C / C++ / MFC

<br />
#include AtlImage.h<br />
CImage m_Image;<br />
m_Image.Load("c:\\0.jpg");<br />
....<br />
void CAnswerDlg::OnPaint() <br />
{<br />
CPaintDC dc(this);<br />
m_Image.BitBlt(dc.m_hDC,0,0,640,480,0,0);<br />
}<br />

sawerr wrote:

So i understand that we can not reach them from derived class.

Zac Howland wrote:

It is more like copying every member of the base class into the child class, but putting it all under the private keyword. The child class can see (that is call) the base class' methods, but any outsiders would only be able to call the child class' public methods.

Nemanja Trifunovic wrote:

Not really. OP got it right, just used protected in his sample.

lass Wilma {
protected:
void fredCallsWilma()
{
std::cout << "Wilma::fredCallsWilma()\n";
wilmaCallsFred();
}
virtual void wilmaCallsFred() = 0; // A pure virtual function
};

class Fred : private Wilma {
public:
void barney()
{
std::cout << "Fred::barney()\n";
Wilma::fredCallsWilma(); //this can reach private function
}
protected:
virtual void wilmaCallsFred()
{
std::cout << "Fred::wilmaCallsFred()\n";
}
};

also
class D_prot : protected B {
public:
using B::f; // Note: Not using B::f(int,float)
}

#include <iostream>

using namespace std;

class Base
{
public:
        Base()          { cout << "Base::Base()" << endl; }
        virtual ~Base() { cout << "Base::~Base()" << endl; }

        void Print()    { cout << "Base::Print()" << endl; }
};

class Child : private Base
{
public:
        Child()         { cout << "Child::Child()" << endl; }
        virtual ~Child(){ cout << "Child::~Child()" << endl; }

        void MyPrint()
        {
                cout << "Child::MyPrint()" << endl;
                Print();        // call base class' print function
        }
};

int main()
{
        Child c;
        c.MyPrint();
        // the following line would produce an error if uncommented
//        c.Print();        // cannot access private memver of Child
}

Nemanja Trifunovic wrote:

From the outsider's point of view it is correct, but the child class cannot access non-public members of base, and if you copy every member of the base to child's private section, all of them would be accessible from the child.

Javagal Srinath wrote:

Can anybody tell me how to put a progress bar in an application

Galatei wrote:

Open file dialog box is not designed for such functionality, it is common dialog box, though it is not impossible.