Question

I have a problem handling a function pointer.I have made a class Control that has a function pointer as member:

void (*mouseFunction) (Control*, Event*);

The member is protected, and it has setter and getter:

void (*getMouseFunction()) (Control*,Event*)
{
    return mouseFunction;
}
void setMouseFunction( void (*mouseFunction) (Control*, Event*) )
{
    this->mouseFunction=mouseFunction;
}

The problem is that even after setting the pointer, it’s always NULL.
I have a function declared inside a header file:

void mouseFunction (Control* control, Event* event)
{
    std::cout << "Inside Text Field";
}

If I try to assign it:

myControlInstance.setMouseFunction(mouseFunction);

If I use the getter to get the pointer it’s NULL; and if I try to execute the function I get EXC_BAD_ACCESS:

error: address doesn't contain a section that points to a section in a object file

Answer 1

Following cod is working, so be sure that youre method is public to be accessible from other place than object.

typedef int Event;

class Control
{

public:
    void (*mouseFunction) (Control*, Event*);

    void (*getMouseFunction()) (Control*,Event*)
    {
        return mouseFunction;
    }

    void setMouseFunction( void (*mouseFunction) (Control*, Event*) )
    {
        this->mouseFunction=mouseFunction;
    }
};


void mouseFunction (Control* control, Event* event)
{
    printf ("test");
}


int _tmain(int argc, _TCHAR* argv[])
{

    Control c;
    c.setMouseFunction(mouseFunction);
    Event e = 1;
    c.mouseFunction(&c,&e);
    return 0;
}