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Installation and getting started with first app

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  • M Offline
    M Offline
    mlong
    wrote on last edited by
    #37

    In order to use the QSystemStorageInfo class from Mobility, be sure that in your .pro file you have included the lines

    @
    CONFIG += mobility
    MOBILITY += systeminfo
    @

    Software Engineer
    My views and opinions do not necessarily reflect those of anyone -- living or dead, real or fictional -- in this universe or any other similar multiverse node. Void where prohibited. Your mileage may vary. Caveat emptor.

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    • K Offline
      K Offline
      KennedyDayala
      wrote on last edited by
      #38

      Thanks a lot...

      without changing .pro file I am trying with QDir::Drives()..I will update you soon about my results..before that I have another query...

      I have placed my controls on the main window by opening 'mainwindow.ui' in design mode..how would I create control variables for those controls in my code using QTCreator ?

      Never Ever Give Up

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      • A Offline
        A Offline
        andre
        wrote on last edited by
        #39

        "control variables"? You mean you need a pointer to them?

        @
        m_ui->myCoolLineEdit->setText("I'm so cool!");
        @

        works for me. myCoolLineEdit is of course the name you gave the widget in Designer, and m_ui is the member variable that holds the UI class you created.

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        • K Offline
          K Offline
          KennedyDayala
          wrote on last edited by
          #40

          excellent..now i understood this part Andre..I have creaed a QTreeWidget on my MainWindow and coded like tihs..

          @
          ui->treeWidgetDrives = new QTreeWidget();
          ui->treeWidgetDrives->setColumnCount(1);
          QStringList strlstHeaders;
          strlstHeaders<<tr("Storage Drives");
          ui->treeWidgetDrives->setHeaderLabels(strlstHeaders);
          @

          ...when i run my code nothing is happened to my TreeWidget(no header is assigned)..instead it is showing the properties which i set from 'Edit Tree Widget' dialog !!!

          [EDIT: code formatting, please use @-tags, Volker]

          Never Ever Give Up

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          0
          • G Offline
            G Offline
            goetz
            wrote on last edited by
            #41

            The tree widget is automatically created for you. Just remove the first line of your snippet.

            http://www.catb.org/~esr/faqs/smart-questions.html

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            • K Offline
              K Offline
              KennedyDayala
              wrote on last edited by
              #42

              if i remove that line and run the code I am not getting my Window displayed and here is the ouput..

              Starting E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe...
              E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe exited with code -1073741819

              Never Ever Give Up

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              0
              • G Offline
                G Offline
                goetz
                wrote on last edited by
                #43

                code -1073741819 = 0xC0000005. On windows this means an access violation. Seems like your UI is not initialized properly or messed up in some way....

                http://www.catb.org/~esr/faqs/smart-questions.html

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                0
                • K Offline
                  K Offline
                  KennedyDayala
                  wrote on last edited by
                  #44

                  perfect analysis..

                  I have moved this line to bottom of the code like this..

                  @
                  IDT_MainWindow::IDT_MainWindow(QWidget *parent) :
                  QMainWindow(parent),
                  ui(new Ui::IDT_MainWindow)

                  {
                  // my code here...

                      ui->setupUi(this);
                  

                  }
                  @

                  now i moved it to top and works fine..thanks a ton

                  [EDIT: code formatting, please use @-tags or the editor button, Volker]

                  Never Ever Give Up

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                  0
                  • K Offline
                    K Offline
                    KennedyDayala
                    wrote on last edited by
                    #45

                    only one child item is being shown to my TreeWidget..please look into my code and lemme know where I went wrong !!

                    @IDT_MainWindow::IDT_MainWindow(QWidget *parent) :
                    QMainWindow(parent),
                    ui(new Ui::IDT_MainWindow)

                    {
                    ui->setupUi(this);

                    ui->treeWidgetDrives->setColumnCount(1);
                    QStringList strlstHeaders;
                    strlstHeaders<<tr("Storage Drives");
                    ui->treeWidgetDrives->setHeaderLabels(strlstHeaders);
                    
                    SetupTreeItems();
                    

                    }
                    void IDT_MainWindow::SetupTreeItems()
                    {
                    QTreeWidgetItem *treeItems = new QTreeWidgetItem(ui->treeWidgetDrives);
                    treeItems->setText(0,tr("SystemDrives"));
                    QTreeWidgetItem *treeChildItems = new QTreeWidgetItem(treeItems);
                    QDir dir;
                    dir.setFilter(QDir::Drives);

                    QFileInfoList roots = dir.drives();
                    
                    for(int i=0 ; i<roots.count() ; ++i)
                    {
                        QFileInfo fiDrives = roots.at(i);
                        QString strDrive = fiDrives.absoluteFilePath();
                        treeChildItems->setText(i,strDrive);
                    }
                    

                    }@

                    Never Ever Give Up

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                    0
                    • G Offline
                      G Offline
                      goetz
                      wrote on last edited by
                      #46

                      You must create a new item in your loop. You just overwrite the on you have in each iteration.

                      http://www.catb.org/~esr/faqs/smart-questions.html

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                      • A Offline
                        A Offline
                        andre
                        wrote on last edited by
                        #47

                        Your loop keeps on updating the text of the same tree item. Do you really expect to see more of them then?

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                        0
                        • K Offline
                          K Offline
                          KennedyDayala
                          wrote on last edited by
                          #48

                          you mean like this ??

                          @for(int i=0 ; i<roots.count() ; ++i)
                          {
                          treeChildItems = new QTreeWidgetItem(treeItems);
                          QFileInfo fiDrives = roots.at(i);
                          QString strDrive = fiDrives.absoluteFilePath();
                          treeChildItems->setText(i,strDrive);
                          }@

                          Never Ever Give Up

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                          0
                          • G Offline
                            G Offline
                            goetz
                            wrote on last edited by
                            #49

                            [quote author="Thomas Kennedy" date="1301584395"]you mean like this ??

                            @for(int i=0 ; i<roots.count() ; ++i)
                            {
                            treeChildItems = new QTreeWidgetItem(treeItems);
                            QFileInfo fiDrives = roots.at(i);
                            QString strDrive = fiDrives.absoluteFilePath();
                            treeChildItems->setText(i,strDrive);
                            }@
                            [/quote]

                            You can try it to get the answer :-)

                            http://www.catb.org/~esr/faqs/smart-questions.html

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                            0
                            • K Offline
                              K Offline
                              KennedyDayala
                              wrote on last edited by
                              #50

                              tried...it added an 'empty item' at 0th position,and 'c:' at 1st..and no more :-(

                              Never Ever Give Up

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                              • A Offline
                                A Offline
                                andre
                                wrote on last edited by
                                #51

                                So... you need to aquire some debugging skills... Just try to follow what happens in your code. Don't guess: measure instead. Try for instance to insert statements like this at every relevant point in your function, and look at the output:

                                @
                                qDebug() << LINE;
                                @

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                                • K Offline
                                  K Offline
                                  KennedyDayala
                                  wrote on last edited by
                                  #52

                                  :-)) ok..will do that..

                                  Never Ever Give Up

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                                  0
                                  • G Offline
                                    G Offline
                                    goetz
                                    wrote on last edited by
                                    #53

                                    Of course you must have an empty first entry, because you create this one outside your loop (line 21 in your original code snippet).

                                    This is the compactified working version:

                                    @
                                    void FancyClass::populate() {
                                    ui->treeWidget->setColumnCount(1);
                                    QStringList headers;
                                    headers << "Storage Device";
                                    ui->treeWidget->setHeaderLabels(headers);

                                    QTreeWidgetItem *rootItem = new QTreeWidgetItem(ui->treeWidget);
                                    rootItem->setText(0, "SystemDevice");
                                    
                                    foreach(QFileInfo drive, QDir::drives()) {
                                        QTreeWidgetItem *driveItem = new QTreeWidgetItem(rootItem);
                                        driveItem->setText(0, drive.absoluteFilePath());
                                    }
                                    

                                    }
                                    @

                                    http://www.catb.org/~esr/faqs/smart-questions.html

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                                    • A Offline
                                      A Offline
                                      andre
                                      wrote on last edited by
                                      #54

                                      /me is thinking that instead of building a tree like that himself, he would use a QFileSystemModel instead...

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                                      0
                                      • K Offline
                                        K Offline
                                        KennedyDayala
                                        wrote on last edited by
                                        #55

                                        thanks a lot...I will try with QFileSystemModel too..

                                        Never Ever Give Up

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                                        0
                                        • K Offline
                                          K Offline
                                          KennedyDayala
                                          wrote on last edited by
                                          #56

                                          "The program can't start because mingwm10.dll is missing from your computer.Try reinstalling the program to fix this problem."

                                          ..i am getting this error when i tried running my application in stand alone mode...any help ??

                                          Never Ever Give Up

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