104 lines
4.1 KiB
TeX
104 lines
4.1 KiB
TeX
\section{Built-in Module \sectcode{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}{SetHighLevelEventHandler}{handler}
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Pass a python function that will be called upon reception of a
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high-level event. The previous handler is returned. The handler
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function is called with the event as argument.
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Note that your event handler is currently only called dependably if
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your main event loop is in \var{stdwin}.
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\end{funcdesc}
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\begin{funcdesc}{AcceptHighLevelEvent}{}
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Read a high-level event. The return value is a tuple \code{(sender,
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refcon, data)}.
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\end{funcdesc}
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\begin{funcdesc}{SetScheduleTimes}{fgi\, fgy \optional{\, bgi\, bgy}}
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Controls how often the interpreter checks the event queue and how
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long it will yield the processor to other processes. \var{fgi}
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specifies after how many clicks (one click is one 60th of a second)
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the interpreter should check the event queue, and \var{fgy} specifies
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for how many clicks the CPU should be yielded when in the
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foreground. The optional \var{bgi} and \var{bgy} allow you to specify
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different values to use when python runs in the background, otherwise
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the background values will be set the the same as the foreground
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values. The function returns nothing.
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The default values, which are based on minimal empirical testing, are 12, 1, 6
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and 2 respectively.
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\end{funcdesc}
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\begin{funcdesc}{EnableAppswitch}{onoff}
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Enable or disable the python event loop, based on the value of
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\var{onoff}. The old value is returned. If the event loop is disabled
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no time is granted to other applications, checking for command-period
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is not performed and it is impossible to switch applications. This
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should only be used by programs providing their own complete event
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loop.
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Note that based on the compiler used to build python it is still
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possible to loose events even with the python event loop disabled. If
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you have a \code{sys.stdout} window its handler will often also look
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in the event queue. Making sure nothing is ever printed works around
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this.
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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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\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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