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Articles / Programming Languages / Visual C++ 10.0

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

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12 Apr 2016Ms-PL11 min read 43.3K   500   29  
Linq-To-XML Node Creation for Native C++
// RootElement.cpp
//
// written by: PJ Arends
// Modified by: Wong Shao Voon
// License Ms-PL

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

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::runtime_error("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;

		if (FileExists(FilePath))
		{   // 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)
{
	if (FileExists(FilePath))
	{
		return OverWrite;
	}

	std::wstring Folder = GetFolder(FilePath);

	if (FolderExists(Folder))
	{
		return true;
	}

	if (CreateFolder)
	{
		return CreateDirectory(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;
}

bool RootElement::FileExists(const std::wstring& fileName)
{
	DWORD fileAttr = GetFileAttributes(fileName.c_str());
	if (INVALID_FILE_ATTRIBUTES == fileAttr)
		return false;

	return true;
}

bool RootElement::FolderExists(const std::wstring& Path)
{
	DWORD dwAttrib = GetFileAttributes(Path.c_str());

	return (dwAttrib != INVALID_FILE_ATTRIBUTES && 
		(dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
}

std::wstring RootElement::GetFolder(const std::wstring& FilePath)
{
	std::wstring Folder = L"";
	size_t pos = FilePath.find_last_of(L'\\');
	if(pos!=-1)
		Folder = FilePath.substr(0, pos);

	return Folder;
}

bool RootElement::CreateDirectory(const std::wstring& dd)
{
	HANDLE		fFile;					// File Handle
	WIN32_FIND_DATA fileinfo;			// File Information Structure
	std::vector<std::wstring>	arr;				// CString Array to hold Directory Structures
	BOOL tt;							// BOOL used to test if Create Directory was successful
	size_t x1 = 0;							// Counter
	std::wstring tem = L"";					// Temporary CString Object

	// Before we go to a lot of work.  
	// Does the file exist

	fFile = FindFirstFile(dd.c_str(),&fileinfo);

	// if the file exists and it is a directory
	if(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
	{
		//  Directory Exists close file and return
		FindClose(fFile);
		return TRUE;
	}

	arr.clear();					// Not really necessary - Just habit
	for(x1=0;x1<dd.length();x1++)	// Parse the supplied CString Directory String
	{									
		if(dd.at(x1) != L'\\')		// if the Charachter is not a \ 
			tem += dd.at(x1);		// else add character to Temp String
		else
		{
			arr.push_back(tem);				// if the Character is a \ Add the Temp String to the CString Array
			tem.append(L"\\");				// Now add the \ to the temp string
		}
		if(x1 == dd.length()-1)		// If we reached the end of the file add the remaining string
			arr.push_back(tem);
	}


	// Close the file
	FindClose(fFile);

	// Now lets cycle through the String Array and create each directory in turn
	for(x1 = 1;x1<arr.size();x1++)
	{
		tem = arr[x1];
		tt = ::CreateDirectory(tem.c_str(),NULL);

		// If the Directory exists it will return a false
		if(tt)
			SetFileAttributes(tem.c_str(),FILE_ATTRIBUTE_NORMAL);
		// If we were successful we set the attributes to normal
	}
	arr.clear();
	//  Now lets see if the directory was successfully created
	fFile = FindFirstFile(dd.c_str(),&fileinfo);

	// if the file exists and it is a directory
	if(fileinfo.dwFileAttributes == FILE_ATTRIBUTE_DIRECTORY)
	{
		//  Directory Exists close file and return
		FindClose(fFile);
		return true;
	}
	else
	{
		FindClose(fFile);
		return false;
	}
}

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License

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


Written By
Software Developer (Senior)
Singapore Singapore
Shao Voon is from Singapore. His interest lies primarily in computer graphics, software optimization, concurrency, security, and Agile methodologies.

In recent years, he shifted focus to software safety research. His hobby is writing a free C++ DirectX photo slideshow application which can be viewed here.

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