Creating zip files from c # memory stream

Question

In principle, the user should be able to click on one link and upload multiple PDF files. But Catch - I cannot create files on the server or anywhere. Everything must be remembered.

I managed to create a memory stream and Response.Flush () in pdf format, but how to zip multiple memory streams without creating files.

Here is my code:

    Response.ContentType = "application/zip";

            // If the browser is receiving a mangled zipfile, IIS Compression may cause this problem. Some members have found that
            // Response.ContentType = "application/octet-stream" has solved this. May be specific to Internet Explorer.
            Response.AppendHeader("content-disposition", "attachment; filename=\"Download.zip\"");
            Response.CacheControl = "Private";
            Response.Cache.SetExpires(DateTime.Now.AddMinutes(3)); // or put a timestamp in the filename in the content-disposition                

            byte[] abyBuffer = new byte[4096];

            ZipOutputStream outStream = new ZipOutputStream(Response.OutputStream);

            outStream.SetLevel(3);

            #region Repeat for each Memory Stream
            MemoryStream fStream = CreateClassroomRoster();// This returns a memory stream with pdf document

            ZipEntry objZipEntry = new ZipEntry(ZipEntry.CleanName("ClassroomRoster.pdf"));

            objZipEntry.DateTime = DateTime.Now;

            objZipEntry.Size = fStream.Length;

            outStream.PutNextEntry(objZipEntry);

            int count = fStream.Read(abyBuffer, 0, abyBuffer.Length);

            while (count > 0)
            {
                outStream.Write(abyBuffer, 0, count);

                count = fStream.Read(abyBuffer, 0, abyBuffer.Length);

                if (!Response.IsClientConnected)
                {
                    break;
                }

                Response.Flush();
            }

            fStream.Close();
            #endregion

            outStream.Finish();
            outStream.Close();

            Response.Flush();
            Response.End();

This creates a zip file but there is no file inside it

I use using iTextSharp.text - to create pdf using ICSharpCode.SharpZipLib.Zip - for Zipping

Thank Kavita p>

Answer 1

, zip MemoryStream SharpZipLib: https://github.com/icsharpcode/SharpZipLib/wiki/Zip-Samples#wiki-anchorMemory. iTextSharp, PDF, .

:

        MemoryStream outputMemStream = new MemoryStream();
        ZipOutputStream zipStream = new ZipOutputStream(outputMemStream);

        zipStream.SetLevel(3); //0-9, 9 being the highest level of compression
        byte[] bytes = null;

        // loops through the PDFs I need to create
        foreach (var record in records)
        {
            var newEntry = new ZipEntry("test" + i + ".pdf");
            newEntry.DateTime = DateTime.Now;

            zipStream.PutNextEntry(newEntry);

            bytes = CreatePDF(++i);

            MemoryStream inStream = new MemoryStream(bytes);
            StreamUtils.Copy(inStream, zipStream, new byte[4096]);
            inStream.Close();
            zipStream.CloseEntry();

        }

        zipStream.IsStreamOwner = false;    // False stops the Close also Closing the underlying stream.
        zipStream.Close();          // Must finish the ZipOutputStream before using outputMemStream.

        outputMemStream.Position = 0;

        return File(outputMemStream.ToArray(), "application/octet-stream", "reports.zip");

CreatePDF:

private static byte[] CreatePDF(int i)
    {
        byte[] bytes = null;
        using (MemoryStream ms = new MemoryStream())
        {
            Document document = new Document(PageSize.A4, 25, 25, 30, 30);
            PdfWriter writer = PdfWriter.GetInstance(document, ms);
            document.Open();
            document.Add(new Paragraph("Hello World " + i));
            document.Close();
            writer.Close();
            bytes = ms.ToArray();
        }
        return bytes;

    }

Answer 2

pdf IsolStorageFileStream, .

Answer 3

Zip PDF, .

        using (var outStream = new MemoryStream())
                {
                    using (var archive = new ZipArchive(outStream, ZipArchiveMode.Create, true))
                    {
                        for (String Url in UrlList)
                        {
                            WebRequest req = WebRequest.Create(Url);
                            req.Method = "GET";
                            var fileInArchive = archive.CreateEntry("FileName"+i+ ".pdf", CompressionLevel.Optimal);
                            using (var entryStream = fileInArchive.Open())
                            using (WebResponse response = req.GetResponse())
                            {
                                using (var fileToCompressStream = response.GetResponseStream())
                                {
                                    entryStream.Flush();
                                    fileToCompressStream.CopyTo(entryStream);
                                    fileToCompressStream.Flush();
                                }
                            }
                           i++;
                        }

                    }
                    using (var fileStream = new FileStream(@"D:\test.zip", FileMode.Create))
                    {
                        outStream.Seek(0, SeekOrigin.Begin);
                        outStream.CopyTo(fileStream);
                    }
                }

:    System.IO.Compression;   System.IO.Compression.ZipArchive;

Answer 4

, zip MemoryStream ZipOutputStream, dll ICSharpCode.SharpZipLib.

FileStream fileStream = File.OpenRead(@"G:\1.pdf");
MemoryStream MS = new MemoryStream();

byte[] buffer = new byte[fileStream.Length];
int byteRead = 0;

ZipOutputStream zipOutputStream = new ZipOutputStream(MS);
zipOutputStream.SetLevel(9); //Set the compression level(0-9)
ZipEntry entry = new ZipEntry(@"1.pdf");//Create a file that is needs to be compressed
zipOutputStream.PutNextEntry(entry);//put the entry in zip

//Writes the data into file in memory stream for compression 
while ((byteRead = fileStream.Read(buffer, 0, buffer.Length)) > 0)
    zipOutputStream.Write(buffer, 0, byteRead);

zipOutputStream.IsStreamOwner = false;
fileStream.Close();
zipOutputStream.Close();
MS.Position = 0;