cscの作法 その34 xml

概要

cscの作法、調べてみた。
練習問題やってみた。

練習問題

dbpediaにsparql投げてxmlを取得せよ。

写真

サンプルコード

using System;
using System.Windows.Forms;
using System.Drawing;
using System.Net;
using System.Web;
using System.IO;
using System.Text;
using System.Xml;


class form1: Form {
	form1() {
		Text = "dbpedia";
		ClientSize = new Size(200, 200);
		Button btn1 = new Button();
		btn1.Location = new Point(50, 50);
		btn1.Text = "test";
		btn1.Click += btn1_Click;
		Controls.AddRange(new Control[] {
			btn1
		});
	}
	void btn1_Click(object sender, System.EventArgs e) {
		WebRequest request = WebRequest.Create("http://ja.dbpedia.org/sparql");
		request.Method = "POST";
		string postData = "SELECT DISTINCT * WHERE { dbpedia-ja:デ・トマソ dbpedia-owl:abstract ?abstract .}";
		postData = "query=" + HttpUtility.UrlEncode(postData);
		Console.WriteLine(postData);
		byte[] byteArray = Encoding.UTF8.GetBytes(postData);
		request.ContentType = "application/x-www-form-urlencoded";
		request.ContentLength = byteArray.Length;
		Stream dataStream = request.GetRequestStream();
		dataStream.Write(byteArray, 0, byteArray.Length);
		dataStream.Close();
		WebResponse response = request.GetResponse();
		Console.WriteLine(((HttpWebResponse) response).StatusDescription);
		using (dataStream = response.GetResponseStream()) {
			StreamReader reader = new StreamReader(dataStream);
			XmlDocument xmlDoc = new XmlDocument();
			xmlDoc.Load(reader);
			XmlElement rootElement = xmlDoc.DocumentElement;
			XmlNodeList nodelist = rootElement.GetElementsByTagName("literal");
			MessageBox.Show(nodelist.Item(0).InnerText);
		}
		response.Close();
	}
	[STAThread]
	public static void Main() {
		Application.Run(new form1());
	}
}

以上。