// MFC 版本
CEdit* pEdit = GetDlgItem(IDC_EDIT1);
ASSERT(pEdit && pEdit->GetSafeHwnd());
pEdit->SetSel(-1);
pEdit->ReplaceSel(_T("Hello, World!"));
// SDK 版本
HWND hEdit = ::GetDlgItem(hWnd, IDC_EDIT1);
ASSERT(hEdit);
::SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
::SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(_T("Hello, World!")));
