Develop Reference

WindowsPhone HttpWebRequest to ashx WebService

I have a problem with HttpWebRequest:
I have an ashx code in a visual studio ws that simply does:
public void ProcessRequest(HttpContext context)
{
var a = context.Request.Form["a"];
var b = context.Request.Form["b"];
context.Response.Write(a + " " + b);
}
I tried to call it with advancedRestClient and it worked, but if i call it with my windows phone device I get a not found exception and the request doesn't reach any breakpoint.
this is my WP code:
public void PostIt2()
{
string url = "http://localhost/blablacode/ecc.ashx";
// Create a new HttpWebRequest object.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
// Set the Method property to 'POST' to post data to the URI.
request.Method = "POST";
// start the asynchronous operation
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);
// Keep the main thread from continuing while the asynchronous
// operation completes. A real world application
// could do something useful such as updating its user interface.
allDone.WaitOne();
}
private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string postData = "{'a': 'avar','b':'bvar'}";
// Convert the string into a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Write to the request stream.
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
// Start the asynchronous operation to get the response
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
private static void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
Console.WriteLine(responseString);
// Close the stream object
streamResponse.Close();
streamRead.Close();
// Release the HttpWebResponse
response.Close();
allDone.Set();
}
I took the code from MSDN so i don't know what i'm doing wrong, i also tried a lot of methods found on the internet, the only thing important for me is that i have to use HttpWebRequest and not HttpClient.
Can someone help me please?

Its possible that the problem is not in the code.
Are your services accesible from the phone??
Are your proyect configure with internet access??
If all its ok, look at this post:
httpclient postasync windows phone 8.1 universal app second call 404 error

Ok, really thanks god is friday.
i was using as url "localhost/eccecc.ashx"
device's localhost is not same localhost of computer.

rest api is not giving desired results

I am not getting the results that documentation says. I login the Buddy; created application; copy this URL and assign to url string; when I execute the program I am not getting results that are expected (status + Accesstoken) as documentation says. Can anyone please tell me if I am missing something as newbie to http calls. Its running on http requester but not on Poster firefox add-on!
Documentation
http://dev.buddyplatform.com/Home/Docs/Getting%20Started%20-%20REST/HTTP?
Code
string parameters = "{appid:'xxxxxx', appkey: 'xxxxxxx', platform: 'REST Client'}";
private async void SimpleRequest()
{
HttpWebRequest request = null;
HttpWebResponse response = null;
try
{
request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "application/json";
request.ContentType = "application/json";
request.Method = "POST";
StreamWriter sw = new StreamWriter(await request.GetRequestStreamAsync());
sw.WriteLine(parameters);
sw.Close();
response = (HttpWebResponse) await request.GetResponseAsync();
}
catch (Exception)
{ }
}

Using the HTTP requester add-on on Firefox, I successfully retrieved an access token so their API work.
In C# they provide a line of code to submit your appid and appkey, that might be the problem :
Buddy.Init("yourAppId", "yourAppKey");
My guess is you have to use their .NET SDK!

You can certainly use the REST API from raw REST the way you're doing, though the .NET SDK will handle some of the more complex details of changing service root. I ran your code using my own Buddy credentials and I was able to get JSON containing an Access Token back. You may need to read the response stream back as JSON to retrieve the access token. I used the following code to dump the JSON to the console:
request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "application/json";
request.ContentType = "application/json";
request.Method = "POST";
StreamWriter sw = new StreamWriter(await request.GetRequestStreamAsync());
sw.WriteLine(parameters);
sw.Close();
response = (HttpWebResponse)await request.GetResponseAsync();
Console.WriteLine(await new StreamReader(response.GetResponseStream()).ReadToEndAsync());
Using Newtonsoft.Json I can parse out my accessToken like this:
Uri url = new Uri("https://api.buddyplatform.com/devices");
request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "application/json";
request.ContentType = "application/json";
request.Method = "POST";
StreamWriter sw = new StreamWriter(await request.GetRequestStreamAsync());
sw.WriteLine(parameters);
sw.Close();
response = (HttpWebResponse)await request.GetResponseAsync();
var parsed = JsonConvert.DeserializeObject<IDictionary<string,object>>( (await new StreamReader(response.GetResponseStream()).ReadToEndAsync()));
var accessToken = (parsed["result"] as JObject).GetValue("accessToken").ToString();
Console.WriteLine(accessToken);
The 3.0 SDK does all of this for you while exposing the rest of the service through a thin REST wrapper, the migration guide for the 3.0 SDK should help with this.

Flow of execution in Httpwebrequest POST in Windows hone 8

If I have this code in Windows Phone 8, for instance
string __retS = null;
private String postRequest(String url, String postData)
{
byte[]byteData = Encoding.UTF8.GetBytes(postData);
HttpWebRequest request = null;
try
{
Uri uri = new Uri(url);
request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteData.Length;
// start the asynchronous operation
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);
} // end try
catch (Exception)
{
}
return __retS;
}
I put a breakpoint on this line request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);. I expected that execution will jump to my GetRequestStreamCallback method but it doesn't. It rather goes on to execute the return statement hence a null value is always returned.
Is that how its supposed to go?

Is that how its supposed to go?
Yes. When the work is done it will invoke the callback function you passed. See "Asynchronous Programming Model (APM)". Starting with .Net 4.5 / c# 5.0, you can use async/await which can help to write async codes simpler.
var stream = await request.GetRequestStreamAsync();
//...do some work using that stream

The callback is executed asynchronously, that means the code is continued after the asynchronous method is assigned. (request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);)
When the WebRequest is finished, the GetRequestStreamCallback is executed.
Because the UI thread would be blocked if this request was synchronous the windows phone sdk only serves an asynchronous one.

C# API POST Request

I'm trying to post to an API using C#.
Here is some documentation on the API: http://docs.gurock.com/testrail-api/accessing
Here is what I have so far:
string url = "https://example.testrail.com//index.php?/miniapi/add_result/1&key=19e73cdd99fbad172d3523b13d1c8c8f";
HttpWebRequest req = WebRequest.Create(new Uri(url))as HttpWebRequest;
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
My question is how can I pass in a Status_id of 1 and a comment of "Test" and then post to the API?

You need to call the GetRequestStream method on your req object, and write the post parameters to that

Blocking asynchronous operation in Windows phone

I am trying send the http post from the windows phone to the server and I am getting some of problem via sending the post data.I put the break point in button_click_1 function and I found that it would not start the asynronous operation. Beside that, it also block the current thread and I know that this situation is cause by the allDone.waitOne().
Why the asynronous operation will not function and how to solve it?
Thank you for any help.
private void Button_Click_1(object sender, RoutedEventArgs e)
{
// Create a new HttpWebRequest object.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
request.Method = "POST";
// start the asynchronous operation
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);
allDone.WaitOne();
}
Asynronous operation:
private void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string postData = "xxxxxxxxxxx";
// Convert the string into a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Write to the request stream.
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
// Start the asynchronous operation to get the response
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
private void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
tbtesting.Text = responseString.ToString();
streamResponse.Close();
streamRead.Close();
response.Close();
allDone.Set();
}

You're not the first to hit this (see Is it possible to make synchronous network call on ui thread in wpf (windows phone)). If you do this then you deadlock the UI thread on Windows Phone.
The closest you're going to get is to use the async/await on your network calls. There are extension methods you can use to do this as part of the Microsoft.Bcl.Async package on NuGet.