[xml] memory issues when using xmlXPathEvalExpression

["Senthil Nathan" <rsennat gmail com>]

Hi All,

I'm having two issues when using libxml and its with my code only.

But please let me know, how to get this fixed.

 

1. A problem with the memory issue, I guess.

 

    With the below piece of code, in the constructor I have already created a xpathCtx = xmlXPathNewContext(tree);

    And then, I have written a xpatheval method, which gets the path to be evaluated.

    Because I evaluate the xpath _expression_ in many places, I have written this method.

    But with this, sometimes there is a segmentation fault in the xmlXPathEvalExpression( ) call.

    (when executing 10 times, twice it gives segv). How can I debug the memory issues with the libxml api's call

    or what could be wrong here?

xmlNodeSetPtr OTAccess::OTxmlXPathEvalExpression(string path)
{
    const xmlChar* cpath = xmlCharStrdup(path.c_str());
    xpathObj = xmlXPathEvalExpression(cpath, xpathCtx);
    xmlFree((void*)cpath);
    return (xpathObj->nodesetval);
}

2. Another problem is, I wrote a test program which sets the content of an element

    using xmlNodeSetContent(pnode, "100.100.100.100"), which is working fine.

 

    But when I used it in my actual code, xmlNodeSetContent(pnode, "100.100.100.100"), it gives the following error.

Access.cpp:100: error: invalid conversion from 'const char*' to 'const xmlChar*'
Access.cpp:100: error:   initializing argument 2 of 'void xmlNodeSetContent(xmlNode*, const xmlChar*)'

     Should I need to type cast to const xmlChar*. Even then, how it worked in the test program.

 

Please help me to fix these problems.

 

Thanks

Senthil