Visual C++ and MFC Programming 2nd Edition

Visual C++ and MFC Fundamentals Chapter 2: Introduction to MFC

Here is an example:

void CExerciseDlg::OnMsgBox()

{

// TODO: Add your control notification handler code here

int Answer;

Answer = MessageBox("Due to an unknown internal error, "

"this application will now close.\n"

"Do you want to save the file before closing?",

"Regular Warning",

MB_YESNO | MB_ICONWARNING | MB_DEFBUTTON2);

if( Answer == IDNO )

return;

}