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How to Login to my FTP Account

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi and welcome to devnet,

    What about the example provided with the module ?

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

    1 Reply Last reply
    3
    • R Offline
      R Offline
      rezaMSLM
      wrote on last edited by
      #3

      I'm a newbie in Qt (and poor English);
      i have made a new project in Qt and want to include QFtp to my project but i dont know where i have to write "#include <QtNetwork/QFtp>"!! (in main.cpp or mainwindow.cpp file??)

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        Where you will use an object that class.

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

        1 Reply Last reply
        0
        • R Offline
          R Offline
          rezaMSLM
          wrote on last edited by
          #5

          @SGaist

          i want to have a "Login" button in my GUI and login to my account when i press that.
          so i have to include QFtp class in "mainwindow.cpp" .

          Now i want to create new QFtp object with this command:
          QFtp *ftp=new Qftp();
          but i receive this error:

          expected type-specifier before 'Qftp'
          QFtp *ftp=new Qftp();

          jsulmJ 1 Reply Last reply
          0
          • R rezaMSLM

            @SGaist

            i want to have a "Login" button in my GUI and login to my account when i press that.
            so i have to include QFtp class in "mainwindow.cpp" .

            Now i want to create new QFtp object with this command:
            QFtp *ftp=new Qftp();
            but i receive this error:

            expected type-specifier before 'Qftp'
            QFtp *ftp=new Qftp();

            jsulmJ Online
            jsulmJ Online
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #6

            @rezaMSLM It is QFtp not Qftp...

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

            1 Reply Last reply
            3
            • R Offline
              R Offline
              rezaMSLM
              wrote on last edited by
              #7

              my mainwindow.cpp contents:

              #include "ui_mainwindow.h"
              #include <QtNetwork/QFtp>
              
              QFtp *ftp=new QFtp();
              
              MainWindow::MainWindow(QWidget *parent) :
                  QMainWindow(parent),
                  ui(new Ui::MainWindow)
              
              {
                  ui->setupUi(this);
              }
              
              MainWindow::~MainWindow()
              {
                  delete ui;
              }
              
              void MainWindow::on_pushButton_clicked()
              {
              
              }
              
              

              and my 3 Errors:
              In function `_static_initialization_and_destruction_0':

              undefined reference to `_imp___ZN4QFtpC1EP7QObject'

              error: ld returned 1 exit status

              jsulmJ 1 Reply Last reply
              0
              • R rezaMSLM

                my mainwindow.cpp contents:

                #include "ui_mainwindow.h"
                #include <QtNetwork/QFtp>
                
                QFtp *ftp=new QFtp();
                
                MainWindow::MainWindow(QWidget *parent) :
                    QMainWindow(parent),
                    ui(new Ui::MainWindow)
                
                {
                    ui->setupUi(this);
                }
                
                MainWindow::~MainWindow()
                {
                    delete ui;
                }
                
                void MainWindow::on_pushButton_clicked()
                {
                
                }
                
                

                and my 3 Errors:
                In function `_static_initialization_and_destruction_0':

                undefined reference to `_imp___ZN4QFtpC1EP7QObject'

                error: ld returned 1 exit status

                jsulmJ Online
                jsulmJ Online
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #8

                @rezaMSLM said in How to Login to my FTP Account:

                QFtp *ftp=new QFtp();

                This is bad!
                Don't do this with Qt classes.
                ftp should be class member in your MainWindow class.

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

                R 1 Reply Last reply
                1
                • jsulmJ jsulm

                  @rezaMSLM said in How to Login to my FTP Account:

                  QFtp *ftp=new QFtp();

                  This is bad!
                  Don't do this with Qt classes.
                  ftp should be class member in your MainWindow class.

                  R Offline
                  R Offline
                  rezaMSLM
                  wrote on last edited by
                  #9

                  @jsulm said in How to Login to my FTP Account:

                  @rezaMSLM said in How to Login to my FTP Account:

                  QFtp *ftp=new QFtp();

                  This is bad!
                  Don't do this with Qt classes.
                  ftp should be class member in your MainWindow class.

                  would you please correct my above Code?

                  jsulmJ 1 Reply Last reply
                  0
                  • R rezaMSLM

                    @jsulm said in How to Login to my FTP Account:

                    @rezaMSLM said in How to Login to my FTP Account:

                    QFtp *ftp=new QFtp();

                    This is bad!
                    Don't do this with Qt classes.
                    ftp should be class member in your MainWindow class.

                    would you please correct my above Code?

                    jsulmJ Online
                    jsulmJ Online
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #10

                    @rezaMSLM

                    // In your header file
                    class MainWindow...
                    private:
                        QFtp ftp;
                    }
                    
                    // cpp file
                    MainWindow::MainWindow(QWidget *parent) :
                        QMainWindow(parent),
                        ui(new Ui::MainWindow)
                    {
                        ui->setupUi(this);
                    }
                    
                    MainWindow::~MainWindow()
                    {
                        delete ui;
                    }
                    
                    void MainWindow::on_pushButton_clicked()
                    {
                    
                    }
                    

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

                    1 Reply Last reply
                    0
                    • R Offline
                      R Offline
                      rezaMSLM
                      wrote on last edited by
                      #11

                      my header file:

                      #ifndef MAINWINDOW_H
                      #define MAINWINDOW_H
                      
                      #include <QMainWindow>
                      
                      
                      namespace Ui {
                      class MainWindow;
                      }
                      
                      class MainWindow : public QMainWindow
                      {
                          Q_OBJECT
                      
                      /*added Code:*/
                      private:
                          QFtp ftp;
                      /***********/
                      public:
                          explicit MainWindow(QWidget *parent = 0);
                      
                          ~MainWindow();
                      
                      private slots:
                          void on_pushButton_clicked();
                      
                      private:
                          Ui::MainWindow *ui;
                      };
                      
                      #endif // MAINWINDOW_H
                      

                      my Errors:
                      'QFtp' does not name a type
                      QFtp ftp;
                      ^

                      jsulmJ 1 Reply Last reply
                      0
                      • R rezaMSLM

                        my header file:

                        #ifndef MAINWINDOW_H
                        #define MAINWINDOW_H
                        
                        #include <QMainWindow>
                        
                        
                        namespace Ui {
                        class MainWindow;
                        }
                        
                        class MainWindow : public QMainWindow
                        {
                            Q_OBJECT
                        
                        /*added Code:*/
                        private:
                            QFtp ftp;
                        /***********/
                        public:
                            explicit MainWindow(QWidget *parent = 0);
                        
                            ~MainWindow();
                        
                        private slots:
                            void on_pushButton_clicked();
                        
                        private:
                            Ui::MainWindow *ui;
                        };
                        
                        #endif // MAINWINDOW_H
                        

                        my Errors:
                        'QFtp' does not name a type
                        QFtp ftp;
                        ^

                        jsulmJ Online
                        jsulmJ Online
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        @rezaMSLM Didn't you forget to include the header file?

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

                        R 1 Reply Last reply
                        0
                        • jsulmJ jsulm

                          @rezaMSLM Didn't you forget to include the header file?

                          R Offline
                          R Offline
                          rezaMSLM
                          wrote on last edited by
                          #13

                          @jsulm said in How to Login to my FTP Account:

                          @rezaMSLM Didn't you forget to include the header file?

                          No,
                          my mainwindow.h file content:

                          #ifndef MAINWINDOW_H
                          #define MAINWINDOW_H
                          
                          #include <QMainWindow>
                          
                          
                          namespace Ui {
                          class MainWindow;
                          }
                          
                          class MainWindow : public QMainWindow
                          {
                              Q_OBJECT
                          
                          /*added Code:*/
                          private:
                              QFtp ftp;
                          /***********/
                          public:
                              explicit MainWindow(QWidget *parent = 0);
                          
                              ~MainWindow();
                          
                          private slots:
                              void on_pushButton_clicked();
                          
                          private:
                              Ui::MainWindow *ui;
                          };
                          
                          #endif // MAINWINDOW_H
                          
                          

                          main.cpp:

                          #include "mainwindow.h"
                          #include <QApplication>
                          
                          
                          int main(int argc, char *argv[])
                          {
                              QApplication a(argc, argv);
                              MainWindow w;
                              w.show();
                          
                              return a.exec();
                          }
                          
                          

                          mainwindow.cpp:

                          #include "mainwindow.h"
                          #include "ui_mainwindow.h"
                          #include <QtNetwork/QFtp>
                          
                          //QFtp *ftp=new QFtp();
                          
                          MainWindow::MainWindow(QWidget *parent) :
                              QMainWindow(parent),
                              ui(new Ui::MainWindow)
                          
                          {
                              ui->setupUi(this);
                          }
                          
                          MainWindow::~MainWindow()
                          {
                              delete ui;
                          }
                          
                          void MainWindow::on_pushButton_clicked()
                          {
                          
                          }
                          
                          

                          .pro contents:

                          #-------------------------------------------------
                          #
                          # Project created by QtCreator 2018-02-28T21:06:27
                          #
                          #-------------------------------------------------
                          
                          QT       += core gui
                          
                          greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                          
                          TARGET = ftp2
                          TEMPLATE = app
                          
                          # The following define makes your compiler emit warnings if you use
                          # any feature of Qt which has been marked as deprecated (the exact warnings
                          # depend on your compiler). Please consult the documentation of the
                          # deprecated API in order to know how to port your code away from it.
                          DEFINES += QT_DEPRECATED_WARNINGS
                          
                          # You can also make your code fail to compile if you use deprecated APIs.
                          # In order to do so, uncomment the following line.
                          # You can also select to disable deprecated APIs only up to a certain version of Qt.
                          #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                          
                          
                          SOURCES += \
                                  main.cpp \
                                  mainwindow.cpp
                          
                          HEADERS += \
                                  mainwindow.h
                          
                          FORMS += \
                                  mainwindow.ui
                          
                          
                          jsulmJ 1 Reply Last reply
                          0
                          • R rezaMSLM

                            @jsulm said in How to Login to my FTP Account:

                            @rezaMSLM Didn't you forget to include the header file?

                            No,
                            my mainwindow.h file content:

                            #ifndef MAINWINDOW_H
                            #define MAINWINDOW_H
                            
                            #include <QMainWindow>
                            
                            
                            namespace Ui {
                            class MainWindow;
                            }
                            
                            class MainWindow : public QMainWindow
                            {
                                Q_OBJECT
                            
                            /*added Code:*/
                            private:
                                QFtp ftp;
                            /***********/
                            public:
                                explicit MainWindow(QWidget *parent = 0);
                            
                                ~MainWindow();
                            
                            private slots:
                                void on_pushButton_clicked();
                            
                            private:
                                Ui::MainWindow *ui;
                            };
                            
                            #endif // MAINWINDOW_H
                            
                            

                            main.cpp:

                            #include "mainwindow.h"
                            #include <QApplication>
                            
                            
                            int main(int argc, char *argv[])
                            {
                                QApplication a(argc, argv);
                                MainWindow w;
                                w.show();
                            
                                return a.exec();
                            }
                            
                            

                            mainwindow.cpp:

                            #include "mainwindow.h"
                            #include "ui_mainwindow.h"
                            #include <QtNetwork/QFtp>
                            
                            //QFtp *ftp=new QFtp();
                            
                            MainWindow::MainWindow(QWidget *parent) :
                                QMainWindow(parent),
                                ui(new Ui::MainWindow)
                            
                            {
                                ui->setupUi(this);
                            }
                            
                            MainWindow::~MainWindow()
                            {
                                delete ui;
                            }
                            
                            void MainWindow::on_pushButton_clicked()
                            {
                            
                            }
                            
                            

                            .pro contents:

                            #-------------------------------------------------
                            #
                            # Project created by QtCreator 2018-02-28T21:06:27
                            #
                            #-------------------------------------------------
                            
                            QT       += core gui
                            
                            greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                            
                            TARGET = ftp2
                            TEMPLATE = app
                            
                            # The following define makes your compiler emit warnings if you use
                            # any feature of Qt which has been marked as deprecated (the exact warnings
                            # depend on your compiler). Please consult the documentation of the
                            # deprecated API in order to know how to port your code away from it.
                            DEFINES += QT_DEPRECATED_WARNINGS
                            
                            # You can also make your code fail to compile if you use deprecated APIs.
                            # In order to do so, uncomment the following line.
                            # You can also select to disable deprecated APIs only up to a certain version of Qt.
                            #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                            
                            
                            SOURCES += \
                                    main.cpp \
                                    mainwindow.cpp
                            
                            HEADERS += \
                                    mainwindow.h
                            
                            FORMS += \
                                    mainwindow.ui
                            
                            
                            jsulmJ Online
                            jsulmJ Online
                            jsulm
                            Lifetime Qt Champion
                            wrote on last edited by
                            #14

                            @rezaMSLM You did forget.
                            You're using QFtp class now in your header file, so you need to move

                            #include <QtNetwork/QFtp>
                            

                            to the header file, else compiler has no idea what QFtp is.

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

                            R 1 Reply Last reply
                            3
                            • jsulmJ jsulm

                              @rezaMSLM You did forget.
                              You're using QFtp class now in your header file, so you need to move

                              #include <QtNetwork/QFtp>
                              

                              to the header file, else compiler has no idea what QFtp is.

                              R Offline
                              R Offline
                              rezaMSLM
                              wrote on last edited by rezaMSLM
                              #15

                              @jsulm said in How to Login to my FTP Account:

                              @rezaMSLM You did forget.
                              You're using QFtp class now in your header file, so you need to move

                              #include <QtNetwork/QFtp>
                              

                              to the header file, else compiler has no idea what QFtp is.

                              now i have moved it to mainwindow.h
                              doesn't solved and here are the errors:
                              0_1519933030240_Capture.JPG

                              jsulmJ 1 Reply Last reply
                              0
                              • R rezaMSLM

                                @jsulm said in How to Login to my FTP Account:

                                @rezaMSLM You did forget.
                                You're using QFtp class now in your header file, so you need to move

                                #include <QtNetwork/QFtp>
                                

                                to the header file, else compiler has no idea what QFtp is.

                                now i have moved it to mainwindow.h
                                doesn't solved and here are the errors:
                                0_1519933030240_Capture.JPG

                                jsulmJ Online
                                jsulmJ Online
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #16

                                @rezaMSLM Do you have this in your pro file:

                                QT += ftp
                                

                                You do not link your app against QFtp currently.
                                Here is an example: https://github.com/qt/qtftp/tree/master/examples/qftp

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

                                R 1 Reply Last reply
                                3
                                • jsulmJ jsulm

                                  @rezaMSLM Do you have this in your pro file:

                                  QT += ftp
                                  

                                  You do not link your app against QFtp currently.
                                  Here is an example: https://github.com/qt/qtftp/tree/master/examples/qftp

                                  R Offline
                                  R Offline
                                  rezaMSLM
                                  wrote on last edited by
                                  #17

                                  @jsulm said in How to Login to my FTP Account:

                                  @rezaMSLM Do you have this in your pro file:

                                  QT += ftp
                                  

                                  You do not link your app against QFtp currently.
                                  Here is an example: https://github.com/qt/qtftp/tree/master/examples/qftp

                                  Thank you jsulm;
                                  QT+=ftp didnt work
                                  but QT+=network worked!
                                  Now i receive No Error

                                  1 Reply Last reply
                                  0
                                  • R Offline
                                    R Offline
                                    rezaMSLM
                                    wrote on last edited by rezaMSLM
                                    #18

                                    I built an object in mainwindow.h file using this command:

                                    class MainWindow...
                                    private:
                                        QFtp *ftp;
                                    }
                                    

                                    and call these commands when clicking on "Login" Button:

                                    void MainWindow::on_pushButton_clicked()
                                    {
                                        ftp->connectToHost("my Host IP");
                                        ftp->login("my user name" , "my password");
                                    }
                                    

                                    and when I Run the project and click on Login button it crashes.

                                    but if i change the code like this it won't crash:

                                    class MainWindow...
                                    private:
                                        QFtp ftp;
                                    }
                                    
                                    void MainWindow::on_pushButton_clicked()
                                    {
                                        ftp.connectToHost("my Host IP");
                                        ftp.login("my user name" , "my password");
                                    }
                                    

                                    why?

                                    jsulmJ 1 Reply Last reply
                                    0
                                    • R rezaMSLM

                                      I built an object in mainwindow.h file using this command:

                                      class MainWindow...
                                      private:
                                          QFtp *ftp;
                                      }
                                      

                                      and call these commands when clicking on "Login" Button:

                                      void MainWindow::on_pushButton_clicked()
                                      {
                                          ftp->connectToHost("my Host IP");
                                          ftp->login("my user name" , "my password");
                                      }
                                      

                                      and when I Run the project and click on Login button it crashes.

                                      but if i change the code like this it won't crash:

                                      class MainWindow...
                                      private:
                                          QFtp ftp;
                                      }
                                      
                                      void MainWindow::on_pushButton_clicked()
                                      {
                                          ftp.connectToHost("my Host IP");
                                          ftp.login("my user name" , "my password");
                                      }
                                      

                                      why?

                                      jsulmJ Online
                                      jsulmJ Online
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on last edited by jsulm
                                      #19

                                      @rezaMSLM Because if you use a pointer you need to create an instance and assign the pointer, else you're using a dangling pointer (a pointer not pointing to a valid chunk of memory). You should read about memory management in C/C++.

                                      MainWindow::MainWindow()
                                      {
                                          ftp = new QFtp();
                                      }
                                      

                                      Why do you want to use a pointer?

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

                                      R 1 Reply Last reply
                                      1
                                      • jsulmJ jsulm

                                        @rezaMSLM Because if you use a pointer you need to create an instance and assign the pointer, else you're using a dangling pointer (a pointer not pointing to a valid chunk of memory). You should read about memory management in C/C++.

                                        MainWindow::MainWindow()
                                        {
                                            ftp = new QFtp();
                                        }
                                        

                                        Why do you want to use a pointer?

                                        R Offline
                                        R Offline
                                        rezaMSLM
                                        wrote on last edited by
                                        #20

                                        @jsulm I even don't know when I have to use pointer and when not!!!

                                        1 Reply Last reply
                                        0
                                        • R Offline
                                          R Offline
                                          rezaMSLM
                                          wrote on last edited by
                                          #21

                                          when I click on login button and connectToHost() Command is executed how I notice that it's connected?
                                          I know that some signals are emitted but i dont know how to use them

                                          jsulmJ 1 Reply Last reply
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