The
CancelMessage
method
is
used
to
cancel
asynchronous
messages
from
the
send
queue.
Specific
messages
can
be
cancelled
by
specifying
the
ID
assigned
to
them
by
TDx_Play::SendEx().
Partially
sent
messages
cannot
be
cancelled,
a
group
message
that
has
already
been
sent
to
at
least
one
group
member
is
regarded
to
be
partially
sent.
A
DPMSG_SENDCOMPLETE
system
message
is
generated
to
indicate
successful
cancellation.