Develop Reference

c# How to send HTTP command as this - http://192.168.10.1/api/control?alert=101002

I have this hardware from Patlite,
This hardware has an HTTP command control function, for example, if I copy the url "http://192.168.10.1/api/control?alert=101002" to chrome in my computer, it will activate the hardware as needed.
I want to send the command from my code.
I tried this code with no luck:
System.Net.ServicePointManager.Expect100Continue = false;
WebRequest request = WebRequest.Create("http://10.0.22.222/api/control");
request.Method = "post";
request.ContentType = "application/x-www-form-urlencoded";
string postData = "alert=101002";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = request.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close();
WebResponse response = request.GetResponse();
There is a picture from the manual:
Thanks

You need to create a webrequest instance for this.
WebRequest request = WebRequest.Create("http://192.168.10.1/api/control?alert=101002");
WebResponse response = request.GetResponse();
You may need to set some properties as request method and credentials for this to work.
See this:
https://msdn.microsoft.com/en-us/library/456dfw4f(v=vs.100).aspx

public static string Get(string url, Encoding encoding)
{
try
{
var wc = new WebClient { Encoding = encoding };
var readStream = wc.OpenRead(url);
using (var sr = new StreamReader(readStream, encoding))
{
var result = sr.ReadToEnd();
return result;
}
}
catch (Exception e)
{
//throw e;
return e.Message;
}
}
like this code use the url "http://192.168.10.1/api/control?alert=101002" to send get request.Good luck!

How can i get cookies in web request using c#?

I'm new to c# language. I want to write this code to post data to web url:
byte[] data = Encoding.ASCII.GetBytes($"Identifier={"anyUsername"}&Password={"Password"}");
WebRequest request = WebRequest.Create("http://users.tclnet.ir/Authentication/LogOn");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (Stream stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
string responseContent = null;
using (WebResponse response = request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader sr99 = new StreamReader(stream))
{
responseContent = sr99.ReadToEnd();
}
}
}
but i want get cookies from that answer,how can i write code to achieve it?

Stream does not support reading when placing a HTTP Post request

I am facing an error that is "Stream does not support reading". I am placing a Http post request to the url. Below is my code that what i am using
var request = (HttpWebRequest) WebRequest.Create("https://test.com/Hotel Hospitality Source?method=fetchInfo");
var postData = "&username=testing";
postData += "&password=Testing";
postData += "&hotelId=h075-103";
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using(var ms = new MemoryStream())
request.GetRequestStream().CopyTo(ms);
var response = (HttpWebResponse) request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
Firstly I have used below code.
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
I am getting error when I am using CopyTo method for stream. How can I resolve this error?

What is using (var ms=new MemoryStream()) request.GetRequestStream().CopyTo(ms); supposed to do? You're trying to copy the request stream (which is write-only) into a new memorystream that you then dispose.
You need to write into the request stream:
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}

Windows Phone 8.1 and HTTP POST Request

I'm trying to post data to a web server with such code:
HttpWebRequest request = WebRequest.Create(uri) as HttpWebRequest;
//request.CookieContainer = new CookieContainer();
//request.CookieContainer.Add(new Uri(uri), new Cookie());
string postData = parameters.ToQueryString();
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
try
{
using (Stream dataStream = await request.GetRequestStreamAsync())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
WebResponse response = await request.GetResponseAsync();
using (Stream dataStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(dataStream);
return await reader.ReadToEndAsync();
}
}
catch (Exception e)
{
return e.Message + e.StackTrace;
}
Those bits of information that I found on the Internet suggest that it's because response headers are incorrect, but it's not for sure.
Could you please tell how to do http post request with parameters and if suggestion described above is correct, how to tell system.net not to check response headers?
This is how I'm calling this method:
Dictionary<string, string> par = new Dictionary<string, string>();
par.Add("station_id_from", "2218000");
par.Add("station_id_till", "2200001");
par.Add("train", "112Л");
par.Add("coach_num", "4");
par.Add("coach_class", "Б");
par.Add("coach_type_id", "3");
par.Add("date_dep", "1424531880");
par.Add("change_scheme", "0");
debugOutput.Text = await Requests.makeRequestAsync("http://booking.uz.gov.ua/purchase/coach", par);

Accessing XML RPC Interface

i have some servers with rtorrent. I want to get status information about these servers and delete torrents for that i want to use the XML rpc interface of rtorrent.
scgi_port = localhost:5000
https://github.com/rakshasa/rtorrent/wiki/RPC-Setup-XMLRPC
Now i rly need some help to get the information from the interface back to my programm.
i already have some code, but i always get an error when executing.
Additional information: The Connection with the remote server could not be established.
using System;
using System.Text;
using System.Net;
using System.IO;
namespace SimpleXmlRpcClient
{
class Program
{
static void Main(string[] args)
{
WebRequest request = WebRequest.Create("http://ip/RPC2");
request.Method = "POST";
string postData = #"<?xml version=""1.0""?>
<methodCall>
<methodName>system.listMethods
</methodCall>";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
reader.Close();
dataStream.Close();
response.Close();
Console.WriteLine("Press any key to continue ...");
Console.ReadKey();
}
}
}

i finally found the solution.
you still have parse the xml encoded response but now i finally get an response.
System.Net.ServicePointManager.Expect100Continue = false;
byte[] requestData = Encoding.ASCII.GetBytes("<?xml version=\"1.0\"?><methodCall><methodName>system.listMethods</methodName></methodCall>");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://ip/RPC2");
request.Method = "POST";
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729;)";
request.ContentType = "text/xml";
request.ContentLength = requestData.Length;
using (Stream requestStream = request.GetRequestStream())
requestStream.Write(requestData, 0, requestData.Length);
string result = null;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream, Encoding.ASCII))
result = reader.ReadToEnd();
}
}

Good ! ,the solution of Olias is correct.