C / C++ / MFC

// like ON_MESSAGE but no return value
#define ON_MESSAGE_VOID(message, memberFxn) \
	{ message, 0, 0, 0, AfxSig_vv, \
		(AFX_PMSG)(AFX_PMSGW)(void (AFX_MSG_CALL CWnd::*)(void))&memberFxn },

HIMAGELIST CImageList::Detach()
{
HIMAGELIST hImageList = m_hImageList;
 
    if (hImageList != NULL)
        {
        CHandleMap* pMap = afxMapHIMAGELIST();
        if (pMap != NULL)
            pMap->RemoveHandle(m_hImageList);
        }
 
    m_hImageList = NULL;
    return hImageList;
}

BOOL CButtonDlg::PreTranslateMessage(MSG* pMsg) 
{
	// TODO: Add your specialized code here and/or call the base class
	if ((pMsg->message == WM_LBUTTONDOWN && pMsg->hwnd == GetDlgItem(IDC_BUTTON1)->GetSafeHwnd())
		|| pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_RETURN &&
		pMsg->hwnd == GetDlgItem(IDC_BUTTON1)->GetSafeHwnd())
//		MessageBox ("Click button", "Test");
		TRACE ("Click or push the button");

	return CDialog::PreTranslateMessage(pMsg);
}
</br>

CTestDlg::OnCommand(WPARAM wParam, LPARAM lParam)
{
    if (HIWORD(wParam) == BN_CLICKED) // a button was clicked
    {
        if (LOWORD(wParam) == myButtonID) // my button was clicked
        {
            MessageBox("Y");
            return TRUE;
        }
    }
    return CDialog::OnCommand(wParam, lParam);
}