libxml2-xpath.html

xml开源解析代码.版本为libxml2-2.6.29,可支持GB3212.网络消息发送XML时很有用.

    double	floatval
    <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	stringval
    void *	user
    int	index
    void *	user2
    int	index2
} xmlXPathObject;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathObjectPtr">Typedef </a>xmlXPathObjectPtr</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObject">xmlXPathObject</a> * xmlXPathObjectPtr;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathObjectType">Enum </a>xmlXPathObjectType</h3><pre class="programlisting">enum <a href="#xmlXPathObjectType">xmlXPathObjectType</a> {
    <a name="XPATH_UNDEFINED">XPATH_UNDEFINED</a> = 0
    <a name="XPATH_NODESET">XPATH_NODESET</a> = 1
    <a name="XPATH_BOOLEAN">XPATH_BOOLEAN</a> = 2
    <a name="XPATH_NUMBER">XPATH_NUMBER</a> = 3
    <a name="XPATH_STRING">XPATH_STRING</a> = 4
    <a name="XPATH_POINT">XPATH_POINT</a> = 5
    <a name="XPATH_RANGE">XPATH_RANGE</a> = 6
    <a name="XPATH_LOCATIONSET">XPATH_LOCATIONSET</a> = 7
    <a name="XPATH_USERS">XPATH_USERS</a> = 8
    <a name="XPATH_XSLT_TREE">XPATH_XSLT_TREE</a> = 9 /*  An XSLT value tree, non modifiable */
};
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathParserContext">Structure </a>xmlXPathParserContext</h3><pre class="programlisting">struct _xmlXPathParserContext {
    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	cur	: the current char being parsed
    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	base	: the full expression
    int	error	: error code
    <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a>	context	: the evaluation context
    <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a>	value	: the current value
    int	valueNr	: number of values stacked
    int	valueMax	: max number of values stacked
    <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> *	valueTab	: stack of values
    <a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a>	comp	: the precompiled expression
    int	xptr	: it this an XPointer expression
    <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a>	ancestor	: used for walking preceding axis
} xmlXPathParserContext;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathParserContextPtr">Typedef </a>xmlXPathParserContextPtr</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathParserContext">xmlXPathParserContext</a> * xmlXPathParserContextPtr;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathType">Structure </a>xmlXPathType</h3><pre class="programlisting">struct _xmlXPathType {
    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	name	: the type name
    <a href="libxml2-xpath.html#xmlXPathConvertFunc">xmlXPathConvertFunc</a>	func	: the conversion function
} xmlXPathType;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathTypePtr">Typedef </a>xmlXPathTypePtr</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathType">xmlXPathType</a> * xmlXPathTypePtr;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathVariable">Structure </a>xmlXPathVariable</h3><pre class="programlisting">struct _xmlXPathVariable {
    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	name	: the variable name
    <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a>	value	: the value
} xmlXPathVariable;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathVariablePtr">Typedef </a>xmlXPathVariablePtr</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathVariable">xmlXPathVariable</a> * xmlXPathVariablePtr;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathAxisFunc"/>Function type xmlXPathAxisFunc</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a>	xmlXPathAxisFunc	(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>						 <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> cur)<br/>
</pre><p>An axis traversal function. To traverse an axis, the engine calls the first time with cur == NULL and repeat until the function returns NULL indicating the end of the axis traversal.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath interpreter context</td></tr><tr><td><span class="term"><i><tt>cur</tt></i>:</span></td><td>the previous node being explored on that axis</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the next node in that axis or NULL if at the end of the axis.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathConvertFunc"/>Function type xmlXPathConvertFunc</h3><pre class="programlisting">int	xmlXPathConvertFunc		(<a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj, <br/>					 int type)<br/>
</pre><p>A conversion function is associated to a type and used to cast the new type to primitive values.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>obj</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><span class="term"><i><tt>type</tt></i>:</span></td><td>the number of the target type</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>-1 in case of error, 0 otherwise</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathEvalFunc"/>Function type xmlXPathEvalFunc</h3><pre class="programlisting">void	xmlXPathEvalFunc		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>
</pre><p>An XPath evaluation function, the parameters are on the XPath context stack.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments passed to the function</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathFuncLookupFunc"/>Function type xmlXPathFuncLookupFunc</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a>	xmlXPathFuncLookupFunc	(void * ctxt, <br/>						 const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>						 const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Prototype for callbacks used to plug function lookup in the XPath engine.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath context</td></tr><tr><td><span class="term"><i><tt>name</tt></i>:</span></td><td>name of the function</td></tr><tr><td><span class="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name hosting this function</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the XPath function or NULL if not found.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathFunction"/>Function type xmlXPathFunction</h3><pre class="programlisting">void	xmlXPathFunction		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>
</pre><p>An XPath function. The arguments (if any) are popped out from the context stack and the result is pushed on the stack.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath interprestation context</td></tr><tr><td><span class="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathVariableLookupFunc"/>Function type xmlXPathVariableLookupFunc</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a>	xmlXPathVariableLookupFunc	(void * ctxt, <br/>							 const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>							 const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Prototype for callbacks used to plug variable lookup in the XPath engine.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath context</td></tr><tr><td><span class="term"><i><tt>name</tt></i>:</span></td><td>name of the variable</td></tr><tr><td><span class="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name hosting this variable</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the XPath object value or NULL if not found.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathNAN">Variable </a>xmlXPathNAN</h3><pre class="programlisting">double xmlXPathNAN;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathNINF">Variable </a>xmlXPathNINF</h3><pre class="programlisting">double xmlXPathNINF;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathPINF">Variable </a>xmlXPathPINF</h3><pre class="programlisting">double xmlXPathPINF;
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastBooleanToNumber"/>xmlXPathCastBooleanToNumber ()</h3><pre class="programlisting">double	xmlXPathCastBooleanToNumber	(int val)<br/>
</pre><p>Converts a boolean to its number value</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>val</tt></i>:</span></td><td>a boolean</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number value</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastBooleanToString"/>xmlXPathCastBooleanToString ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	xmlXPathCastBooleanToString	(int val)<br/>
</pre><p>Converts a boolean to its string value.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>val</tt></i>:</span></td><td>a boolean</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>a newly allocated string.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastNodeSetToBoolean"/>xmlXPathCastNodeSetToBoolean ()</h3><pre class="programlisting">int	xmlXPathCastNodeSetToBoolean	(<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br/>
</pre><p>Converts a node-set to its boolean value</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ns</tt></i>:</span></td><td>a node-set</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the boolean value</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastNodeSetToNumber"/>xmlXPathCastNodeSetToNumber ()</h3><pre class="programlisting">double	xmlXPathCastNodeSetToNumber	(<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br/>
</pre><p>Converts a node-set to its number value</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ns</tt></i>:</span></td><td>a node-set</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number value</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastNodeSetToString"/>xmlXPathCastNodeSetToString ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	xmlXPathCastNodeSetToString	(<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> ns)<br/>
</pre><p>Converts a node-set to its string value.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ns</tt></i>:</span></td><td>a node-set</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>a newly allocated string.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastNodeToNumber"/>xmlXPathCastNodeToNumber ()</h3><pre class="programlisting">double	xmlXPathCastNodeToNumber	(<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Converts a node to its number value</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>node</tt></i>:</span></td><td>a node</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number value</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCastNodeToString"/>xmlXPathCastNodeToString ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> *	xmlXPathCastNodeToString	(<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Converts a node to its string value.</p>