002转载----C# 基于OneNet 的物联网数据通信 001_C#我的第一个串口上位机软件

作者：lnwin521 
来源：CSDN 
原文：https://blog.csdn.net/lnwin521/article/details/84549606 
（遇到404情况请复制粘贴后再打开）
版权声明：本文为博主原创文章，转载请附上博文链接！

首先非常感谢这位大佬的文章，对于连接onenet很有用。

C# 基于OneNet 的物联网数据通信

本篇简介包含两部分：1、数据向OneNet平台的上传；2、数据从OneNet平台的下载。

1、数据向OneNet平台的上传

1.1 上传数据采用POST方式：

 1  public void Post()
 2         {
 3             pictureBox1.BackColor = Color.Gray;
 4             string url = "http://api.heclouds.com/devices/503683965/datapoints?";
 5             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
 6             request.Method = "POST";
 7             SetHeaderValue(request.Headers, "api-key", "dTOsflbiN1YGgUjIgNYjY3TBigw=");//设备API地址和 首部参数
 8             request.Host = "api.heclouds.com";
 9             request.ProtocolVersion = new Version(1, 1);
10             string Cod = "{"datastreams":[{"id":"temperature","datapoints":[{"value":"" + textBox4.Text + ""}]},{"id":"RH","datapoints":[{"value":"" + textBox5.Text + ""}]},{"id":"state","datapoints":[{"value":"" + textBox3.Text + ""}]}]}";
11             byte[] data = Encoding.UTF8.GetBytes(Cod);
12             request.ContentLength = data.Length;
13             using (Stream reqStream = request.GetRequestStream())
14             {
15                 reqStream.Write(data, 0, data.Length);
16                 reqStream.Close();
17             }
18 
19             HttpWebResponse resp = (HttpWebResponse)request.GetResponse();
20             Stream stream = resp.GetResponseStream();
21             //获取响应内容 
22             using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
23             {
24                 textBox6.Text = reader.ReadToEnd();
25                 pictureBox1.BackColor = Color.Lime;
26             }
27             // return result;
28         }//面向OneNet的发送

1.2 HTTP协议报文头编辑函数

 1  public static void SetHeaderValue(WebHeaderCollection header, string name, string value)// HTTP协议报文头加入
 2 
 3         {
 4             var property = typeof(WebHeaderCollection).GetProperty("InnerCollection", BindingFlags.Instance | BindingFlags.NonPublic);
 5             if (property != null)
 6             {
 7                 var collection = property.GetValue(header, null) as NameValueCollection;
 8                 collection[name] = value;
 9             }
10         }

2、数据从OneNet平台的下载

2.1 数据获取采用Get模式

 1  private void Get(object sender, EventArgs e)//连接服务器并获取数据
 2         {
 3             
 4             string url = "http://api.heclouds.com/devices/503683965/datapoints?";//设备地址
 5             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
 6             request.Method = "GET";
 7             SetHeaderValue(request.Headers, "api-key", "dTOsflbiN1YGgUjIgNYjY3TBigw=");//设备API地址和 首部参数
 8             request.Host = "api.heclouds.com";
 9             request.ProtocolVersion = new Version(1, 1);
10             request.ContentType = "text/html;charset=UTF-8";
11             HttpWebResponse response = (HttpWebResponse)request.GetResponse();
12             Stream myResponseStream = response.GetResponseStream();
13             StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
14             string retString = myStreamReader.ReadToEnd();
15             myStreamReader.Close();
16             myResponseStream.Close();
17             textBox5.Text = retString;
18            
19 
20         }

2.2 HTTP协议报文头编辑

 1  public static void SetHeaderValue(WebHeaderCollection header, string name, string value)// HTTP协议报文头加入
 2 
 3         {
 4             var property = typeof(WebHeaderCollection).GetProperty("InnerCollection", BindingFlags.Instance | BindingFlags.NonPublic);
 5             if (property != null)
 6             {
 7                 var collection = property.GetValue(header, null) as NameValueCollection;
 8                 collection[name] = value;
 9             }
10         }