使用iTextsharp将PDF拆分为多个PDF [英] Split PDF into multiple PDFs using iTextsharp

问题描述

public int SplitAndSave(string inputPath, string outputPath)
    {
        FileInfo file = new FileInfo(inputPath);
        string name = file.Name.Substring(0, file.Name.LastIndexOf("."));

        using (PdfReader reader = new PdfReader(inputPath))
        {

            for (int pagenumber = 1; pagenumber <= reader.NumberOfPages; pagenumber++)
            {
                string filename = pagenumber.ToString() + ".pdf";

                Document document = new Document();
                PdfCopy copy = new PdfCopy(document, new FileStream(outputPath + "\\" + filename, FileMode.Create));

                document.Open();

                copy.AddPage(copy.GetImportedPage(reader, pagenumber));

                document.Close();
            }
            return reader.NumberOfPages;
        }

    }

我想拆分Pdf in到50页间隔的多个PDF。（如果有400页PDF，我想要8个pdf）。上面的代码将每个页面拆分为pdf。请帮帮我...我正在使用带有iTextSharp的asp.net。

I want to split the Pdf in to multiple PDFs with 50 pages interval.(Suppoose If there are 400 pages PDF, I want 8 pdfs). The above code is splitting every page into a pdf. Please help me...I'm using asp.net with iTextSharp.

推荐答案

你正在循环使用pdf并创建每次推进页面时都会出现一个新文档。您需要跟踪您的页面，以便每50页执行一次拆分。我个人会把它放在一个单独的方法中，并从你的循环中调用它。这样的事情：

You're looping through the pdf and creating a new document every time you advance a page. You'll need to keep track of your pages so that you perform split only every 50 pages. Personally I would put that in a separate method and call it from your loop. Something like this:

private void ExtractPages(string sourcePDFpath, string outputPDFpath, int startpage,  int endpage)
{
    PdfReader reader = null;
    Document sourceDocument = null;
    PdfCopy pdfCopyProvider = null;
    PdfImportedPage importedPage = null;

    reader = new PdfReader(sourcePDFpath);
    sourceDocument = new Document(reader.GetPageSizeWithRotation(startpage));
    pdfCopyProvider = new PdfCopy(sourceDocument, new System.IO.FileStream(outputPDFpath, System.IO.FileMode.Create));

    sourceDocument.Open();

    for (int i = startpage; i <= endpage; i++)
    {
        importedPage = pdfCopyProvider.GetImportedPage(reader, i);
        pdfCopyProvider.AddPage(importedPage);
    }
    sourceDocument.Close();
    reader.Close();
}

因此，在原始代码循环中通过pdf并且每50页调用以上内容方法。您只需在块中添加变量即可跟踪开始/结束页面。

So in your original code loop through your pdf and every 50 pages call the above method. You'll just need to add variables in your block to keep track of the start/end pages.

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