mirror of https://github.com/python/cpython.git
95 lines
4.0 KiB
TeX
95 lines
4.0 KiB
TeX
\section{Built-in Module \sectcode{MacOS}}
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\label{module-MacOS}
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\bimodindex{MacOS}
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\renewcommand{\indexsubitem}{(in module MacOS)}
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This module provides access to MacOS specific functionality in the
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python interpreter, such as how the interpreter eventloop functions
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and the like. Use with care.
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Note the capitalisation of the module name, this is a historical
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artefact.
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\begin{excdesc}{Error}
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This exception is raised on MacOS generated errors, either from
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functions in this module or from other mac-specific modules like the
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toolbox interfaces. The arguments are the integer error code (the
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\var{OSErr} value) and a textual description of the error code.
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Symbolic names for all known error codes are defined in the standard
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module \var{macerrors}.
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\end{excdesc}
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\begin{funcdesc}{SetEventHandler}{handler}
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In the inner interpreter loop Python will occasionally check for events,
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unless disabled with \var{ScheduleParams}. With this function you
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can pass a Python event-handler function that will be called if an event
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is available. The event is passed as parameter and the function should return
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non-zero if the event has been fully processed, otherwise event processing
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continues (by passing the event to the console window package, for instance).
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Call SetEventHandler without parameter to clear the event handler. Setting
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an eventhandler while one is already set is an error.
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\end{funcdesc}
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\begin{funcdesc}{SchedParams}{\optional{doint\, evtmask\, besocial\,
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interval\, bgyield}}
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Influence the interpreter inner loop event handling. \var{Interval}
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specifies how often (in seconds, floating point) the interpreter
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should enter the event processing code. When true, \var{doint} causes
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interrupt (command-dot) checking to be done. \var{Evtmask} tells the
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interpreter to do event processing for events in the mask (redraws,
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mouseclicks to switch to other applications, etc). \bar{Besocial}
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gives other processes a chance to run. They are granted minimal
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runtime when Python is in the foreground and \var{bgyield} seconds per
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\var{interval} when Python runs in the background.
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All parameters are optional, and default to the current value. The return
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value of this function is a tuple with the old values of these options.
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Initial defaults are that all processing is enabled, checking is done every
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quarter second and the CPU is given up for a quarter second when in the
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background.
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\end{funcdesc}
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\begin{funcdesc}{HandleEvent}{ev}
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Pass the event record \code{ev} back to the python event loop, or
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possibly to the handler for the \code{sys.stdout} window (based on the
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compiler used to build python). This allows python programs that do
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their own event handling to still have some command-period and
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window-switching capability.
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If you attempt to call this function from an event handler set through
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\code{SetEventHandler} you will get an exception.
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\end{funcdesc}
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\begin{funcdesc}{GetErrorString}{errno}
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Return the textual description of MacOS error code \var{errno}.
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\end{funcdesc}
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\begin{funcdesc}{splash}{resid}
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This function will put a splash window
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on-screen, with the contents of the DLOG resource specified by
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\code{resid}. Calling with a zero argument will remove the splash
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screen. This function is useful if you want an applet to post a splash screen
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early in initialization without first having to load numerous
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extension modules.
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\end{funcdesc}
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\begin{funcdesc}{DebugStr}{message \optional{\, object}}
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Drop to the low-level debugger with message \var{message}. The
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optional \var{object} argument is not used, but can easily be
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inspected from the debugger.
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Note that you should use this function with extreme care: if no
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low-level debugger like MacsBug is installed this call will crash your
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system. It is intended mainly for developers of Python extension
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modules.
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\end{funcdesc}
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\begin{funcdesc}{openrf}{name \optional{\, mode}}
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Open the resource fork of a file. Arguments are the same as for the
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builtin function \code{open}. The object returned has file-like
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semantics, but it is not a python file object, so there may be subtle
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differences.
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\end{funcdesc}
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