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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++
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;

namespace Elmax
{
    public class RootElement : Element
    {
        /// <summary>
        /// Can the file be written to?
        /// </summary>
        /// <param name="FilePath">the fully qualified file and path name for the file</param>
        /// <param name="OverWrite">true if the existing file can be overwritten</param>
        /// <param name="CreateFolder">true to create the folders if they are not already there</param>
        /// <returns></returns>
        protected bool CanWriteFile(string FilePath, bool OverWrite, bool CreateFolder)
        {
	        if (File.Exists(FilePath))
	        {
		        return OverWrite;
	        }

            string Folder = Path.GetDirectoryName(FilePath);

            try
            {
                DirectoryInfo dirInfo = new DirectoryInfo(Folder);
                if(dirInfo.Exists)
                    return true;
            }
            catch (System.Exception)
            {
            	
            }

	        if (CreateFolder)
	        {
		        DirectoryInfo dirInfoFolder = Directory.CreateDirectory(Folder);

                return dirInfoFolder.Exists;
	        }

	        return false;

        }
        /// <summary>
        /// Constructor loads the supplied file if it exists or creates an empty XML DOM if it does not
        /// </summary>
        /// <param name="FilePath"></param>
        public RootElement(string FilePath = "") 
            : base()
        { 
            LoadFile(FilePath); 
        }
        
        /// <summary>
        /// Load a XML file
        /// </summary>
        /// <param name="FilePath">loads the supplied file</param>
        /// <returns>return true if successful</returns>
        public bool LoadFile(string FilePath = "")
        {
            UnloadFile();

            _Doc = new XmlDocument();

            if (File.Exists(FilePath))
            {
                _Doc.Load(FilePath);
            }

            SetDomDoc(_Doc);
            m_FilePath = FilePath;

            return true;
        }

		//! 
        /// <summary>
        /// Check if a file is loaded into the object
        /// </summary>
        /// <returns>returns true if file is loaded</returns>
        public bool IsFileLoaded() 
        { 
            return null != _Doc; 
        }

        /// <summary>
        /// Unload the file from memory - it is NOT saved first
        /// </summary>
        /// <returns>always true</returns>
        public bool UnloadFile()
        {
            _Doc = null;  // calls Release() for us
            m_FilePath = string.Empty;
            return true;
        }
        
        /// <summary>
        /// Get the path to the XML file
        /// </summary>
        /// <returns>XML File Path</returns>
        public string GetFilePath() 
        { 
            return m_FilePath; 
        }

        /// <summary>
        /// Set a new path for the XML file
        /// </summary>
        /// <param name="FilePath">XML File Path</param>
        /// <returns>false if no document is currently loaded</returns>
        public bool SetFilePath(string FilePath)
        {
            if (null == _Doc)
            {
                return false;
            }

            m_FilePath = FilePath;
            return true;
        }

        /// <summary>
        /// Save the file, specify a new path to change the files name and/or location
        /// </summary>
        /// <param name="FilePath">the fully qualified file and path name for the file</param>
        /// <param name="OverWrite">true if the existing file can be overwritten</param>
        /// <param name="CreateFolder">true to create the folders if they are not already there</param>
        /// <returns>true if the file was successfully saved</returns>
        public bool SaveFile(string FilePath = "", bool OverWrite = true, bool CreateFolder = false)
        {
	        if (null == _Doc)
	        {
		        return false;
	        }

	        if (string.IsNullOrEmpty(FilePath)==false)
	        {
		        m_FilePath = FilePath;
	        }

	        if (CanWriteFile(m_FilePath, OverWrite, CreateFolder))
	        {
		        Elmax.Document doc = new Elmax.Document(_Doc);
		        return doc.PrettySave(m_FilePath);
	        }

	        return false;
        }

        /// <summary>
		/// File path name for the XML document
		/// </summary>
        private string m_FilePath;

    }
}

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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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