151 lines
5.1 KiB
TeX
151 lines
5.1 KiB
TeX
\section{Built-in Module \sectcode{ctb}}
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\label{module-ctb}
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\bimodindex{ctb}
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\renewcommand{\indexsubitem}{(in module ctb)}
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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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\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 \var{Read} and \var{Write}
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methods.
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\end{datadesc}
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\begin{datadesc}{cmFlagsEOM}
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End-of-message flag for \var{Read} and \var{Write}.
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\end{datadesc}
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\begin{datadesc}{choose*}
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Values returned by \var{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 \var{Status}.
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\end{datadesc}
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\begin{funcdesc}{available}{}
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Return 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} will result in default buffer sizes.
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\end{funcdesc}
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\subsection{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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\renewcommand{\indexsubitem}{(connection object attribute)}
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\begin{datadesc}{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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{\em 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{datadesc}
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\renewcommand{\indexsubitem}{(connection object method)}
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\begin{funcdesc}{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{funcdesc}
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\begin{funcdesc}{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{funcdesc}
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\begin{funcdesc}{accept}{yesno}
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Accept (when \var{yesno} is non-zero) or reject an incoming call after
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\var{Listen} returned.
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\end{funcdesc}
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\begin{funcdesc}{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{funcdesc}
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\begin{funcdesc}{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 \var{cmData}, \var{cmCntl} or
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\var{cmAttn}). Return a 2-tuple:\ the data read and the end-of-message
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flag.
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\end{funcdesc}
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\begin{funcdesc}{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 \var{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{funcdesc}
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\begin{funcdesc}{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 \var{CMNew}), \var{flags} is a set of bits describing the state
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of the connection.
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\end{funcdesc}
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\begin{funcdesc}{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{funcdesc}
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\begin{funcdesc}{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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\var{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{funcdesc}
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\begin{funcdesc}{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 \var{choose*} constants) will
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indicate this.
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\end{funcdesc}
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\begin{funcdesc}{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{funcdesc}
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\begin{funcdesc}{Abort}{}
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Abort an outstanding asynchronous \var{Open} or \var{Listen}.
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\end{funcdesc}
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\begin{funcdesc}{Reset}{}
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Reset a connection. Exact meaning depends on the tool.
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\end{funcdesc}
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\begin{funcdesc}{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 depend on the tool in
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use.
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\end{funcdesc}
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