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127 lines
5.5 KiB
127 lines
5.5 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
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<HTML>
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<HEAD>
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<TITLE>Mini-XML Programmers Manual, Version 2.2.1</TITLE>
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<META NAME="author" CONTENT="Michael Sweet">
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<META NAME="copyright" CONTENT="Copyright 2003-2005">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-iso-8859-1">
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<LINK REL="Start" HREF="index.html">
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<LINK REL="Contents" HREF="toc.html">
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<LINK REL="Prev" HREF="SavingXML.html">
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<LINK REL="Next" HREF="3MoreMiniXMLProgrammingTechniques.html">
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<STYLE TYPE="text/css"><!--
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BODY { font-family: serif }
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H1 { font-family: sans-serif }
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H2 { font-family: sans-serif }
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H3 { font-family: sans-serif }
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H4 { font-family: sans-serif }
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H5 { font-family: sans-serif }
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H6 { font-family: sans-serif }
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SUB { font-size: smaller }
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SUP { font-size: smaller }
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PRE { font-family: monospace }
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--></STYLE>
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</HEAD>
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<BODY>
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<A HREF="toc.html">Contents</A>
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<A HREF="SavingXML.html">Previous</A>
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<A HREF="3MoreMiniXMLProgrammingTechniques.html">Next</A>
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<HR NOSHADE>
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<H3><A NAME="3_4_1">Finding and Iterating Nodes</A></H3>
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<P>The <A href="mxmlWalkPrev.html#mxmlWalkPrev"><TT>mxmlWalkPrev()</TT></A>
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and <A href="mxmlWalkNext.html#mxmlWalkNext"><TT>mxmlWalkNext()</TT></A>
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functions can be used to iterate through the XML node tree:</P>
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<PRE>
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *node = <A href="mxmlWalkPrev.html#mxmlWalkPrev">mxmlWalkPrev</A>(current, tree, MXML_DESCEND);
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *node = <A href="mxmlWalkNext.html#mxmlWalkNext">mxmlWalkNext</A>(current, tree, MXML_DESCEND);
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</PRE>
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<P>In addition, you can find a named element/node using the <A href="mxmlFindElement.html#mxmlFindElement">
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<TT>mxmlFindElement()</TT></A> function:</P>
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<PRE>
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, "name", "attr",
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"value", MXML_DESCEND);
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</PRE>
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<P>The <TT>name</TT>, <TT>attr</TT>, and <TT>value</TT> arguments can be
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passed as <TT>NULL</TT> to act as wildcards, e.g.:</P>
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<PRE>
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/* Find the first "a" element */
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, "a", NULL, NULL, MXML_DESCEND);
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/* Find the first "a" element with "href" attribute */
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, "a", "href", NULL, MXML_DESCEND);
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/* Find the first "a" element with "href" to a URL */
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, "a", "href",
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"http://www.easysw.com/~mike/mxml/", MXML_DESCEND);
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/* Find the first element with a "src" attribute*/
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, NULL, "src", NULL, MXML_DESCEND);
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/* Find the first element with a "src" = "foo.jpg" */
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, NULL, "src", "foo.jpg", MXML_DESCEND);
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</PRE>
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<P>You can also iterate with the same function:</P>
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<PRE>
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *node;
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for (node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(tree, tree, "name", NULL, NULL, MXML_DESCEND);
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node != NULL;
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node = <A href="mxmlFindElement.html#mxmlFindElement">mxmlFindElement</A>(node, tree, "name", NULL, NULL, MXML_DESCEND))
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{
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... do something ...
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}
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</PRE>
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<P>The <TT>MXML_DESCEND</TT> argument can actually be one of three
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constants:</P>
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<UL>
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<LI><TT>MXML_NO_DESCEND</TT> means to not to look at any child nodes in
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the element hierarchy, just look at siblings at the same level or
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parent nodes until the top node or top-of-tree is reached. The previous
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node from "group" would be the "node" element to the left, while the
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next node from "group" would be the "node" element to the right.</LI>
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<LI><TT>MXML_DESCEND_FIRST</TT> means that it is OK to descend to the
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first child of a node, but not to descend further when searching.
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You'll normally use this when iterating through direct children of a
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parent node, e.g. all of the "node" elements under the "?xml" parent
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node in the example above. This mode is only applicable to the search
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function; the walk functions treat this as <TT>MXML_DESCEND</TT> since
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every call is a first time.</LI>
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<LI><TT>MXML_DESCEND</TT> means to keep descending until you hit the
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bottom of the tree. The previous node from "group" would be the "val3"
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node and the next node would be the first node element under "group".
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If you were to walk from the root node "?xml" to the end of the tree
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with <TT>mxmlWalkNext()</TT>, the order would be:
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<PRE>
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?xml
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data
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node
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val1
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node
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val2
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node
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val3
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group
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node
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val4
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node
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val5
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node
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val6
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node
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val7
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node
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val8
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node
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val9
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</PRE>
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<P>If you started at "val9" and walked using <TT>mxmlWalkPrev()</TT>,
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the order would be reversed, ending at "?xml".</P>
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</LI>
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</UL>
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<HR NOSHADE>
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<A HREF="toc.html">Contents</A>
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<A HREF="SavingXML.html">Previous</A>
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<A HREF="3MoreMiniXMLProgrammingTechniques.html">Next</A>
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</BODY>
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</HTML>
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