百度地图POI爬取写入TXT

淡淡的烟草味﹌ 2021-06-26 16:06 506阅读 0赞

using System;
    using System.IO;
    using System.Net;
    using System.Text;
    using System.Windows.Forms;
    using CCWin;
    using Newtonsoft.Json;
    
    namespace BaiduDowload
    {
        public partial class Form1 : CCSkinMain
        {
            private readonly double a = 6378245.0;
            private readonly double ee = 0.00669342162296594323;
            private readonly double PI = 3.1415926535897932384626;
            private double x_PI = 3.14159265358979324*3000.0/180.0;
    
            public Form1()
            {
                InitializeComponent();
            }
    
    
            private void btn_dowload_Click(object sender, EventArgs e)
            {
                if (tbx_query.Text != "")
                {
                    if (tbx_queryCity.Text != "")
                    {
                        if (path_text.Text != "")
                        {
                            var wc = new WebClient();
                            var fs = new FileStream(path_text.Text + "/" + tbx_query.Text + ".txt", FileMode.Append,
                                FileAccess.Write);
                            var sr = new StreamWriter(fs);
                            var city = tbx_queryCity.Text;
                            var totalnum = 20;
                            for (var i = 0; i < totalnum; i++)
                            {
                                var i_url = "http://api.map.baidu.com/place/v2/search?q=" + tbx_query.Text + "&region=" +
                                            city + "&scope=1&output=json&ak=9**************q&page_size=20&page_num=" +
                                            i + "&coord_type=1&ret_coordtype=gcj02ll";
                                var i_bResponse = wc.DownloadData(i_url);
                                var i_strResponse = Encoding.UTF8.GetString(i_bResponse);
                                try
                                {
                                    var schoolInfoList = JsonConvert.DeserializeObject<Info>(i_strResponse);
                                    var resultcount = schoolInfoList.Results.Length;
                                    for (var j = 0; j < resultcount; j++)
                                    {
                                        var mylng = Convert.ToDouble(schoolInfoList.Results[j].Location.Lng);
                                        var mylat = Convert.ToDouble(schoolInfoList.Results[j].Location.Lat);
    
                                        gcj02_wgs84(ref mylng, ref mylat);
                                        var result = j + 1 + ". " + schoolInfoList.Results[j].Name + ":" + mylng + "," +
                                                     mylat + "\n";
                                        sr.WriteLine(result); //开始写入值
    
                                        rtb_result.Text += result;
                                        rtb_result.SelectionStart = rtb_result.TextLength;
                                        rtb_result.ScrollToCaret();
                                    }
                                }
                                catch (Exception ex)
                                {
                                    Console.Write(ex);
                                    rtb_result.Text += i + 1 + "\n";
                                    sr.WriteLine(i + 1); //开始写入值
                                    rtb_result.SelectionStart = rtb_result.TextLength;
                                    rtb_result.ScrollToCaret();
                                }
                            }
                            sr.Close();
                            fs.Close();
                        }
                        else
                        {
                            MessageBox.Show("文件夹路径不能为空！");
                        }
                    }
                    else
                    {
                        MessageBox.Show("查询城市不能为空！");
                    }
                }
                else
                {
                    MessageBox.Show("查询内容不能为空！");
                }
            }
    
    
            #region GCJ02转WGS84 
            private double transformlat(double lng, double lat)
            {
                double ret;
                ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.Sqrt(Math.Abs(lng));
                ret += (20.0 * Math.Sin(6.0 * lng * PI) + 20.0 * Math.Sin(2.0 * lng * PI)) * 2.0 / 3.0;
                ret += (20.0 * Math.Sin(lat * PI) + 40.0 * Math.Sin(lat / 3.0 * PI)) * 2.0 / 3.0;
                ret += (160.0 * Math.Sin(lat / 12.0 * PI) + 320 * Math.Sin(lat * PI / 30.0)) * 2.0 / 3.0;
                return ret;
            }
    
            private double transformlng(double lng, double lat)
            {
                double ret;
                ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.Sqrt(Math.Abs(lng));
                ret += (20.0 * Math.Sin(6.0 * lng * PI) + 20.0 * Math.Sin(2.0 * lng * PI)) * 2.0 / 3.0;
                ret += (20.0 * Math.Sin(lng * PI) + 40.0 * Math.Sin(lng / 3.0 * PI)) * 2.0 / 3.0;
                ret += (150.0 * Math.Sin(lng / 12.0 * PI) + 300.0 * Math.Sin(lng / 30.0 * PI)) * 2.0 / 3.0;
                return ret;
            }
    
            private void gcj02_wgs84(ref double lng, ref double lat)
            {
                var dlat = transformlat(lng - 105.0, lat - 35.0);
                var dlng = transformlng(lng - 105.0, lat - 35.0);
                var radlat = lat / 180.0 * PI;
                var magic = Math.Sin(radlat);
                magic = 1 - ee * magic * magic;
                var sqrtmagic = Math.Sqrt(magic);
                dlat = dlat * 180.0 / (a * (1 - ee) / (magic * sqrtmagic) * PI);
                dlng = dlng * 180.0 / (a / sqrtmagic * Math.Cos(radlat) * PI);
                var mglat = lat + dlat;
                var mglng = lng + dlng;
                lng = lng * 2 - mglng;
                lat = lat * 2 - mglat;
            }
            #endregion
    
            private void writeFile(string s)
            {
                var fs = new FileStream(path_text.Text + "/" + tbx_query.Text + ".txt", FileMode.Append, FileAccess.Write);
                var sr = new StreamWriter(fs);
                sr.WriteLine(s); //开始写入值
                sr.Close();
                fs.Close();
            }
    
            private void btn_file_Click(object sender, EventArgs e)
            {
                var mFolderBrowserDialog = new FolderBrowserDialog();
                if (mFolderBrowserDialog.ShowDialog() == DialogResult.OK)
                {
                    path_text.Text = mFolderBrowserDialog.SelectedPath;
                }
            }
    
            private void rtb_result_TextChanged(object sender, EventArgs e)
            {
            }
    
            private void label3_Click(object sender, EventArgs e)
            {
            }
    
            private void 帮助ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                MessageBox.Show("先设置保存结果的文件夹，再点击下载按钮", "帮助");
            }
    
            private void 关于ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                MessageBox.Show("作者：Wu\n版权所有", "测试");
            }
    
            private void 设置保存文件夹ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                var mFolderBrowserDialog = new FolderBrowserDialog();
                if (mFolderBrowserDialog.ShowDialog() == DialogResult.OK)
                {
                    path_text.Text = mFolderBrowserDialog.SelectedPath;
                }
            }
        }
    
        #region 实体类
        public class Info
        {
            [JsonProperty("status")]
            public int Status { get; set; }
    
            [JsonProperty("message")]
            public string Message { get; set; }
    
            [JsonProperty("total")]
            public int Total { get; set; }
    
            [JsonProperty("results")]
            public Result[] Results { get; set; }
        }
    
        public class Result
        {
            [JsonProperty("name")]
            public string Name { get; set; }
    
            [JsonProperty("location")]
            public Location Location { get; set; }
    
            [JsonProperty("address")]
            public string Address { get; set; }
    
            [JsonProperty("province")]
            public string Province { get; set; }
    
            [JsonProperty("city")]
            public string City { get; set; }
    
            [JsonProperty("area")]
            public string Area { get; set; }
    
            [JsonProperty("street_id")]
            public string StreetId { get; set; }
    
            [JsonProperty("telephone")]
            public string Telephone { get; set; }
    
            [JsonProperty("detail")]
            public int Detail { get; set; }
    
            [JsonProperty("uid")]
            public string Uid { get; set; }
        }
    
        public class Location
        {
            [JsonProperty("lat")]
            public double Lat { get; set; }
    
            [JsonProperty("lng")]
            public double Lng { get; set; }
        }
        #endregion
    
    }

## 运行结果如图: ##

![这里写图片描述][20180907141322398]

![这里写图片描述][20180907141421750]

![这里写图片描述][20180907141434507]

[20180907141322398]: /images/20210626/c814c0db806646a49fd96e1273ecd4ec.png
[20180907141421750]: /images/20210626/1dd557c56f37434cb643539e8b07f874.png
[20180907141434507]: /images/20210626/68b4452b68f541158c6f3f7afe51d597.png