  We report on the results of directional point-contact Andreev-reflection
(PCAR) measurements in Ba(Fe_{1-x}Co_x)2As2 single crystals and epitaxial
c-axis oriented films with x = 0.08 as well as in Ca(Fe_{1-x}Co_x)2As2 single
crystals with x = 0.06. The PCAR spectra are analyzed within the two-band 3D
version of the Blonder-Tinkham-Klapwijk model for Andreev reflection we
recently developed, and that makes use of an analytical expression for the
Fermi surface that mimics the one calculated within the density-functional
theory (DFT). The spectra in Ca(Fe_{0.94}Co_{0.06})2As2 unambiguously
demonstrate the presence of nodes or zeros in the small gap. In
Ba(Fe_{0.92}Co_{0.08})2As2, the ab-plane spectra in single crystals can be
fitted by assuming two nodeless gaps, but this model fails to fit the c-axis
ones in epitaxial films. All these results are discussed in comparison with
recent theoretical predictions about the occurrence of accidental 3D nodes and
the presence of "hot spots" in the gaps of 122 compounds.
