C / C++ / MFC

19-Jul-16 4:52

Can anyone tell me how can I access the x in the following statement: FirstClass obj3(200, 300);
Here Y = 200, X = 300;
X is initialized by calling the constructor BaseClass(x)
FirstClass inherits BaseClass with protected access specifier.

C++

#include <iostream>
using namespace std;

class BaseClass
{
private:
    int x;
public:
    BaseClass()
    {
        cout << "\n BaseClass(default) called." << endl;
    }
    BaseClass(int x)
    {
        cout << "\n BaseClass(parameters) called." << endl;
        this->x = x;
    }
    int getX()
    {
        return x;
    }
};

class FirstClass:protected BaseClass
{
private:
    int y;
public:
    FirstClass(int y, int x):BaseClass(x)
    {
        cout << "\n FirstClass(parameters) called." << endl;
        this->y = y;
    }
    int getY()
    {
        return y;
    }
};

int main()
{
    BaseClass obj1;
    BaseClass obj2(100);
    cout << "\n X = " << obj2.getX() << endl;
    FirstClass obj3(200, 300);
    cout << "\n Y = " << obj3.getY() << endl;
    return 0;
}

Richard MacCutchan19-Jul-16 5:29

19-Jul-16 5:29

See Member Access Control (C++)[^].

kinderu19-Jul-16 6:31

19-Jul-16 6:31

I know the protected access specifier.
In my code I need a function into FirstClass() to call function getX() from BaseClass, and I tried but I did not succeed.

Richard MacCutchan19-Jul-16 7:02

19-Jul-16 7:02

You have been given the answer to this twice already in your original post two days ago[^]. You are trying to access an uninitialised variable in an object (obj1). Build your program and step through the code with the debugger and you will be able to see exactly what happens.

David Crow19-Jul-16 17:39

David Crow

19-Jul-16 17:39

kinderu wrote:
Can anyone tell me how can I access the x in the following statement: FirstClass obj3(200, 300);

Taken at face value, this really makes no sense. The member variable x belongs to the BaseClass class. So, are you wanting to access x in the context of obj3, or from within BaseClass, FirstClass, or main()?

As it stands right now, your code does indeed assign x a value, but then you have no code to print it (like you do for y).

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kinderu20-Jul-16 0:05

20-Jul-16 0:05

this code is what I want to achieve

C++

#include <iostream>
using namespace std;

class BaseClass
{
private:
    int x;
public:
    BaseClass()
    {
        cout << "\n BaseClass(default) called." << endl;
    }
    BaseClass(int x)
    {
        cout << "\n BaseClass(parameter) called." << endl;
        this->x = x;
    }
    int getX()
    {
        return x;
    }
};
class FirstClass:protected BaseClass
{
private:
    int y;
public:
    FirstClass(int y, int x):BaseClass(x)
    {
        cout << "\n FirstClass(parameter) called." << endl;
        this->y = y;
    }
    int getY()
    {
        return y;
    }
    int getXX()
    {
        return getX();
    }
};

int main()
{
    BaseClass obj1;
    BaseClass obj2(100);
    cout << "\n X = " << obj2.getX() << endl;
    FirstClass obj3(200, 300);
    cout << "\n Y = " << obj3.getY() << endl;
    cout << "\n X = " << obj3.getXX() << endl;
    return 0;
}

David Crow20-Jul-16 2:53

David Crow

20-Jul-16 2:53

So what's the problem?

Richard MacCutchan20-Jul-16 22:01

20-Jul-16 22:01

That should all work; what happens when you run this code?

kinderu21-Jul-16 1:31

21-Jul-16 1:31

When I run the code shows:

BaseClass(default) called.
BaseClass(parameter) called.
X = 100
BaseClass(parameter) called.
FirstClass(parameter) called.
Y = 200
X = 300

wich is ok

Richard MacCutchan21-Jul-16 1:36

Debug COM DLL from ASP.Net

21-Jul-16 1:36

Excellent, you have solved your problem.

Member 741142218-Jul-16 2:00

Member 7411422

18-Jul-16 2:00

Hi,
I want to debug COM dll solution through another ASP.Net solution (IIS).

Solution A - COM dll which outputs 4 com dll's.
Solution B - ASP.Net which access, solution A COM dll's. This solution was hosted in IIS

Solution B I able to debug through Visualstudio->Debug->attachtoprocess->w3wp.exe
But when solution B calls COM dll which is from solution A , I cannot debug Solution A(COM Dll).
Please suggest solution for debugging.

(Usually I debug the dll solution through
VS->Project->properties->Debugging->command->setting target exe path. But here it is asp.net solution, so I don't know what to give in Target exe path)

Inheritance classes

kinderu16-Jul-16 20:32