更新
请参阅完整解决方案的答案。
我现在更新了代码,以便最后几行读取:
reader.Close();
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
reader.Close();
}
}
文档已成功完成,但最终的PDF已损坏(我假设因为它没有正确关闭)
作为Word-to-PDF转换和合并过程的一部分,我运行以下方法将所有PDF合并为1个超级PDF(带iTextSharp.text.pdf
):
public void Pdfs(string targetPdf, List<string> orderedList, string targetFolder, string spSite)
{
var f = 0;
// we create a reader for a certain document
var reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
var n = reader.NumberOfPages;
// step 1: creation of a document-object
var document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));
// step 2: we create a writer that listens to the document
var writer = PdfWriter.GetInstance(document, new FileStream(targetPdf, FileMode.Create));
// step 3: we open the document
document.Open();
var cb = writer.DirectContent;
PdfImportedPage page;
int rotation;
// step 4: we add content
var pdfPageName = 0;
var pdfNewPageFlag = true;
while (f < orderedList.Count)
{
var i = 0;
while (i < n)
{
i++;
document.SetPageSize(reader.GetPageSizeWithRotation(i));
document.NewPage();
if (pdfNewPageFlag)
{
var chapter = new iTextSharp.text.Chapter(orderedList[pdfPageName], pdfPageName + 1);
document.Add(chapter);
pdfNewPageFlag = false;
pdfPageName++;
}
page = writer.GetImportedPage(reader, i);
rotation = reader.GetPageRotation(i);
if (rotation == 90 || rotation == 270)
{
cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
}
else
{
cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
}
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
}
// step 5: we close the document
document.Close();
}
此方法还会在每个原始文档的开头创建一个书签。一旦文档全部合并,我调用此方法删除文件:
private static void DeletePdfs()
{
// Delete the files
foreach (var file in orderedListPdfFileNames)
{
var newFileName = tempfolder + file;
File.Delete(newFileName);
}
}
但是在尝试实际删除文件时,我看到了这个异常:
mscorlib.dll中出现未处理的“System.IO.IOException”类型异常
其他信息:该进程无法访问文件'\ file \ IT \ SK \ test \ HrDocs \ Cover.pdf',因为它正由另一个进程使用。
在PDFs
方法中,我尝试在writer.Close()
之前和之后调用reader.Close()
和document.Close()
,但之后我收到了消息Cannot close a document which is already closed
。< / p>
是否有人能够帮助解决这个问题或者指出我正确的方向?我似乎无法弄清楚Merge进程的哪个部分正在锁定文件!
答案 0 :(得分:3)
这只是一个不在正确位置关闭读者的案例。
正如评论中提到的那样,如果document.Close()
在关闭读者后失败,那么我需要在之后关闭读者。
在下面的修订中,我在创建后将每个读者添加到列表中,并且最后都将它们关闭:
public void Pdfs(string targetPdf, List<string> orderedList, string targetFolder, string spSite)
{
var readerlist = new List<PdfReader>();
var f = 0;
// we create a reader for a certain document
var reader = new PdfReader(targetFolder + orderedList[f]);
readerlist.Add(reader);
// we retrieve the total number of pages
var n = reader.NumberOfPages;
// step 1: creation of a document-object
var document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));
// step 2: we create a writer that listens to the document
var writer = PdfWriter.GetInstance(document, new FileStream(targetPdf, FileMode.Create));
// step 3: we open the document
document.Open();
var cb = writer.DirectContent;
PdfImportedPage page;
int rotation;
// step 4: we add content
var pdfPageName = 0;
var pdfNewPageFlag = true;
while (f < orderedList.Count)
{
var i = 0;
while (i < n)
{
i++;
document.SetPageSize(reader.GetPageSizeWithRotation(i));
document.NewPage();
if (pdfNewPageFlag)
{
var chapter = new iTextSharp.text.Chapter(orderedList[pdfPageName], pdfPageName + 1);
document.Add(chapter);
pdfNewPageFlag = false;
pdfPageName++;
}
page = writer.GetImportedPage(reader, i);
rotation = reader.GetPageRotation(i);
if (rotation == 90 || rotation == 270)
{
cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
}
else
{
cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
}
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
readerlist.Add(reader);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
}
// step 5: we close the document
document.Close();
foreach (var rdr in readerlist)
{
rdr.Close();
}
}