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I am new to XML and would appreciate some help getting started using the XMLNodeWrapper. My XML document looks like this:
//*********************************************************************************************
-
- <root>
<participant>TEST
- <envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/">
-
- <notifications xmlns="http://markets.midwestiso.org/dart/xml">
- <dispatch interval="2005-10-17T22:30:00.000-05:00" location="SIN.APLG.HECK8">
<dispatchmw>84
<price>25.54
- <dispatch interval="2005-10-17T22:30:00.000-05:00" location="SIN.APLG.JBEN4">
<dispatchmw>124
<price>25.43
- <dispatch interval="2005-10-17T22:30:00.000-05:00" location="SIN.APLG.KIAF2">
<dispatchmw>141
<price>25.47
- <dispatch interval="2005-10-17T22:30:00.000-05:00" location="SIN.APLG.KIAF8">
<dispatchmw>272
<price>25.81
- <dispatch interval="2005-10-17T22:30:00.000-05:00" location="SIN.APLG.MIMM">
<dispatchmw>272
<price>25.81
//*********************************************************************************************
I have tried the following commands to retrieve the DispatchMW values but the szValue comes back NULL everytime. I really would like to retrieve each DispatchMW value per each location and store these values in a database. Any help would be appreciated.
//************************************************************
m_xmlDocument.Load("C:\\harris\\XML\\dispatch test.xml");
CXmlNodeWrapper root(m_xmlDocument.AsNode());
CXmlNodeWrapper myOutPutNode(root.FindNode("Dispatch/DispatchMW"));
CString szValue = myOutPutNode.GetText();
//************************************************************
Thanks in advance,
Dave G
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Hello,
I need to create a new document, add nodes to it and save it.
How do I do it ?
How do I create a new node ?
How do I create a documnet from scratch?
Thanks,
jr.
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Example:
CXmlDocumentWrapper doc;
doc.LoadXML("<root>");
CXmlNodeWrapper root(doc.AsNode());
CXmlNodeWrapper node(root.AddNode("New_Node"));
node.SetValue("SomeValue","Data_Item");
doc.Save("C:\\newdoc.xml");
Creative minds - create creative creations!
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Hi
I'm also having problems creating a new XML document and saving it to file. The above code fails to compile, as AddNode is not a member of CXmlNodeWrapper? Also, doc.AsNode() returns NULL - is this to be expected?
Another example would be great, and would help to support this excellent XML wrapper class
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I'm sorry for misleading you , since I was writing the above code from my memory , without actually looking at the source, and apparently my memory is not as good as I hoped it to be .
You should use "InsertNode" instead of "AddNode" (you can use -1 as an index to insert at the end).
Also the LoadXML function should load some actual XML string and not an empty string like it looks (the foeum engine must have stripped the XML tags away) , for example:
xmlDoc.LoadXML("<Root></Root>");
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Hi,
I m just trying to use your wrapper to play with XML,
i just created a dialog application and tried to use Load function.
First of all i created CXmlDocumentWrapper m_xmlDoc; in the header file and then onOK function
i m calling m_xmlDoc.Load("C:\\sample.xml"); but when i debug i found out its returing at this line if (!IsValid())
return FALSE;
kidnly let me know, what do i have to do.
Regards,
-- modified at 13:24 Monday 17th October, 2005
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Either your XML file is not well formed. Or there is some other error.
You should provide more code and the sample xml doc , for me to be able to help you.
Creative minds - create creative creations!
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Thanks, just came cross to this article again....so noticed i forgot the reply it.
i was doing a silly mistake that why i was having that probolem...just explainig it here so that if any1else getting the same problem then it would be easy to get solution without spending hrs to located the problem.
Solution was straight forward since MSXML is COM base and we have to always Coinitialize it to NULL. So i had to just call CoInitialize(NULL) from InitInstance().
Regards,
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Hi when I load the document I always get FALSE
My code:
m_xmlDoc.Load("Downloads.xml");
if (m_xmlDoc.IsValid()==TRUE) MessageBox("TRUE");
else MessageBox("FALSE");
Decleration of m_xmlDoc:
CXmlDocumentWrapper m_xmldoc;
When I opend the file with your program I can list the XML, but when I want to open the file with my program it dosnt work I also called CoIntialize(NULL) in InitInstance() and I always get FALSE message, I also included all of the headers that you included in your program.
PLZ help || advice && MessageBox("Have a nice Day ");
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I changed the default ctor as follows, and it seems to pass the IsValid() function. Although I'm still having a problem loading a XML file..
CXmlDocumentWrapper::CXmlDocumentWrapper()
{
CoInitialize(NULL);
try
{
m_xmldoc = NULL;
m_xmldoc.CreateInstance(MSXML2::CLSID_DOMDocument);
}
catch(_com_error &e)
{
CString strError(_T(e.ErrorMessage()));
CString strDescription(_T((LPCSTR) e.Description()));
}
}
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Hola a todos,
En especial a Alex Hazanov,
He probado tus XMLNodeWrapper.h y .cpp en mi aplicacion y no funciona, he llevado todo a la tuya y si me va, pero en la mia no, me falla en el
m_xmlDoc.Load()
no me lee la ruta que le pongo, la he puesto de mil formas y he visto que
BOOL CXmlDocumentWrapper::IsValid()
{
if (m_xmldoc == NULL)
{
AfxMessageBox("Hola");
return FALSE;
}
if (m_xmldoc.GetInterfacePtr() == NULL)
{
AfxMessageBox("Adios");
return FALSE;
}
return TRUE;
}
se me va en el primero, no se pq pero el m_xmldoc me dice q es null
pq es???
Que alguien me de una solucion, llevo mas de 1 mes con ese error y no me lo puedo permitir
Escribirme a ruespla@upvnet.upv.es
Gracias
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Sorry my spanish is not as good as my programming skills
I can only guess that you are trying to use the document wrapper and you either fail to load a document or you are trying to use an uninitialized document.
So you must note that :
1. To load a document you have to call the Load() function passing a full path name to the xml file ==> xmlDoc.Load("C:\\Some Folder\\some_xml_doc.xml");
2. To use the document without an xml file (build it from scratch) you have to load in as an xml string at least the root node, without it the document will not have the root node ==> xmlDoc.LoadXML("<SomeRoot></SomeRoot>");
Creative minds - create creative creations!
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Ruben,I guess you problem is that you forgot to to call CoInitialize(NULL) from InitInstance() ..or some other suitable place..
Now in spanish as well:Creo que tu problema es que te olvidaste de llamar a CoInitialize(NULL) desde InitInstance() ...o en otro lugar correspondiente
HTH (Hope that helps)
-- Ricky Marek (AKA: rbid)
-- "Things are only impossible until they are not" --- Jean-Luc Picard
My articles
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Hello!
Here are a few more functions, perhaps useful to others. First off, I would suggest making all accessors const, and I also changed CString to std::string. For me, this was more convenient. Anyway, here are the functions:
<code>
string CXmlNodeWrapper::GetNamespaceURI() const
{
if( IsValid() )
{
_bstr_t str = static_cast<_bstr_t>(m_xmlnode->GetnamespaceURI());
return static_cast<char*>(str);
}
return "";
}
string CXmlNodeWrapper::GetNodeValue() const
{
if( IsValid() ) {
_bstr_t str = static_cast<_bstr_t>(m_xmlnode->GetnodeValue());
return static_cast<char*>(str);
}
return "";
}
MSXML2::IXMLDOMNodePtr CXmlNodeWrapper::InsertNode(int index, LPCTSTR nodeName, LPCTSTR nameSpace)
{
MSXML2::IXMLDOMDocumentPtr xmlDocument = m_xmlnode->GetownerDocument();
if (xmlDocument)
{
MSXML2::IXMLDOMNodePtr newNode = xmlDocument->createNode(_variant_t((short)MSXML2::NODE_ELEMENT), nodeName, nameSpace);
MSXML2::IXMLDOMNodePtr refNode = GetNode(index);
if (refNode)
newNode = m_xmlnode->insertBefore(newNode,_variant_t(refNode.GetInterfacePtr()));
else
newNode = m_xmlnode->appendChild(newNode);
return newNode;
}
return NULL;
}
void CXmlDocumentWrapper::CreateRootElement(LPCSTR name, LPCTSTR nameSpace)
{
MSXML2::IXMLDOMElementPtr pe;
pe = m_xmldoc->createNode("element", name, nameSpace);
if( pe!=NULL )
{
m_xmldoc->appendChild(pe);
pe.Release();
}
}
string CXmlDocumentWrapper::GetParseError() const
{
if( IsValid() )
{
MSXML2::IXMLDOMParseErrorPtr error = m_xmldoc->GetparseError();
boost::format f("Error:\nCode = 0x%1$x\nSource = Line: %2%, Char: %3%\nError Description = %4%");
_bstr_t bstrErr(error->Getreason());
f % error->GeterrorCode() % error->Getline() % error->Getlinepos() % (char*)bstrErr;
return f.str();
}
else
return "";
}
void CXmlDocumentWrapper::CreateProcessingInstruction(LPCTSTR target, LPCTSTR data)
{
MSXML2::IXMLDOMProcessingInstructionPtr pi;
pi = m_xmldoc->createProcessingInstruction(target, data);
if( pi!=NULL )
{
m_xmldoc->appendChild(pi);
pi.Release();
}
}
</code>
That's it.
Thanks for a great set of wrappers!
Daniel Lidström
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Thanks Daniel.
I'm very happy to see that someone is not only blindly using the the wrapper (although that is perfectly OK , that was the intention), but also developing and farther enriching it.
Again , thank you very much.
Creative minds - create creative creations!
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Hi Alex,
Why won't you update your excellent class with those ammenments then?
I'm observing it now to see how it will fit to my current application. If it will, you will absolutely get a 5!
Stilgar.
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Sorry but I don't know how to create an xml like
<?xml verion = "1.0" encoding = "UTF-8"?>
<root>
<attb name = "1">
<ele name = "1.1">
</attb>
<attb name = "2">
<ele name = "2.1">
</attb>
</root>
I called:
doc.CreateProcessingInstruction("xml", "1.0");
doc.LoadXML("<root></root>");
...
but it didn't at <?xml = "1.0"?> at the beginning of the doc
I called:
doc.LoadXML("<root></root>");
doc.CreateProcessingInstruction("xml", "1.0");
...
it insert <?xml = "1.0"?> after <root> element.
Please help! Thank you in advanced!
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Hello!
How do I access the node value of a text node. For example, the xml is this:
<?xml version="1.0" encoding="utf-8"?>
<Model mod_att1="val1" mod_att2="val2">__model_value__
<MainLine att1="val1" att2="val2">__mainline_value__
</MainLine>
</Model>
If I have a CXmlNodeWrapper pointing to the top element, Model, and I call GetText, then I receive a string with a value of
"__model_value__
__mainline_value__"
How do I get the value of the Model element? I'm only interested in the __model_value__ part.
Thanks in advance!
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I figured it out. Add a method to CXmlNodeWrapper like this:
class CXmlNodeWrapper
{
...
//! Access the value of the node
std::string GetNodeValue() const;
};
string CXmlNodeWrapper::GetNodeValue() const
{
if( IsValid() ) {
_bstr_t str = static_cast<_bstr_t>(m_xmlnode->GetnodeValue());
return static_cast<char*>(str);
}
return "";
}
This method may only be called when NodeType() returns "text".
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Hello :->
As I can't find a solution for my GetUrl() problem, I changed my objective :
I would like to use the "Serialize" function to save my DOM....like that, I don't care of all open/save functions
Is it possible to serialize my DOM ?
Bye.
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I am going to use MSXML 3.0 in my project. I have a time critical process where i need to generate a big XML file within 3 sec This is the maximum amount of time avaiable for the process to complete.Can MSXML 3.0 do it for me. Anybody any comments.
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Of course it can, it has only about 10000000 different "ifs".
Such as what prosessor do you have, what is the speed of your hard disk, wether your process has the highest priority , what processor time is available for your process, how big is your file going to be, is the mashine doing something elese at this moment (updating the untivirus for example) , etc...
What I'm trying to say is that you should NEVER under no circumstanses expect some task finish in some predefined time , please either work on some other strategy in your application or at least explain why is the time so critical.
Creative minds - create creative creations!
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Why the process is time critical ? the answer to that is , i am generating an export for a device configuration , the configuration is saved as an xml file . Now when the user exports the configuration , i dont have any status bar for indicating the status of the export, thus the application which i am using for export appears to be hung. I dont want to spoil the user experience by taking too long a time to generate an export,thats why a self imposed time criticality is there.I was talking to one of my friends about MSXML 3.0 taking too long to taverse the DOM tree if the XML document is too big , I wanted your opinion on weather MSXML is slow . I have worked with it earlier and i found it really fast , generating an xml in milli seconds.But i still need a confiration from someone before i go ahead.After reading the article i felt you might be the one. Thanx in advance for paying attention.
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MSXML is capble of producing 50000 nodes XML in less than a second.
It also capble of quiering this XML 5~50 quieries in less than a second.
But as I said before it all depends on many issues.
My advise for you is to try first, than if you see that the process of saving the configuration is taking too long (more than couple of seconds) consined adding a progress bar or if that is not possible, at least some flashing message like "Saving configuration, please wait...".
Creative minds - create creative creations!
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Hi,
first : thanks for your good work.
I'm trying to use your function GetUrl() to know if the document has been already saved, but it doesn't work.
<br />
if(_myDoc.GetUrl() != ""){<br />
return (_myDoc.Save(""));<br />
}else{<br />
CFileDialog fDlg(FALSE,"xml",NULL,OFN_HIDEREADONLY | OFN_PATHMUSTEXIST,"Xml Files (*.xml)|*.xml||");<br />
...<br />
Can you give me a clue ?
Thx !
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