语音播报实时天气 的实现

.Net里面自带了一个语音类库：System.Speech，调用系统的语音功能，就能实现string到语音的转换，很简单（记得先把电脑音量调大一下）：

// Add System.Speech reference first
using System.Speech.Synthesis;

var reader = new SpeechSynthesizer();
reader.SpeakAsync( " I'm a programer. Hello, world! ");

Hello, world! 你听到了……这里我用了SpeakAsync方法，也就是异步执行，不会阻塞主线程。你也可以直接调用Speak()方法，也就是在一个线程里面——突然想到可以利用Speak()方法来调试程序，把断点或者Log换成Speak()： 当别人辛苦的翻阅数百行的日志--而你的电脑用悠扬的语音告诉你：“This user's entity is null, here is a bug!”，高端大气上档次呀！

二、 获取本地实时天气

园子里面有很多获取天气的API文章，这里就不介绍了，给一个CSDN链接，还算比较全：天气预报API接口大全

我这里用的都是新浪的API，最简单快捷。获取本地的实时天气，分为两步：一、根据电脑公网IP 获取当前城市；二、根据城市获取天气信息。

var webClient = new WebClient() { Encoding = Encoding.UTF8 };
// Get location city
var location = webClient.DownloadString( " http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json ");
var json = new JavaScriptSerializer().Deserialize<dynamic>(location);
// Read city from utf-8 format
var city = HttpUtility.UrlDecode(json[ " city "]);

获取到的地理信息是json格式，反序列成dynamic动态类型，不需要再去创建个类去和json数据对应，C#获取json数据就和javascript中的操作差不多了，用了当然这样也就肯定没有VS的智能感知。取到的省市信息都是UTF-8编码的，所以要取出来的话，进行Decode。

// Get weather data(xml format)
string weather = webClient.DownloadString( string.Format(
" http://php.weather.sina.com.cn/xml.php?city={0}&password=DJOYnieT8234jlsK&day=0 ",
HttpUtility.UrlEncode(json[ " city "], Encoding.GetEncoding( " GB2312 "))));
// Console.WriteLine(weather);
var xml = new XmlDocument();
xml.LoadXml(weather);

这次取到的天气信息就是XML格式的了，也很方便。但需要注意的是此，构建URL的时候要把城市采用GB2312格式编码，WebClient需要指定UTF-8格式。天气信息取到了，下面就是编字符串，让它说话了，这里附上全部的代码，总共23行：

1 // Initialize Speaker
2 var reader = new SpeechSynthesizer();
3 reader.Speak( " I'm a programer,Hello, World! ");
4
5 var webClient = new WebClient() { Encoding = Encoding.UTF8 };
6 // Get location city
7 var location = webClient.DownloadString( " http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json ");
8 var json = new JavaScriptSerializer().Deserialize<dynamic>(location);
9 // Read city from utf-8 format
10 var city = HttpUtility.UrlDecode(json[ " city "]);
11 // Get weather data(xml format)
12 string weather = webClient.DownloadString( string.Format(
13 " http://php.weather.sina.com.cn/xml.php?city={0}&password=DJOYnieT8234jlsK&day=0 ",
14 HttpUtility.UrlEncode(json[ " city "], Encoding.GetEncoding( " GB2312 "))));
15 // Console.WriteLine(weather);
16 var xml = new XmlDocument();
17 xml.LoadXml(weather);
18 // Get weather detail
19 var root = xml.SelectSingleNode( " /Profiles/Weather ");
20 var detail = root[ " status1 "].InnerText + " ， " + root[ " direction1 "].InnerText
21 + root[ " power1 "].InnerText.Replace( " - ", " 到 ") + " 级， "
22 + root[ " gm_s "].InnerText + root[ " yd_s "].InnerText;
23 reader.SpeakAsync( " 今天是 " + DateTime.Now.ToShortDateString() + " ， " + city + " " + detail);