C# and the API

[Trent McDougall]

Hello,

I cannot login and obtain a session id from c#. I am instead returned the string;

 {"status":"error","errormessage":"no json"}

I believe that my problem is in the headers. I have tried many strings for the content type including; 

x-www-form-encoded

application/x-www-form-encoded

application/json

public static string Login()

        {

            

            string url ="http://nova.astrometry.net/api/login";

            string result = "";

            using (var client = new WebClient())

            {

                client.Headers[HttpRequestHeader.ContentType] = "application/json.";

                result = client.UploadString(url, "POST", "%7B%22apikey%22%3A+%22lmxqdvfhopgfdpip%22%7D");

            }

            return result;

            

        }

I would be grateful for any help to get me over the line.

Kind Regards,

Trent 

[Trent McDougall]

I have found the solution in an earlier post, here is the successful code;

public static string Login()

        {

            

            string url ="http://nova.astrometry.net/api/login";

            string result = "";

            using (var client = new WebClient())

            {

                client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";

                result = client.UploadString(url, "POST", "request-json=%7B%22apikey%22%3A+%22XXXX%22%7D");

            }

           

            return result;

            

        }

[Trent McDougall]

Hi Guys,

I am now working on the next phase which is uploading a file. This is proving to be quite a challenge for me. I am using fiddler to monitor comms from a plate solving app. I would be open to hints/outright answers to get over the line,,, 

Trent

[Dustin Lang]

Hi,

Yes, file upload is likely to be a challenge.

Please note that I added significantly to the API documentation on the web,
http://astrometry.net/doc/net/api.html#submitting-a-file

I have one major hint: the formatting is EXACTLY the same as it would be for a regular HTML form containing a text field called "request-json" with the JSON properties for the upload, plus a file upload field.

You may also want to have a look at the python client, even if you don't speak python, because you can probably get it to do the minimal requests required.

cheers,
--dustin

[Kevin Sipprell]

Trent, 

I've just gone through this exercise...this is working for me...maybe it will help you....

please note:  I'm not a programmer just a hobbyist so there are likely some 'no-no's'  

 private async void PostFile(string session, string filename)

        {

            uploading = true;

            Log("Uploading Image");

            FileLog2("Uploading Image" + DateTime.Now);

            JsonObject obj = new JsonObject();

            JsonObject jsonObject = getUploadJson(session);

            String input = jsonObject.ToString();  // was &json-request...

            string baseAddress = "http://nova.astrometry.net/api/upload";

            using (var httpClient = new HttpClient())

            {

                httpClient.Timeout = TimeSpan.FromMinutes(3);

                using (var content = new MultipartFormDataContent("form-data"))

                {

                    try

                    {

                        //  var fileContent = new ByteArrayContent(File.ReadAllBytes(Path.GetFileName(MainWindow.solveImage)));

                        var fileContent = new ByteArrayContent(File.ReadAllBytes(GlobalVariables.SolveImage));

                        httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");

                        var stringContent = new StringContent(jsonObject.ToString());

                        stringContent.Headers.Add("Content-disposition", "form-data; name=\"request-json\"");

                        content.Add(stringContent, "text/plain");

                        string path2 = GlobalVariables.SolveImage; // for testing @"C:\Users\M81M82.fit";

                        FileStream fs = File.OpenRead(GlobalVariables.SolveImage);

                        var streamContent = new StreamContent(fs);

                        streamContent.Headers.Add("Content-type", "application/octet-strem");

                        streamContent.Headers.Add("Content-disposition", "form-data; name=\"file\"; filename=\"" + Path.GetFileName(path2) + "\"");

                        content.Add(streamContent, "file", Path.GetFileName(path2));

                      

                        using (var response = await httpClient.PostAsync(baseAddress, content))

                        {

                            string responseData = await response.Content.ReadAsStringAsync();

                            var serializer = new JavaScriptSerializer();

                            var result2 = serializer.Deserialize<Dictionary<string, string>>(responseData);  //e.g. http://procbits.com/2011/04/21/quick-json-serializationdeserialization-in-c

                            string sucess = result2["status"];

                            subid = result2["subid"];

                            string hash = result2["hash"];

                            Log("Upload Complete - submission id:   " + subid);

                            FileLog2("Upload Complete - submission id:   " + subid);

                        }

                    }

 catch (Exception e)

                    {

          

                              FileLog("Upload File error:   " + e.ToString());

                    }

                }

            }

        }

Regards, 

Kevin

[Kevin Sipprell]

Very helpful...Thank you!!!

Kevin

[Trent McDougall]

Thank you Kevin!

I am confused by this one line through;

  JsonObject jsonObject = getUploadJson(session);

Cheers,

Trent

[Kevin Sipprell]

whoops...

 internal static JsonObject getUploadJson(string session)

        {

            JsonObject obj = new JsonObject();

            obj["publicly_visible"] = "y";

            obj["allow_modifications"] = "d";

            obj["session"] = session;

            obj["allow_commercial_use"] = "d";

            return obj;

        }

Kevin

[Trent McDougall]

Thanks heaps!

[Sándor Kóra]

I'm using the great c # githb app successfully. Connecting to astrometry server, successfully uploading image to process. I have enclosed a source code snippet for you.

 private void button1_Click(object sender, EventArgs e)

        {

            filepath = "";

            filename = "";

            string dbkonyvtar = AtnezetgridFomenu.Rows[AtnezetgridFomenu.CurrentCell.RowIndex].Cells[1].Value.ToString();

            filepath = filepath + dbkonyvtar + "\\";

            string dbfilename = AtnezetgridFomenu.Rows[AtnezetgridFomenu.CurrentCell.RowIndex].Cells[2].Value.ToString();

            filename = dbfilename;

            string file = filepath + filename;

            try

            {

                //var client = new Client(AstrometryAPIkey, "http://127.0.0.1:8080/api/login");

                //--- astrometry.net kliens apikulcs

                var client = new Client(AstrometryAPIkey);                

                var res = client.Login();

                //--- autentikáció sikeres

                if (res.status.ToString().Equals("success") )

                {

                    var aclientsessionId = res.session;

                    FitsListBoxHDUS.Items.Add("\n Login Apikey : " + AstrometryAPIkey);

                    FitsListBoxHDUS.Items.Add("\n Login message : " + res.message);

                    FitsListBoxHDUS.Items.Add("\n Login session : " + res.session);

                    FitsListBoxHDUS.Items.Add("\n Login error message : " + res.errormessage);

                    FitsListBoxHDUS.Items.Add("\nLogin status : " + res.status);

                }

                //--- autentikáció sikertelen

                else

                {

                    FitsListBoxHDUS.Items.Add("\n Login error message : " + res.errormessage);

                }

                CancellationTokenSource tokenSource = new CancellationTokenSource();

                CancellationToken token = tokenSource.Token;                

                //--- feltöltéskor értékelési paraméterek beállítása

                var uploadArguments = new UploadArgs { publicly_visible = Visibility.n };

                // allow_commercial_use

                // allow_modifications

                // center_dec

                // downsample_factor

                // publicly_visible

                // radius

                // scale_err

                // scale_est

                // scale_lower

                // scale_type

                // scale_units

                // scale_upper

                // session

                //--- file feltöltés válasza

                var uploadResponse = client.Upload(file, uploadArguments);

                //--- feltöltés státusz

                var auploadstatus = uploadResponse.status;

                //--- sikeres képfeltöltés 

                if (uploadResponse.status.Equals("success"))

                {                    

                    var auploadhash = uploadResponse.hash;

                    var auploadsubid = uploadResponse.subid;

                }

                //--- feltöltés sikertelen

                else

                {

                    FitsListBoxHDUS.Items.Add("\n Upload error message : " + uploadResponse.errormessage);

                }

                var jobStatusResponse = client.GetJobStatus(uploadResponse.subid, token);

                var jobstr = client.GetJobStatus(jobStatusResponse.Id.ToString(), tokenSource.Token);

                Task <SubmissionStatusResponse> submissionStatusResponse = client.GetSubmissionStatus(uploadResponse.subid, token);                

                var jobsubstr = client.GetSubmissionStatus(token.ToString(),token);

                var gc = client.GetCalibration(jobstr.Id.ToString());

                var cliberror = gc.error;

                var caldec = gc.dec;

                var calibra = gc.ra;

....

Hope this help...

2016. március 28., hétfő 10:41:55 UTC+2 időpontban Trent McDougall a következőt írta:

Helló,

Nem tudok bejelentkezni és beszerezni a munkamenet azonosítóját a c # -ről. Ehelyett visszaadtam a húrot;

 {"status": "error", " errormessage": "no json"}

Úgy gondolom, hogy a problémám a fejlécekben van. Próbáltam sok szöveget a tartalom típusához, beleértve; 

X-www-form-kódolt

alkalmazás / x-www-formátum-kódolás

application / json

nyilvános statikus karakterlánc Bejelentkezés ()

        {

            

            string url = " http://nova.astrometry.net/ api / login ";

            string eredmény = "";

            használata (var kliens = új WebClient ())

            {

                client.Headers [HttpRequestHeader.ContentType ] = "application / json.";

                eredmény = kliens.UploadString (URL, "POST", "% 7B% 22apikey% 22% 3A +% 22lmxqdvfhopgfdpip% 22% 7D");

            }

            visszatérési eredmény;

            

        }

Hálás lennék minden segítségért, amiért átvittél a vonalon.

Üdvözlettel,

Trent