尝试访问对象方法时出现C ++ Qt分段错误

Question

I am learning Qt, and I have come up with a problem. I would like some help, here as I tried changing variables and debugging it, but haven't come up with a solution. I'll provide some code to understand the problem i have

In my ColorButton.h class file

class ColorButton : public QToolButton
{
    Q_OBJECT
 public:
   explicit ColorButton(const QColor &color, QWidget *parent = 0);
   void testMethod();
};

My ColorButton.cpp file is like this

ColorButton::ColorButton(const QColor &color, QWidget *parent)
{
    //some code
}

void ColorButton::testMethod()
{
   //This is
   //a test method
}

I am trying to access this testMethod() from another class.

From this class, header file is Toolbar.h

class ToolBar : public QToolBar
{
    Q_OBJECT
public:
    explicit ToolBar(const QMap<ToolsEnum, QAction*> &actionMap, QWidget *parent = 0);

private:
    void setToolbar(); //initialize items
    ColorButton *test; //-----

public slots:
    void setMainColorView();
}

The Toolbar.cpp file is like this

ToolBar::ToolBar(const QMap<ToolsEnum, QAction *> &actionMap, QWidget *parent) :
QToolBar(tr("Tools"),parent), actionMapVar(actionMap)
{
    setToolbar();
}

void ToolBar::setToolbar()
{
  test = new ColorButton(QColor("#8C001A"));
}

void ToolBar::setMainColorView()
{
 test->testMethod();
}
}

The program works when i put test->testMethod(); into setToolbar() , but I want to create the object in setToolbar() and call the method in setMainColorView().

So far I have tried making the Color button variable public, I have also tried initializing the object called test in the constructor, but both don't work.

Right now, with this code the error I get is "The inferior stopped because it received a signal from the operating system. Signal name: SIGSEGV Signal meaning: Segmentation fault" with an arrow pointing at test->testMethod(). I have no clue how to solve it, any help would be appreciated

Answer 1

I was looking at the wrong place the entire time. I solved this by passing my toolbar object into the class i was calling setMainColorView() from. In that class i made a local variable of the toolbar object, assigned this. And then it worked.