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Linq-To-XML Style of Node Creation for C++

, 7 Jun 2012
Linq-To-XML Node Creation for Native C++
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// RootElement.cpp
//
// written by: PJ Arends
// License Ms-PL

#include "stdafx.h"
#include "RootElement.h"
using namespace Elmax;

#include <boost/Filesystem.hpp>
using namespace boost::filesystem;

bool RootElement::LoadFile(const std::wstring &FilePath)
{
	bool retval(false);

	UnloadFile();

	HRESULT hr = m_ptrDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));

#ifdef _DEBUG
	if (hr == CO_E_NOTINITIALIZED)
	{
		throw std::exception("CoInitialize has not been called for this thread");
	}
#endif

	if (SUCCEEDED(hr))
	{
		retval = true;

		m_ptrDoc->async = VARIANT_FALSE;
		m_ptrDoc->validateOnParse = VARIANT_FALSE;
		m_ptrDoc->resolveExternals = VARIANT_FALSE;

		path Path(FilePath);
		if (exists(Path) && is_regular_file(Path))
		{   // Open existing file
			variant_t varFile(FilePath.c_str());

			// load will fail if the file has malformed xml
			if (m_ptrDoc->load(varFile) != VARIANT_TRUE)
			{
				retval = false;
			}
		}

		if (retval)
		{
			SetConverter(REGEX_CONV);
			SetDomDoc(m_ptrDoc);
			m_FilePath = FilePath;
		}
	}

	return retval;
}
bool RootElement::CanWriteFile(const std::wstring& FilePath, bool OverWrite, bool CreateFolder)
{
	path Path(FilePath);
	if (exists(Path))
	{
		if (is_regular_file(Path))
		{
			return OverWrite;
		}
		return false;
	}

	path Folder = Path.parent_path();
	if (exists(Folder))
	{
		return true;
	}

	if (CreateFolder)
	{
		return create_directories(Folder);
	}

	return false;
}

bool RootElement::SaveFile(const std::wstring& FilePath, bool OverWrite, bool CreateFolder)
{
	if (NULL == m_ptrDoc)
	{
		return false;
	}

	if (!FilePath.empty())
	{
		m_FilePath = FilePath;
	}

	if (CanWriteFile(m_FilePath, OverWrite, CreateFolder))
	{
		variant_t varFile(m_FilePath.c_str());
		Elmax::Document doc(m_ptrDoc);
		return doc.PrettySave(m_FilePath, L"1.0", true);
	}

	return false;
}

bool RootElement::UnloadFile()
{
	m_ptrDoc = NULL;  // calls Release() for us
	m_FilePath.clear();
	return true;
}

RootElement::~RootElement()
{
	UnloadFile();
}

RootElement& RootElement::operator = (const RootElement &other)
{
	UnloadFile();
	Element::operator=(other);
	m_FilePath = other.m_FilePath;

	return *this;
}

bool RootElement::SetFilePath(std::wstring FilePath)
{
	if (NULL == m_ptrDoc)
	{
		return false;
	}

	m_FilePath = FilePath;
	return true;
}

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

About the Author

SV Wong
Software Developer
Singapore Singapore

Currently into areas like 3D graphics and application security. Hoping to revisit the cryptography and design pattern topics if time permits.


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