Soundcloud Downloader

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Net;
using System.Text.RegularExpressions;




namespace SoundcloudDownloader
{
    public partial class Form1 : Form
    {
        MatchCollection links;
        MatchCollection nameOfTracks;
        List<string> listOfLinks = new List<string>();
        List<int> selectedTracks = new List<int>();

        public Form1()
        {
            InitializeComponent();

        }


        private void Form1_Load(object sender, EventArgs e)
        {
            CheckForIllegalCrossThreadCalls = false;
            btnDownloadAll.Enabled = false;
            btnDownloadSelected.Enabled = false;

        }

        private void btnDownload_Click(object sender, EventArgs e)
        {
            if (folderBrowserDialog1.SelectedPath == "")
            {
                MessageBox.Show("Set Download Folder!");

            }
            else if(txtLink.Text == "Enter Soundcloud Link" || txtLink.Text == "")
            {
                MessageBox.Show("Enter Soundcloud Link.");
            }
            else
            {
                GetTracks();
                btnDownloadAll.Enabled = true;
                btnDownloadSelected.Enabled = true;
            }
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {

            folderBrowserDialog1.ShowDialog();
            txtDownloadLocation.Text = folderBrowserDialog1.SelectedPath.ToString();

        }

        private void btnGetTracks_Click(object sender, EventArgs e)
        {
            MethodInvoker simpleTest = new MethodInvoker(DownloadAllTracks);


                simpleTest.BeginInvoke(null, null);

        }





        void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            double bytesIn = double.Parse(e.BytesReceived.ToString());
            double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
            double percentage = bytesIn / totalBytes * 100;

            progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
        }

        void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)

   {

      // MessageBox.Show("Track Downloaded");

   }

        private void progressBar1_Click(object sender, EventArgs e)
        {

        }

        void GetTracks()
        {
            // used to build entire input
            StringBuilder sb = new StringBuilder();

            // used on each read operation
            byte[] buf = new byte[8192];

            // prepare the web page we will be asking for
            HttpWebRequest request = (HttpWebRequest)
                WebRequest.Create(txtLink.Text.ToString());

            // execute the request
            HttpWebResponse response = (HttpWebResponse)
                request.GetResponse();


            // we will read data via the response stream
            Stream resStream = response.GetResponseStream();

            string tempString = null;
            int count = 0;

            do
            {
                // fill the buffer with data
                count = resStream.Read(buf, 0, buf.Length);

                // make sure we read some data
                if (count != 0)
                {
                    // translate from bytes to ASCII text
                    tempString = Encoding.ASCII.GetString(buf, 0, count);

                    // continue building the string
                    sb.Append(tempString);
                }
            }
            while (count > 0); // any more data to read?

            // print out page source

            string searchString = sb.ToString();


            links = Regex.Matches(searchString, "((http:[/][/])(media.soundcloud.com/stream/)([a-z]|[A-Z]|[0-9]|[/.]|[~]|[?]|[_]|[=])*)");

            nameOfTracks = Regex.Matches(searchString, "(?<=\"title\":\")[^\"]+");

            for (int i = 0; i < links.Count; i++)
            {

                lstTracks.Items.Add(nameOfTracks[i].ToString());
            }

        }

        private void btnDownloadSelected_Click(object sender, EventArgs e)
        {
            WebClient wc = new WebClient();


          for(int i = 0; i < selectedTracks.Count;i++)
            {
                int selectedTrackIndex;
                selectedTrackIndex = selectedTracks[i];
                string url;
                url = links[selectedTrackIndex].ToString();



                if (!wc.IsBusy)
                {

                    try
                    {
                        wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
                        wc.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
                        wc.DownloadFileAsync(new Uri(url), folderBrowserDialog1.SelectedPath.ToString() + "\\" + nameOfTracks[selectedTrackIndex].ToString() + ".mp3");

                        i++;
                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                }
            }



        }

        private void button1_Click(object sender, EventArgs e)
        {
            Console.WriteLine(lstTracks.CheckedItems.Count);

        }

        private void btnQuit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void txtLink_TextChanged(object sender, EventArgs e)
        {

        }

        void DownloadAllTracks()
        {


            WebClient wc = new WebClient();
            if (txtDownloadLocation.Text == folderBrowserDialog1.SelectedPath.ToString())
            {
                for (int i = 0; i < links.Count; )
                {
                    string url;
                    url = links[i].ToString();


                    if (!wc.IsBusy)
                    {

                        try
                        {


                            wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);

                            wc.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);


                            wc.DownloadFileAsync(new Uri(url), folderBrowserDialog1.SelectedPath.ToString() + "\\" + nameOfTracks[i].ToString() + ".mp3");




                            i++;
                        }

                        catch (Exception ex)
                        {
                            throw ex;
                        }
                    }

                }

            }
            else
            {
                MessageBox.Show("No Valid Tracks Found.");
            }

        }

        private void lstTracks_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {


        }

        private void lstTracks_ItemChecked(object sender, ItemCheckedEventArgs e)
        {
            if (e.Item.Checked)
            {
                selectedTracks.Add(e.Item.Index);
            }
            else
            {
                selectedTracks.Remove(e.Item.Index);
            }

        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            lstTracks.Clear();
            links = Regex.Matches("","");
            nameOfTracks = Regex.Matches("", "");
            btnDownloadAll.Enabled = false;
            btnDownloadSelected.Enabled = false;
        }

        private void btnAbout_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Soundcloud Downloader V1.0 by Steven Crangle\nEmail: [email protected]");
        }






    }
}