MFC/C++: convert combo box entry to cstring / int

I need to convert the currently selected item from a combo box into a cstring, int, and float. What's the best way?

For example,

      int selectedIndex = myComboBox.GetCurSel();

      // convert to string, int, and float, these don't work
      CString dataString   =   myComboBox.GetItemData(selectedIndex);
      int dataInt   =   myComboBox.GetItemData(selectedIndex);
      float dataFloat   =   myComboBox.GetItemData(selectedIndex);