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Replace specific document in PDF

Includes:

using Ghostscript.NET;
using Ghostscript.NET.Processor;
using Ghostscript.NET.Rasterizer;

I am currently using Ghostscript.Net to combine several separate PDF files into one document:

/// <summary>
/// Ghostscripts the file specified in parameter 1 as a PDF to the file specified in parameter 2
/// </summary>
/// <param name="fileNames">String[]. Array of Full Paths to a file to convert to a single PDF</param>
/// <param name="outputPath">String. Full Path to where Ghostscript will write the PDF</param>
public static void GhostscriptNetJoin(String[] fileNames, String outputPath)
{
    var sb = new StringBuilder();
    foreach (var fileName in fileNames)
    {
        var source = (fileName.IndexOf(' ') == -1) ? fileName : String.Format("\"{0}\"", fileName);
        sb.Append(source + " ");
    }
    var output_file = (outputPath.IndexOf(' ') == -1) ? outputPath : String.Format("\"{0}\"", outputPath);
    var gsArgs = new List<String>();
    gsArgs.Add("-empty"); // first argument is ignored. REF: http://stackoverflow.com/q/25202577/153923
    gsArgs.Add("-dBATCH");
    gsArgs.Add("-q");
    gsArgs.Add("-dNOPAUSE");
    gsArgs.Add("-dNOPROMPT");
    gsArgs.Add("-sDEVICE=pdfwrite");
    gsArgs.Add("-dPDFSETTINGS=/prepress");
    gsArgs.Add(String.Format(@"-sOutputFile={0}", output_file));
    gsArgs.Add(sb.ToString());
    var version = GhostscriptVersionInfo.GetLastInstalledVersion();
    using (var processor = new GhostscriptProcessor(version, false))
    {
        processor.Process(gsArgs.ToArray());
    }
}

How can I return later to the REPLACE or UPDATE N page ?

I missed the routine that has my plan, but at this time I do not know how to complete it. Can I provide values argor is there another tool I should use?

/// <summary>
/// Replace Specific Document from source PDF file
/// </summary>
/// <param name="source">String. Full path to the multi-page PDF</param>
/// <param name="documentN">String. Full path to the document to insert</param>
/// <param name="indexN">int. Page Index where the new document should be inserted</param>
public static void GhostscriptNetReplace(String source, String documentN, int indexN)
{
    var list = new List<String>();
    var version = GhostscriptVersionInfo.GetLastInstalledVersion();
    using (var processor = new GhostscriptProcessor(version, false))
    {
        var gsArgs = new List<String>();
        // what arguments are needed?
        throw new NotImplementedException("I don't know how to code for this yet.");
        processor.Process(gsArgs.ToArray());
    }
    list.RemoveAt(indexN);
    list.Insert(indexN, documentN);
    var sb = new StringBuilder();
    foreach (var fileName in list)
    {
        var fmtSource = (fileName.IndexOf(' ') == -1) ? fileName : String.Format("\"{0}\"", fileName);
        sb.Append(fmtSource + " ");
    }
    var output_file = (source.IndexOf(' ') == -1) ? source : String.Format("\"{0}\"", source);
    using (var processor = new GhostscriptProcessor(version, false))
    {
        var gsArgs = new List<String>();
        gsArgs.Add("-empty"); // first argument is ignored. REF: http://stackoverflow.com/q/25202577/153923
        gsArgs.Add("-dBATCH");
        gsArgs.Add("-q");
        gsArgs.Add("-dNOPAUSE");
        gsArgs.Add("-dNOPROMPT");
        gsArgs.Add("-sDEVICE=pdfwrite");
        gsArgs.Add("-dPDFSETTINGS=/prepress");
        gsArgs.Add(String.Format(@"-sOutputFile={0}", output_file));
        gsArgs.Add(sb.ToString());
        processor.Process(gsArgs.ToArray());
    }
}
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3 answers

I am going to add an answer based on what I read in the baaron post here:

Convert PDF to jpg / image without using a specific c # library

, , . KenS, , , .

/// <summary>
/// Replaces document at provided index with new document.
/// Use with Caution! If you continuously cycle using the output as the input,
/// then you run repeated risks of information or quality loss.
/// </summary>
/// <param name="source">String. Full File Path to Source</param>
/// <param name="documentN">String. Full File Path to new document</param>
/// <param name="indexN">int. Index where file needs to go</param>
public static void GhostscriptNetReplace(String source, String documentN, int indexN)
{
    var list = new List<String>();
    var version = GhostscriptVersionInfo.GetLastInstalledVersion();
    var fullPath = Path.GetFullPath(source);
    int index = -1;
    using (var rasterizer = new Ghostscript.NET.Rasterizer.GhostscriptRasterizer())
    {
        rasterizer.Open(source, version, false);
        for (index = 0; index < rasterizer.PageCount; index++)
        {
            if (index != indexN)
            {
                var extracted = Path.Combine(fullPath, String.Format("~1_{0}.jpg", index));
                if (File.Exists(extracted))
                {
                    File.Delete(extracted);
                }
                var img = rasterizer.GetPage(300, 300, index);
                img.Save(extracted, ImageFormat.Jpeg);
                list.Add(extracted);
            } else
            {
                list.Add(documentN);
            }
        }
        if (index == indexN) // occurs if adding a page to the end
        {
            list.Add(documentN);
        }
    }
    var output_file = (source.IndexOf(' ') == -1) ? source : String.Format("\"{0}\"", source);
    using (var processor = new GhostscriptProcessor(version, false))
    {
        var gsArgs = new List<String>();
        gsArgs.Add("-empty"); // first argument is ignored. REF: https://stackoverflow.com/q/25202577/153923
        gsArgs.Add("-dBATCH");
        gsArgs.Add("-q");
        gsArgs.Add("-dNOPAUSE");
        gsArgs.Add("-dNOPROMPT");
        gsArgs.Add("-sDEVICE=pdfwrite");
        gsArgs.Add("-dPDFSETTINGS=/prepress");
        gsArgs.Add(String.Format(@"-sOutputFile={0}", output_file));
        foreach (var fileName in list)
        {
            var source = (fileName.IndexOf(' ') == -1) ? fileName : String.Format("\"{0}\"", fileName);
            gsArgs.Add(source);
        }
        processor.Process(gsArgs.ToArray());
    }
    foreach (var fileName in list) // delete the temp files
    {
        File.Delete(fileName);
    }
}

, .

untested.

, .

, . , .

+2

, - ( , Ghostscript.NET):

var prcPath = "PATH"; //a path to store the temporary files
var pageCount = GetPDFPageCount(source);
var list = SplitPDFatIndex(source, prcPath, indexN);

private static List<String> SplitPDFatIndex(String pathToFile, String tempPath, int index)
{
    var outList = new List<String>();
    outList.Add(SlicePDFatIndex(pathToFile, tempPath, index, true);
    outlist.Add(null); // Alternatively modify method below to permit pulling page N
    outList.Add(SlicePDFatIndex(pathToFile, tempPath, index, false);

    return outList;
}

private static String SlicePDFatIndex(String pathToFile, String tempPath, int index, bool lessThanIndex)
{
    using (var processor = new GhostscriptProcessor(version, false))
    {
        var pageFrom = 1;
        var pageTo = index - 1;
        var name = tempPath + "temp_left.pdf";

        if (!lessThanIndex)
        {
            pageFrom = index + 1;
            pageTo = pageCount;
            name = tempPath + "temp_right.pdf";
        }

        var gsArgs = new List<String>();
        gsArgs.Add("-empty");
        gsArgs.Add("-dBATCH");
        gsArgs.Add("-q");
        gsArgs.Add("-dNOPAUSE");
        gsArgs.Add("-dNOPROMPT");
        gsArgs.Add("-sDEVICE=pdfwrite");
        gsArgs.Add("-dPDFSETTINGS=/prepress");
        gsArgs.Add(String.Format(@"-f{0}", pathToFile);
        gsArgs.Add("-dFirstPage=" + pageFrom.ToString());
        gsArgs.Add("-dLastPage=" + pageTo.ToString());
        gsArgs.Add(String.Format(@"-sOutputFile={0}", name));
        processor.Process(@"-f{0}", pathToFile);

        return name;
}

private static int GetPDFPageCount(String pathToFile)
{
    var count;
    var GhostscriptViewer viewer;

    viewer = new GhostscriptViewer();
    viewer.ShowPageAfterOpen = false;
    viewer.ProgressiveUpdate = false;
    viewer.Open(source); // try (source, version, false) or (source, version, true) if for some reason it hangs up here
    count = viewer.LastPageNumber;
    viewer.Close()

    return count;
}
+2

:

You can use the PDF Toolkit PDFtk :

Example:

pdftk A=inA.pdf B=inB.pdf cat A1-12 B3 A14-end output out1.pdf

The output consists of the first 12 pages inA.pdf, then page 3 of inB.pdf, and then page 14 to the end inA.pdf.

Many Linux distributions provide a PDFtk package that you can download and install using your package manager.

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Source: https://habr.com/ru/post/1614348/

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