Question

我有一个PDF，在一个页面上有一个插件控件。我需要将它与另一个pdf合并，但是当我这样做时，插件被重新压缩为一个空白矩形。有没有办法合并并保留插件控件？如果重要，该插件是从http://www.3ds.com/products/3dvia/3dvia-composer/resource-center/安装的Dessault Systemes 3D Via Composer Player控件

我正在使用的代码是简单的编写器getinstance，contentbyte directcontent，getimportedpage，addtemplate。没什么好看的。

FileStream docStream = new FileStream(@"C:\Temp\Merged.pdf", FileMode.Create);
            Document newDocument = new Document(PageSize.A4.Rotate());
            PdfWriter pdfWriter = PdfWriter.GetInstance(newDocument, docStream);
        try
        {
            newDocument.Open();
            PdfContentByte pdfContentByte = pdfWriter.DirectContent;

            newDocument.NewPage();
            PdfReader mainPage = new PdfReader(@"C:\Temp\PageWithPlugin.pdf");
            PdfImportedPage importedPage1 = pdfWriter.GetImportedPage(mainPage, 1);
            pdfContentByte.AddTemplate(importedPage1, 0, 0);
            mainPage.Close();

            PdfReader smgPages = new PdfReader(@"C:\Temp\MorePages.pdf");
            for (int page = 1; page <= smgPage.NumberOfPages; page++)
            {
                newDocument.NewPage();
                PdfImportedPage importedPage = pdfWriter.GetImportedPage(smgPages, page);
                pdfContentByte.AddTemplate(importedPage, 0, 0);
            }
            smgPages.Close();

            }
        finally
        {
            docStream.Flush();
            if (newDocument != null)
                newDocument.Close();
            docStream.Close();
        }

Answer 1

试一试。

List<byte[]> fileList = new List<byte[]>();

using (FileStream fileSteam = File.OpenRead((@"C:\Temp\PageWithPlugin.pdf")))
{
     Byte[] byteArray = new byte[fileSteam.Length];
     fileSteam.Read(byteArray, 0, byteArray.Length);

     fileList.Add(byteArray);
}

using (FileStream fileSteam = File.OpenRead((@"C:\Temp\MorePages.pdf")))
{
     Byte[] byteArray = new byte[fileSteam.Length];
     fileSteam.Read(byteArray, 0, byteArray.Length);

     fileList.Add(byteArray);
}

using(MemoryStream msOutput = new MemoryStream())
{
     PdfReader pdfFile = new PdfReader(fileList[0]);
     Document doc = new Document();
     PdfWriter pCopy = new PdfSmartCopy(doc, msOutput);

     doc.Open();

     for (int k = 0; k < fileList.Count; k++)
     {
         for (int i = 1; i < pdfFile.NumberOfPages + 1; i++)
         {
             pdfFile = new PdfReader(fileList[k]);
             ((PdfSmartCopy)pCopy).AddPage(pCopy.GetImportedPage(pdfFile, i));
             pCopy.FreeReader(pdfFile);
         }
     }

     pdfFile.Close();
     pCopy.Close();
     doc.Close();
     fileList.Clear();

     byte[] form = msOutput.ToArray();

     using (FileStream fileSteam = new FileStream(@"C:\Temp\Merged.pdf", FileMode.Create))
     {
          fileStream.Write(form, 0, form.Length);
     }
}

Answer 2

不要在口中看到礼物马但是......如果其他人使用该解决方案，则k循环存在一个小问题。在第一个文档之后，numberofpages将被一个文档关闭，并且pdfReader不断被释放并重新读取每个页面，这是不必要的。我认为这是对代码部分的改进：

using (MemoryStream msOutput = new MemoryStream())
            {
                Document doc = new Document();
                PdfWriter pCopy = new PdfCopy(doc, msOutput);
                doc.Open();
                for (int k = 0; k < fileList.Count; k++)
                {
                    PdfReader pdfFile = new PdfReader(fileList[k]);                        
                    for (int i = 1; i < pdfFile.NumberOfPages + 1; i++)
                    {
                        ((PdfCopy)pCopy).AddPage(pCopy.GetImportedPage(pdfFile, i));
                    }
                    pCopy.FreeReader(pdfFile);
                    pdfFile.Close();
                }
                pCopy.Close();
                doc.Close();
                fileList.Clear();

iTextSharp合并并保留插件

2 个答案: