【.Net MF网络开发板研究-03】获取雅虎天气
在上篇文章介绍了Http Server，通过PC上的IE浏览器（相当于Http client）来访问开发板上的Http服务。这次我们在网络开发板上实现Http Client，获取雅虎网站的天气信息，并把这些信息在LCD上显示出来。
包含两部分的代码，一是通过Http协议获取数据，二是对获取的网页，进行XML解析，以期获取天气信息。
主程序很简单，就是web服务请求和画面显示。
public static void Main()
{
try
{
weather = new yahooWeatherRequest();
weather.webRequest();
}
catch
{
Debug.Print("Error!");
}
WindowsDrawing win = new WindowsDrawing();
win.Width = SystemMetrics.ScreenWidth;
win.Height = SystemMetrics.ScreenHeight;
new Program().Run(win);
}
创建Http请求，并获取数据，相关代码如下：
private byte[] getHttpData(string url)
{
HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
request.HttpsAuthentCerts = null;
request.KeepAlive = true;
WebResponse resp = null;
Stream respStream = null;
byte[] bytData = null;
try
{
resp = request.GetResponse();
}
catch (Exception e)
{
Debug.Print("Exception in HttpWebRequest.GetResponse(): " + e.Message.ToString());
return null;
}
if (resp != null)
{
respStream = resp.GetResponseStream();
int bytesRead = 0;
int totalBytes = 0;
respStream.ReadTimeout = 5000;
Debug.Print("resp length= " + resp.ContentLength.ToString());
if (resp.ContentLength!=-1)
{
bytData = new byte[resp.ContentLength];
while (totalBytes < bytData.Length)
{
bytesRead = respStream.Read(bytData, totalBytes, bytData.Length - totalBytes);
if (bytesRead == 0)
{
Debug.Print("Error: Received " + totalBytes.ToString() + " Out of " + bytData.Length.ToString());
bytData = null;
break;
}
totalBytes += bytesRead;
Debug.Print("Bytes Read Now 0: " + bytesRead + " Total: " + totalBytes);
}
补充：Web开发 , ASP.Net ,
