/* IDC_CHECK_1: check box's ID */
CButton* bCheck1Obj=(CButton*)GetDlgItem(IDC_CHECK_1);
if(bCheck1Obj->GetCheck() == BST_CHECKED)
{
/* current state is checked. */
}
else if(bCheck1Obj->GetCheck() == BST_UNCHECKED)
{
/* current state is un-checked. */
}
else
{