绘制彩色按钮

void CColorButtonDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
 // TODO: Add your message handler code here and/or call default
 if ( nIDCtl == IDC_BTN_COLOR)
 {
  CDC dc;
  CRect rect;
  dc.Attach(lpDrawItemStruct->hDC);
  rect = lpDrawItemStruct->rcItem;
  dc.Draw3dRect(&rect , RGB(255 , 255 , 0) ,RGB(0 ,0 ,0));
  dc.FillSolidRect(&rect , RGB(100 , 100 , 255));

  UINT state = lpDrawItemStruct->itemState;
  if (state & ODS_SELECTED)
  {
   dc.DrawEdge(&rect , EDGE_SUNKEN , BF_RECT);
  }
  else
  {
   dc.DrawEdge(&rect , EDGE_RAISED , BF_RECT);
  }

  dc.SetBkColor(RGB(100 , 100 , 255));
  dc.SetTextColor(RGB(255 , 0 ,0 ));

  TCHAR buffer[MAX_PATH];
  ZeroMemory (buffer , MAX_PATH);
  ::GetWindowText(lpDrawItemStruct->hwndItem , buffer , MAX_PATH);
  dc.DrawText(buffer , &rect , DT_CENTER | DT_VCENTER | DT_SINGLELINE);
  dc.Detach();
 }

 CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);
}