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  4. help!: how to display image through http url
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help!: how to display image through http url

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  • Christian EhrlicherC Christian Ehrlicher

    Please use the code tags to make your code readable - currently noone can read anything in your code.

    N Offline
    N Offline
    nguyenhuy
    wrote on last edited by
    #11

    @Christian-Ehrlicher oh~ sr i'm newbiee

    1 Reply Last reply
    0
    • SGaistS SGaist

      Hi,

      @nguyenhuy said in help!: how to display image through http url:

      i have created a standard mainboard in qt-creator. and suplied it with the example filedownloader from:
      "http://developer.qt.nokia.com/wiki/Download_Data_from_URL"

      You might want to update your links, this one has been dead for quite a while now.

      N Offline
      N Offline
      nguyenhuy
      wrote on last edited by
      #12

      @SGaist yes please

      SGaistS 1 Reply Last reply
      0
      • N nguyenhuy

        @SGaist yes please

        SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #13

        @nguyenhuy said in help!: how to display image through http url:

        @SGaist yes please

        That's up to you to update them, you found them in the first place.

        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
        • JonBJ JonB

          @nguyenhuy
          As @Christian-Ehrlicher has said, please make the effort to use the forum's Code tags button.

          Meanwhile, as per the error message, this code uses m_pImgCtrl which looks like a member variable but is not declared in the class in the .h file.

          N Offline
          N Offline
          nguyenhuy
          wrote on last edited by
          #14

          i tried i out with
          @QbyteArray m_pImgCtrl;

          JonBJ 1 Reply Last reply
          0
          • N nguyenhuy

            i tried i out with
            @QbyteArray m_pImgCtrl;

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by JonB
            #15

            @nguyenhuy
            And?

            I think you should be looking at https://wiki.qt.io/Download_Data_from_URL rather than your deceased nokia link. There you will see

            m_pImgCtrl = new FileDownloader(imageUrl, this);
            

            so you are supposed to figure for yourself that the member variable declaration will need to be

            FileDownloader *m_pImgCtrl;
            
            N 1 Reply Last reply
            3
            • JonBJ JonB

              @nguyenhuy
              And?

              I think you should be looking at https://wiki.qt.io/Download_Data_from_URL rather than your deceased nokia link. There you will see

              m_pImgCtrl = new FileDownloader(imageUrl, this);
              

              so you are supposed to figure for yourself that the member variable declaration will need to be

              FileDownloader *m_pImgCtrl;
              
              N Offline
              N Offline
              nguyenhuy
              wrote on last edited by
              #16

              @JonB unknown type name FileDownloader

              jsulmJ 1 Reply Last reply
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              • N nguyenhuy

                @JonB unknown type name FileDownloader

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

                @nguyenhuy Did you include filedownloader.h?

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

                N 1 Reply Last reply
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                • jsulmJ jsulm

                  @nguyenhuy Did you include filedownloader.h?

                  N Offline
                  N Offline
                  nguyenhuy
                  wrote on last edited by
                  #18

                  @jsulm said in help!: how to display image through http url:

                  Did you include filedownloader.h

                  yes, sir

                  jsulmJ 1 Reply Last reply
                  -1
                  • N nguyenhuy

                    @jsulm said in help!: how to display image through http url:

                    Did you include filedownloader.h

                    yes, sir

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

                    @nguyenhuy Please show your current code

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

                    N 1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @nguyenhuy Please show your current code

                      N Offline
                      N Offline
                      nguyenhuy
                      wrote on last edited by
                      #20

                      @jsulm ```
                      code_text
                      mainwindow.h

                      #define MAINWINDOW_H
                      #include <QtWidgets/QMainWindow>
                      
                      
                      namespace Ui {
                      class MainWindow;
                      }
                      
                      class mainwindow :public QMainWindow
                      {
                          Q_OBJECT
                      public:
                          explicit mainwindow(QWidget *parent = 0);
                          ~mainwindow();
                      signals:
                          void downloaded();
                      
                      private slots:
                          void loadImage();
                          void on_pushButton_clicked();
                      private:
                          Ui::MainWindow *ui;
                          FileDownloader *m_pImgCtrl;
                      };
                      
                      #endif // MAINWINDOW_H
                      
                      mainwindow.cpp
                      
                      #include "mainwindow.h"
                      #include "ui_mainwindow.h"
                      #include "filedownloader.h"
                      #include "QUrl"
                      #include <QtWidgets/QMainWindow>
                      
                      mainwindow::mainwindow(QWidget *parent) :
                          QMainWindow(parent),
                          ui(new Ui::MainWindow)
                      {
                      
                      QUrl imageUrl("...");
                      m_pImgCtrl = new FileDownloader(imageUrl, this);
                      
                      connect(m_pImgCtrl, SIGNAL(downloaded()), SLOT(loadImage()));
                      }
                      mainwindow::~mainwindow()
                      {
                      delete ui;
                      }
                      
                      void mainwindow::loadImage()
                      {
                      QPixmap buttonImage;
                      buttonImage.loadFromData(m_pImgCtrl->downloadedData());
                      
                      }
                      jsulmJ 1 Reply Last reply
                      0
                      • N nguyenhuy

                        @jsulm ```
                        code_text
                        mainwindow.h

                        #define MAINWINDOW_H
                        #include <QtWidgets/QMainWindow>
                        
                        
                        namespace Ui {
                        class MainWindow;
                        }
                        
                        class mainwindow :public QMainWindow
                        {
                            Q_OBJECT
                        public:
                            explicit mainwindow(QWidget *parent = 0);
                            ~mainwindow();
                        signals:
                            void downloaded();
                        
                        private slots:
                            void loadImage();
                            void on_pushButton_clicked();
                        private:
                            Ui::MainWindow *ui;
                            FileDownloader *m_pImgCtrl;
                        };
                        
                        #endif // MAINWINDOW_H
                        
                        mainwindow.cpp
                        
                        #include "mainwindow.h"
                        #include "ui_mainwindow.h"
                        #include "filedownloader.h"
                        #include "QUrl"
                        #include <QtWidgets/QMainWindow>
                        
                        mainwindow::mainwindow(QWidget *parent) :
                            QMainWindow(parent),
                            ui(new Ui::MainWindow)
                        {
                        
                        QUrl imageUrl("...");
                        m_pImgCtrl = new FileDownloader(imageUrl, this);
                        
                        connect(m_pImgCtrl, SIGNAL(downloaded()), SLOT(loadImage()));
                        }
                        mainwindow::~mainwindow()
                        {
                        delete ui;
                        }
                        
                        void mainwindow::loadImage()
                        {
                        QPixmap buttonImage;
                        buttonImage.loadFromData(m_pImgCtrl->downloadedData());
                        
                        }
                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #21

                        @nguyenhuy Why did you say that you included filedownloader.h if you did not?!
                        You have to include it in mainwindow.h as you use it there. Or, as an alternative, make a forward declaration of FileDownloader in mainwindow.h and include filedownloader.h in mainwindow.cpp.
                        This is basic C++ knowledge...

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

                        1 Reply Last reply
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