Building Simple Shoutcast Web Interface for Mobile Part 3

For part 2 click Building Simple Shoutcast Web Interface for Mobile Part 2

 App_Code/ScEngine.cs

using System;
using System.Data;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Data.Common;

/// 
/// Summary description for ScEngine
/// 
public class ScEngine
{
    public DataSet GetStationList(string q, string job)
    {
        q = ScEngine.ReturnAlphaNumericForSearch(q);
        q = ScEngine.LimitString(q, 30);
        DataSet ds = new DataSet();
        string genreXmlFile = ScSettings.DownloadFolder + q + ".xml";

        if (File.Exists(genreXmlFile))
        {
            FileInfo fi = new FileInfo(genreXmlFile);

            if (DateTime.Now.Subtract(fi.LastWriteTime).TotalDays > 1)
            {
                File.WriteAllText(genreXmlFile, DownloadXML(q, job), Encoding.UTF8);
            }
            // read from local file
            ds.ReadXml(genreXmlFile);

        }
        else
        {
            string newDownload = DownloadXML(q, job);
            MemoryStream mStream = new MemoryStream(ASCIIEncoding.Default.GetBytes(newDownload));
            File.WriteAllText(genreXmlFile, newDownload, Encoding.UTF8);
            ds.ReadXml(mStream);
        }



        return ds;

    }
    public string DownloadXML(string q, string job)
    {
        string url = (job == "search") ? ScSettings.strURLsearch + q : ScSettings.strURLbrowse + q;

        StringBuilder sb = new StringBuilder();
        string tempString = null;
        int count = 0;
        byte[] buf = new byte[8192];
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Timeout = 4000; request.Accept = "*/*"; 
        request.Method = "GET"; 
        request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; .NET CLR 3.5.30729; .NET CLR";
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream resStream = response.GetResponseStream();
        do
        {
            count = resStream.Read(buf, 0, buf.Length);
            if (count != 0)
            {
                tempString = Encoding.UTF8.GetString(buf, 0, count);
                sb.Append(tempString);
            }
        }
        while (count > 0);

        return sb.ToString();
    }
    public static int ReturnNumeric(string input)
    {
        if (String.IsNullOrEmpty(input) == true)
        {
            return 0;
        }
        else
        {
            try
            {
                return Convert.ToInt32(input);
            }
            catch
            {
                return 0;
            }
        }
    }
    public static string ReturnAlphaNumeric(string input)
    {
        if (String.IsNullOrEmpty(input) == true)
        {
            return string.Empty;
        }
        else
        {
            try
            {
                return Regex.Replace(input, @"[^a-zA-Z0-9\.\-_]", "_").ToString();
            }
            catch
            {
                return string.Empty;
            }
        }
    }
    public static string ReturnAlphaNumericForSearch(string input)
    {
        if (String.IsNullOrEmpty(input) == true)
        {
            return string.Empty;
        }
        else
        {
            try
            {
                return Regex.Replace(input, @"[^a-zA-Z0-9\.\-_]", " ").ToString();
            }
            catch
            {
                return string.Empty;
            }
        }
    }
    public static string LimitString(string strToLimit, int limitTo)
    {
        if (strToLimit != null && strToLimit.Length > 0)
        {
            strToLimit = strToLimit.Trim();

            if (strToLimit.Length > limitTo)
            {
                return strToLimit.Substring(0, limitTo);
            }
            else
            {
                return strToLimit;
            }
        }
        return strToLimit;
    }
    public static void DeleteOldXML(int days)
    {
        try
        {
            // used in global.asax app start
            DateTime KeepDate = DateTime.Now.AddDays(days);
            DirectoryInfo fileListing = new DirectoryInfo(ScSettings.DownloadFolder);
            foreach (FileInfo f in new DirectoryInfo(ScSettings.DownloadFolder).GetFiles())
            {
                if (f.LastWriteTime <= KeepDate && f.Extension.ToLower() == ".xml")
                    f.Delete();
            }
        }
        catch
        {
        }

    }
}

App_Code/ScGenres.cs

using System;
using System.Data;
using System.IO;
using System.Web;

/// 
/// Summary description for ShoutCastCategoreies
/// 
public class ScGenres
{
    public DataSet GetGenres()
    {

        string myXMLfile = HttpContext.Current.Server.MapPath("~/App_Data/Genres.xml");
        DataSet ds = new DataSet();
        if (HttpContext.Current.Cache["SCGenres"] == null)
        {
            FileStream fsReadXml = new FileStream
                (myXMLfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            try
            {
                ds.ReadXml(fsReadXml);
                //HttpContext.Current.Cache["Genres"] = ds;
                HttpContext.Current.Cache.Insert("SCGenres", ds, null,
                            System.Web.Caching.Cache.NoAbsoluteExpiration,
                            TimeSpan.FromMinutes(60));
                return ds;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                fsReadXml.Close();
            }
        }
        else
        {
            ds = (DataSet)HttpContext.Current.Cache["SCGenres"]; ;
            return ds;
        }
    }
}

App_Code/ScSettings.cs

/// 
/// Summary description for Settings
/// 
using System.Web;
public class ScSettings
{
    public ScSettings()
    {

    }

    public static string strURLsearch = "http://www.shoutcast.com/sbin/newxml.phtml?search=";
    public static string strURLbrowse = "http://www.shoutcast.com/sbin/newxml.phtml?genre=";
    public static string DownloadFolder = HttpContext.Current.Server.MapPath("~/App_Data/Downloads/");

}