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