112 lines
5.1 KiB
HTML
112 lines
5.1 KiB
HTML
<!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 <a href="sfileinfo.html">file information structure</a> 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 nul-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 items with the name specified by <tt class="arg">pattern</tt>. If the first item is found, the information about the object is stored into the file information structure <tt class="arg">fno</tt>.</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. When support of long file name is enabled, only <tt>fname[]</tt> is tested at <tt>FF_USE_FIND == 1</tt> and also <tt>altname[]</tt> is tested at <tt>FF_USE_FIND == 2</tt>. 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 while it matches any name with or without extension at the standard systems.</li>
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<li>Any pattern terminated with a period never matches any name while it matches the name 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 ANSI/OEM API.</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><a href="config.html#use_find">FF_USE_FIND</a> >= 1</tt> and <tt><a href="config.html#fs_minimize">FF_FS_MINIMIZE</a> <= 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_file (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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fr = <em>f_findfirst</em>(&dj, &fno, "", "dsc*.jpg"); <span class="c">/* Start to search for photo files */</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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printf("%s\n", fno.fname); <span class="c">/* Display the object name */</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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