Visual C++ and MFC Programming 2nd Edition

Chapter 20: List-Based Controls Visual C++ and MFC Fundamentals

void CControlsDlg::OnBnClickedRdoDontknow()

{

// TODO: Add your control notification handler code here

UpdateChoice();

}

Practical Learning: Implementing Radio Buttons

1. When the clerk clicks a Container radio button, we will change the right picture
   based on the selected container.
   In the header file of the Customer Order dialog box class, declare a member variable
   named ContSelected and of type int

private:

int Selected;

};

2. Generate the WM_PAINT message of the dialog box and implement it as follows:

void CIceScreamOrderDlg::OnPaint()

{

CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here

// Do not call CDialog::OnPaint() for painting messages

CBitmap Bmp;

switch(Selected)

{

case 0:

Bmp.LoadBitmap(IDB_CUP);

m_Picture.SetBitmap(Bmp);

break;

case 1:

Bmp.LoadBitmap(IDB_CONE);

m_Picture.SetBitmap(Bmp);

break;

case 2:

Bmp.LoadBitmap(IDB_BOWL);

m_Picture.SetBitmap(Bmp);

break;

}

}

3. On the dialog box, right-click the Cup radio button
   If you are using MSVC 6, click Events
   If you are using MSVC 7, click Add Event Handler


4. Select the Message Type as BN_CLICKED. Accept the name of the event as
   OnBnClickedContainer


5. If you are using MSVC 6, click Add Handler, accept the name and click Edit
   Existing
   If using MSVC 7, click Edit Code


6. In the same way, add a BN_CLICKED event for the Cone and the Bowl radio
   buttons


7. Implement the events as follows:
   void CIceScreamOrderDlg::OnBnClickedContainer()