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Downloading file from FTP server

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  • Q Offline
    Q Offline
    Qjay
    wrote on 24 Feb 2018, 16:27 last edited by Qjay
    #1

    Hello all , i want to download a file ( more specifically a PDF file) from an FTP server and later on print it . I want to build it for windows 7/8/10

    I did looked around the web and did found some examples but on some it was clearly mentioned that the program is deprecated .

    Where should i look into ?

    1 Reply Last reply
    0
    • M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 24 Feb 2018, 19:49 last edited by mrjj
      #2

      Hi
      You can still use the QFtp class or use external lib like CURl.

      If you do not require many ftp functions/integration, you could just use curl or wget command line tool and simply
      fire it via QProcess.

      1 Reply Last reply
      3
      • Q Offline
        Q Offline
        Qjay
        wrote on 25 Feb 2018, 09:40 last edited by
        #3

        i am not sure if curl or wget will work on windows . Moreover i want to distribute this utility program so i cannot be sure that others might also have same environment as mine

        M 1 Reply Last reply 25 Feb 2018, 17:57
        0
        • M Offline
          M Offline
          mrdebug
          wrote on 25 Feb 2018, 09:57 last edited by
          #4

          In order to have an http server service based on Qt I'm using Poco
          https://pocoproject.org/ It is very great!
          It has got an ftp component too.

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

          Q 1 Reply Last reply 25 Feb 2018, 18:10
          2
          • Q Qjay
            25 Feb 2018, 09:40

            i am not sure if curl or wget will work on windows . Moreover i want to distribute this utility program so i cannot be sure that others might also have same environment as mine

            M Offline
            M Offline
            mrjj
            Lifetime Qt Champion
            wrote on 25 Feb 2018, 17:57 last edited by mrjj
            #5

            @Qjay
            Hi
            Both wget and CURL runs on windows and linux.
            CURL also run macOS. (CURL even runs in DOS ;)
            https://curl.haxx.se/download.html
            https://eternallybored.org/misc/wget/

            You can just include the tools (.exe) in apps folder.
            They are standalone cmd line, requiring no install and will
            only add 10 MB to the installer size.

            Anyway, not knowing what you really need, maybe sing POCO or QFTP/ something else integrated is better.
            Running a cmdline tool with QProcess is just very easy if all you need is to download a predefined file.

            1 Reply Last reply
            4
            • M mrdebug
              25 Feb 2018, 09:57

              In order to have an http server service based on Qt I'm using Poco
              https://pocoproject.org/ It is very great!
              It has got an ftp component too.

              Q Offline
              Q Offline
              Qjay
              wrote on 25 Feb 2018, 18:10 last edited by
              #6

              @mrdebug thanks i will try it out :D

              1 Reply Last reply
              0
              • V Offline
                V Offline
                VRonin
                wrote on 26 Feb 2018, 08:52 last edited by
                #7

                Curl has a C API https://curl.haxx.se/libcurl/ with bindings in other languages like C++ (http://www.curlpp.org/) so you can build it and link to it on basically all platforms Qt supports.

                Having said that, if you have an ftp url and just want to download it, QNetworkAccessManager is more than enough to achieve your target

                "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

                1 Reply Last reply
                4
                • M Offline
                  M Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on 26 Feb 2018, 08:59 last edited by
                  #8

                  @VRonin said in Downloading file from FTP server:

                  QNetworkAccessManager

                  Hi
                  I could not find a sample for download but this uploads to ftp
                  https://evileg.com/en/post/255/

                  Please update if you find downloading from ftp sample :)

                  V 1 Reply Last reply 26 Feb 2018, 09:12
                  0
                  • J Offline
                    J Offline
                    James Haitching
                    wrote on 26 Feb 2018, 09:03 last edited by
                    #9

                    you can use qftp class derectly in qt4
                    if you are using qt5 ,you can get this class from github

                    1 Reply Last reply
                    0
                    • M mrjj
                      26 Feb 2018, 08:59

                      @VRonin said in Downloading file from FTP server:

                      QNetworkAccessManager

                      Hi
                      I could not find a sample for download but this uploads to ftp
                      https://evileg.com/en/post/255/

                      Please update if you find downloading from ftp sample :)

                      V Offline
                      V Offline
                      VRonin
                      wrote on 26 Feb 2018, 09:12 last edited by VRonin
                      #10

                      @mrjj said in Downloading file from FTP server:

                      Please update if you find downloading from ftp sample

                      It's just a normal get request, as it was http:

                      #include <QCoreApplication>
                      #include <QNetworkAccessManager>
                      #include <QNetworkReply>
                      #include <QNetworkRequest>
                      int main(int argc, char *argv[])
                      {
                          QCoreApplication a(argc,argv);
                          QNetworkAccessManager netMan;
                          QNetworkReply* const repl = netMan.get(QNetworkRequest(QUrl::fromUserInput(R"**(ftp://131.225.104.13/linux/.snapshot/NDMP_AUTO_SNAPSHOT3210/fermi/contrib/obsolete/video/nvidia/5328/NVIDIA.5328.README.txt)**")));
                          QObject::connect(repl,&QNetworkReply::readyRead,[repl]()->void{
                               qDebug().noquote() << repl->readAll();
                           });
                          QObject::connect(repl,QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error),[repl]()->void{
                               qDebug() << "Error: " + repl->errorString();
                           });
                          return a.exec();
                      }
                      

                      @James-Haitching said in Downloading file from FTP server:

                      you can get [QFtp] from github

                      No, that module is outdated and not maintained. Never use old code when you have a chance of using cryptography. If you want to do more advanced stuff (like getting directory listing) then use libcurl/curlpp

                      "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

                      Q 1 Reply Last reply 1 Mar 2018, 18:32
                      5
                      • Q Offline
                        Q Offline
                        Qjay
                        wrote on 1 Mar 2018, 15:36 last edited by
                        #11

                        thanks for so many solutions . I will try all of that but for the time being ( as it was urgent) i used python ( ftp module) and tkinter for a very quick gui .

                        1 Reply Last reply
                        0
                        • V VRonin
                          26 Feb 2018, 09:12

                          @mrjj said in Downloading file from FTP server:

                          Please update if you find downloading from ftp sample

                          It's just a normal get request, as it was http:

                          #include <QCoreApplication>
                          #include <QNetworkAccessManager>
                          #include <QNetworkReply>
                          #include <QNetworkRequest>
                          int main(int argc, char *argv[])
                          {
                              QCoreApplication a(argc,argv);
                              QNetworkAccessManager netMan;
                              QNetworkReply* const repl = netMan.get(QNetworkRequest(QUrl::fromUserInput(R"**(ftp://131.225.104.13/linux/.snapshot/NDMP_AUTO_SNAPSHOT3210/fermi/contrib/obsolete/video/nvidia/5328/NVIDIA.5328.README.txt)**")));
                              QObject::connect(repl,&QNetworkReply::readyRead,[repl]()->void{
                                   qDebug().noquote() << repl->readAll();
                               });
                              QObject::connect(repl,QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error),[repl]()->void{
                                   qDebug() << "Error: " + repl->errorString();
                               });
                              return a.exec();
                          }
                          

                          @James-Haitching said in Downloading file from FTP server:

                          you can get [QFtp] from github

                          No, that module is outdated and not maintained. Never use old code when you have a chance of using cryptography. If you want to do more advanced stuff (like getting directory listing) then use libcurl/curlpp

                          Q Offline
                          Q Offline
                          Qjay
                          wrote on 1 Mar 2018, 18:32 last edited by
                          #12

                          @VRonin said in Downloading file from FTP server:

                          QNetworkAccessManager netMan;
                          QNetworkReply* const repl = netMan.get(QNetworkRequest(QUrl::fromUserInput(R"(ftp://131.225.104.13/linux/.snapshot/NDMP_AUTO_SNAPSHOT3210/fermi/contrib/obsolete/video/nvidia/5328/NVIDIA.5328.README.txt)")));
                          QObject::connect(repl,&QNetworkReply::readyRead,repl->void{
                          qDebug().noquote() << repl->readAll();
                          });
                          QObject::connect(repl,QOverloadQNetworkReply::NetworkError::of(&QNetworkReply::error),repl->void{
                          qDebug() << "Error: " + repl->errorString();
                          });

                          suppose i have to pass login details too , how can i do it ? FTP server is password protected

                          1 Reply Last reply
                          0
                          • V Offline
                            V Offline
                            VRonin
                            wrote on 1 Mar 2018, 18:37 last edited by VRonin 3 Jan 2018, 18:44
                            #13
                            #include <QCoreApplication>
                            #include <QNetworkAccessManager>
                            #include <QNetworkReply>
                            #include <QNetworkRequest>
                            int main(int argc, char *argv[])
                            {
                                QCoreApplication a(argc,argv);
                                QNetworkAccessManager netMan;
                                QNetworkReply* const repl = netMan.get(QNetworkRequest(QUrl::fromUserInput(R"**(ftp://131.225.104.13/linux/.snapshot/NDMP_AUTO_SNAPSHOT3210/fermi/contrib/obsolete/video/nvidia/5328/NVIDIA.5328.README.txt)**")));
                                QObject::connect(repl,&QNetworkReply::readyRead,[repl]()->void{
                                     qDebug().noquote() << repl->readAll();
                                 });
                                QObject::connect(repl,QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error),[repl]()->void{
                                     qDebug() << "Error: " + repl->errorString();
                                 });
                                QObject::connect(repl,&QNetworkReply::finished,repl,&QNetworkReply::deleteLater);
                                QObject::connect(&netMan,&QNetworkAccessManager::authenticationRequired,repl,[repl](QNetworkReply *reply, QAuthenticator *authenticator)->void{
                                    if(reply!=repl) 
                                        return;
                                    aAuthenticator->setUser("MyUserName");
                                    aAuthenticator->setPassword("MyPassword");
                                });
                                return a.exec();
                            }
                            

                            "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

                            1 Reply Last reply
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                            24 Feb 2018, 16:27

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