148 lines
4.9 KiB
TeX
148 lines
4.9 KiB
TeX
\section{Built-in module \sectcode{ctb}}
|
|
\bimodindex{ctb}
|
|
\renewcommand{\indexsubitem}{(in module ctb)}
|
|
|
|
This module provides a partial interface to the Macintosh
|
|
Communications Toolbox. Currently, only Connection Manager tools are
|
|
supported.
|
|
|
|
\begin{datadesc}{error}
|
|
The exception raised on errors.
|
|
\end{datadesc}
|
|
|
|
\begin{datadesc}{cmData}
|
|
\dataline{cmCntl}
|
|
\dataline{cmAttn}
|
|
Flags for the \var{channel} argument of the \var{Read} and \var{Write}
|
|
methods.
|
|
\end{datadesc}
|
|
|
|
\begin{datadesc}{cmFlagsEOM}
|
|
End-of-message flag for \var{Read} and \var{Write}.
|
|
\end{datadesc}
|
|
|
|
\begin{datadesc}{choose*}
|
|
Values returned by \var{Choose}.
|
|
\end{datadesc}
|
|
|
|
\begin{datadesc}{cmStatus*}
|
|
Bits in the status as returned by \var{Status}.
|
|
\end{datadesc}
|
|
|
|
\begin{funcdesc}{available}{}
|
|
Returns 1 if the communication toolbox is available, zero otherwise.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{CMNew}{name\, sizes}
|
|
Create a connection object using the connection tool named
|
|
\var{name}. \var{sizes} is a 6-tuple given buffer sizes for data in,
|
|
data out, control in, control out, attention in and attention out.
|
|
Alternatively, passing \var{None} will result in default buffer sizes.
|
|
\end{funcdesc}
|
|
|
|
\subsection{connection object}
|
|
For all connection methods that take a \var{timeout} argument, a value
|
|
of \code{-1} is indefinite, meaning that the command runs to completion.
|
|
|
|
\renewcommand{\indexsubitem}{(connection object method)}
|
|
|
|
\begin{datadesc}{callback}
|
|
If this member is set to a value other than \var{None} it should point
|
|
to a function accepting a single argument (the connection
|
|
object). This will make all connection object methods work
|
|
asynchronously, with the callback routine being called upon
|
|
completion.
|
|
|
|
{\em Note:} for reasons beyond my understanding the callback routine
|
|
is never called currently. You are advised against using asynchronous
|
|
calls for the time being.
|
|
\end{datadesc}
|
|
|
|
|
|
\begin{funcdesc}{Open}{timeout}
|
|
Open an outgoing connection, waiting at most \var{timeout} seconds for
|
|
the connection to be established.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Listen}{timeout}
|
|
Wait for an incoming connection. Stop waiting after \var{timeout}
|
|
seconds. This call is only meaningful to some tools.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{accept}{yesno}
|
|
Accept (when \var{yesno} is non-zero) or reject an incoming call after
|
|
\var{Listen} returned.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Close}{timeout\, now}
|
|
Close a connection. When \var{now} is zero, the close is orderly
|
|
(i.e. outstanding output is flushed, etc) with a timeout of
|
|
\var{timeout} seconds. When \var{now} is non-zero the close is
|
|
immedeate, discarding output.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Read}{len\, chan\, timeout}
|
|
Read \var{len} bytes or until \var{timeout} seconds have passed from
|
|
the channel \var{chan} (which is one of \var{cmData}, \var{cmCntl} or
|
|
\var{cmAttn}). Returns a 2-tuple: the data read and the end-of-message
|
|
flag.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Write}{buf\, chan\, timeout\, eom}
|
|
Write \var{buf} to channel \var{chan}, aborting after \var{timeout}
|
|
seconds. When \var{eom} has the value \var{cmFlagsEOM} an
|
|
end-of-message indicator will be written after the data (if this
|
|
concept has a meaning for this communication tool). The method returns
|
|
the number of bytes written.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Status}{}
|
|
Return connection status as the 2-tuple \code{(sizes,
|
|
flags)}. \var{Sizes} is a 6-tuple giving the actual buffer sizes used
|
|
(see \var{CMNew}), \var{flags} is a set of bits describing the state
|
|
of the connection.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{GetConfig}{}
|
|
Return the configuration string of the communication tool. These
|
|
configuration strings are tool-dependent, but usually easily parsed
|
|
and modified.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{SetConfig}{str}
|
|
Set the configuration string for the tool. The strings are parsed
|
|
left-to-right, with later values taking precedence. This means
|
|
individual configuration parameters can be modified by simply appending
|
|
something like \code{'baud 4800'} to the end of the string returned by
|
|
\var{GetConfig} and passing that to this method. The method returns
|
|
the number of characters actually parsed by the tool before it
|
|
encountered an error (or completed successfully).
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Choose}{}
|
|
Present the user with a dialog to choose a communication tool and
|
|
configure it. If there is an outstanding connection some choices (like
|
|
selecting a different tool) may cause the connection to be
|
|
aborted. The return value (one of the \var{choose*} constants) will
|
|
indicate this.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Idle}{}
|
|
Give the tool a chance to use the processor. You should call this
|
|
method regularly.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Abort}{}
|
|
Abort an outstanding asynchronous \var{Open} or \var{Listen}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Reset}{}
|
|
Reset a connection. Exact meaning depends on the tool.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Break}{length}
|
|
Send a break. Whether this means anything, what it means and
|
|
interpretation of the \var{length} parameter depend on the tool in
|
|
use.
|
|
\end{funcdesc}
|