Autocad error/warning messages

[mftbrothers]

if there any way to get warnings/errors autocad send to command line.
i.e. when i select objects using vba there is no error. But cannot select objects
but when i manually write select wp coordinates(10 line) i get
such errors:

Invalid point, polygon segments cannot intersect.
Invalid point, polygon segment is zero length.

My vba dont show such errors/warnings.
How can i get such errors?is there error check for autocad warnings???

[mftbrothers]

When i run a vba script program encounters some errors but i cant see them(program skiping such errors). When i do same thing manually i got such errors:
Invalid point, polygon segments cannot intersect.
Invalid point, polygon segment is zero length.
how can i detect them?