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QObject::connect problem with argument list

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  • S Offline
    S Offline
    sheehan1234
    wrote on last edited by
    #8

    Does anyone know why I'm getting that error?

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    • K Offline
      K Offline
      Kxyu
      wrote on last edited by
      #9

      Code please. I have a guess, but code first

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      • S Offline
        S Offline
        sheehan1234
        wrote on last edited by
        #10

        Public Declarations:
        @QFileSystemModel model;
        QTreeView tree;
        QString file;@

        The subroutine:
        @void MyWidget::appendFileName()
        {
        file.append((model.data(tree.currentIndex(), Qt::DisplayRole)).toString());
        fileAttained = true;
        }@

        In the main:
        @
        model.setRootPath(QDir::currentPath());
        tree.setModel(&model);
        QWidget *wid = new QWidget;
        button.setText("Select File");

        layout.addWidget(&tree);
        layout.addWidget(&button);

        wid->setLayout(&layout);
        wid->setFixedSize(1100, 500);
        wid->show();

        QObject::connect(&button, SIGNAL(clicked()), this, SLOT(appendFileName()));@

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        • K Offline
          K Offline
          Kxyu
          wrote on last edited by
          #11

          I don't get it. So you define a class MyWidget, then instantiate just simple Widget object and after all use this pointer in main(). Altogether this makes no sense.

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          • S Offline
            S Offline
            sheehan1234
            wrote on last edited by
            #12

            that's my mistake, the main has a function call @widget.getFile();@ which is here:
            @void MyWidget::getFile()
            {
            model.setRootPath(QDir::currentPath());
            tree.setModel(&model);
            tree.setColumnWidth(0, 500);
            tree.resize(1000, 300);
            QWidget *wid = new QWidget;
            button.setText("Select File");

            layout.addWidget(&tree);
            layout.addWidget(&button);

            wid->setLayout(&layout);
            wid->setFixedSize(1100, 500);
            wid->show();

            QObject::connect(&button, SIGNAL(clicked()), this, SLOT(appendFileName()));

            }@

            Maybe this makes a bit more sense, I appreciate you helping. What was your guess?

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            • G Offline
              G Offline
              goetz
              wrote on last edited by
              #13

              Did you declare appendFileName() as a slot in your class header?

              @
              class MyWidget {
              // ....

              protected slots:
              void appendFileName();

              };
              @

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

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              • S Offline
                S Offline
                sheehan1234
                wrote on last edited by
                #14

                yes sir I did

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                • G Offline
                  G Offline
                  goetz
                  wrote on last edited by
                  #15

                  Then show us the complete code, please.

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

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                  • S Offline
                    S Offline
                    sheehan1234
                    wrote on last edited by
                    #16

                    @#include <QtGui>
                    #include <fstream>
                    #include <iostream>

                    using namespace std;

                    class MyWidget : public QWidget
                    {

                    public:
                    MyWidget();
                    float currX1, currX2, currY1, currY2, nextX1, nextX2, nextY1, nextY2;
                    float points[105][105];
                    QString file;
                    int numCols;
                    int numRows;
                    QFileSystemModel model;
                    QTreeView tree;
                    QVBoxLayout layout;
                    QPushButton button;
                    bool fileAttained;
                    void getFile();

                    protected slots:
                    void appendFileName();

                    protected:
                    void paintEvent(QPaintEvent *);

                    };

                    MyWidget::MyWidget()
                    {
                    QPalette palette(MyWidget::palette());
                    palette.setColor(backgroundRole(), Qt::white);
                    setPalette(palette);

                    }

                    void MyWidget::paintEvent(QPaintEvent *)
                    {
                    // omitted
                    }
                    void MyWidget::appendFileName()
                    {
                    file.append((model.data(tree.currentIndex(), Qt::DisplayRole)).toString());
                    fileAttained = true;
                    }
                    void MyWidget::getFile()
                    {
                    model.setRootPath(QDir::currentPath());
                    tree.setModel(&model);
                    tree.setColumnWidth(0, 500);
                    tree.resize(1000, 300);
                    QWidget *wid = new QWidget;
                    button.setText("Select File");

                    layout.addWidget(&tree);
                    layout.addWidget(&button);

                    wid->setLayout(&layout);
                    wid->setFixedSize(1100, 500);
                    wid->show();

                    QObject::connect(&button, SIGNAL(clicked()), this, SLOT(appendFileName()));
                    QObject::connect(&button, SIGNAL(clicked()), wid, SLOT(close()));

                    }
                    int main(int argc, char *argv[])
                    {
                    QApplication app(argc, argv);
                    MyWidget widget;
                    widget.getFile();

                        // omitted 
                    

                    return app.exec();
                    }
                    @

                    I have code commented out/ omitted from the post that does the second part of the program which is what relies on getting the name of the file that the user chooses

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                    • G Offline
                      G Offline
                      giesbert
                      wrote on last edited by
                      #17

                      You missed the Q_OBJECT macro in your header file opf MyWidget:

                      @
                      class MyWidget : public QWidget
                      {
                      // this is missing
                      Q_OBJECT;
                      public:
                      MyWidget();
                      float currX1, currX2, currY1, currY2, nextX1, nextX2, nextY1, nextY2;
                      float points[105][105];

                      protected slots:
                      void appendFileName();

                      protected:
                      void paintEvent(QPaintEvent *);
                      };
                      @

                      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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                      • S Offline
                        S Offline
                        sheehan1234
                        wrote on last edited by
                        #18

                        thank you, I had tried that and gotten errors so I thought it was wrong. so i tried again, got link errors, and I included "main.moc". Now there aren't link errors, but a the moc file has errors that I don't know how to fix. There are about 10 of them, heres the first to give you an example
                        @1>.\GeneratedFiles\Release\main.moc(42) : error C2653: 'MyWidget' : is not a class or namespace name@

                        I can copy the moc file too if you need it

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                        • EddyE Offline
                          EddyE Offline
                          Eddy
                          wrote on last edited by
                          #19

                          Looks like you didn't include mywidget.h in your main.

                          Qt Certified Specialist
                          www.edalsolutions.be

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                          • G Offline
                            G Offline
                            giesbert
                            wrote on last edited by
                            #20

                            Split up the class definition into a header file, and don't put definition and implemenation together in the cpp file.
                            then it should work.

                            Or include main.moc at the end of the file.

                            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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