使用iTextsharp将PDF拆分为多个PDF

Question

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;
        }

    }

我想将Pdf分成多个PDF,间隔为50页.(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.

Answer 1

每次推进页面时,您都会遍历pdf并创建新文档.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.像这样的东西:

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,每50页调用上面的方法.您只需在块中添加变量即可跟踪开始/结束页面.

Answer 2

这会有用的。非常符合你的要求

http://www.codeproject.com/Articles/559380/SplittingplusandplusMergingplusPdfplusFilesplusinp