如何将PDF文档拆分成小文档 [英] How to split PDF document into small ones

问题描述

我需要将一个文档拆分成几个小文档.例如，如果文档有 7 页，我需要生成 7 个 pdf.

在 iTextSharp 中，我使用了以下代码，效果很好.然而，在 iText 7 中不可能以同样的方式做到这一点.

iTextSharp 旧代码

var reader = new PdfReader(src);for (int i = 1; i <= reader.NumberOfPages; i++){var 文档 = 新文档();var copy = new PdfCopy(document, new FileStream(result + i + ".pdf", FileMode.Create));文档.Open();copy.AddPage(copy.GetImportedPage(reader, i));文档.关闭();}

iText 7，但不工作

第一个问题
我发现有 PdfSplitter，它可以将我的 pdf 分成小 pdf.然而，即使我的测试 pdf 也有 7 页，甚至 GetNumberOfPages() 返回数字 7，拆分文档的数量只是一个.

在这个链接文档 以某种方式显示了如何拆分文档.但是，我不知道如何制作与上述方法类似的方法 - getNextPdfWriter

第二个问题
即使我有一个文件，它是空的.我想知道如何设置合适的作者来创建正确的 pdf.分别是如何设置reader来读取分割文档的内容.

string result = outputPath + @"/page00";使用 (pdfDocument = new PdfDocument(new PdfReader(pdfPath))){var splitter = new PdfSplitter(pdfDocument);var splittedDocs = splitter.SplitByPageCount(pdfDocument.GetNumberOfPages());for (int i = 0; i < pdfDocument.GetNumberOfPages(); i++){//如何设置阅读器读取拆分文档的内容.或者如何为拆分文档设置作者.var pdfDoc = new PdfDocument(new PdfWriter(new FileStream(result + i + ".pdf", FileMode.Create)));pdfDoc.Close();splittedDocs[i].Close();}}

问题

<块引用>

如何使用 iText 7 在 .NET Core 中正确地将文档拆分为小文档

解决方案

嗯，这很容易.根据链接的文档，我做了以下事情:

创建自定义拆分器覆盖 PdfSplitter 的功能.

class CustomSplitter : PdfSplitter{私人 int _order;私有只读字符串_destinationFolder；公共 CustomSplitter(PdfDocument pdfDocument, string destinationFolder) : base(pdfDocument){_destinationFolder = 目标文件夹；_order = 0;}受保护的覆盖 PdfWriter GetNextPdfWriter(PageRange documentPageRange){return new PdfWriter(_destinationFolder + "splitDocument1_" + _order++ + ".pdf");}}

然后只需将其用于拆分 PDF 文档即可.不要忘记关闭拆分的文档.我想指出一件事.SplitByPageCount - 根据需要拆分的数量.SplitByPageCount(1) 将 PDF 文档拆分为一页.我真的误解了这个方法.

using (var pdfDoc = new PdfDocument(new PdfReader("doc.pdf"))){var outputDir = @C:";var splitter = new CustomSplitter(pdfDoc, outputDir);var splittedDocs = splitter.SplitByPageCount(1);foreach(splittedDocs 中的 var splittedDoc){splittedDoc.Close();}}

结果是几个 pdf.

I need to split a document into several small documents. For example, if document has 7 pages I need to generate 7 pdfs.

In iTextSharp i was using the following code, works pretty well. However, in iText 7 its not possible to do it in the same way.

iTextSharp old code

var reader = new PdfReader(src);
for (int i = 1; i <= reader.NumberOfPages; i++)
{
    var document = new Document();
    var copy = new PdfCopy(document, new FileStream(result + i + ".pdf", FileMode.Create));
    document.Open();
    copy.AddPage(copy.GetImportedPage(reader, i));
    document.Close();
}

iText 7, but not working

First problem
I have found that there is PdfSplitter, wich could split my pdf into small pdfs. However, even my testing pdf has 7 pages and even GetNumberOfPages() returns number 7, number of splitted document is just one.

In this linked documenation is somehow shown how to split document. However, I have no idea how to make similiar method to the one mentioned - getNextPdfWriter

Second problem
Even I have one file, its empty. I am wondering how to set proper writer to create correct pdf. Respectively, how to set reader in order to read the content of splitted document.

string result = outputPath + @"/page00";
using (pdfDocument = new PdfDocument(new PdfReader(pdfPath)))
{

    var splitter = new PdfSplitter(pdfDocument);
    var splittedDocs = splitter.SplitByPageCount(pdfDocument.GetNumberOfPages());

    for (int i = 0; i < pdfDocument.GetNumberOfPages(); i++)
    {
        //how to set reader to read the content of splitted docs. Or how to set writer for splitted doc.
        var pdfDoc = new PdfDocument(new PdfWriter(new FileStream(result + i + ".pdf", FileMode.Create)));
        pdfDoc.Close();
        splittedDocs[i].Close();
    }
}

Question

How to properly split document into small ones in .NET core with iText 7

解决方案

Well, it was quite easy. According to linked documentation I did the following:

Create custom splitter overriding functionality of PdfSplitter.

class CustomSplitter : PdfSplitter
{
      private int _order;
      private readonly string _destinationFolder;
    
      public CustomSplitter(PdfDocument pdfDocument, string destinationFolder) : base(pdfDocument)
      {
          _destinationFolder = destinationFolder;
          _order = 0;
      }
    
      protected override PdfWriter GetNextPdfWriter(PageRange documentPageRange)
      {
           return new PdfWriter(_destinationFolder + "splitDocument1_" +  _order++ + ".pdf");
      }
}

Then just use it for splitting a PDF document. Dont forget to close splitted document. And I would like to point out one thing. SplitByPageCount - it takes number according to wich should be splitted. SplitByPageCount(1) split a PDF document by one page. I trully misunderstood this method.

using (var pdfDoc = new PdfDocument(new PdfReader("doc.pdf")))
{
     var outputDir = @"C:";
     var splitter = new CustomSplitter(pdfDoc, outputDir);
     var splittedDocs = splitter.SplitByPageCount(1);

     foreach (var splittedDoc in splittedDocs)
     {
         splittedDoc.Close();
     }
}

The result is a few pdfs.

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