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CXml - A Wrapping Class for MSXML 3.0/4.0/5.0/6.0

By bc-vnt, in Tutoriale in engleza

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Introduction

MSXML, a window component shipped with Windows / Office and other microsoft products, exists in all windows platforms. But there are different versions of MSXML, from 2.6 to 6.0, which causes a lot of problems.

This is a wrapping class library for MSXML 3.0/4.0/5.0/6.0 consisting of resolving the above problem -- you don't need worry about the available MSXML version on different machines any more.

and also it provides easy-to-use interface -- each node in the xml is considered as an object and you can use some code like below to locate a node.

xml.GetRoot()->GetChild(_T("a"))->GetChild(_T("b"))->GetChild(_T("c"))

Sample Code

Please find the sample code in the demo project.

demo.jpg

Using the Code

Copy all the files in the /CXml/*.* directory and add them into your project.

#include "Xml.h"
using namespace JWXml;

Here, I have added a namespace for the classes, you can change it as you like.

MSXML Version

The class will try to choose the version of MSXML in the following order:

hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument60) );
hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument30) );
hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument50) );
hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument40) );
hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument26) );
hr = (hr == S_OK) ? hr : m_pDoc.CreateInstance( __uuidof(MSXML2::DOMDocument) );

Classes Overview

CXml

class CXml
{
	friend class CXsl;

public:
	CXml(void);
	~CXml(void);

protected:
	MSXML2::IXMLDOMDocument2Ptr m_pDoc;
	CString m_strFilePath;
	MSXML_VERSION m_emVersion;
	std::map< CString, CString> m_mpNamespace;

	BOOL CreateInstance(void);

public:
	// Open XML file
	BOOL Open(LPCTSTR lpszXmlFilePath);

	// Create a new XML file
	BOOL Create( LPCTSTR lpszRootName = _T("xmlRoot")
		, LPCTSTR lpszPrefix = _T("")
		, LPCTSTR lpszNamespaceURI = _T("")
		);

	// Load XML string
	BOOL LoadXml(LPCTSTR lpszXmlContent);

	// save XML file
	BOOL Save(LPCTSTR lpszFilePath);

	// save XML file with formatted output
	BOOL SaveWithFormatted(LPCTSTR lpszFilePath = NULL, 
			LPCTSTR lpszEncoding = _T("UTF-8"));

	// close XML file
	void Close(void);

	CString GetXmlFile(void) const;

	// Encode the binary data into string
	CString Base64Encode( LPBYTE pBuf, ULONG ulSize);

	// Decode the string into binary data
	BOOL Base64Decode( CString strIn, LPBYTE pBuf, LONG & lSize);

	// namespace
	void AddSelectionNamespace( LPCTSTR lpszPrefix, LPCTSTR lpszURI);

	// get the root element of
	CXmlNodePtr GetRoot(void);

	// get single node by XPath
	CXmlNodePtr SelectSingleNode(LPCTSTR lpszPath);

	// get nodes by XPath
	CXmlNodesPtr SelectNodes(LPCTSTR lpszPath);

	// create node
	CXmlNodePtr CreateNode(LPCTSTR lpszName
		, LPCTSTR lpszPrefix = _T("")
		, LPCTSTR lpszNamespaceURI = _T("")
		);

	// get the current version of MSXML
	MSXML_VERSION GetVersion(void) const;
};

CXmlNode

class CXmlNode
{
	friend class CXml;
	friend class CXmlNode;
	friend class CXmlNodes;

protected:
	MSXML2::IXMLDOMNodePtr m_pNode;

	CXmlNode( MSXML2::IXMLDOMNodePtr pNode);

	BOOL _GetValue(CString & strValue) const;
	BOOL _SetValue(CString & strValue) const;

	BOOL _GetAttribute( CString & strName, CString & strValue) const;
	BOOL _SetAttribute( CString & strName IN
					  , CString & strValue IN
					  , CString & strPrefix IN
					  , CString & strNamespaceURI IN
					  ) const;

public:

	CXmlNode(void);
	CXmlNode(const CXmlNode & refNode IN);
	CXmlNode(const CXmlNodePtr pNode IN);
	~CXmlNode(void);

	CXmlNodePtr operator = (CXmlNodePtr pNode);
	CXmlNode & operator = (const CXmlNode & refNode);

	BOOL IsNull(void) const; 	// Whether the current element exist
	CString GetName(void) const;// Get the name of the current node
	CXmlNode & Detach(void);	// Detach the current node
	void Release(void);	// Release this node

	CXmlNodePtr GetChild( CString strName, BOOL bBuildIfNotExist = TRUE);
	CXmlNodePtr NewChild( CString strName );
	CXmlNodePtr GetParent(void);
	CXmlNodesPtr GetChildren();
	void AttachChild( CXmlNodePtr & pChildNode);
	void AttachChild( CXmlNode & refChildNode);
	BOOL HasChildren(void);
	BOOL RemoveChildren(void);

	CString	GetAttribute( CString strName, LPCTSTR lpszDefault = NULL) const;
	bool	GetAttribute( CString strName, bool bDefault) const;
	int		GetAttribute( CString strName, int nDefault) const;
	long	GetAttribute( CString strName, long lDefault) const;
	__int64	GetAttribute( CString strName, __int64 llDefault) const;
	float	GetAttribute( CString strName, float fDefault) const;
	double	GetAttribute( CString strName, double dDefault) const;
	DWORD	GetAttribute( CString strName, DWORD dwDefault) const;

	BOOL	SetAttribute( CString strName, LPCTSTR lpszValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, bool bValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, int nValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, long lValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, __int64 llValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, float fValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, double dValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));
	BOOL	SetAttribute( CString strName, DWORD dwValue ,
		    CString strPrefix = _T(""), CString strNamespaceURI = _T(""));

	BOOL RemoveAttribute( CString strName );

	CString	GetValue( LPCTSTR lpszDefault = NULL ) const;
	bool	GetValue( bool bDefault ) const;
	int		GetValue( int nDefault) const;
	long	GetValue( long lDefault) const;
	__int64	GetValue( __int64 llDefault) const;
	float	GetValue( float fDefault) const;
	double	GetValue( double dDefault) const;
	DWORD	GetValue( DWORD dwDefault) const;

	BOOL	SetValue( LPCTSTR lpszValue );
	BOOL	SetValue( bool bValue );
	BOOL	SetValue( int nValue );
	BOOL	SetValue( long lValue );
	BOOL	SetValue( __int64 llValue );
	BOOL	SetValue( float fValue );
	BOOL	SetValue( double dValue );
	BOOL	SetValue( DWORD dwValue );

	CXmlNodePtr SelectSingleNode(LPCTSTR lpszPath);
	CXmlNodesPtr SelectNodes(LPCTSTR lpszPath);

	CString GetOuterXml(void) const;
	CString GetInnerXml(void) const;
};

CXmlNodes

class CXmlNodes
{
	friend class CXml;
	friend class CXmlNode;
	friend class CXmlNodes;

public:
	~CXmlNodes(void);
	CXmlNodes(void);
	CXmlNodes( const CXmlNodes & refNodes );
	CXmlNodes( CXmlNodesPtr pNodes );

	CXmlNodesPtr operator = (CXmlNodesPtr pNodes);
	CXmlNodes & operator = (const CXmlNodes & refNodes);
	CXmlNodePtr operator[] ( LONG lIndex );
	CXmlNodePtr operator[] ( LPCTSTR lpszName );

	LONG GetCount(void);
	void Release(void);

	CXmlNodePtr GetItem( LONG nIndex );
	CXmlNodePtr GetItem( LPCTSTR lpszName );

protected:
	CXmlNodes(MSXML2::IXMLDOMNodeListPtr pNodeList);
	MSXML2::IXMLDOMNodeListPtr m_pNodeList;

};

CXsl

class CXsl
{
public:
	CXsl(void);
	~CXsl(void);

	// Open XSL file
	BOOL Open(LPCTSTR lpszXslFilePath);

	// close XSL file
	void Close(void);

	// transform to file
	BOOL TransformToFile( CXml & objXml, LPCTSTR lpszFilePath);

	// add a parameter
	BOOL AddParameter( LPCTSTR lpszParamName, LPCTSTR lpszParamValue, 
			LPCTSTR lpszNamespaceURI = NULL);

protected:
	MSXML2::IXSLTemplatePtr m_pIXSLTemplate;
	MSXML2::IXMLDOMDocument2Ptr m_pStyleSheet;
	MSXML2::IXSLProcessorPtr m_pIXSLProcessor;
};

History

v2.0

Created: 2007-07-16

v2.1

Added LoadXml method

Added GetVersion method

Added const for GetXXX methods

Defined ASSERT as ATLASSERT for ATL

Defined TRACE as ATLTRACE for ATL

V2.2

Added the parameter lpszRootName for CXml::Open

Removed CXml::GetLastError

Added CXml::AddNamespace

Added two new overrides for CXml::CreateNode with namespace support

V3.0

Added another copy constructor for CXmlNode and CXmlNodes

Added const modifier for some variables

Added CXmlNode::GetInnerXml

Added CXmlNode::GetOuterXml

Added CXml::Create

Changed the MSXML version for Create to 6.0 -> 3.0 -> 5.0 -> 4.0

Added namespace support for attributes

Added a new class named CXsl

V3.1

Add method CXml::SaveWithFormatted (Thanks to roel_)

Reuse CXml::SaveStreamToFile in CXsl::TransformToFile

Add CXsl::AddParameter to allow passing parameters to XSLT

Use std::tr1::shared_ptr if exists instead of std::auto_ptr

Change namespace from Generic to JWXml

V3.2

Bug fix for the Create method usage in demo.

Upgrade to VS2010

Download source (version 3.0)

Download source (version 3.1)

Download source (version 3.2) 

http://www.codeproject.com/Articles/19624/CXml-A-Wrapping-Class-for-MSXML-3-0-4-0-5-0-6-0

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