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我用这个方法来合并现有的PDF文件,并添加新的PDF文件,它(在内存中没有物理的) 问题我有合并的PDF 2内存流一个又一个新的文档,然后将其转换为字节数组,我想这些Concat的拖阵列如何连接两个字节数组
public static byte[] merge(List<String> pdf)
{
MemoryStream copystream;
MemoryStream ms;
using (ms = new MemoryStream())
{
Document document;
using (document = new Document())
{
using (PdfWriter wri = PdfWriter.GetInstance(document, ms))
{
wri.CloseStream = false;
document.Open();
document.SetPageSize(iTextSharp.text.PageSize.A4); // for vertical layout
document.Add(new Paragraph("Hello"));
document.Close();
copystream = new MemoryStream();
Document doc = new Document();
using (PdfCopy copy = new PdfCopy(doc, copystream))
{
copy.CloseStream = false;
copy.Open();
doc.Open();
// copy.AddPage(PageSize.A4, 0);
for (int i = 0; i < pdf.Count; ++i)
{
PdfReader reader = new PdfReader(pdf[i]);
// loop over the pages in that document
int n = reader.NumberOfPages;
for (int page = 0; page < n;)
{
copy.AddPage(copy.GetImportedPage(reader, ++page));
}
}
copy.Close();
copystream.CopyToAsync(ms);
copystream.Close();
}
}
}
byte[] mergedPdf2 = copystream.ToArray();
byte[] mergedPdf3 = ms.ToArray();
byte[] result = new byte[mergedPdf2.Length + mergedPdf3.Length];
mergedPdf2.CopyTo(result, 0);
mergedPdf3.CopyTo(result, mergedPdf2.Length);
return result;
}
}
'我想这些Concat的拖arrays'请问您目前的代码工作?你期望它做什么,它不这样做? – mjwills
如果您连接这两个内存流,结果将不是有效的PDF。你为什么不简单地把'ms'中的pdf加入'copy'? – mkl