C / C++ / MFC

class MainWindow : public CFrameWnd
{
public:
	CButton start;
	CButton end;
	CEdit textbox;

	MainWindow()
	{
		Create(NULL, "MFC Window");
		start.Create("Start", WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, CRect(10,10,100,30), this, 1);
		end.Create("End", WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, CRect(10,40,100,60), this, 2);
		textbox.Create(ES_READONLY|ES_LEFT|ES_MULTILINE|ES_AUTOVSCROLL, CRect(10,70,100,120), this, 3);
	}
	void ButtonStart();
	void ButtonEnd();
	void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
	void OnLButtonDown(UINT nFlags, CPoint point);
	DECLARE_MESSAGE_MAP()
};

void MainWindow::ButtonStart()
{
	MessageBox("Start");
}

void MainWindow::ButtonEnd()
{
	MessageBox("End");
}

void MainWindow::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	if (nChar == VK_ESCAPE)
		MessageBox("Escape button pressed");
}

void MainWindow::OnLButtonDown(UINT nFlags, CPoint point) 
{
	MessageBox("Left button clicked");
}

BEGIN_MESSAGE_MAP(MainWindow, CFrameWnd)
	ON_BN_CLICKED(1, MainWindow::ButtonStart)
	ON_BN_CLICKED(2, MainWindow::ButtonEnd)
	ON_WM_KEYDOWN()
	ON_WM_LBUTTONDOWN()		//Map left button click to handler
END_MESSAGE_MAP()

class MyApp : public CWinApp
{
public:
	BOOL InitInstance()
	{
		m_pMainWnd = new MainWindow();
		m_pMainWnd->ShowWindow(SW_SHOW);
		return TRUE;
	}
};

MyApp theApp;