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How to Login to my FTP Account

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  • 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
                0
                • R rezaMSLM

                  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 Online
                  jsulmJ Online
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #22

                  @rezaMSLM

                  MainWindow::MainWindow()
                  {
                      connect(&ftp, SIGNAL(stateChanged(int)), this, SLOT(checkState(int)));
                  }
                  
                  void MainWindow::checkState(int state)
                  {
                      switch(state) {
                      case QFtp::Connected:
                          break;
                      ...
                      }
                  }
                  
                  // From QFtp header file:
                  enum State {
                          Unconnected,
                          HostLookup,
                          Connecting,
                          Connected,
                          LoggedIn,
                          Closing
                  };
                  

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

                  R 1 Reply Last reply
                  2
                  • jsulmJ jsulm

                    @rezaMSLM

                    MainWindow::MainWindow()
                    {
                        connect(&ftp, SIGNAL(stateChanged(int)), this, SLOT(checkState(int)));
                    }
                    
                    void MainWindow::checkState(int state)
                    {
                        switch(state) {
                        case QFtp::Connected:
                            break;
                        ...
                        }
                    }
                    
                    // From QFtp header file:
                    enum State {
                            Unconnected,
                            HostLookup,
                            Connecting,
                            Connected,
                            LoggedIn,
                            Closing
                    };
                    
                    R Offline
                    R Offline
                    rezaMSLM
                    wrote on last edited by
                    #23

                    @jsulm Thanks alot

                    1 Reply Last reply
                    0
                    • R Offline
                      R Offline
                      rezaMSLM
                      wrote on last edited by
                      #24

                      my program has a BUG:
                      when I'm already Connected to server and I Click on Connect button again none of the buttons will work.
                      neither login nor disconnect buttons

                      my mainwindow.cpp:

                      #include "mainwindow.h"
                      #include "ui_mainwindow.h"
                      #include <QtNetwork/QFtp>
                      
                      
                      MainWindow::MainWindow(QWidget *parent) :
                          QMainWindow(parent),
                          ui(new Ui::MainWindow)
                      
                      {
                          ui->setupUi(this);
                          ftp = new QFtp(parent);
                          connect(ftp, SIGNAL(stateChanged(int)), this, SLOT(checkState(int)));
                      }
                      
                      MainWindow::~MainWindow()
                      {
                          delete ui;
                          delete ftp;
                      }
                      
                      void MainWindow::checkState(int state)
                      {
                          switch(state) {
                          case QFtp::Connected:
                              ui->Connect_Status_Label->setText("Connected");
                              break;
                          case QFtp::Unconnected:
                              ui->Connect_Status_Label->setText("UnConnected");
                              ui->Login_Status_Label->setText("Logged Out");
                              break;
                          case QFtp:: LoggedIn:
                              ui->Login_Status_Label->setText("Logged in");
                              break;
                          }
                      }
                      
                      void MainWindow::on_pushButton_Connect_clicked()
                      {
                          QString Host = ui->lineEdit_Host->text();
                          ftp->connectToHost(Host);
                      }
                      
                      void MainWindow::on_pushButton_Login_clicked()
                      {
                          QString UserName = ui->lineEdit_User->text();
                          QString PassWord = ui->lineEdit_Pass->text();
                          ftp->login(UserName,PassWord);
                      }
                      
                      void MainWindow::on_pushButton_DisConnect_clicked()
                      {
                          ftp->close();
                      }
                      
                      

                      what is the reason?

                      jsulmJ 1 Reply Last reply
                      0
                      • R rezaMSLM

                        my program has a BUG:
                        when I'm already Connected to server and I Click on Connect button again none of the buttons will work.
                        neither login nor disconnect buttons

                        my mainwindow.cpp:

                        #include "mainwindow.h"
                        #include "ui_mainwindow.h"
                        #include <QtNetwork/QFtp>
                        
                        
                        MainWindow::MainWindow(QWidget *parent) :
                            QMainWindow(parent),
                            ui(new Ui::MainWindow)
                        
                        {
                            ui->setupUi(this);
                            ftp = new QFtp(parent);
                            connect(ftp, SIGNAL(stateChanged(int)), this, SLOT(checkState(int)));
                        }
                        
                        MainWindow::~MainWindow()
                        {
                            delete ui;
                            delete ftp;
                        }
                        
                        void MainWindow::checkState(int state)
                        {
                            switch(state) {
                            case QFtp::Connected:
                                ui->Connect_Status_Label->setText("Connected");
                                break;
                            case QFtp::Unconnected:
                                ui->Connect_Status_Label->setText("UnConnected");
                                ui->Login_Status_Label->setText("Logged Out");
                                break;
                            case QFtp:: LoggedIn:
                                ui->Login_Status_Label->setText("Logged in");
                                break;
                            }
                        }
                        
                        void MainWindow::on_pushButton_Connect_clicked()
                        {
                            QString Host = ui->lineEdit_Host->text();
                            ftp->connectToHost(Host);
                        }
                        
                        void MainWindow::on_pushButton_Login_clicked()
                        {
                            QString UserName = ui->lineEdit_User->text();
                            QString PassWord = ui->lineEdit_Pass->text();
                            ftp->login(UserName,PassWord);
                        }
                        
                        void MainWindow::on_pushButton_DisConnect_clicked()
                        {
                            ftp->close();
                        }
                        
                        

                        what is the reason?

                        jsulmJ Online
                        jsulmJ Online
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by jsulm
                        #25

                        @rezaMSLM I don't understand: you're connected and then click connected again? Afterwards disconnect doesn't work? Does disconnect work if you don't click connect when already connected? You should disable the connect button if already connected and enable it when disconnected.

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

                        R 1 Reply Last reply
                        1
                        • jsulmJ jsulm

                          @rezaMSLM I don't understand: you're connected and then click connected again? Afterwards disconnect doesn't work? Does disconnect work if you don't click connect when already connected? You should disable the connect button if already connected and enable it when disconnected.

                          R Offline
                          R Offline
                          rezaMSLM
                          wrote on last edited by
                          #26

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

                          you're connected and then click connected again? Afterwards disconnect doesn't work?

                          yes

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

                          Does disconnect work if you don't click connect when already connected?

                          yes

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

                          You should disable the connect button if already connected and enable it when disconnected.

                          OK

                          1 Reply Last reply
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