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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Net;

using System.Text;

using System.Text.RegularExpressions;

using System.Threading;

using System.Windows.Forms;

namespace ImageCollection

{

    public partial class Form1 : Form

    {

        private static string Path = AppDomain.CurrentDomain.BaseDirectory + "img";

        public Form1()

        {

            InitializeComponent();

        }

        private void btnshuaqu_Click(object sender, EventArgs e)

        {

            string url = txturl.Text.Trim();

            if (string.IsNullOrEmpty(url))

            {

                MessageBox.Show("請輸入URl");

                return;

            }

            txtimg.AppendText("開始抓取中:\r\n");

            Thread th = new Thread(() => ShuaQu(url)) { IsBackground = true };

            th.Start();

        }

        private void ShuaQu(string url)

        {

            DirectoryInfo di = new DirectoryInfo(Path);

            if (System.IO.Directory.Exists(Path))

            {

                di.Delete(true);

            }

            System.IO.Directory.CreateDirectory(Path);

            string result = WebHttp.HttpGet(url, null, 3);

            string[] str = GetHtmlImageUrlList(result);

            txtimg.Invoke(new Action(() =>

            {

                txtimg.AppendText("已經獲取到數據!"+str.Count() + "\r\n");

            }));

            //建立獲取網頁標題正則表達式  

            String regex = @"<title>.+</title>";

            //返回網頁標題  

            String title = Regex.Match(result, regex).ToString();

            txttitle.Invoke(new Action(() => {

                txttitle.Text = Regex.Replace(title, @"[\""]+", ""); 

            }));

            foreach (string s in str)

            {

                Uri u = new Uri(s);

                if (u.Host == "www.xxx.com")

                {

                    Thread downimg = new Thread(() => Get_img(s)) { IsBackground = true };

                    downimg.Start();

                    txtimg.Invoke(new Action(() => {

                        txtimg.AppendText(s + "\r\n");

                    }));

                } 

            }

            txtimg.Invoke(new Action(() =>

            {

                txtimg.AppendText("全部抓取完成!\r\n");

            }));

        }

        public void Get_img(string imgpath)

        {

            string[] file = imgpath.Split('?');

            string name = System.IO.Path.GetFileName(file[0]);

            WebClient mywebclient = new WebClient();

            mywebclient.DownloadFile(imgpath, Path + @"\" + name);

            //Bitmap img = null;

            //HttpWebRequest req;

            //HttpWebResponse res = null;

            //try

            //{

            //    System.Uri httpUrl = new System.Uri(imgpath);

            //    req = (HttpWebRequest)(WebRequest.Create(httpUrl));

            //    req.Timeout = 180000; //設置超時值10秒

            //    req.UserAgent = "XXXXX";

            //    req.Accept = "XXXXXX";

            //    req.Method = "GET";

            //    res = (HttpWebResponse)(req.GetResponse());

            //    img = new Bitmap(res.GetResponseStream());//獲取圖片流                

            //    img.Save(Path + @"\"+name);//隨機名

            //}

            //catch (Exception ex)

            //{

            //    string aa = ex.Message;

            //}

            //finally

            //{

            //    res.Close();

            //}

        }

        /// <summary> 

        /// 取得HTML中所有圖片的 URL。 

        /// </summary> 

        /// <param name="sHtmlText">HTML代碼</param> 

        /// <returns>圖片的URL列表</returns> 

        private string[] GetHtmlImageUrlList(string sHtmlText)

        {

            // 定義正則表達式用來匹配 img 標簽 

            Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);

            // 搜索匹配的字符串 

            MatchCollection matches = regImg.Matches(sHtmlText);

            int i = 0;

            string[] sUrlList = new string[matches.Count];

            // 取得匹配項列表 

            foreach (Match match in matches)

                sUrlList[i++] = match.Groups["imgUrl"].Value;

            return sUrlList;

        }

    }

}

#region 下載圖片到Image

public static Image UrlToImage(string url) {

    WebClient mywebclient = new WebClient();

    byte[] Bytes = mywebclient.DownloadData(url);

    using (MemoryStream ms = new MemoryStream(Bytes)) {

        Image outputImg = Image.FromStream(ms);

        return outputImg;

    }

}

#endregion