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103 lines
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103 lines
13 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>将二进制 IPTC 数据嵌入到一幅 JPEG 图像中</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.iptcembed" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">iptcembed</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">iptcembed</span> — <span class="dc-title">将二进制 IPTC 数据嵌入到一幅 JPEG 图像中</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.iptcembed-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>iptcembed</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$iptcdata</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$jpeg_file_name</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$spool</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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Embeds binary IPTC data into a JPEG image.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.iptcembed-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">iptcdata</code></dt>
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<dd>
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<p class="para">
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The data to be written.
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</p>
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</dd>
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<dt>
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<code class="parameter">jpeg_file_name</code></dt>
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<dd>
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<p class="para">
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Path to the JPEG image.
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</p>
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</dd>
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<dt>
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<code class="parameter">spool</code></dt>
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<dd>
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<p class="para">
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Spool flag. If the spool flag is over 2 then the JPEG will be
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returned as a string.
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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.iptcembed-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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If success and spool flag is lower than 2 then the JPEG will not be
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returned as a string, <strong><code>FALSE</code></strong> on errors.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.iptcembed-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3748">
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<p><strong>Example #1 Embedding IPTC data into a JPEG</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 /><br /></span><span style="color: #FF8000">// iptc_make_tag() function by Thies C. Arntzen<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">iptc_make_tag</span><span style="color: #007700">(</span><span style="color: #0000BB">$rec</span><span style="color: #007700">, </span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$value</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #0000BB">$length </span><span style="color: #007700">= </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$value</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$retval </span><span style="color: #007700">= </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">0x1C</span><span style="color: #007700">) . </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$rec</span><span style="color: #007700">) . </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);<br /><br /> if(</span><span style="color: #0000BB">$length </span><span style="color: #007700">< </span><span style="color: #0000BB">0x8000</span><span style="color: #007700">)<br /> {<br /> </span><span style="color: #0000BB">$retval </span><span style="color: #007700">.= </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$length </span><span style="color: #007700">>> </span><span style="color: #0000BB">8</span><span style="color: #007700">) . </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$length </span><span style="color: #007700">& </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">);<br /> }<br /> else<br /> {<br /> </span><span style="color: #0000BB">$retval </span><span style="color: #007700">.= </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">0x80</span><span style="color: #007700">) . <br /> </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">0x04</span><span style="color: #007700">) . <br /> </span><span style="color: #0000BB">chr</span><span style="color: #007700">((</span><span style="color: #0000BB">$length </span><span style="color: #007700">>> </span><span style="color: #0000BB">24</span><span style="color: #007700">) & </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">) . <br /> </span><span style="color: #0000BB">chr</span><span style="color: #007700">((</span><span style="color: #0000BB">$length </span><span style="color: #007700">>> </span><span style="color: #0000BB">16</span><span style="color: #007700">) & </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">) . <br /> </span><span style="color: #0000BB">chr</span><span style="color: #007700">((</span><span style="color: #0000BB">$length </span><span style="color: #007700">>> </span><span style="color: #0000BB">8</span><span style="color: #007700">) & </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">) . <br /> </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$length </span><span style="color: #007700">& </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">);<br /> }<br /><br /> return </span><span style="color: #0000BB">$retval </span><span style="color: #007700">. </span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Path to jpeg file<br /></span><span style="color: #0000BB">$path </span><span style="color: #007700">= </span><span style="color: #DD0000">'./phplogo.jpg'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// We need to check if theres any IPTC data in the jpeg image. If there is then <br />// bail out because we cannot embed any image that already has some IPTC data!<br /></span><span style="color: #0000BB">$image </span><span style="color: #007700">= </span><span style="color: #0000BB">getimagesize</span><span style="color: #007700">(</span><span style="color: #0000BB">$path</span><span style="color: #007700">, </span><span style="color: #0000BB">$info</span><span style="color: #007700">);<br /><br />if(isset(</span><span style="color: #0000BB">$info</span><span style="color: #007700">[</span><span style="color: #DD0000">'APP13'</span><span style="color: #007700">]))<br />{<br /> die(</span><span style="color: #DD0000">'Error: IPTC data found in source image, cannot continue'</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Set the IPTC tags<br /></span><span style="color: #0000BB">$iptc </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'2#120' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'Test image'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'2#116' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'Copyright 2008-2009, The PHP Group'<br /></span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Convert the IPTC tags into binary code<br /></span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #DD0000">''</span><span style="color: #007700">;<br /><br />foreach(</span><span style="color: #0000BB">$iptc </span><span style="color: #007700">as </span><span style="color: #0000BB">$tag </span><span style="color: #007700">=> </span><span style="color: #0000BB">$string</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #0000BB">$tag </span><span style="color: #007700">= </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">$tag</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$data </span><span style="color: #007700">.= </span><span style="color: #0000BB">iptc_make_tag</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">$tag</span><span style="color: #007700">, </span><span style="color: #0000BB">$string</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Embed the IPTC data<br /></span><span style="color: #0000BB">$content </span><span style="color: #007700">= </span><span style="color: #0000BB">iptcembed</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$path</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Write the new image data out to the file.<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$path</span><span style="color: #007700">, </span><span style="color: #DD0000">"wb"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">$content</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</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>
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</div>
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<div class="refsect1 notes" id="refsect1-function.iptcembed-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">此函数不需要 GD 图象库。</p></p></blockquote>
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</div>
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</div></div></div></body></html> |