xml_node is distroyed after loading

[changshen]

class myxmltool
{
public:
    string filename;
    xml_node root;
    myxmltool(string fname)
    {
        xml_document doc;
        doc.load_file(fname.c_str());
        root = xml_node(doc.root());  //root is created and has contents
    }

};

void main()
{
    myxmltool tool = myxmltool("c:\\myxmlfile.xml");
    xml_node rootnode = tool.root;  //root was not there.  it was distroyed already

}

[jima80525]

Isn't that because the doc has already been destructed? If you make the
doc a member of the class so it has not been freed, it will work.
Change the class to:

class myxmltool
{
public:
string filename;
xml_node root;
xml_document doc;

    myxmltool(string fname)
    {
        doc.load_file(fname.c_str());
        root = xml_node(doc.root()); //root is created and has contents
    }

};

jima

On Fri, Dec 4, 2015 at 8:39 AM, changshen notifications@github.com wrote:

class myxmltool
{
public:
string filename;
xml_node root;
myxmltool(string fname)
{
xml_document doc;
doc.load_file(fname.c_str());
root = xml_node(doc.root()); //root is created and has contents
}

};

void main()
{
myxmltool tool = myxmltool("c:\myxmlfile.xml");
xml_node rootnode = tool.root; //root was not there. it was distroyed
already

}

—
Reply to this email directly or view it on GitHub
#71.

[zeux]

xml_document object controls the lifetime of the tree; xml_node objects are just handles to nodes of that tree. Destroying the xml_document object leads to the entire tree being destroyed; it's invalid to use the nodes from the tree after that. This is described in more detail in this section of the manual: http://pugixml.org/docs/manual.html#dom.cpp.

[changshen]

Thanks zeux and jima
I thought of this and tried to have xml_document as a member of extended class. But compiler complained :
Error 2 error C2248: 'pugi::xml_document::xml_document' : cannot access private member declared in class 'pugi::xml_document'
even with empty constructor
myxmltool(string fname){}