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Installation and getting started with first app

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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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    • 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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        • 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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          • 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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            • 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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              • 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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                    • 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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                      • 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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                            • 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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                                • 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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                                  • 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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                                    • G Offline
                                      G Offline
                                      giesbert
                                      wrote on last edited by
                                      #57

                                      YOu are startin g without QtCreator, right?

                                      Did you try to search the forum for answers?

                                      see this "post":http://developer.qt.nokia.com/forums/viewthread/4869

                                      Nokia Certified Qt Specialist.
                                      Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                                      • K Offline
                                        K Offline
                                        KennedyDayala
                                        wrote on last edited by
                                        #58

                                        yes Gerolf..I searched..everybody says that we need to set the invironment varioables..I did that too but of no use..

                                        Never Ever Give Up

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                                        • G Offline
                                          G Offline
                                          giesbert
                                          wrote on last edited by
                                          #59

                                          put the needed dlls beside your exe or set the PATH environment variable to contain the path to mingw10.dll.

                                          Nokia Certified Qt Specialist.
                                          Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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