mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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120 lines
5.3 KiB
HTML
120 lines
5.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/findfirst.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - f_findfirst</title>
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</head>
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<body>
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<div class="para func">
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<h2>f_findfirst</h2>
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<p>The f_findfirst function searches a directroy for an item.</p>
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<pre>
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FRESULT f_findfirst (
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DIR* <span class="arg">dp</span>, <span class="c">/* [OUT] Poninter to the directory object */</span>
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FILINFO* <span class="arg">fno</span>, <span class="c">/* [OUT] Pointer to the file information structure */</span>
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const TCHAR* <span class="arg">path</span>, <span class="c">/* [IN] Pointer to the directory name to be opened */</span>
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const TCHAR* <span class="arg">pattern</span> <span class="c">/* [IN] Pointer to the matching pattern string */</span>
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);
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</pre>
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</div>
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<div class="para arg">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>dp</dt>
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<dd>Pointer to the blank directory object.</dd>
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<dt>fno</dt>
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<dd>Pointer to the file information structure to store the information about the found item.</dd>
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<dt>path</dt>
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<dd>Pointer to the null-terminated string that specifies the <a href="filename.html">directory name</a> to be opened.</dd>
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<dt>pattern</dt>
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<dd>Pointer to the null-terminated string that specifies the name matching pattern to be searched for. It is referred by also subsequent <tt>f_findnext</tt> function, so that the string must be valid while the successive function calls.</dd>
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</dl>
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</div>
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<div class="para ret">
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<h4>Return Values</h4>
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<p>
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<a href="rc.html#ok">FR_OK</a>,
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<a href="rc.html#de">FR_DISK_ERR</a>,
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<a href="rc.html#ie">FR_INT_ERR</a>,
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<a href="rc.html#nr">FR_NOT_READY</a>,
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<a href="rc.html#np">FR_NO_PATH</a>,
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<a href="rc.html#in">FR_INVALID_NAME</a>,
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<a href="rc.html#io">FR_INVALID_OBJECT</a>,
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<a href="rc.html#id">FR_INVALID_DRIVE</a>,
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<a href="rc.html#ne">FR_NOT_ENABLED</a>,
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<a href="rc.html#ns">FR_NO_FILESYSTEM</a>,
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<a href="rc.html#tm">FR_TIMEOUT</a>,
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<a href="rc.html#nc">FR_NOT_ENOUGH_CORE</a>,
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<a href="rc.html#tf">FR_TOO_MANY_OPEN_FILES</a>
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</p>
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</div>
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<div class="para desc">
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<h4>Description</h4>
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<p>After the directory specified by <tt class="arg">path</tt> could be opened, it starts to search the directory for the item with a name specified by <tt class="arg">pattern</tt>. If found, the information about the object is stored into the file information structure. For more information about file information structure, refer to <a href="readdir.html"><tt>f_readdir</tt></a> function.</p>
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<p>The matching pattern can contain wildcard characters (<tt>?</tt> and <tt>*</tt>). A <tt>?</tt> matches an any character and an <tt>*</tt> matches an any string in length of zero or longer. At LFN configuration, both names of the item, SFN and LFN (if exist), are tested. In this revision, there are some differences listed below between FatFs and standard systems in matching condition.</p>
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<ul>
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<li><tt>"*.*"</tt> never matches any name without extension. (It matches all names at the standard systems)</li>
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<li>Any pattern terminated with a period never matches any name. (It matches the names without extensiton at the standard systems)</li>
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<li><a href="filename.html#case">DBCS extended characters</a> are compared in case-sensitive at LFN with non-Unicode configuration.</li>
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</ul>
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</div>
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<div class="para comp">
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<h4>QuickInfo</h4>
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<p>This is a wrapper function of <a href="opendir.html"><tt>f_opendir</tt></a> and <a href="readdir.html"><tt>f_readdir</tt></a> function. Available when <tt>_USE_FIND == 1</tt> and <tt>_FS_MINIMIZE <= 1</tt>.</p>
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</div>
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<div class="para use">
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<h4>Examples</h4>
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<pre>
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<span class="c">/* Search a directory for objects and display it */</span>
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void find_image (void)
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{
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FRESULT fr; <span class="c">/* Return value */</span>
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DIR dj; <span class="c">/* Directory search object */</span>
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FILINFO fno; <span class="c">/* File information */</span>
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<span class="k">#if</span> _USE_LFN
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char lfn[_MAX_LFN + 1];
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fno.lfname = lfn;
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fno.lfsize = _MAX_LFN + 1;
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<span class="k">#endif</span>
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fr = f_findfirst(&dj, &fno, "", "dsc*.jpg"); <span class="c">/* Start to search for JPEG files with the name started by "dsc" */</span>
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while (fr == FR_OK && fno.fname[0]) { <span class="c">/* Repeat while an item is found */</span>
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<span class="k">#if</span> _USE_LFN
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printf("%-12s %s\n", fno.fname, fno.lfname);<span class="c">/* Display the item name */</span>
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<span class="k">#else</span>
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printf("%s\n", fno.fname);
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<span class="k">#endif</span>
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fr = f_findnext(&dj, &fno); <span class="c">/* Search for next item */</span>
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}
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f_closedir(&dj);
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}
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</pre>
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</div>
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<div class="para ref">
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<h4>See Also</h4>
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<p><tt><a href="findnext.html">f_findnext</a>, <a href="closedir.html">f_closedir</a>, <a href="sdir.html">DIR</a>, <a href="sfileinfo.html">FILINFO</a></tt></p>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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