设置对话框（Dialog）的背景色

重载WM＿CTLCOLOR响应函数
HBRUSH CDlgTest::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
//HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

// TODO: Change any attributes of the DC here
switch (nCtlColor)
{
case CTLCOLOR_DLG:
{
CBrush* back_brush;
COLORREF color;
color = RGB(255,255,255);
back_brush = new CBrush(color);
return (HBRUSH) (back_brush->m_hObject);
}
}
return(CDialog::OnCtlColor(pDC, pWnd, nCtlColor));
// TODO: Return a different brush if the default is not desired
//return hbr;
}