C / C++ / MFC

void CSelChangeTestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CSelChangeTestDlg)
	DDX_Control(pDX, IDC_STATIC_LABEL, m_label);
	DDX_Control(pDX, IDC_COMBO1, m_combo1);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CSelChangeTestDlg, CDialog)
	//{{AFX_MSG_MAP(CSelChangeTestDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_CBN_SELCHANGE(IDC_COMBO1, OnSelchangeCombo1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

void foo()
{
  data d;
  // fill d;
  CreateThread(...,&d,...)
}

void foo()
{
  data* d=new data;
  // fill d;
  CreateThread(...,d,...)
}

MyThread(LPVOID arg)
{
  data * d=(data *)arg;
  ...
  delete d; // d no longer needed.
  ...
}

void foo()
{
  data* d=new data;
  // fill d;
  if(!CreateThread(...,d,...)){
    delete d; // no thread launched, clean up the mess ourselves
  }
}