如何从iTunes搜索API中过滤音频播客？

Question

通过在iTunes API（http://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html）中搜索播客，结果包含音频和视频播客。有没有办法仅从API中检索音频播客？

提前感谢你的帮助 :-)

- Mariusz

Answer 1

从文档中看来，似乎无法过滤音频和视频播客；但是，您可以循环遍历结果项并检查每个项是否为音频或视频以进行过滤。您可以通过从RSS提要中获取其他信息或使用subscribePodcast URL（请参见示例）向iTunes发出另一个调用来实现这一点。

使用System;
使用System.Collections.Generic;
使用System.Linq;
使用System.Text;
使用System.Net;
使用System.Web.Script.Serialization;
使用System.Xml.Linq;
使用System.IO;
命名空间ConsoleTest
{
    类Program
    {
        静态void Main(string[] args)
        {
//搜索Windows Weekly
            string url = "https://itunes.apple.com/search?term=Windows%20Weekly&media=podcast&attibute=audio";
string json = FetchHTML(url);
JavaScriptSerializer s = new JavaScriptSerializer();
            var result = s.Deserialize(json);
var audioOnly = new List();
foreach (var item in result.Results)
            {
if (!IsVideo(item.TrackId))
                {
                    audioOnly.Add(item);
                }
}
foreach (var au in audioOnly)
            {
                Console.WriteLine(au.TrackName);
            }
Console.ReadLine();
        }
静态bool IsVideo(string id)
        {
            string req = "https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/com.apple.jingle.app.finance.DirectAction/subscribePodcast?id=" + id + "&wasWarnedAboutPodcasts=true";
string xml = FetchHTML(req,true);
bool isVideo = false;
var re = XElement.Load(new StringReader(xml)).Elements("dict").Elements("dict");
bool next = false;
            foreach (var e in re.Elements())
            {
                if (next)
                {
                    //这是视频值
                    isVideo = e.Name.LocalName.Trim().ToLower() == "true";
                    next = false;
                    break;
                }
                if (e.Value == "is-video")
                {
                    next = true;
                }
            }
return isVideo;
        }
静态string FetchHTML(string url,bool doItAsITunes = false)
        {
            string htmlCode = "";
使用(WebClient client = new WebClient())
            {
                if (doItAsITunes)
                {
                    client.Headers.Add("user-agent", "iTunes/9.1.1");
                }
htmlCode = client.DownloadString(url);
            }
返回htmlCode;
        }
}
公共类SearchResult
    {
        public SearchResult()
        {
            Results = new List();
        }
 public int ResultCount { set; get; }
        public List Results { set; get; }
    }
公共类Item
    {
        public Item()
        {
            GenreIDs = new List();
            Genres = new List();
}
 public string WrapperType { set; get; }
        public string Kind { set; get; }
        public string ArtistID { set; get; }
        public string CollectionID { set; get; }
        public string TrackId { set; get; }
        public string ArtistName { set; get; }
        public string CollectionName { set; get; }
        public string TrackName { set; get; }
        public string CollectionCensoredName { set; get; }
        public string TrackCensoredName { set; get; }
        public string ArtistViewUrl { set; get; }
        public string FeedUrl { set; get; }
        public string TrackViewUrl { set; get; }
        public string PreviewUrl { set; get; }
        public string ArtworkUrl60 { set; get; }
        public string ArtworkUrl100 { set; get; }
        public float CollectionPrice { set; get; }
        public float TrackPrice { set; get; }
        public string CollectionExplicitness { set; get; }
        public string TrackExplicitness { set; get; }
        public string DiscCount { set; get; }
        public string DiscNumber { set; get; }
        public string TrackCount { set; get; }
        public string TrackNumber { set; get; }
        public string TrackTimeMillis { set; get; }
        public string Country { set; get; }
        public string Currency { set; get; }
        public string PrimaryGenreName { set; get; }
        public List GenreIDs { set; get; }
        public List Genres { set; get; }
    }
}

- Walter Soto

Answer 2

是的。在常规搜索中，您可以获得所有内容： https://itunes.apple.com/search?term=jack+johnson

但是您可以添加一些参数来请求例如（针对您的情况）

&entity=song

因此请求将是：

https://itunes.apple.com/search?term=jack+johnson&entity=song

更多内容请查看this docs中的搜索部分。

- Jakub