Unraveling the Netflix API - Part I - Netflix API Basics

/*
 * Netflix API Basics
 * Copyright (c) 2009 Dave Cook Consulting, LLC
 *                    http://www.netdave.com
 * 
 * This code released under the Code Project Open License
 * http://www.codeproject.com/info/cpol10.aspx
 * 
 */

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

namespace NetflixAPIBasics
{
	public partial class frmMain : Form
	{
		public frmMain()
		{
			InitializeComponent();
		}

		private void btnSearch_Click(object sender, EventArgs e)
		{
			if (txtKey.Text.Length == 0 || txtSecret.Text.Length == 0)
			{
				MessageBox.Show("You must provide both a Consumer Key and Consumer Secret.");
				return;
			}
			if (txtSearch.Text.Length == 0)
			{
				txtSearch.Text = "<Enter a search title>";
				return;
			}

			OAuth.OAuthBase oauth = new OAuth.OAuthBase();

			// add inputs
			Uri requestUrl = new Uri("http://api.netflix.com/catalog/titles/");
			oauth.AddQueryParameter("term", txtSearch.Text);
			oauth.AddQueryParameter("max_results", udMaxResults.Value.ToString());

			// prepare outputs
			string normalizedUrl;
			string normalizedRequestParameters;

			// generate request signature
			string sig = oauth.GenerateSignature(requestUrl,
												 txtKey.Text, txtSecret.Text,
												 null, null,		// token , tokenSecret (not needed)
												 "GET", oauth.GenerateTimeStamp(), oauth.GenerateNonce(),
												 out normalizedUrl, out normalizedRequestParameters);
			// construct request
			txtRequest.Text = requestUrl + "?" +
							normalizedRequestParameters +
							"&oauth_signature=" + oauth.UrlEncode(sig);
			// make request
			string results = "";
			Cursor.Current = Cursors.WaitCursor;
			try
			{
				WebRequest req = WebRequest.Create(txtRequest.Text);
				WebResponse rsp = req.GetResponse();
				StreamReader sr = new StreamReader(rsp.GetResponseStream());
				results = sr.ReadToEnd();
				rsp.Close();
			}
			catch (Exception ex)
			{
				txtRequest.Text = "Request failed: " + ex.Message;
				Cursor.Current = Cursors.Default;
				return;
			}

			// display the results
			string fna = "Results.xml";
			StreamWriter sw = new StreamWriter(fna);
			sw.Write(results);
			sw.Close();
			// webBrowser ctl doesn't know where we're executing
			int pathLen = Application.ExecutablePath.LastIndexOf('\\');
			string path = Application.ExecutablePath.Substring(0, pathLen + 1);
			webResults.Navigate(path + fna);
			Cursor.Current = Cursors.Default;
		}
	}
}