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<!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>从 FTP 服务器上获取文件并写入本地文件（non-blocking）</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.ftp-nb-get" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ftp_nb_get</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ftp_nb_get</span> — <span class="dc-title">从 FTP 服务器上获取文件并写入本地文件（non-blocking）</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.ftp-nb-get-unknown-seealsp">
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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>ftp_nb_get</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$ftp_stream</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$local_file</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$remote_file</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$resumepos</code></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>ftp_nb_get()</strong></span> 函数用来获取参数 <code class="parameter">remote_file</code>
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指定的的远程文件，并保存到由参数 <code class="parameter">local_file</code>
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指定的本地文件。传输模式参数
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<code class="parameter">mode</code> 只能为 <strong><code>FTP_ASCII</code></strong> (文本模式) 或 <strong><code>FTP_BINARY</code></strong>
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(二进制模式) 两种。与 <span class="function"><a href="ftp_get.html" class="function">ftp_get()</a></span>
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函数不同的是，此函数上传文件的时候采用的是异步传输模式，也就意味着在文件传送的过程中，你的程序可以继续干其它的事情。
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</p>
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<p class="para">
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返回 <strong><code>FTP_FAILED</code></strong>，<strong><code>FTP_FINISHED</code></strong>
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或 <strong><code>FTP_MOREDATA</code></strong>。
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</p>
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<p class="para">
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<div class="example" id="example-5320">
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<p><strong>Example #1 <span class="function"><strong>ftp_nb_get()</strong></span> 实例</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: #FF8000">// 开始下载<br /></span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">ftp_nb_get</span><span style="color: #007700">(</span><span style="color: #0000BB">$my_connection</span><span style="color: #007700">, </span><span style="color: #DD0000">"test"</span><span style="color: #007700">, </span><span style="color: #DD0000">"README"</span><span style="color: #007700">, </span><span style="color: #0000BB">FTP_BINARY</span><span style="color: #007700">);<br />while (</span><span style="color: #0000BB">$ret </span><span style="color: #007700">== </span><span style="color: #0000BB">FTP_MOREDATA</span><span style="color: #007700">) {<br /><br /> </span><span style="color: #FF8000">// 这里可以插入其它代码<br /> </span><span style="color: #007700">echo </span><span style="color: #DD0000">"."</span><span style="color: #007700">;<br /><br /> </span><span style="color: #FF8000">// 继续下载...<br /> </span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">ftp_nb_continue </span><span style="color: #007700">(</span><span style="color: #0000BB">$my_connection</span><span style="color: #007700">);<br />}<br />if (</span><span style="color: #0000BB">$ret </span><span style="color: #007700">!= </span><span style="color: #0000BB">FTP_FINISHED</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"下载中出错..."</span><span style="color: #007700">;<br /> exit(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-5321">
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<p><strong>Example #2 使用 <span class="function"><strong>ftp_nb_get()</strong></span> 函数断线续传</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// 开始<br /></span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">ftp_nb_get </span><span style="color: #007700">(</span><span style="color: #0000BB">$my_connection</span><span style="color: #007700">, </span><span style="color: #DD0000">"test"</span><span style="color: #007700">, </span><span style="color: #DD0000">"README"</span><span style="color: #007700">, </span><span style="color: #0000BB">FTP_BINARY</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">filesize</span><span style="color: #007700">(</span><span style="color: #DD0000">"test"</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">// 或: $ret = ftp_nb_get ($my_connection, "test", "README",<br />// FTP_BINARY, FTP_AUTORESUME);<br /></span><span style="color: #007700">while (</span><span style="color: #0000BB">$ret </span><span style="color: #007700">== </span><span style="color: #0000BB">FTP_MOREDATA</span><span style="color: #007700">) {<br /><br /> </span><span style="color: #FF8000">// 可以插入其它代码<br /> </span><span style="color: #007700">echo </span><span style="color: #DD0000">"."</span><span style="color: #007700">;<br /><br /> </span><span style="color: #FF8000">// 继续传送...<br /> </span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">ftp_nb_continue </span><span style="color: #007700">(</span><span style="color: #0000BB">$my_connection</span><span style="color: #007700">);<br />}<br />if (</span><span style="color: #0000BB">$ret </span><span style="color: #007700">!= </span><span style="color: #0000BB">FTP_FINISHED</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"下载出错..."</span><span style="color: #007700">;<br /> exit(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />}<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 class="example" id="example-5322">
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<p><strong>Example #3
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用 <span class="function"><strong>ftp_nb_get()</strong></span> 在 100 的位置断线续传并存为 "newfile"
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</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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// 禁止自动搜寻<br />ftp_set_option ($my_connection, FTP_AUTOSEEK, FALSE);<br /><br />// 开始<br />$ret = ftp_nb_get ($my_connection, "newfile", "README", FTP_BINARY, 100);<br />while ($ret == FTP_MOREDATA) {<br /><br /> ...<br /><br /> // 继续下载...<br /> $ret = ftp_nb_continue ($my_connection);<br />}</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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在上边的例子中，<var class="filename">"newfile"</var> 文件比服务器上的文件
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<var class="filename">"README"</var> 要小 100 字节。这是因为我们是从文件的偏移量 100
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处开始读取的，如果没有禁止 <strong><code>FTP_AUTOSEEK</code></strong>，则
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<var class="filename">"newfile"</var> 的前 100
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字节将会是 <em>'\0'</em>。
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</p>
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<p class="para">
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参见 <span class="function"><a href="ftp_nb_fget.html" class="function">ftp_nb_fget()</a></span>，<span class="function"><a href="ftp_nb_continue.html" class="function">ftp_nb_continue()</a></span>，<span class="function"><a href="ftp_get.html" class="function">ftp_get()</a></span>
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和 <span class="function"><a href="ftp_fget.html" class="function">ftp_fget()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |