以下一段代码为什么没有反应

[shankaipingo]

BOOL CPetWindowDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

//得到最顶层的那个窗体的句柄

HWND hwndTop=::GetTopWindow(NULL);
RECT r;


HDC cc=::GetDC(hwndTop);
::GetClientRect(hwndTop,&r);

//在窗体上写字
TextOut(cc, r.left, r.top, "Defenestration can be hazardous", 23);



// TODO: Add extra initialization here

return TRUE; // return TRUE unless you set the focus to a control
}

没有写出字来

[飞哥]

句柄不对·

[star119119]

::GetTopWindow(NULL);

If the function succeeds, the return value is a handle to the child window at the top of the Z order. If the specified window has no child windows, the return value is NULL.

a handle of child window,not main window.