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90 lines
3.7 KiB
90 lines
3.7 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 2.0</TITLE>
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<META NAME="author" CONTENT="Michael Sweet">
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<META NAME="copyright" CONTENT="Copyright 2003-2004">
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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="Nodes.html">
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<LINK REL="Next" HREF="FindingandIteratingNodes.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="Nodes.html">Previous</A>
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<A HREF="FindingandIteratingNodes.html">Next</A>
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<HR NOSHADE>
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<H2><A NAME="3_3">Loading and Saving XML Files</A></H2>
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<P>You load an XML file using the <A href="mxmlLoadFile.html#mxmlLoadFile">
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<TT>mxmlLoadFile()</TT></A> function:</P>
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<PRE>
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FILE *fp;
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *tree;
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fp = fopen("filename.xml", "r");
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tree = <A href="mxmlLoadFile.html#mxmlLoadFile">mxmlLoadFile</A>(NULL, fp, MXML_NO_CALLBACK);
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fclose(fp);
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</PRE>
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<P>The third argument specifies a callback function which returns the
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value type of the immediate children for a new element node: <TT>
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MXML_INTEGER</TT>, <TT>MXML_OPAQUE</TT>, <TT>MXML_REAL</TT>, or <TT>
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MXML_TEXT</TT>. This function is called<I> after</I> the element and its
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attributes have been read, so you can look at the element name,
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attributes, and attribute values to determine the proper value type to
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return. The default value type is MXML_TEXT if no callback is used.</P>
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<P>Similarly, you save an XML file using the <A href="mxmlSaveFile.html#mxmlSaveFile">
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<TT>mxmlSaveFile()</TT></A> function:</P>
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<PRE>
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FILE *fp;
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *tree;
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fp = fopen("filename.xml", "w");
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<A href="mxmlSaveFile.html#mxmlSaveFile">mxmlSaveFile</A>(tree, fp, MXML_NO_CALLBACK);
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fclose(fp);
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</PRE>
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<P>Callback functions for saving are used to optionally insert
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whitespace before and after elements in the node tree. Your function
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will be called up to four times for each element node with a pointer to
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the node and a "where" value of <TT>MXML_WS_BEFORE_OPEN</TT>, <TT>
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MXML_WS_AFTER_OPEN</TT>, <TT>MXML_WS_BEFORE_CLOSE</TT>, or <TT>
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MXML_WS_AFTER_CLOSE</TT>. The callback function should return <TT>NULL</TT>
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if no whitespace should be added and the string to insert (spaces,
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tabs, carriage returns, and newlines) otherwise.</P>
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<P>The <A href="mxmlLoadString.html#mxmlLoadString"><TT>mxmlLoadString()</TT>
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</A>, <A href="mxmlSaveAllocString.html#mxmlSaveAllocString"><TT>
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mxmlSaveAllocString()</TT></A>, and <A href="mxmlSaveString.html#mxmlSaveString">
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<TT>mxmlSaveString()</TT></A> functions load XML node trees from and
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save XML node trees to strings:</P>
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<PRE>
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char buffer[8192];
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char *ptr;
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *tree;
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...
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tree = <A href="mxmlLoadString.html#mxmlLoadString">mxmlLoadString</A>(NULL, buffer, MXML_NO_CALLBACK);
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...
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<A href="mxmlSaveString.html#mxmlSaveString">mxmlSaveString</A>(tree, buffer, sizeof(buffer), MXML_NO_CALLBACK);
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...
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ptr = <A href="mxmlSaveAllocString.html#mxmlSaveAllocString">mxmlSaveAllocString</A>(tree, MXML_NO_CALLBACK);
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</PRE>
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<HR NOSHADE>
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<A HREF="toc.html">Contents</A>
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<A HREF="Nodes.html">Previous</A>
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<A HREF="FindingandIteratingNodes.html">Next</A>
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</BODY>
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</HTML>
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