(in a CListCtrl class)

    HWND hwHeaderCtrl;
    int nColumnCount;

    hwHeaderCtrl = (HWND)this->SendMessage(LVM_GETHEADER, 0, 0);
    if (hwHeaderCtrl != NULL)
    {
        nColumnCount = ::SendMessage(hwHeaderCtrl, HDM_GETITEMCOUNT, 0, 0);
    }

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