+real position in the stream.
+
+\membersection{wxStreamBase::OnSysWrite}
+
+\func{size\_t}{OnSysWrite}{\param{void *}{buffer}, \param{size\_t}{ bufsize}}
+
+See \helpref{OnSysRead}{wxstreambaseonsysread}.
+
+\membersection{wxStreamBase::StreamSize}
+
+\constfunc{size\_t}{StreamSize}{\void}
+
+This function returns the size of the stream. For example, for a file it is the size of
+the file).
+
+\wxheading{Warning}
+
+There are streams which do not have size by definition, such as socket streams.
+In that cases, StreamSize returns an invalid size represented by
+
+\begin{verbatim}
+~(size_t)0
+\end{verbatim}