sorry, I'm french...)

推荐答案

您可以尝试的 Amyuni PDF创建的.Net 完成这个任务。你可以使用的方法<一href="http://amyuni.com/WebHelp/Amyuni_PDF_Creator_for_NET/Amyuni_PDFCreator_IacDocument/Methods/GetObjectsInRectangle_Method.htm"相对=nofollow> IacDocument.GetObjectsInRectangle 来检索所有的图形对象你的兴趣：

You could try Amyuni PDF Creator .Net for this task. You could use the method IacDocument.GetObjectsInRectangle to retrieve all the "graphic objects" of your interest:

IacDocument.GetObjectsInRectangle方法

IacDocument.GetObjectsInRectangle Method

该GetObjectsInRectangle方法获取所有处于该对象   指定的矩形。

The GetObjectsInRectangle method gets all the objects that are in the specified rectangle.

然后就可以遍历页面中所有对象，并删除那些你不感兴趣的：

Then you can iterate all the objects in the page and delete those that you are not interested in:

//open a pdf document
document.Open (testfile,"");
IacPage page1 = document.GetPage (1);
Amyuni.PDFCreator.IacAttribute attribute = page1.AttributeByName ("Objects");
// listobj is an array list of graphic objects
System.Collections.ArrayList listobj = (System.Collections.ArrayList) attribute.Value;
foreach ( object pdfObj in listobj )
{
   // if pdfObj is not in the collection of interest
   // then call pdfObj.Delete();
}

更新：
Amyuni PDF创建.NET版本5.0增加了一种新的方法<一href="https://www.amyuni.com/WebHelp/Amyuni_PDF_Creator_for_NET/Amyuni_PDFCreator_IacDocument/Methods/IacDocument.Redact_Method.htm"相对=nofollow> IacDocument.Redact 这也可能有助于在这种情况下的：

Update:
Amyuni PDF Creator .Net version 5.0 adds a new method IacDocument.Redact which might also be helpful in this kind of scenario:

本纂方法检索指定类型的所有对象   指定的矩形，删除它们，并绘制纯色   矩形在自己的位置。

The Redact method retrieves all the objects of the specified type in the specified rectangle, deletes them, and draws a solid color rectangle at their place.

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