Mercurial > cpython-lru_cache-weakref
annotate Doc/mac/libmacos.tex @ 4566:6403c94de50d legacy-trunk
Added safeguard against failure in __del__.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 27 Nov 1996 19:39:58 +0000 |
| parents | 4cef23e1dcca |
| children | 3468ea8645ca |
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| 2995 | 1 \section{Built-in Module \sectcode{MacOS}} |
| 2 \bimodindex{MacOS} | |
| 3 | |
| 4 \renewcommand{\indexsubitem}{(in module MacOS)} | |
| 5 | |
| 6 This module provides access to MacOS specific functionality in the | |
| 7 python interpreter, such as how the interpreter eventloop functions | |
| 8 and the like. Use with care. | |
| 9 | |
| 10 Note the capitalisation of the module name, this is a historical | |
| 11 artefact. | |
| 12 | |
| 13 \begin{excdesc}{Error} | |
| 14 This exception is raised on MacOS generated errors, either from | |
| 15 functions in this module or from other mac-specific modules like the | |
| 16 toolbox interfaces. The arguments are the integer error code (the | |
| 17 \var{OSErr} value) and a textual description of the error code. | |
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18 Symbolic names for all known error codes are defined in the standard |
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19 module \var{macerrors}. |
| 2995 | 20 \end{excdesc} |
| 21 | |
| 22 \begin{funcdesc}{SetHighLevelEventHandler}{handler} | |
| 23 Pass a python function that will be called upon reception of a | |
| 24 high-level event. The previous handler is returned. The handler | |
| 25 function is called with the event as argument. | |
| 26 | |
| 27 Note that your event handler is currently only called dependably if | |
| 28 your main event loop is in \var{stdwin}. | |
| 29 \end{funcdesc} | |
| 30 | |
| 31 \begin{funcdesc}{AcceptHighLevelEvent}{} | |
| 32 Read a high-level event. The return value is a tuple \code{(sender, | |
| 33 refcon, data)}. | |
| 34 \end{funcdesc} | |
| 35 | |
| 36 \begin{funcdesc}{SetScheduleTimes}{fgi\, fgy \optional{\, bgi\, bgy}} | |
| 37 Controls how often the interpreter checks the event queue and how | |
| 38 long it will yield the processor to other processes. \var{fgi} | |
| 39 specifies after how many clicks (one click is one 60th of a second) | |
| 40 the interpreter should check the event queue, and \var{fgy} specifies | |
| 41 for how many clicks the CPU should be yielded when in the | |
| 42 foreground. The optional \var{bgi} and \var{bgy} allow you to specify | |
| 43 different values to use when python runs in the background, otherwise | |
| 44 the background values will be set the the same as the foreground | |
| 45 values. The function returns nothing. | |
| 46 | |
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47 The default values, which are based on minimal empirical testing, are 12, 1, 6 |
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48 and 2 respectively. |
| 2995 | 49 \end{funcdesc} |
| 50 | |
| 51 \begin{funcdesc}{EnableAppswitch}{onoff} | |
| 52 Enable or disable the python event loop, based on the value of | |
| 53 \var{onoff}. The old value is returned. If the event loop is disabled | |
| 54 no time is granted to other applications, checking for command-period | |
| 55 is not performed and it is impossible to switch applications. This | |
| 56 should only be used by programs providing their own complete event | |
| 57 loop. | |
| 58 | |
| 59 Note that based on the compiler used to build python it is still | |
| 60 possible to loose events even with the python event loop disabled. If | |
| 61 you have a \code{sys.stdout} window its handler will often also look | |
| 62 in the event queue. Making sure nothing is ever printed works around | |
| 63 this. | |
| 64 \end{funcdesc} | |
| 65 | |
| 66 \begin{funcdesc}{HandleEvent}{ev} | |
| 67 Pass the event record \code{ev} back to the python event loop, or | |
| 68 possibly to the handler for the \code{sys.stdout} window (based on the | |
| 69 compiler used to build python). This allows python programs that do | |
| 70 their own event handling to still have some command-period and | |
| 71 window-switching capability. | |
| 72 \end{funcdesc} | |
| 73 | |
| 74 \begin{funcdesc}{GetErrorString}{errno} | |
| 75 Return the textual description of MacOS error code \var{errno}. | |
| 76 \end{funcdesc} | |
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77 |
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78 \begin{funcdesc}{splash}{resid} |
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79 This function will put a splash window |
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80 on-screen, with the contents of the DLOG resource specified by |
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81 \code{resid}. Calling with a zero argument will remove the splash |
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82 screen. This function is useful if you want an applet to post a splash screen |
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83 early in initialization without first having to load numerous |
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84 extension modules. |
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85 \end{funcdesc} |
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86 |
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87 \begin{funcdesc}{DebugStr}{message \optional{\, object}} |
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88 Drop to the low-level debugger with message \var{message}. The |
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89 optional \var{object} argument is not used, but can easily be |
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90 inspected from the debugger. |
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91 |
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92 Note that you should use this function with extreme care: if no |
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93 low-level debugger like MacsBug is installed this call will crash your |
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94 system. It is intended mainly for developers of Python extension |
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95 modules. |
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96 \end{funcdesc} |
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97 |
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98 \begin{funcdesc}{openrf}{name \optional{\, mode}} |
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99 Open the resource fork of a file. Arguments are the same as for the |
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100 builtin function \code{open}. The object returned has file-like |
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101 semantics, but it is not a python file object, so there may be subtle |
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102 differences. |
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103 \end{funcdesc} |