百度Mp3的API在windows phone 7中的使用
最近重新写了一个音乐的播放器。其中用到了百度音乐的API：http://cloud21.iteye.com/blog/611914由于百度MP3的API的地址和我们请求的到得XML文件都是GB2312编码的。所以遇到了点麻烦。好了废话不说，上代码。
namespace BaiduAPI_test
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
}
public class MusicUpdateState
{
public HttpWebRequest AsyncRequest { get; set; }
public HttpWebResponse AsyncResponse { get; set; }
}
private void btn_search_Click(object sender, RoutedEventArgs e)
{
//string gb_songname = utf_8_to_gb2312(SongName.Text);
//string gb_singername = utf_8_to_gb2312(SingerName.Text);
//由于百度的地址是用GB2312编码的，所以要用HttpUtility.UrlEncode这个函数来编码
string songname = HttpUtility.UrlEncode(SongName.Text);
string singername = HttpUtility.UrlEncode(SingerName.Text);
string Uri = "http://box.zhangmen.baidu.com/x?op=12&count=1&title=" + songname + "$$" + singername + "$$$$";
UriBuilder fullUri = new UriBuilder(Uri);
HttpWebRequest musicRequest = (HttpWebRequest)WebRequest.Create(fullUri.Uri);
MusicUpdateState musicState = new MusicUpdateState();
musicState.AsyncRequest = musicRequest;
musicRequest.BeginGetResponse(new AsyncCallback(HandleMusicResponse), musicState);
}
private void HandleMusicResponse(IAsyncResult asyncResult)
{
MusicUpdateState musicState = (MusicUpdateState)asyncResult.AsyncState;
HttpWebRequest musicRequest = (HttpWebRequest)musicState.AsyncRequest;
musicState.AsyncResponse = (HttpWebResponse)musicRequest.EndGetResponse(asyncResult);
Stream streamResult;
string encode = "";
string decode = "";
streamResult = musicState.AsyncResponse.GetResponseStream();
//这里也是一样的，请求得到的XML是用GB2312编码的，直接用XmlReader读取Stream的话会提示系统不支持GB2312编码
var sr = new StreamReader(streamResult);
string srResult = sr.ReadToEnd();
//----Test----------
//Dispatcher.BeginInvoke(() =>
// {
// tb_decode.Text = srResult;
// });
using (XmlReader reader = XmlReader.Create(new StringReader(srResult)))
{
reader.ReadToFollowing("encode");
encode = reader.ReadElementContentAsString();
//百度地址中间的数字是7位或者8位的，所以要判断最后一个是不是数字
string encodeUrl = encode.Substring(44,8);
string lastNumberUri = IsNumber(encodeUrl);
reader.ReadToFollowing("decode");
decode = reader.ReadElementContentAsString();
UriBuilder fullUri = new UriBuilder("http://zhangmenshiting.baidu.com/data/music/" + lastNumberUri + "/" + decode);
Dispatcher.BeginInvoke(() =>
{
BaiduMusicElement.Source = fullUri.Uri;
BaiduMusicElement.AutoPlay = true;
BaiduMusicElement.Position = TimeSpan.FromMilliseconds(0);
BaiduMusicElement.Play();
});
}
}
private string IsNumber(string str)
{//判断str的最后一个字符是否数字
int result;
string lastOne = str.Substring(7);
if (int.TryParse(lastOne, out result))
{
return str;
}
else
{
return str.Substring(0, 7);
}
}
}
}
至于为什么用StreamReader读取Stream后，再用xmlreader读取string就可以。。。。求牛人解答。
刚刚在做的时候发现，百度的API歌曲名和歌手名的首字母用大写和小写得到的XML居然不一样。。。。。。无语！
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