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Current knowledge about stellar magnetic fields relies almost entirely oncircular polarization observations. Few objects have been observed in all fourStokes parameters. The magnetic Ap star HD 24712 (DO Eri, HR 1217) was recentlyobserved in the Stokes IQUV parameters with the HARPSpol instrument at the3.6-m ESO telescope as part of our project at investigating Ap stars in allfour Stokes parameters. The resulting spectra have dense phase coverage,resolving power > 10^5, and S/N ratio of 300-600. These are the highest qualityfull Stokes observations obtained for any star other than the Sun.  We present preliminary results from magnetic Doppler imaging of HD 24712.This analysis is the first step towards obtaining detailed 3-D maps of magneticfields and abundance structures for HD 24712 and other Ap stars that wecurrently observe with HARPSpol.

Magnetic fields of Ap stars from the full Stokes spectropolarimetric observations