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120 lines
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120 lines
5.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Wisdom Export (FFTW 3.3.10)</title>
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<meta name="description" content="Wisdom Export (FFTW 3.3.10)">
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<meta name="keywords" content="Wisdom Export (FFTW 3.3.10)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Wisdom.html" rel="up" title="Wisdom">
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<link href="Wisdom-Import.html" rel="next" title="Wisdom Import">
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<link href="Wisdom.html" rel="prev" title="Wisdom">
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</head>
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<body lang="en">
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<span id="Wisdom-Export"></span><div class="header">
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<p>
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Next: <a href="Wisdom-Import.html" accesskey="n" rel="next">Wisdom Import</a>, Previous: <a href="Wisdom.html" accesskey="p" rel="prev">Wisdom</a>, Up: <a href="Wisdom.html" accesskey="u" rel="up">Wisdom</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Wisdom-Export-1"></span><h4 class="subsection">4.7.1 Wisdom Export</h4>
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<div class="example">
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<pre class="example">int fftw_export_wisdom_to_filename(const char *filename);
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void fftw_export_wisdom_to_file(FILE *output_file);
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char *fftw_export_wisdom_to_string(void);
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void fftw_export_wisdom(void (*write_char)(char c, void *), void *data);
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</pre></div>
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<span id="index-fftw_005fexport_005fwisdom"></span>
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<span id="index-fftw_005fexport_005fwisdom_005fto_005ffilename-1"></span>
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<span id="index-fftw_005fexport_005fwisdom_005fto_005ffile"></span>
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<span id="index-fftw_005fexport_005fwisdom_005fto_005fstring"></span>
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<p>These functions allow you to export all currently accumulated wisdom
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in a form from which it can be later imported and restored, even
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during a separate run of the program. (See <a href="Words-of-Wisdom_002dSaving-Plans.html">Words of Wisdom-Saving Plans</a>.) The current store of wisdom is not affected by calling any
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of these routines.
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</p>
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<p><code>fftw_export_wisdom</code> exports the wisdom to any output
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medium, as specified by the callback function
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<code>write_char</code>. <code>write_char</code> is a <code>putc</code>-like function that
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writes the character <code>c</code> to some output; its second parameter is
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the <code>data</code> pointer passed to <code>fftw_export_wisdom</code>. For
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convenience, the following three “wrapper” routines are provided:
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</p>
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<p><code>fftw_export_wisdom_to_filename</code> writes wisdom to a file named
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<code>filename</code> (which is created or overwritten), returning <code>1</code>
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on success and <code>0</code> on failure. A lower-level function, which
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requires you to open and close the file yourself (e.g. if you want to
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write wisdom to a portion of a larger file) is
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<code>fftw_export_wisdom_to_file</code>. This writes the wisdom to the
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current position in <code>output_file</code>, which should be open with
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write permission; upon exit, the file remains open and is positioned
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at the end of the wisdom data.
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</p>
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<p><code>fftw_export_wisdom_to_string</code> returns a pointer to a
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<code>NULL</code>-terminated string holding the wisdom data. This string is
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dynamically allocated, and it is the responsibility of the caller to
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deallocate it with <code>free</code> when it is no longer needed.
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</p>
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<p>All of these routines export the wisdom in the same format, which we
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will not document here except to say that it is LISP-like ASCII text
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that is insensitive to white space.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Wisdom-Import.html" accesskey="n" rel="next">Wisdom Import</a>, Previous: <a href="Wisdom.html" accesskey="p" rel="prev">Wisdom</a>, Up: <a href="Wisdom.html" accesskey="u" rel="up">Wisdom</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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