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How to display a picture

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  • P Payx

    I put this "file:///C:/Users/David/Documents/addddd/r.jpg"

    Yes i added a Qlabel with the .ui and named label (dont worry i changed the name in my code)

    Pradeep KumarP Offline
    Pradeep KumarP Offline
    Pradeep Kumar
    wrote on last edited by
    #24

    @Payx said in How to display a picture:

    I put this "file:///C:/Users/David/Documents/addddd/r.jpg"

    Yes i added a Qlabel with the .ui and named label (dont worry i changed the name in my code)

    A small info, u can also place image in resource file of the project , so no need to worry about absolute path.

    Pradeep Kumar
    Qt,QML Developer

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    2
    • mrjjM mrjj

      @Payx

      int step=4;
      for (i=0,i<s.width()+1,i=i+step)
        for (j=0,j<s.height()+1,j=j+step)
        just use  QImage QImage::copy(int x, int y, int width, int height) const
      

      This will generate small images of each 4x4

      P Offline
      P Offline
      Payx
      wrote on last edited by
      #25

      @mrjj said in How to display a picture:

      @Payx

      int step=4;
      for (i=0,i<s.width()+1,i=i+step)
        for (j=0,j<s.height()+1,j=j+step)
        just use  QImage QImage::copy(int x, int y, int width, int height) const
      

      This will generate small images of each 4x4

      Okay i will test that.

      I got an other question, with that code : "QImage img("C:/path/filename.jpg");" i have to put the destination of the file (sorry for my english)

      but if i want to create a file explorer (for example in facebook we can change a picture with a file explorer and choose what picture i want)
      what can i do ?

      1 Reply Last reply
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      • mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #26
        • but if i want to create a file explorer (for example in facebook we can change a picture with a file explorer and choose what picture i want)

        Im not 100% sure what you ask, but I give a guess:

        Instead of using a fixed path in the program you can use
        http://doc.qt.io/qt-5/qfiledialog.html
        to let user browser and select an image.

        Like in this example
        http://doc.qt.io/qt-5/qtwidgets-widgets-imageviewer-example.html

        so
        QImage img("C:/path/filename.jpg"
        becomes

        QString imagefile = QFileDialog::getOpenFileNames(this, tr("Files"), QDir::currentPath(), tr("*.jpg *.png"));
        QImage img(imagefile);

        Hope that is what you asked about.

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        0
        • P Offline
          P Offline
          Payx
          wrote on last edited by
          #27

          I found what i sought :

          QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open Image"),"/path",tr("Image Files (*.jpg)"));

          But i got all files, and i just want .jpg for now """"""tr("Image Files (*.jpg)"));"""""""""" dont work ?

          then i want to put my picture file in a label, but i can't find how to convert a QStringList to a Qimage or Qpixmap

          mrjjM 1 Reply Last reply
          0
          • P Payx

            I found what i sought :

            QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open Image"),"/path",tr("Image Files (*.jpg)"));

            But i got all files, and i just want .jpg for now """"""tr("Image Files (*.jpg)"));"""""""""" dont work ?

            then i want to put my picture file in a label, but i can't find how to convert a QStringList to a Qimage or Qpixmap

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by mrjj
            #28

            @Payx
            it should work with *.jpg.

            • but i can't find how to convert a QStringList to a Qimage or Qpixmap

            Oh just use
            fileName = QFileDialog::getOpenFileName(this,
            tr("Open Image"), "/", tr("Image Files (*.png *.jpg *.bmp)"));

            It only returns the 1 filename. ( NOTE THE MISSING s)

            ui->mylabel->setPixmap( new QPixmap(fileName ));

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            0
            • P Offline
              P Offline
              Payx
              wrote on last edited by
              #29

              I got one error : Expected one specifier before pixmap

              mrjjM 1 Reply Last reply
              0
              • P Payx

                I got one error : Expected one specifier before pixmap

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #30

                @Payx
                the class is QPixmap
                so its "new QPixmap"

                setPixmap( new QPixmap(fileName ));

                Sorry, was just fast code.

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                1
                • P Offline
                  P Offline
                  Payx
                  wrote on last edited by
                  #31

                  Yes i tried too before post but i had one error too, so i post the first error.

                  The second is :
                  No matching function for call to 'Qlabel::setPixmap(QPixmap*)"

                  mrjjM 1 Reply Last reply
                  2
                  • P Payx

                    Yes i tried too before post but i had one error too, so i post the first error.

                    The second is :
                    No matching function for call to 'Qlabel::setPixmap(QPixmap*)"

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by mrjj
                    #32

                    @Payx
                    Sorry not enough coffee :)

                    QPixmap pix(fileName );
                    setPixmap(pix);

                    1 Reply Last reply
                    3
                    • Pradeep KumarP Offline
                      Pradeep KumarP Offline
                      Pradeep Kumar
                      wrote on last edited by Pradeep Kumar
                      #33

                      If u are using QImage

                      m_imageLabel = new QLabel;
                      QImage imagePixmap;
                      imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                      m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));
                      

                      Or

                      Only QPixmap

                      m_imageLabel = new QLabel;
                      QPixmap imagePixmap;
                      imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                      m_imageLabel->setPixmap(imagePixmap);
                      

                      imageName.extension can be image.png, image.jpeg.

                      Pradeep Kumar
                      Qt,QML Developer

                      P 1 Reply Last reply
                      2
                      • Pradeep KumarP Pradeep Kumar

                        If u are using QImage

                        m_imageLabel = new QLabel;
                        QImage imagePixmap;
                        imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                        m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));
                        

                        Or

                        Only QPixmap

                        m_imageLabel = new QLabel;
                        QPixmap imagePixmap;
                        imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                        m_imageLabel->setPixmap(imagePixmap);
                        

                        imageName.extension can be image.png, image.jpeg.

                        P Offline
                        P Offline
                        Payx
                        wrote on last edited by
                        #34

                        @Pradeep-Kumar said in How to display a picture:

                        If u are using QImage

                        m_imageLabel = new QLabel;
                        QImage imagePixmap;
                        imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                        m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));
                        

                        Or

                        Only QPixmap

                        m_imageLabel = new QLabel;
                        QPixmap imagePixmap;
                        imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                        m_imageLabel->setPixmap(imagePixmap);
                        

                        imageName.extension can be image.png, image.jpeg.

                        U didnt read the thread i think :-).
                        But thx

                        @mrjj Lol no problem :-)
                        Thanks it works i will create an other thread for an other question after

                        Pradeep KumarP 1 Reply Last reply
                        2
                        • Pradeep KumarP Offline
                          Pradeep KumarP Offline
                          Pradeep Kumar
                          wrote on last edited by
                          #35

                          Thread says how to display a picture

                          @Payx
                          Is this the thing?.
                          correct me if i was wrong.

                          Pradeep Kumar
                          Qt,QML Developer

                          P 1 Reply Last reply
                          1
                          • Pradeep KumarP Pradeep Kumar

                            Thread says how to display a picture

                            @Payx
                            Is this the thing?.
                            correct me if i was wrong.

                            P Offline
                            P Offline
                            Payx
                            wrote on last edited by
                            #36

                            @Pradeep-Kumar said in How to display a picture:

                            Thread says how to display a picture

                            @Payx
                            Is this the thing?.
                            correct me if i was wrong.

                            wow u just answer the question after 5 guys answer me.

                            1 Reply Last reply
                            1
                            • Pradeep KumarP Offline
                              Pradeep KumarP Offline
                              Pradeep Kumar
                              wrote on last edited by
                              #37

                              Hmmmmmmmmmm was toooooooooooo late.:)))

                              Pradeep Kumar
                              Qt,QML Developer

                              1 Reply Last reply
                              1
                              • P Payx

                                @Pradeep-Kumar said in How to display a picture:

                                If u are using QImage

                                m_imageLabel = new QLabel;
                                QImage imagePixmap;
                                imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                                m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));
                                

                                Or

                                Only QPixmap

                                m_imageLabel = new QLabel;
                                QPixmap imagePixmap;
                                imagePixmap.load(":/new/prefix1/Images/imageName.extension");
                                m_imageLabel->setPixmap(imagePixmap);
                                

                                imageName.extension can be image.png, image.jpeg.

                                U didnt read the thread i think :-).
                                But thx

                                @mrjj Lol no problem :-)
                                Thanks it works i will create an other thread for an other question after

                                Pradeep KumarP Offline
                                Pradeep KumarP Offline
                                Pradeep Kumar
                                wrote on last edited by
                                #38

                                Thanks it works i will create an other thread for an other question after

                                If it is working can u mark thread has solved, so it will be useful in future.
                                Cheers.:)))))))

                                Thanks,

                                Pradeep Kumar
                                Qt,QML Developer

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                                1
                                • P Offline
                                  P Offline
                                  Payx
                                  wrote on last edited by
                                  #39

                                  How can i do that ?

                                  1 Reply Last reply
                                  0
                                  • Pradeep KumarP Offline
                                    Pradeep KumarP Offline
                                    Pradeep Kumar
                                    wrote on last edited by Pradeep Kumar
                                    #40

                                    u have already marked as solved for this thread.

                                    Pradeep Kumar
                                    Qt,QML Developer

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                                    0
                                    • Pradeep KumarP Offline
                                      Pradeep KumarP Offline
                                      Pradeep Kumar
                                      wrote on last edited by
                                      #41

                                      Anyways in the right bottom of the topic u will see topic button and u see mark as solved under the topic button, click on it.

                                      :)

                                      Thanks.

                                      Pradeep Kumar
                                      Qt,QML Developer

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                                      1
                                      • S Offline
                                        S Offline
                                        spice
                                        wrote on last edited by
                                        #42

                                        The link address has expired
                                        Please pay attention to select the example corresponding to your current qt version in the upper right corner
                                        https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/widgets/imageviewer?h=5.15

                                        1 Reply Last reply
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                                        • M Offline
                                          M Offline
                                          Milad 24
                                          Banned
                                          wrote on last edited by
                                          #43
                                          This post is deleted!
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