C#如何在将大型pdf文件拆分为多个小型pdf文件时写入页码

时间:2018-08-14 05:47:33

标签: c# pdf itext

我有许多大型pdf文件,其中包含许多页面。我必须将那些较大的pdf拆分为多个小的pdf文件。

我有一个代码,可用于将大型pdf拆分为多个小的pdf文件。 下面的代码,我用于拆分。

private void SplitAndSaveInterval(string pdfFilePath, string outputPath, int startPage, int interval, string pdfFileName)  
{
    using (PdfReader reader = new PdfReader(pdfFilePath))  
    {  
        Document document = new Document();  
        PdfCopy copy = new PdfCopy(document, new FileStream(outputPath + "\\" + pdfFileName + ".pdf", FileMode.Create));  
        document.Open();  

        for (int pagenumber = startPage; pagenumber < (startPage + interval); pagenumber++)  
        {  
            if (reader.NumberOfPages >= pagenumber)  
            {  
                copy.AddPage(copy.GetImportedPage(reader, pagenumber));  
            }  
            else  
            {  
                break;  
            }  
        }  

        document.Close();  
    }  
} 

此代码取自https://www.c-sharpcorner.com/article/splitting-pdf-file-in-c-sharp-using-itextsharp/

我有一个添加页码的例程。例行程序:

void AddPageNumber(string fileIn, string fileOut)
{
    byte[] bytes = File.ReadAllBytes(fileIn);
    Font blackFont = FontFactory.GetFont("Arial", 12, Font.NORMAL, BaseColor.BLACK);
    using (MemoryStream stream = new MemoryStream())
    {
        PdfReader reader = new PdfReader(bytes);
        using (PdfStamper stamper = new PdfStamper(reader, stream))
        {
            int pages = reader.NumberOfPages;
            for (int i = 1; i <= pages; i++)
            {
                ColumnText.ShowTextAligned(stamper.GetUnderContent(i), Element.ALIGN_RIGHT, new Phrase(i.ToString(), blackFont), 568f, 15f, 0);
            }
        }
        bytes = stream.ToArray();
    }
    File.WriteAllBytes(fileOut, bytes);
}

现在我的问题是如何从SplitAndSaveInterval()例程中合并或调用AddPageNumber()例程,以最终在新生成的pdf文件的右上部分的每一页上添加页码。

寻求帮助和建议。谢谢

1 个答案:

答案 0 :(得分:0)

您似乎在使用iTextSharp,是否尝试过他们的文档中的以下内容:

public void onEndPage(PdfWriter writer, Document document) {
Rectangle rect = writer.getBoxSize("art");
switch(writer.getPageNumber() % 2) {
case 0:
    ColumnText.showTextAligned(writer.getDirectContent(),
        Element.ALIGN_RIGHT, header[0],
        rect.getRight(), rect.getTop(), 0);
    break;
case 1:
    ColumnText.showTextAligned(writer.getDirectContent(),
        Element.ALIGN_LEFT, header[1],
        rect.getLeft(), rect.getTop(), 0);
    break;
}
ColumnText.showTextAligned(writer.getDirectContent(),
    Element.ALIGN_CENTER, new Phrase(String.format("page %d", pagenumber)),
    (rect.getLeft() + rect.getRight()) / 2, rect.getBottom() - 18, 0);
}

https://developers.itextpdf.com/question/how-add-text-left-and-right-header