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How to display a picture

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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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        • 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);

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                • 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

                            1 Reply Last reply
                            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

                                1 Reply Last reply
                                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

                                  1 Reply Last reply
                                  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
                                    0
                                    • M Offline
                                      M Offline
                                      Milad 24
                                      Banned
                                      wrote on last edited by
                                      #43
                                      This post is deleted!
                                      1 Reply Last reply
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