Need to have the server make a POST to an API, how do I add POST values to a WebRequest object and how do I send it and get the response (it will be a string) out?
I need to POST TWO values, and sometimes more, I see in these examples where it says string postData = "a string to post"; but how do I let the thing I am POSTing to know that there is multiple form values?
From MSDN
// Create a request using a URL that can receive a post.
WebRequest request = WebRequest.Create ("http://contoso.com/PostAccepter.aspx ");
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = "This is a test that posts this string to a Web server.";
byte[] byteArray = Encoding.UTF8.GetBytes (postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
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 ();
// Get the response.
WebResponse response = request.GetResponse ();
// Display the status.
Console.WriteLine (((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
Console.WriteLine (responseFromServer);
// Clean up the streams.
reader.Close ();
dataStream.Close ();
response.Close ();
Take into account that the information must be sent in the format key1=value1&key2=value2
Here's what works for me. I'm sure it can be improved, so feel free to make suggestions or edit to make it better.
const string WEBSERVICE_URL = "http://localhost/projectname/ServiceName.svc/ServiceMethod";
//This string is untested, but I think it's ok.
string jsonData = "{ \"key1\" : \"value1\", \"key2\":\"value2\" }";
try
{
var webRequest = System.Net.WebRequest.Create(WEBSERVICE_URL);
if (webRequest != null)
{
webRequest.Method = "POST";
webRequest.Timeout = 20000;
webRequest.ContentType = "application/json";
using (System.IO.Stream s = webRequest.GetRequestStream())
{
using (System.IO.StreamWriter sw = new System.IO.StreamWriter(s))
sw.Write(jsonData);
}
using (System.IO.Stream s = webRequest.GetResponse().GetResponseStream())
{
using (System.IO.StreamReader sr = new System.IO.StreamReader(s))
{
var jsonResponse = sr.ReadToEnd();
System.Diagnostics.Debug.WriteLine(String.Format("Response: {0}", jsonResponse));
}
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
Here's an example of posting to a web service using the HttpWebRequest and HttpWebResponse objects.
StringBuilder sb = new StringBuilder();
string query = "?q=" + latitude + "%2C" + longitude + "&format=xml&key=xxxxxxxxxxxxxxxxxxxxxxxx";
string weatherservice = "http://api.worldweatheronline.com/free/v1/marine.ashx" + query;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(weatherservice);
request.Referer = "http://www.yourdomain.com";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
Char[] readBuffer = new Char[256];
int count = reader.Read(readBuffer, 0, 256);
while (count > 0)
{
String output = new String(readBuffer, 0, count);
sb.Append(output);
count = reader.Read(readBuffer, 0, 256);
}
string xml = sb.ToString();
A more powerful and flexible example can be found here: C# File Upload with form fields, cookies and headers
Below is the code that read the data from the text file and sends it to the handler for processing and receive the response data from the handler and read it and store the data in the string builder class
//Get the data from text file that needs to be sent.
FileStream fileStream = new FileStream(#"G:\Papertest.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
byte[] buffer = new byte[fileStream.Length];
int count = fileStream.Read(buffer, 0, buffer.Length);
//This is a handler would recieve the data and process it and sends back response.
WebRequest myWebRequest = WebRequest.Create(#"http://localhost/Provider/ProcessorHandler.ashx");
myWebRequest.ContentLength = buffer.Length;
myWebRequest.ContentType = "application/octet-stream";
myWebRequest.Method = "POST";
// get the stream object that holds request stream.
Stream stream = myWebRequest.GetRequestStream();
stream.Write(buffer, 0, buffer.Length);
stream.Close();
//Sends a web request and wait for response.
try
{
WebResponse webResponse = myWebRequest.GetResponse();
//get Stream Data from the response
Stream respData = webResponse.GetResponseStream();
//read the response from stream.
StreamReader streamReader = new StreamReader(respData);
string name;
StringBuilder str = new StringBuilder();
while ((name = streamReader.ReadLine()) != null)
{
str.Append(name); // Add to stringbuider when response contains multple lines data
}
}
catch (Exception ex)
{
throw ex;
}
Related
I am trying to push data into gmail streak through its API in c#,
basically i am trying to create pipeline in streak through API but it gives 400 Bad Request error but I am passing all the data according to given in its website link :- https://streak.readme.io/reference#create-a-pipeline
Code -
try
{
CookieContainer myContainerpush = new CookieContainer();
HttpWebRequest requestpush = (HttpWebRequest)WebRequest.Create("https://www.streak.com/api/v1/pipelines/");
requestpush.Method = "POST";
requestpush.Credentials = new NetworkCredential("gh0b9shff5f77e310cea", "");
String encodedAllPipelines = System.Convert.ToBase64String(System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes("ee3deb0b9f7c4d6c92f5f5f77e310cea:"));
requestpush.Headers.Add("Authorization", "Basic " + encodedAllPipelines);
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// allows for validation of SSL conversations
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
requestpush.CookieContainer = myContainerpush;
requestpush.PreAuthenticate = true;
string postData = "{ name:'Hiring', teamWide: false,fieldNames: ['Test'],fieldTypes: ['TEXT_INPUT'],stageNames: ['SNOw'],teamkey: 'agxdsfsdfsdf9nYWVyEQsSBFRlYW0YgICI_fG-9QsM'}";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
requestpush.ContentType = "application/x-www-form-urlencoded";
requestpush.ContentLength = byteArray.Length;
//// Get the request stream.
Stream dataStream = requestpush.GetRequestStream();
//// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
//// Close the Stream object.
dataStream.Close();
// Get the response.
WebResponse response = requestpush.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
// The using block ensures the stream is automatically closed.
using (dataStream = response.GetResponseStream())
{
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
Console.WriteLine(responseFromServer);
}
// Close the response.
response.Close();
}
catch (Exception e)
{
e.Message.ToString();
}
I am trying set both request body data and FileStream in POST HTTP request. But only the file is being added in request body, the POST BODY PARAMETERS are not added
string fileUrl=#"E:\code.txt";
string url = "http://ptsv2.com/t/PostReq/post";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
string boundaryString = "------------"+DateTime.Now.Ticks.ToString("x");
// Set the http request header \\
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "multipart/form-data;boundary=" + boundaryString;
request.KeepAlive = true;
request.Credentials =CredentialCache.DefaultCredentials;
// Use a MemoryStream to form the post data request,
// so that we can get the content-length attribute.
MemoryStream postDataStream = new MemoryStream();
StreamWriter postDataWriter = new StreamWriter(postDataStream);
// Include the file in the post data
postDataWriter.Write("\r\n--" + boundaryString + "\r\n");
postDataWriter.Write("Content-Dis-data;"+ "name=\"{0}\";"+ "filename=\"{1}\""+"\r\nContent-Type: {2}\r\n\r\n",
"myFile",
Path.GetFileName(fileUrl),
Path.GetExtension(fileUrl));
postDataWriter.Flush();
// Read the file
FileStream fileStream = new FileStream(fileUrl, FileMode.Open, FileAccess.Read,FileShare.ReadWrite);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
postDataStream.Write(buffer, 0, bytesRead);
}
fileStream.Close();
postDataWriter.Write("\r\n--" + boundaryString + "--\r\n");
postDataWriter.Flush();
// Dump the post data from the memory stream to the request stream
using (Stream stream = request.GetRequestStream())
{
string data="username=hello&pwd=test123";
byte[] postData = Encoding.ASCII.GetBytes(data);
stream.write(postData,0,postData.Length);
postDataStream.WriteTo(stream);
}
postDataStream.Close();
WebResponse response = request.GetResponse();
StreamReader responseReader = new StreamReader(response.GetResponseStream());
string replyFromServer = responseReader.ReadToEnd();
MessageBox.Show(replyFromServer);
Every time I run the solution only the file is uploaded to server, not the post request body.
Can someone help me figure out this problem?
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!
I am trying to get cognos report using siteminder token, below is my code.
string cognosUrl = "https://cognos.blah.com";
string reportPath = "/c10/cgi-bin/cognosisapi.dll/rds/reportData/report/"; string reportId = "ildjfsldkf"; //prod
cognosUrl += string.Concat(reportPath, reportId,"?blahblah");
string targetUrl = cognosUrl;
string strFormvalues = string.Concat("TARGET=",targetUrl);
ASCIIEncoding encoder = new ASCIIEncoding();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(targetUrl);
byte[] data = encoder.GetBytes(strFormvalues);
request.AllowAutoRedirect = false;
request.Timeout = 120000;
request.ContentLength = data.Length;
request.ContentType = "text/xml;charset=\"utf-8\"";
request.Method = "POST";
request.Headers.Add(HttpRequestHeader.Cookie,"SMSESSION="+stoken);
request.GetRequestStream().Write(data, 0, data.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string json = reader.ReadToEnd();
byte[] byteArray = Encoding.UTF8.GetBytes(json);
MemoryStream restream = new MemoryStream(byteArray);
using (Stream output = File.OpenWrite(#"c:\\Projects\\Test_"+DateTime.Now.ToString("yyyyMMddHHmmssfff")+".txt"))
using (Stream input = restream)
{
if (input != null) input.CopyTo(output);
}
// var results = serializer.DeserializeObject(json);
reader.Close();
dataStream.Close();
response.Close();
But I am getting response as " DPR-ERR-2101 Your request was invalid.Please contact your administrator."
I am not using C# myself, but a few recommendations while debugging this:
If you are only posting a URL, why not use GET instead of POST?
Try paste the targetURL in your browser, see what happens.
In my setup, when I paste the URL in the browser, I am always redirected before I receive an answer. (to a URL like, /cgi-bin/cognosisapi.dll/rds/sessionOutput/conversationID/i292ED29A62474697AD44306A388F5BBB You are preventing that to happen, that might be an issue)
Hope that helps.
I've a CF 2.0 project where I need to implement something as below:
var myList = new List<MyItem>() { item1, item2 };
using (var webclient = new WebClient())
{
webclient.Headers["Content-type"] = "application/json";
webclient.Encoding = Encoding.UTF8;
var data = JsonConvert.SerializeObject(myList);
var response = webclient.UploadString("http://111.111.111.111:8762/MyService/FetchData", "POST", data);
var myItems = JsonConvert.DeserializeObject(response, typeof(List<MyItem>));
}
I Cannot find System.Net.WebClient in CF 2.0
The example on this page
is a good one for what I was looking for.
public void Test()
{
// Create a request using a URL that can receive a post.
WebRequest request = WebRequest.Create("http://www.contoso.com/PostAccepter.aspx ");
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = "This is a test that posts this string to a Web server.";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/json";
// Set the ContentLength property of the WebRequest.
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 ();
// Get the response.
WebResponse response = request.GetResponse ();
// Display the status.
Console.WriteLine (((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
Console.WriteLine (responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
}