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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++
// TryoutDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Tryout.h"
#include "TryoutDlg.h"
#include "DebugPrint.h"
#include "..\\Elmax\\StringUtils.h"
#include "..\\Elmax\\ProcessingInstruction.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CTryoutDlg dialog




CTryoutDlg::CTryoutDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTryoutDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CTryoutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CTryoutDlg, CDialog)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


// CTryoutDlg message handlers

BOOL CTryoutDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	DebugPrint text;


	//TestWrite();
	//TestRead();
	//TestWrite2();
	//TestWrite3();

	TestWrite4();

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CTryoutDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

HCURSOR CTryoutDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

// Helper function to create a DOM instance. 
HRESULT CTryoutDlg::CreateAndInitDom(MSXML2::IXMLDOMDocumentPtr& pDoc)
{
	HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));
	if (SUCCEEDED(hr))
	{
		// these methods should not fail so don't inspect result
		pDoc->async = VARIANT_FALSE;
		pDoc->validateOnParse = VARIANT_FALSE;
		pDoc->resolveExternals = VARIANT_FALSE;
		MSXML2::IXMLDOMProcessingInstructionPtr pi = pDoc->createProcessingInstruction(L"xml", L" version='1.0' encoding='UTF-8'");
		pDoc->appendChild(pi);
	}
	return hr;
}

HRESULT CTryoutDlg::OpenDOMFile(MSXML2::IXMLDOMDocumentPtr& pDoc, const std::wstring& szFile)
{
	HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));
	VARIANT_BOOL b = VARIANT_FALSE;
	if (SUCCEEDED(hr))
	{
		variant_t file(szFile.c_str());
		b = pDoc->load(file);
	}
	return b == VARIANT_FALSE ? E_FAIL : S_OK;
}

bool CTryoutDlg::SaveXml(MSXML2::IXMLDOMDocumentPtr& pDoc, const std::wstring& strFilename)
{
	TCHAR szPath[MAX_PATH];

	if(SUCCEEDED(SHGetFolderPath(NULL, 
		CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE, 
		NULL, 
		0, 
		szPath))) 
	{
		PathAppend(szPath, strFilename.c_str());
	}

	variant_t varFile(szPath);
	return SUCCEEDED(pDoc->save(varFile));
}

bool CTryoutDlg::PrettySaveXml(MSXML2::IXMLDOMDocumentPtr& pDoc, const std::wstring& strFilename)
{
	TCHAR szPath[MAX_PATH];

	if(SUCCEEDED(SHGetFolderPath(NULL, 
		CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE, 
		NULL, 
		0, 
		szPath))) 
	{
		PathAppend(szPath, strFilename.c_str());
	}

	variant_t varFile(szPath);
	Elmax::Document doc(pDoc);
	return doc.PrettySave(szPath, L"1.0", true, L"    ");

	//return SUCCEEDED(pDoc->save(varFile));
}

bool CTryoutDlg::CreateAndLoadXml(MSXML2::IXMLDOMDocumentPtr& pDoc, const std::wstring& strFilename)
{
	TCHAR szPath[MAX_PATH];

	if(SUCCEEDED(SHGetFolderPath(NULL, 
		CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE, 
		NULL, 
		0, 
		szPath))) 
	{
		PathAppend(szPath, strFilename.c_str());
	}
	else
		return false;

	HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));
	VARIANT_BOOL bLoad = VARIANT_FALSE;
	if (SUCCEEDED(hr))
	{
		variant_t varFile(szPath);
		bLoad = pDoc->load(varFile);
	}
	return bLoad == VARIANT_TRUE;
}

bool CTryoutDlg::DeleteFile(const std::wstring& strFilename)
{
	TCHAR szPath[MAX_PATH];

	if(SUCCEEDED(SHGetFolderPath(NULL, 
		CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE, 
		NULL, 
		0, 
		szPath))) 
	{
		PathAppend(szPath, strFilename.c_str());
	}
	else
		return false;

	return ::DeleteFile(szPath)==TRUE;
}

void CTryoutDlg::TestWrite()
{
	MSXML2::IXMLDOMDocumentPtr pDoc;
	HRESULT hr = CreateAndInitDom(pDoc);
	if (SUCCEEDED(hr))
	{
		using namespace Elmax;
		using namespace std;
		Element root;
		root.SetConverter(NORMAL_CONV);
		root.SetDomDoc(pDoc);

		Element all = root[L"All"];
		all[L"Version"] = 1;
		Element books = all[L"Books"].CreateNew();
		Element book1 = books[L"Book"].CreateNew();
		book1.Attribute(L"ISBN") = L"1111-1111-1111";
		book1[L"Title"] = L"2001: A Space Odyssey";
		book1[L"Price"] = 12.99f;
		book1[L"AuthorID"] = 111;

		Element book2 = books[L"Book"].CreateNew();
		book2.Attribute(L"ISBN") = L"2222-2222-2222";
		book2[L"Title"] = L"Rendezvous with Rama";
		book2[L"Price"] = 15.00f;
		book2[L"AuthorID"] = 111;

		Element book3 = books[L"Book"].CreateNew();
		book3.Attribute(L"ISBN") = L"3333-3333-3333";
		book3[L"Title"] = L"Foundation";
		book3[L"Price"] = 10.00f;
		book3[L"AuthorID"] = 222;

		Element book4 = books[L"Book"].CreateNew();
		book4.Attribute(L"ISBN") = L"4444-4444-4444";
		book4[L"Title"] = L"Currents of Space";
		book4[L"Price"] = 11.90f;
		book4[L"AuthorID"] = 222;

		Element book5 = books[L"Book"].CreateNew();
		book5.Attribute(L"ISBN") = L"5555-<5555>-&5555";
		book5[L"Title"] = L"Pebbles in the Sky";
		book5[L"Price"] = 14.00f;
		book5[L"AuthorID"] = 222;

		//books.Add(
		//	NewElement(L"Book", 
		//		NewAttribute(L"ISBN", L"7777-7777-7777"),
		//		NewElement(L"Title", L"A Scanner Darkly"),
		//		NewElement(L"Price", ToStr(15.60)), 
		//		NewElement(L"AuthorID", ToStr(333)) 
		//	)
		//);


		Element authors = all[L"Authors"].CreateNew();
		Element author = authors[L"Author"].CreateNew();
		author.Attribute(L"Name") = L"Arthur C. Clark";
		author.Attribute(L"AuthorID") = 111;
		author[L"Bio"] = L"Sci-Fic author!";
		author.AddCData(L"Random data!");

		Element author2 = authors[L"Author"].CreateNew();
		author2.Attribute(L"Name") = L"Isaac Asimov";
		author2.Attribute(L"AuthorID") = 222;
		author2[L"Bio"] = L"Sci-Fic author!";
		author2.AddComment(L"My favourite author!");

		//authors.Add(
		//	NewElement(L"Author", 
		//		NewAttribute(L"Name", L"Philip K. Dick"), 
		//		NewAttribute(L"AuthorID", L"333"), 
		//		NewElement(L"Bio", L"Sci-Fic author!")
		//	)
		//);

		std::wstring strFilename = L"Books.xml";
		//SaveXml(pDoc, strFilename);
		PrettySaveXml(pDoc, strFilename);
	}
}

void CTryoutDlg::TestRead()
{
	DebugPrint dp;
	MSXML2::IXMLDOMDocumentPtr pDoc;
	std::wstring strFilename = L"Books.xml";
	HRESULT hr = CreateAndLoadXml(pDoc, strFilename);
	if (SUCCEEDED(hr))
	{
		using namespace Elmax;
		using namespace std;
		Element root;
		root.SetConverter(NORMAL_CONV);
		root.SetDomDoc(pDoc);

		Element all = root[L"All"];
		if(all.Exists()==false)
		{
			dp.Print(L"Error: root does not exists!");
			return;
		}
		dp.Print(L"Version : {0}\n\n", all[L"Version"].GetInt32(0));

		dp.Print(L"Books\n");
		dp.Print(L"=====\n");
		Element books = all[L"Books"];
		if(books.Exists())
		{
			Element::collection_t vecBooks = books.GetCollection(L"Book");
			for(size_t i=0; i<vecBooks.size(); ++i)
			{
				dp.Print(L"ISBN: {0}\n", vecBooks[i].Attribute(L"ISBN").GetString(L"Error: None"));
				dp.Print(L"Title: {0}\n", vecBooks[i][L"Title"].GetString(L"Error: No title!"));
				dp.Print(L"Price: {0}\n", vecBooks[i][L"Price"].GetFloat(0.0f));
				dp.Print(L"AuthorID: {0}\n\n", vecBooks[i][L"AuthorID"].GetInt32(-1));
			}
		}

		dp.Print(L"Authors\n");
		dp.Print(L"=======\n");
		Element authors = all[L"Authors"];
		if(authors.Exists())
		{
			Element::collection_t vecAuthors = authors.GetCollection(L"Author");
			for(size_t i=0; i<vecAuthors.size(); ++i)
			{
				dp.Print(L"Name: {0}\n", vecAuthors[i].Attribute(L"Name").GetString(L"Error: None"));
				dp.Print(L"AuthorID: {0}\n", vecAuthors[i].Attribute(L"AuthorID").GetInt32(-1));
				dp.Print(L"Bio: {0}\n\n", vecAuthors[i][L"Bio"].GetString(L"Error: No bio!"));
			}
		}

#if _HAS_CPP0X

		auto vec = HyperElement::JoinOneToMany(authors.GetCollection(L"Author"), books.GetCollection(L"Book"), 
			[](Elmax::Element x, Elmax::Element y)->bool 
		{ 
			if(x.Attribute("AuthorID").GetString("a") == y[L"AuthorID"].GetString("a") )
			{
				return true;
			}
			return false;
		});

		for(size_t i=0; i< vec.size(); ++i)
		{
			dp.Print(L"List of books by {0}\n", vec[i].first.Attribute(L"Name").GetString(""));
			dp.Print(L"=============================================\n");
			for(size_t j=0; j< vec[i].second.size(); ++j)
			{
				dp.Print(L"{0}\n", vec[i].second[j][L"Title"].GetString("None"));
			}
			dp.Print(L"\n");
		}
#endif // _HAS_CPP0X
	}

	//DeleteFile(strFilename);
}

void CTryoutDlg::TestWrite2()
{
	MSXML2::IXMLDOMDocumentPtr pDoc;
	HRESULT hr = CreateAndInitDom(pDoc);
	if (SUCCEEDED(hr))
	{
		using namespace Elmax;
		using namespace std;

		NewElement root(L"Foods");

		root.Add(
			NewElement(L"Food",
				NewAttribute(L"Name", L"Luncheon Meat"),
				NewAttribute(L"Price", L"8.40"),
				NewAttribute(L"Category", L"Grocery"),
				NewElement(L"Manufacturer",
					NewElement(L"Address", L"Jurong, Singapore"),
					NewElement(L"Name", L"Acme Canned Food")
				)
			),
			NewElement(L"Food",
				NewAttribute(L"Name", L"Instant Noodle"),
				NewAttribute(L"Price", L"12.30"),
				NewAttribute(L"Category", L"Dried Food"),
				NewElement(L"Manufacturer",
					NewElement(L"Address", L"Ang Mo Kio, Singapore"),
					NewElement(L"Name", L"Ah Kong Food Industrial")
				)
			)
		);

		root.Add(
			NewElement(L"Food",
				NewAttribute(L"Name", L"Chocolate"),
				NewAttribute(L"Price", L"4.60"),
				NewAttribute(L"Category", L"Junk Food"),
				NewElement(L"Manufacturer",
					NewElement(L"Address", L"Henderson Road, Singapore"),
					NewElement(L"Name", L"Sweetie Food")
				)
			)
		);

		NewElement elem = root[L"Food|Manufacturer|Name"];

		if(elem.Exists())
		{
			DebugPrint dp;
			dp.Print(L"Food Manufacturer Name:{0}\n\n", elem.GetPtr()->pValue);
		}

		TCHAR szPath[MAX_PATH];

		if(SUCCEEDED(SHGetFolderPath(NULL, 
			CSIDL_LOCAL_APPDATA|CSIDL_FLAG_CREATE, 
			NULL, 
			0, 
			szPath))) 
		{
			PathAppend(szPath, L"Food1.xml");
		}

		//root.PrettySave(szPath, L"1.0", true, L"    ");
		ProcessingInstruction procInstr(false, false);
		root.PrettySave(szPath, procInstr, L"    ");

		root.Discard();

	}
}

void CTryoutDlg::TestWrite3()
{
	using namespace Elmax;

	NewElement movies(L"Movies");

	movies.Add(
		NewElement(L"Movie",
			NewAttribute(L"Name", L"Transformers: Dark of the Moon"),
			NewAttribute(L"Year", L"2011"),
			NewAttribute(L"RunningTime", ToStr(157)),
			NewElement(L"Director", L"Michael Bay"),
			NewElement(L"Stars",
				NewElement(L"Actor", L"Shia LaBeouf"),
				NewElement(L"Actress", L"Rosie Huntington-Whiteley")
			),
			NewElement(L"DVD", 
				NewElement(L"Price", L"25.00"),
				NewElement(L"Discount", ToStr(0.1)) 
			),
			NewElement(L"BluRay", 
				NewElement(L"Price", L"36.00"),
				NewElement(L"Discount", ToStr(0.1)) 
			) 
		) 
	);

	movies.Add(
		NewElement(L"Movie",
			NewAttribute(L"Name", L"Taken"),
			NewAttribute(L"Year", L"2008"),
			NewAttribute(L"RunningTime", ToStr(93)),
			NewElement(L"Director", L"Pierre Morel"),
			NewElement(L"Stars",
				NewElement(L"Actor", L"Liam Neeson"),
				NewElement(L"Actress", L"Maggie Grace")
			),
			NewElement(L"DVD", 
				NewElement(L"Price", L"20.00"),
				NewElement(L"Discount", ToStr(0.2)) 
			),
			NewElement(L"BluRay", 
				NewElement(L"Price", L"28.00"),
				NewElement(L"Discount", ToStr(0.2)) 
			) 
		) 
	);

	movies.Add(
		NewElement(L"Movie",
			NewAttribute(L"Name", L"Devil"),
			NewAttribute(L"Year", L"2010"),
			NewAttribute(L"RunningTime", ToStr(80)),
			NewElement(L"Director", L"John Erick Dowdle"),
			NewElement(L"Stars",
				NewElement(L"Actor", L"Chris Messina"),
				NewElement(L"Actor", L"Bokeem Woodbine"),
				NewElement(L"Actress", L"Caroline Dhavernas")
			),
			NewElement(L"DVD", 
				NewElement(L"Price", L"19.00"),
				NewElement(L"Discount", ToStr(0.1)) 
			),
			NewElement(L"BluRay", 
				NewElement(L"Price", L"26.00"),
				NewElement(L"Discount", ToStr(0.2)) 
			) 
		) 
	);

	movies.Add(
		NewElement(L"Movie",
			NewAttribute(L"Name", L"Pan's Labyrinth"),
			NewAttribute(L"Year", L"2006"),
			NewAttribute(L"RunningTime", ToStr(119)),
			NewElement(L"Director", L"Guillermo del Toro"),
			NewElement(L"Stars",
				NewElement(L"Actor", L"Sergi L�pez"),
				NewElement(L"Actress", L"Ivana Baquero"),
				NewElement(L"Actress", L"Ariadna Gil")
			),
			NewElement(L"DVD", 
				NewElement(L"Price", L"21.00"),
				NewElement(L"Discount", ToStr(0.2)) 
			),
			NewElement(L"BluRay", 
				NewElement(L"Price", L"27.00"),
				NewElement(L"Discount", ToStr(0.2)) 
			) 
		) 
	);

	//movies.PrettySave(L"C:\\Temp\\Movies2.xml", L"1.0", false, L"    ");
}

void CTryoutDlg::TestWrite4()
{
	Elmax::NewElement root
		( L"Sampler",
			Elmax::NewElement
				( L"Profiles",
				Elmax::NewElement
					( L"Profile",
					Elmax::NewAttribute(L"Name", L"Temperatures"),
					Elmax::NewAttribute(L"Active", L"1")
					),
			Elmax::NewElement
				( L"Profile",
				Elmax::NewAttribute(L"Name", L"Water"),
				Elmax::NewElement(L"Active", L"1")
				),
			Elmax::NewElement
				( L"Profile", L"Hello" )
			)
		);


	root.PrettySave(L"C://Test.xml", L"1.0", L"    ");
	//root.Save(L"C://Test.xml", L"1.0", 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)


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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