窗口当次强制置顶

在实际开发中，可能需要当次把窗口置顶。使用BringWindowToTop发现效果不是很理想，有时候不能置顶。

BOOL ForceForegroundWindow(HWND hWnd)
{
  if (!hWnd || !::IsWindow(hWnd))
    return FALSE;

  HWND hWndCurrentWindow = ::GetForegroundWindow();
  if (hWndCurrentWindow == NULL)
  {
    return ::SetForegroundWindow(hWnd);
  }

  DWORD dwCurProcId, dwCurThreadId = ::GetWindowThreadProcessId(hWndCurrentWindow, &dwCurProcId);
  DWORD dwHWndProcId;
  ::GetWindowThreadProcessId(hWnd, &dwHWndProcId);

  BOOL bReturn = FALSE;

  if (dwHWndProcId == dwCurProcId)
  {
    bReturn = ::SetForegroundWindow(hWnd);
  }
  else
  {
    DWORD dwMyThreadId = ::GetCurrentThreadId();

    if (::AttachThreadInput(dwMyThreadId, dwCurThreadId, TRUE))
    {
      bReturn = ::SetForegroundWindow(hWnd);
      ::AttachThreadInput(dwMyThreadId, dwCurThreadId, FALSE);
    }
    else
    {
      bReturn = ::SetForegroundWindow(hWnd);
    }
  }

  return bReturn;
}