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How to manage zip file

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  • VRoninV Offline
    VRoninV Offline
    VRonin
    wrote on last edited by VRonin
    #8

    yes with http://quazip.sourceforge.net/classQuaZip.html#ae52ebadd5ce64cdb49d7e198904b0b8c
    create a QDataStream operating on the QByteArary and then pass QDataStream::device() to that constructor.

    On the other hand, I'm not sure what you are trying to do but you might not need QuaZip at all, have a look at http://doc.qt.io/qt-5/qbytearray.html#qCompress and below

    "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
    ~Napoleon Bonaparte

    On a crusade to banish setIndexWidget() from the holy land of Qt

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    • mrdebugM Offline
      mrdebugM Offline
      mrdebug
      wrote on last edited by
      #9

      Someting like this?

                          QDataStream BufferIn(&Source, QIODevice::ReadOnly);
                          QuaZipFile quaZip(BufferIn.device());
                          qDebug() << quaZip.open(QIODevice::ReadOnly);
      

      returns false...

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      • VRoninV Offline
        VRoninV Offline
        VRonin
        wrote on last edited by VRonin
        #10

        QuaZipFile represents a file inside a zip file, not a zip file in itself. the constructor you are calling is this one: http://quazip.sourceforge.net/classQuaZipFile.html#a1349ad27f1947bc3e346d83dbf9586c4 use QuaZip instead.

        P.S.
        QDataStream BufferIn(&Source, QIODevice::ReadOnly); is the same as QDataStream BufferIn(Source);

        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
        ~Napoleon Bonaparte

        On a crusade to banish setIndexWidget() from the holy land of Qt

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        • mrdebugM Offline
          mrdebugM Offline
          mrdebug
          wrote on last edited by
          #11

          After many tries I can't unzip something without to use a file.
          These lines of code

                                  QDataStream BufferIn(&QBABufferOut, QIODevice::ReadOnly);
                                  QuaZip quaZip(BufferIn.device());
          
          

          does not seem to work.

          Need programmers to hire?
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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #12

            Hi,

            What do you have in QBABufferOut ?
            Are you sure it's opened correctly ?
            Why do you need BufferIn for ?

            And most important, what do you mean by does not seem to work? That's to vague to help you.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • mrdebugM Offline
              mrdebugM Offline
              mrdebug
              wrote on last edited by
              #13

              Please have a look at this sequence:

                                          QuaZipFile quaZip(QBABufferOut);                // (rapresents a zip archivie in ram).
                                          if (quaZip.open(QIODevice::ReadOnly)) {         // QIODevice::ReadOnly or someting else
                                              qDebug() << "ok";
                                          } else qDebug() << "error";                     // always error!!!!!!!!!!!!
              
              

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              • VRoninV Offline
                VRoninV Offline
                VRonin
                wrote on last edited by VRonin
                #14

                You have to open the QuaZip for decompression first:

                    QBuffer storageBuff(&QBABufferOut);
                    QuaZip zip(&storageBuff);
                    if (!zip.open(QuaZip::mdUnzip))
                        qDebug() << "error";
                    QuaZipFile file(&zip);
                    for (bool f = zip.goToFirstFile(); f; f = zip.goToNextFile()) {
                        QuaZipFileInfo fileInfo;
                        file.getFileInfo(&fileInfo);
                        qDebug() << fileInfo.name;
                        file.open(QIODevice::ReadOnly);
                        
                        qDebug() << "Content: " << file.readAll().toBase64();
                        file.close();
                    }
                    zip.close();
                

                P.S.

                // (rapresents a zip archivie in ram).

                No it doesn't. As mentioned before QuaZipFile represent a file inside a zip archive, not the archive itself

                "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                ~Napoleon Bonaparte

                On a crusade to banish setIndexWidget() from the holy land of Qt

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                • mrdebugM Offline
                  mrdebugM Offline
                  mrdebug
                  wrote on last edited by
                  #15

                  It works perfectly.
                  Many thanks.

                  Need programmers to hire?
                  www.labcsp.com
                  www.denisgottardello.it
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                  Skype: mrdebug

                  Ramkumar MohanR 1 Reply Last reply
                  0
                  • VRoninV VRonin

                    The only answer is zlib, you just need to decide the flavour

                    • QuaZIP (handles only .zip, wrapper around zlib)
                    • KArchive (supports multiple compression formats, for zip it's a wrapper on zlib)
                    • zlib if you don't mind C then you can use directly the reference library for zip files

                    I personally use KArchive because it's already conveniently wrapped in a Qt style and it can rely on the support of KDE

                    SPlattenS Offline
                    SPlattenS Offline
                    SPlatten
                    wrote on last edited by
                    #16

                    @VRonin said in How to manage zip file:

                    QuaZIP

                    Is there a license associated with the use of this? As I have a need for compressing large amounts of binary data that I need to transmit to remote clients.

                    Kind Regards,
                    Sy

                    jsulmJ 1 Reply Last reply
                    0
                    • SPlattenS SPlatten

                      @VRonin said in How to manage zip file:

                      QuaZIP

                      Is there a license associated with the use of this? As I have a need for compressing large amounts of binary data that I need to transmit to remote clients.

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #17

                      @SPlatten said in How to manage zip file:

                      Is there a license associated with the use of this?

                      https://github.com/stachenov/quazip

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • SPlattenS Offline
                        SPlattenS Offline
                        SPlatten
                        wrote on last edited by
                        #18

                        Thank you,

                        Kind Regards,
                        Sy

                        artwawA 1 Reply Last reply
                        0
                        • SPlattenS SPlatten

                          Thank you,

                          artwawA Offline
                          artwawA Offline
                          artwaw
                          wrote on last edited by
                          #19

                          @SPlatten if both ends are in your software I'd suggest agains using 3rd party library. qCompress and qUncompress work just fine in that regard. My usual approach is to supply a header (using QDataStream) with checksum and whatever else is needed, then stream to it output from compression routine. Works sufficiently well, eliminates the need for another dependency.

                          For more information please re-read.

                          Kind Regards,
                          Artur

                          SPlattenS 1 Reply Last reply
                          2
                          • artwawA artwaw

                            @SPlatten if both ends are in your software I'd suggest agains using 3rd party library. qCompress and qUncompress work just fine in that regard. My usual approach is to supply a header (using QDataStream) with checksum and whatever else is needed, then stream to it output from compression routine. Works sufficiently well, eliminates the need for another dependency.

                            SPlattenS Offline
                            SPlattenS Offline
                            SPlatten
                            wrote on last edited by
                            #20

                            @artwaw , Thank you, I will have a look.

                            Kind Regards,
                            Sy

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                            • mrdebugM mrdebug

                              It works perfectly.
                              Many thanks.

                              Ramkumar MohanR Offline
                              Ramkumar MohanR Offline
                              Ramkumar Mohan
                              wrote on last edited by
                              #21

                              @mrdebug Which file works properly in this?

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                              • mrdebugM Offline
                                mrdebugM Offline
                                mrdebug
                                wrote on last edited by
                                #22

                                Hi, I'm working with zip files.

                                Need programmers to hire?
                                www.labcsp.com
                                www.denisgottardello.it
                                GMT+1
                                Skype: mrdebug

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