求助 通过滑动条改变对话框颜色

void CDialog_Test_5Dlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    // TODO: Add your message handler code here and/or call default
    int nID = pScrollBar->GetDlgCtrlID();
    if (nID == m_ctrR.GetDlgCtrlID()) {
        m_R = m_ctrR.GetPos();
    }
    else if (nID == m_ctrG.GetDlgCtrlID()) {
        m_G = m_ctrG.GetPos();
    }
    else if (nID == m_ctrB.GetDlgCtrlID()) {
        m_B = m_ctrB.GetPos();
    }
    else return;
   
    color = RGB(m_R, m_G, m_B);
    CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

HBRUSH CDialog_Test_5Dlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
    HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
   
    // TODO: Change any attributes of the DC here
    if (nCtlColor == CTLCOLOR_DLG) {
        m_brush.CreateSolidBrush(color);
        return (HBRUSH)m_brush;}
   
    // TODO: Return a different brush if the default is not desired
    return hbr;
}