websgetvar.htm

来自「一个典型的用于嵌入式Linux环境的Webserver」· HTM 代码 · 共 32 行

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<html><head><!- Copyright (c) Go Ahead Software Inc., 1995-2000. All Rights Reserved. -><title>websGetVar -- GoAhead WebServer API</title><link rel="stylesheet" href="../../../style/doc.css" type="text/css"></head><body><table width="550"> <tr><td><TABLE border=0 width=100% cellspacing=0 cellpadding=0 CLASS="apiTitle"> <TR> <td class="titleLeft" align=left width="33%"><b>websGetVar</b></TD><td class="titleCenter" align=center width="33%"><b> GoAhead WebServer API</b></TD><td class="titleRight" align=right width="33%"><B> GoAhead EMF</B></TD></TR> </TABLE><HR> <h2>Synopsis</h2><p>Return the value of a Form variable.</p><h2>Prototype</h2><pre> #include &quot;webs.h&quot;  char_t *<b>websGetVar</b>(webs_t wp, char_t *var, char_t *default); </pre><h2>Parameters</h2><table width=100% BORDER="0" CELLPADDING="0" CELLSPACING="0"> <TR> <TD VALIGN="TOP" WIDTH="6%">wp <TD WIDTH="94%">Web server connection handle.</TD></TR> <TR> <TD VALIGN="TOP" WIDTH="6%">var <TD WIDTH="94%">The form variable to be returned.</TD></TR> <TR> <TD VALIGN="TOP" WIDTH="6%">default <TD WIDTH="94%">The variable to be returned if none is defined in var.</TD></TR> </table><h2>Description</h2><P>The websGetVar procedure looks up <i>var</i> in the Form table of variables. If the variable is not defined, the value of the default is returned. If default is NULL and the variable is not found, NULL will be returned. Form variables are created for each &lt;input&gt; form tag. The <A href="websExpand.htm">standard form variables</A> are also defined.</P><h2>Return Value</h2><p> Returns a pointer to a statically allocated string. Do not call <A href="../basicapi/bfree.htm">bfree</A>.</p><h2>Example</h2><pre> name = websGetVar(wp, &quot;Name&quot;, &quot;Peter Smith&quot;); </pre><h2>Stability Classification</h2><p>Stable.</p><h2>See Also</h2><p> <A href="websSetVar.htm">websSetVar</A>, <A href="websTestVar.htm">websTestVar</A> </p></td></tr></table></body></html>

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