C / C++ / MFC

<br />
BOOL CWnd::Attach(HWND hWndNew)<br />
{<br />
    ASSERT(m_hWnd == NULL);     // only attach once, detach on destroy<br />
    ASSERT(FromHandlePermanent(hWndNew) == NULL);<br />
        // must not already be in permanent map<br />
<br />
    if (hWndNew == NULL)<br />
        return FALSE;<br />
<br />
    CHandleMap* pMap = afxMapHWND(TRUE); // create map if not exist<br />
    ASSERT(pMap != NULL);<br />
<br />
    pMap->SetPermanent(m_hWnd = hWndNew, this);<br />
<br />
#ifndef _AFX_NO_OCC_SUPPORT<br />
    AttachControlSite(pMap);<br />
#endif<br />
<br />
    return TRUE;<br />
}<br />

GetParent()->GetDlgItem(IDOK)->SetWindowText("My new label");

	<br />
CFileDialog dlg(FALSE, "*.imp", NULL, NULL, szFilter);<br />
CWnd *wnd = dlg.GetDlgItem(IDOK);<br />

while (moreWorkToDo()) {
  doSomeWork();
  pumpMessageQueue();
  if (cancelled()) {
     break;
  }
}

void pumpMessageQueue()
{
  MSG   msg;
  while (::PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE)) {
        AfxGetThread()->PumpMessage();
  }
}