//In the interest of time i will copy past the code for Itext7 Implementation.
//idea is a thought process.
//so code is almost looks same-
//1.create a stream,
//2.create a pdf document object,
//3.read pdf file from specified location and
//4.use Merge Method to copy pdf files.
public string MergePDF(List <string> sourceFileList, string outputFilePath)
{
using (var stream = new FileStream(outputFilePath, FileMode.Create))
{
var Outputpdf = new PdfDocument(new PdfWriter(stream));
var pdfMerger = new PdfMerger(Outputpdf);
foreach (string file in sourceFileList)
{
var pdf = new PdfDocument(new PdfReader(file));
int numberofPages = pdf.GetNumberOfPages();
pdfMerger.SetCloseSourceDocuments(true).Merge(pdf, 1, numberofPages);
}
Outputpdf.Close();
}
return(outputFilePath);
}
protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
PdfDocument srcDoc1 = new PdfDocument(new PdfReader(SRC1));
PdfDocument srcDoc2 = new PdfDocument(new PdfReader(SRC2));
PdfDocument srcDoc3 = new PdfDocument(new PdfReader(SRC3));
int numberOfPages1 = srcDoc1.GetNumberOfPages();
int numberOfPages2 = srcDoc2.GetNumberOfPages();
int numberOfPages3 = srcDoc3.GetNumberOfPages();
PdfMerger merger = new PdfMerger(pdfDoc);
merger.SetCloseSourceDocuments(true)
.Merge(srcDoc1, 1, numberOfPages1)
.Merge(srcDoc2, 1, numberOfPages2)
.Merge(srcDoc3, 1, numberOfPages3);
PdfOutline rootOutline = pdfDoc.GetOutlines(false);
int page = 1;
PdfOutline helloWorld = rootOutline.AddOutline("Hello World");
helloWorld.AddDestination(PdfExplicitDestination.CreateFit(pdfDoc.GetPage(page)));
page += numberOfPages1;
PdfOutline link1 = helloWorld.AddOutline("link1");
link1.AddDestination(PdfExplicitDestination.CreateFit(pdfDoc.GetPage(page)));
page += numberOfPages2;
PdfOutline link2 = rootOutline.AddOutline("Link 2");
link2.AddDestination(PdfExplicitDestination.CreateFit(pdfDoc.GetPage(page)));
pdfDoc.Close();
}
internal PdfDocument Merge(string outputFile, PdfMergeTree mergeTree)
{
Form1.configProgressBar(mergeTree.count);
listOptions();
if (!VerifyOutputFile(outputFile))
{
throw new IOException("Invalid Output File");
}
PdfWriter writer = new PdfWriter(outputFile);
destPdf = new PdfDocument(writer);
destPdfOutlines = destPdf.GetOutlines(false);
PdfMerger merger = new PdfMerger(destPdf, MERGE_TAGS, MERGE_BOOKMARKS);
merger.SetCloseSourceDocuments(false);
logMsgDbLn2("");
int pageCount = merge(merger, mergeTree.GetMergeItems, 1) - 1;
logMsgFmtln("total page count", pageCount);
if (pageCount < 1)
{
destPdf.Close();
return(null);
}
if (KEEP_IMPORT_BOOKMARKS && ADD_BOOKMARK_FOR_EACH_FILE)
{
// process and adjust bookmarks
MergeOutlines(destPdf.GetOutlines(true).GetAllChildren(),
mergeTree.GetMergeItems);
}
if (!(KEEP_IMPORT_BOOKMARKS && !ADD_BOOKMARK_FOR_EACH_FILE))
{
// eliminate all of the current bookmarks
destPdfOutlines = clearOutline(destPdf);
}
if (ADD_BOOKMARK_FOR_EACH_FILE)
{
// add the new bookmarks
addOutline(mergeTree.GetMergeItems, destPdfOutlines, 0);
}
// all complete
// leave open for further processing
// destPdf.Close();
// return the final PDF document
PdfCatalog destPdfCatalog = destPdf.GetCatalog();
destPdfCatalog.SetPageMode(PdfName.UseOutlines);
destPdfCatalog.SetPageLayout(PdfName.SinglePage);
destPdfCatalog.SetOpenAction(PdfExplicitDestination.CreateFit(1));
return(destPdf);
}
