?
klasse felnders, grosse danke
klappt !!
habs nun so:
nIndex = SendMessage( GetDlgItem( hWnd , IDC_KuFirmenname ) , CB_GETCURSEL , 0 , 0 );
SendMessage( GetDlgItem( hWnd , IDC_KuFirmenname ) , CB_GETLBTEXT , nIndex , (LPARAM)szFirma );
wsprintf( szBuffer , "SELECT * FROM Kundendaten WHERE KuFirmenname = '%s'",szFirma );