Question

我正在尝试合并此方法中的两个PDF，但在成功添加后，我无法将iTextSharp.text.Document转换为byte数组。请帮帮我。

protected byte[] MergePDFs(byte[] First, byte[] Second, string RptTitle)
{

    iTextSharp.text.Document doc = new iTextSharp.text.Document();
    iTextSharp.text.pdf.PdfReader reader = null;
    int numberOfPages = 0;
    int currentPageNumber = 0;
    iTextSharp.text.pdf.PdfWriter writer = iTextSharp.text.pdf.PdfWriter.GetInstance(doc, MemStream);
    doc.Open();
    iTextSharp.text.pdf.PdfContentByte cb = writer.DirectContent;
    iTextSharp.text.pdf.PdfImportedPage page = null;
    //Third, append all the PDFs--THIS IS THE MAGIC PART
    if (First != null)
    {
        reader = new iTextSharp.text.pdf.PdfReader(First);
        numberOfPages = reader.NumberOfPages;
        currentPageNumber = 0;
        while ((currentPageNumber < numberOfPages))
        {
            currentPageNumber += 1;
            doc.SetPageSize(iTextSharp.text.PageSize.A4);
            doc.NewPage();
            page = writer.GetImportedPage(reader, currentPageNumber);
            //we know that the page would always be in Potrait Format
            cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 1);

        }
    }

    if (Second != null)
    {
        reader = new iTextSharp.text.pdf.PdfReader(Second);
        numberOfPages = reader.NumberOfPages;
        currentPageNumber = 0;
        while ((currentPageNumber < numberOfPages))
        {
            currentPageNumber += 1;
            doc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());
            //.Rotate());
            doc.NewPage();
            page = writer.GetImportedPage(reader, currentPageNumber);
            //we know that the page would always be in LandScape Format
            //  cb.AddTemplate(page,0, -1f, 1f, 0,0, reader.GetPageSizeWithRotation(currentPageNumber).Height+300);
            cb.AddTemplate(page, 1, 0, 0, 1, 0, 0);
        }
    }

    doc.Close();
    byte[] cc = StringToByteArray(doc.ToString());
    return cc;

Answer 1

我不知道你们在哪里得到这些例子，他们完全错了。

首先，使用PdfCopy，而不是PdfWriter。这样就可以正确导入正确的页面大小和方向。

其次，如果您的MemStream是MemoryStream，则可以使用MemStream.ToArray()来获取PDF字节。

PS：doc.ToString()的发明来自哪里？这完全是垃圾。

如何将itextsharp文档转换为字节数组

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