Compression file doc pdf use 7zipsharp?

Question

// This my code compress use 7 zip

  if (System.IO.Directory.Exists(targetfolder))
                {
                    try
                    {

                        SevenZipCompressor.SetLibraryPath(@Server.MapPath("~/bin/7z.Libs.16.2.1/bin/x64/7z.dll")); 
                        SevenZipCompressor sevenZipCompressor = new SevenZipCompressor();
                        sevenZipCompressor.CompressionLevel = SevenZip.CompressionLevel.Ultra; // level compress
                        sevenZipCompressor.CompressionMethod = CompressionMethod.Lzma2; //method compress
                        sevenZipCompressor.CompressDirectory(sourceCodeFolder, Path.Combine(targetfolder, string.Concat(DateTime.Now.ToString("ddMMyyyy_HHmm") + fldr + ".zip")));
                    }

                    catch (Exception se)
                    {
                        SevenZipCompressor.SetLibraryPath(@Server.MapPath("~/bin/7z.Libs.16.2.1/bin/x86/7z.dll"));
                        SevenZipCompressor sevenZipCompressor = new SevenZipCompressor();
                        sevenZipCompressor.CompressionLevel = SevenZip.CompressionLevel.Ultra; // level compress 
                        sevenZipCompressor.CompressionMethod = CompressionMethod.Lzma2; // method compress

//what is wrong my code? sevenZipCompressor.CompressDirectory(sourceCodeFolder, Path.Combine(targetfolder, string.Concat(DateTime.Now.ToString("ddMMyyyy_HHmm") + fldr + ".zip")));

                    }


                    Directory.Delete(@Server.MapPath("~/Upload/" + fldr), true);
                    extractfrom = @Server.MapPath("~/Upload/ZIP/" + string.Concat(DateTime.Now.ToString("ddMMyyyy_HHmm")) + fldr + ".zip");

                    customSQL.ExecQueryString(" UPDATE TBL_PROGRESS_LEGAL_DOKUMEN set FileName = '" + string.Concat(DateTime.Now.ToString("ddMMyyyy_HHmm")  + namafile + ".zip"+ "'  , [FileSize] = '" + filesize + "'  where id_progress_legal_dokumen = '" + id_chekUpload.Text + "'"));
                    myfeedback._success("File Success Upload");
                }

                else
                {

                }

my question why 7zip make compress 7mb to be 6mb only?

score 1 · Answer 1 · answered Nov 24 '17 at 02:28

1

(Most) PDFs are already compressed and you cannot gain much by archiving them.

Why don't some files compress very much?
Which files does not reduce its size after compression

answered Nov 24 '17 at 02:28

wp78de

18,207
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Ok thanks sir, how about the doc file i tried from 899 kb just be 715 kb, is it that way? – Rahmat Nov 24 '17 at 02:42
There is no general answer. If your DOC files contain a lot of (uncompressed) text, it's bad. If there a re a lot of (already compressed) JPGs - it's most likely fine. – wp78de Nov 24 '17 at 02:56

Compression file doc pdf use 7zipsharp?

1 Answers1