Help RootElement tagname

[Martijn Laarman]

I want to check the RootElement's tagname to make sure the xml is one i want to process i am however getting (null) all the time :(

            TiXmlNode* node = 0;
            TiXmlElement* itemElement = 0;
            node = doc.RootElement();
            itemElement = node->ToElement();
            assert(itemElement);
            const char *root = node->Value();

excerpt from my xml file starting from line 1.
- <dialog direction="horizontal" dname="dcXMLdialog" space="5 5 5 5">
- <pane direction="vertical" weight="2">
- <control type="panel" weigth="1" id="1">
  <childcontrol type="toolbar" id="12" weight="1" />
  <childcontrol type="listview" id="20" styles="report smallicon grid" weight="4" />
- <childcontrol type="panel" id="16" weigth="8">
  <childcontrol type="IPaddress" id="17" weight="1" />
  <childcontrol type="button" id="18" styles="" weight="4" />
- <pane direction="vertical" weight="2">

Any help would be appreciated alot :)

[Jewe]

Type error?

const char *root = itemElement->Value();

[Ellers]

Huh?

Read the source.

e.g.:
  http://tinyxml.cvs.sourceforge.net/tinyxml/tinyxml/tinyxml.h?view=markup

see various occurrences like:
  const char *Value()

Assuming that in your code itemElement is a ptr to a TiXmlNode then const char* is the right type.

Perhaps you can be more specific/detailed in your question?

[Martijn Laarman]

well i resolved this question by doing the rather simple:
--
valid_DCXML = doc.FirstChildElement("dialog");
if (valid_DCXML) {
--

However my question still sorta remains intact:
<pre>
void walkScript(TiXmlElement* element, char *dname, int depth=0) { 
    TiXmlElement* child = 0; 
    TString cmd;
    for( child = element->FirstChildElement(); child; child = child->NextSiblingElement() ) { 
        TiXmlElement* parent = child->Parent()->ToElement();
        cmd.sprintf("/echo -a Element %s %s %i parent: %s",
            child->Value(),child->Attribute("type"),depth,parent->Value());
        mIRCcom(cmd.to_chr());
        walkScript(child->ToElement(), dname, depth+1); 
    } 
}
</pre>

I use this slightly modified function that i found on these boards to iterate over all the elements in my XML which works perfectly however i am now faced with the rather silly question of how to do:
<pre>
if (parent->Value() == "control") {
    if (parent->Attribute("type") == "listview") { }
}
</pre>
Admittingly my c++ knowledge is very weak.

Example XML:
<pre>
<dialog cascade="v" space="5 5 5 5">
    <pane weigth="12">
        <control type="stacker" id="1" weigth="2">
            <control type="panel" id="2" weigth="2">
                <control type="listview" id="3" weigth="2" styles="report smallicon" />
            </control>
        </control>
    </pane>
    <control type="dialog" id="4" weigth="2">
        <pane weigth="12">
            <control type="listview" id="5" weigth="2" />
            <control type="panel" id="6" weigth="2">
                <control type="pbar" id="7" weigth="2" styles="report smallicon" />
            </control>
        </pane>
    </control>
    <control type="toolbar" id="8" weigth="8" heigth="30" styles="report smallicon" />
</dialog>
</pre>

[Ellers]

I can't say for sure if its the problem but this:

if (parent->Value() == "control") {
if (parent->Attribute("type") == "listview") { }

will only work if you are using classes for the strings, but it looks like you're using plain char *, in which case use:

if (0==strcmp(parent->Value(), "control")) {
if (0==strcmp(parent->Attribute("type"), "listview")) { }

HTH
Ellers

[Martijn Laarman]

Thanks that does the job :)
if (0==strcmp(valid_DCXML->Attribute("cascade"), "v")) { }
works but if i check on an attribute that doesn't excist the program throws an exception:
if (0==strcmp(valid_DCXML->Attribute("spaca"), "5 5 5 5")) { }

But i think that can be solved by doing:
const char * spaca= valid_DCXML->Attribute("spaca")
if (spaca) {
if (0==strcmp(spaca, "5 5 5 5")) { }

right ?

[Ellers]

That should be it exactly :)

[Martijn Laarman]

Alright :) Thanks for getting me on the right track now i can start doing the fun part: DOM parsing :D