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85 lines
8.7 KiB
HTML
85 lines
8.7 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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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>由文件或 URL 创建一个新图象。</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.imagecreatefromjpeg" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecreatefromjpeg</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecreatefromjpeg</span> — <span class="dc-title">由文件或 URL 创建一个新图象。</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagecreatefromjpeg-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>imagecreatefromjpeg</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>imagecreatefromjpeg()</strong></span>
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返回一图像标识符，代表了从给定的文件名取得的图像。
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</p>
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<div class="tip"><strong class="tip">Tip</strong><p class="simpara">如已启用<a href="filesystem.configuration.html#ini.allow_url_fopen" class="link">fopen 包装器</a>，在此函数中， URL 可作为文件名。关于如何指定文件名详见 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>。各种
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wapper 的不同功能请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>，注意其用法及其可提供的预定义变量。</p></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagecreatefromjpeg-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">filename</code></dt>
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<dd>
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<p class="para">
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JPEG 图像的路径。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imagecreatefromjpeg-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">成功后返回图象资源,失败后返回 <strong><code>FALSE</code></strong> 。</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagecreatefromjpeg-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3682">
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<p><strong>Example #1 处理创建过程中的错误</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">LoadJpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$imgname</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #FF8000">/* 尝试打开 */<br /> </span><span style="color: #0000BB">$im </span><span style="color: #007700">= @</span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$imgname</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* See if it failed */<br /> </span><span style="color: #007700">if(!</span><span style="color: #0000BB">$im</span><span style="color: #007700">)<br /> {<br /> </span><span style="color: #FF8000">/* Create a black image */<br /> </span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">150</span><span style="color: #007700">, </span><span style="color: #0000BB">30</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$bgc </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$tc </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">150</span><span style="color: #007700">, </span><span style="color: #0000BB">30</span><span style="color: #007700">, </span><span style="color: #0000BB">$bgc</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* Output an error message */<br /> </span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'Error loading ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$imgname</span><span style="color: #007700">, </span><span style="color: #0000BB">$tc</span><span style="color: #007700">);<br /> }<br /><br /> return </span><span style="color: #0000BB">$im</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type: image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$img </span><span style="color: #007700">= </span><span style="color: #0000BB">LoadJpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'bogus.image'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="mediaobject">
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<div class="imageobject">
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<img src="images/21009b70229598c6a80eef8b45bf282b-imagecreatefromjpeg.jpg" alt="例子输出：加载图片出现错误时的处理范例" width="150" height="30" />
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</div>
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</div>
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</div>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imagecreatefromjpeg-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">JPEG 支持仅在 PHP 与 GD-1.8 或更高版本一起编译时可用。</span></p></blockquote>
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<div class="warning"><strong class="warning">Warning</strong><p class="para">Windows 版本的 PHP 在 4.3.0
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版之前不支持通过此函数访问远程文件，即使已经启用 <a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">allow_url_fopen</a>.
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</p></div>
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</div>
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</div></div></div></body></html> |