A formula for the resonance field along an arbitrary direction in a film of a cubic crystal, which possesses magnetocrystalline anisotropy (K1) as well as an uniaxial anisotropy (Ku) with the easy axis normal to the film plane, has been derived.On the basis of this formula, a method for the simultaneous measurement of (Ku) and (K1) is proposed. An example for an (111) film is considered specifically.