Make a web service request and read response from example cUrl

Question

User-235682625 posted

Hi,

I have an below example of cURL command, i want to make a similar webservice request using .NET Can someone please help me convert below curl to .NET request.

Thanks in advance.

curl -H 'X-API-TOKEN: yourapitoken' -H "Expects:" \
  -F 'surveyId=SV_012345678912345' \
  -F 'file=@example.csv;type=text/csv' \
  'https://yourdatacenterid.qualtrics.com/API/v3/responseimports'

Answer 1

User991499041 posted

Hi renu.paldiwal,

You'd use one of the following options:

HttpWebRequest/HttpWebResponse
WebClient
HttpClient (available from .NET 4.5 on)

I'd highly recommend using the HttpClient class, as it's engineered to be much better. You could also use HttpWebRequest/HttpWebResponse, check this answer.

using (var client = new HttpClient())
{
	var url = "https://xxx";
	client.DefaultRequestHeaders.Add("name", "value");
	...
	var response =  client.GetStringAsync(url);
    
}

Regards,

zxj

Answer 2

User1967761114 posted

Hi renu.paldiwal,

According to your description, you could refer to the following code.

var request = System.Net.HttpWebRequest.Create("https://yourdatacenterid.qualtrics.com/API/v3/responseimports");
request.Headers.Add("X-API-TOKEN", "yourapitoken");
request.Headers.Add("Expects");
request.Method = "POST";
var boundary = DateTime.Now.Ticks.ToString("x");
request.ContentType = "multipart/form-data; boundary=" + boundary;
var filePath = "D:\\1.txt";
Stream requestStream = request.GetRequestStream();
if (System.IO.File.Exists(filePath))
{
    boundary = "--" + boundary;
    //surveyId
    string data = boundary + "\r\nContent-Dis-data; name=\"surveyId\";\r\n\r\nSV_012345678912345\r\n";
    byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(data);
    requestStream.Write(formitembytes, 0, formitembytes.Length);
    //file
    data = boundary + "\r\nContent-Dis-data; name=\"file\";filename=\"" + Path.GetFileName(filePath) + "\"\r\nContent-Type:application/octet-stream\r\n\r\n";
    formitembytes = System.Text.Encoding.UTF8.GetBytes(data);
    requestStream.Write(formitembytes, 0, formitembytes.Length);
    using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
    {
        byte[] buffer = new byte[1024];
        int bytesRead = 0;
        while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
        {
            requestStream.Write(buffer, 0, bytesRead);
        }
        fileStream.Close();
    }
    //end
    formitembytes = System.Text.Encoding.UTF8.GetBytes("\r\n" + boundary + "--");
    requestStream.Write(formitembytes, 0, formitembytes.Length);
}
request.ContentLength = requestStream.Length;
requestStream.Close();
//get response
var reponse = request.GetResponse();

 

If you have any other questions, please feel free to contact me any time.

Best Regards

Even

Answer 3

User-235682625 posted

Even,

first of all thank you for the detailed code, I tried to implement this but i am still getting operation timeout error; Please see below the code I implemented.

 var request = System.Net.HttpWebRequest.Create("https://yourdatacenterid.qualtrics.com/API/v3/responseimports");
            request.Headers.Add("X-API-TOKEN: xxxxxxxxxxxxxx");
            //request.Headers.Add("Expects");
            request.Method = "POST";
            var boundary = DateTime.Now.Ticks.ToString("x");
            request.ContentType = "multipart/form-data; boundary=" + boundary;
            var filePath = "C:\\test.csv";
            Stream requestStream = request.GetRequestStream();
            if (System.IO.File.Exists(filePath))
            {
                boundary = "--" + boundary;
                //surveyId
                string data = boundary + "\r\nContent-Dis-data; name=\"surveyId\";\r\n\r\nSV_ePswPpv4rPD77fL5\r\n";
                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(data);
                requestStream.Write(formitembytes, 0, formitembytes.Length);
                //file
                data = boundary + "\r\nContent-Dis-data; name=\"file\";filename=\"" + Path.GetFileName(filePath) + "\"\r\nContent-Type:application/octet-stream\r\n\r\n";
                formitembytes = System.Text.Encoding.UTF8.GetBytes(data);
                requestStream.Write(formitembytes, 0, formitembytes.Length);
                using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    byte[] buffer = new byte[1024];
                    int bytesRead = 0;
                    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        requestStream.Write(buffer, 0, bytesRead);
                    }
                    fileStream.Close();
                }
                //end
                formitembytes = System.Text.Encoding.UTF8.GetBytes("\r\n" + boundary + "--");
                requestStream.Write(formitembytes, 0, formitembytes.Length);
            }
            //request.ContentLength = requestStream.Length;
            requestStream.Close();
            //get response
            var reponse = request.GetResponse();

I also got a Node.JS script for the same which is working fine , i have attached the screenshot of Node.js script is there a way we can convert this Node.js script to C#.

var request = require('request');
var fs = require('fs');
var url = "https://yourdatacenterid.qualtrics.com/API/v3/responseimports";
var surveyId = "SV_ePswPpv4rPD77fL";
var token="XXXYourTokeXX";
var formdata={
	surveyId:surveyId,
	file: fs.createReadStream("test.csv")
};

var options={
	header:{
		'content-type':'multipart/form-data',
		'X-API-TOKEN':token
	},
	method:"POST",
	url:url,
	formdata: formdata
};

request(options,function(error,response,body){
	if(error)
	{
		
		console.log("Error" +error)
	}
	else{
		console.log(response.body);
	}
		
}

Answer 4

User1967761114 posted

Hi renu.paldiwal,

I rewrite my code, and I test succeeds this time, see the following code:

public string HttpPostData(string url, string fileKeyName, string filePath, NameValueCollection stringDict)
{
    var memStream = new MemoryStream();
    var webRequest = (HttpWebRequest)WebRequest.Create(url);
    var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
    var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "\r\n");
    var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
    var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");
    webRequest.Method = "POST";
    webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
    const string filePartHeader =
        "Content-Dis-data; name=\"{0}\"; filename=\"{1}\"\r\n" +
         "Content-Type: application/octet-stream\r\n\r\n";
    var header = string.Format(filePartHeader, fileKeyName, filePath);
    var headerbytes = Encoding.UTF8.GetBytes(header);
    memStream.Write(beginBoundary, 0, beginBoundary.Length);
    memStream.Write(headerbytes, 0, headerbytes.Length);
    var buffer = new byte[1024];
    int bytesRead;
    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
    {
        memStream.Write(buffer, 0, bytesRead);
    }
    var stringKeyHeader = "\r\n--" + boundary +
                           "\r\nContent-Dis-data; name=\"{0}\"" +
                           "\r\n\r\n{1}\r\n";
    foreach (byte[] formitembytes in from string key in stringDict.Keys
                                     select string.Format(stringKeyHeader, key, stringDict[key])
                                         into formitem
                                     select Encoding.UTF8.GetBytes(formitem))
    {
        memStream.Write(formitembytes, 0, formitembytes.Length);
    }
    memStream.Write(endBoundary, 0, endBoundary.Length);
    webRequest.ContentLength = memStream.Length;
    var requestStream = webRequest.GetRequestStream();
    memStream.Position = 0;
    var tempBuffer = new byte[memStream.Length];
    memStream.Read(tempBuffer, 0, tempBuffer.Length);
    memStream.Close();
    requestStream.Write(tempBuffer, 0, tempBuffer.Length);
    requestStream.Close();
    string responseContent;
    var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
    using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(),
                                                    Encoding.GetEncoding("utf-8")))
    {
        responseContent = httpStreamReader.ReadToEnd();
    }
    fileStream.Close();
    httpWebResponse.Close();
    webRequest.Abort();
    return responseContent;
}

You could invoke it such like the following code:

var datas = new NameValueCollection();
datas.Add("surveyId", "nSV_ePswPpv4rPD77fL5");
HttpPostData("https://yourdatacenterid.qualtrics.com/API/v3/responseimports", "file", "C:\\test.csv", datas);

 

If you have any other questions, please feel free to contact me any time.

Best Regards

Even

Answer 5

User-235682625 posted

this is not working and does not have an API token, I am getting the same error, I tried to do the same call using Node.JS script below and It works perfectly fine, I believe we need to convert the below Node.JS script to c# .

var request = require('request');
var fs = require('fs');
var url = "https://yoururl/API/v3/responseimports";
var surveyId = "SV_ePswPpv4rPD77fL";
var token="AXXXXXXXXXXXXXZZZZ";
var formData={
	surveyId:surveyId,
	file: fs.createReadStream("test.csv")
};

var options = {
	headers:{
		'content-type':'multipart/form-data',
		'X-API-TOKEN':token
	},
	method:"POST",
	url:url,
	formData: formData
};

request(options, function(error,response,body){
	if(error){
		console.log("Error" +error);
	}
	else{
		console.log(response.body);
		console.log("webservice call completed");
		console.log(response.statusCode);

	}
		
});

Answer 6

User991499041 posted

Hi Renu,

You can check below Full HTTP POST/WebRequest Example (C#) and CSV file.

class Program
{
static void Main(string[] args)
{
string URLAuth = "***urlauth***";
WebClient webClient = new WebClient();

NameValueCollection formData = new NameValueCollection();
formData["Username"] = "myUser";
formData["Password"] = "myPassword";

byte[] responseBytes = webClient.UploadValues(URLAuth, "POST", formData);
string resultAuthTicket = Encoding.UTF8.GetString(responseBytes);
webClient.Dispose();

string URL = "***url***";
string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
System.Net.WebRequest webRequest = System.Net.WebRequest.Create(URL);

webRequest.Method = "POST";
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;

string FilePath = "C:\\test.csv";
formData.Clear();
formData["ticket"] = resultAuthTicket;
formData["ReplaceAll"] = "false";

Stream postDataStream = GetPostStream(FilePath, formData, boundary);

webRequest.ContentLength = postDataStream.Length;
Stream reqStream = webRequest.GetRequestStream();

postDataStream.Position = 0;

byte[] buffer = new byte[1024];
int bytesRead = 0;

while ((bytesRead = postDataStream.Read(buffer, 0, buffer.Length)) != 0)
{
reqStream.Write(buffer, 0, bytesRead);
}

postDataStream.Close();
reqStream.Close();

StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream());
string Result = sr.ReadToEnd();
}

private static Stream GetPostStream(string filePath, NameValueCollection formData, string boundary)
{
Stream postDataStream = new System.IO.MemoryStream();

//adding form data
string formDataHeaderTemplate = Environment.NewLine + "--" + boundary + Environment.NewLine +
"Content-Dis-data; name=\"{0}\";" + Environment.NewLine + Environment .NewLine + "{1}";

foreach (string key in formData.Keys)
{
byte[] formItemBytes = System.Text.Encoding.UTF8.GetBytes(string.Format(formDataHeaderTemplate,
key, formData[key]));
postDataStream.Write(formItemBytes, 0, formItemBytes.Length);
}

//adding file data
FileInfo fileInfo = new FileInfo(filePath);

string fileHeaderTemplate = Environment.NewLine + "--" + boundary + Environment.NewLine +
"Content-Dis-data; name=\"{0}\"; filename=\"{1}\"" +
Environment.NewLine + "Content-Type: application/vnd.ms-excel" + Environment.NewLine + Environment.NewLine;

byte[] fileHeaderBytes = System.Text.Encoding.UTF8.GetBytes(string.Format(fileHeaderTemplate,
"UploadCSVFile", fileInfo.FullName));

postDataStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);

FileStream fileStream = fileInfo.OpenRead();

byte[] buffer = new byte[1024];

int bytesRead = 0;

while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
postDataStream.Write(buffer, 0, bytesRead);
}

fileStream.Close();

byte[] endBoundaryBytes = System.Text.Encoding.UTF8.GetBytes("--" + boundary + "--");
postDataStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);

return postDataStream;
}
}

Regards,

zxj