My API was as follows:
[HttpPut("{id}")]
public async Task<ActionResult<HomeContextModel>> EditHomeContext(int id, string title, string context, string subcontext, IFormFile imageFile)
{
HomeContextModel homeContextModel = await _context.HomeContext.Include(x => x.Image).Include(x => x.Button).Include(x => x.Logo).ThenInclude(y => y.Image)
.FirstOrDefaultAsync(m => m.Context_Id == id);
//HomeContextModel homeContextModel = await GetHomeContextModel(id);
if (homeContextModel == null)
{
return BadRequest("Context Id cannot be null");
}
if (imageFile != null)
{
ImageModel imageModel = homeContextModel.Image;
if (imageModel != null)
{
string cloudDomain = "https://privacy-web.conveyor.cloud";
string uploadPath = _webHostEnvironment.WebRootPath + "\\Images\\";
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
string filePath = uploadPath + imageFile.FileName;
using (var fileStream = new FileStream(filePath, FileMode.Create))
{
await imageFile.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
using (var memoryStream = new MemoryStream())
{
await imageFile.CopyToAsync(memoryStream);
imageModel.Image_Byte = memoryStream.ToArray();
}
imageModel.ImagePath = cloudDomain + "/Images/" + imageFile.FileName;
imageModel.Modify_By = "CMS Admin";
imageModel.Modity_dt = DateTime.Now;
//_context.Update(imageModel);
}
}
homeContextModel.Title = title;
homeContextModel.Context = context;
homeContextModel.SubContext = subcontext;
_context.Entry(homeContextModel).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!HomeContextModelExists(homeContextModel.Context_Id))
{
return NotFound();
}
else
{
throw;
}
}
return Ok("Home Context Edit Successfully");
}
It's an API for the Content Management System (CMS) to change the content of the Homepage using a Flutter webpage that make put request onto this API.
Everything works fine. In the last few days, where I tested and tested again during the development. So before today, I've wrapped up them and submitted to the necessary place (It's a university FYP).
Until now it cause me this error when I was using this to prepare my presentation:
Error 400 failed to read the request form Unexpected end of stream ..."
After all the tested I tried:
Internet solutions
restore the database
repair Microsoft VS 2019 (As this issue was fixed before after I
updated my VS 2019 from 16.8. to the latest 16.11.7)
Use the ASP .NET file which didn't caused this issue before
Then I realized it may be because of I used another older ASP file to accessed the same database before. Does this really cause this matter?
If yes, then now how should I solved it, with the action I already done (listed as above)?
EDIT: Additional description to the situation
The above API I set breakpoint before, on the first line, using Swagger to test it.
It turns out that it didn't go into the API and straightaway return the error 400
REST API can have parameters in at least two ways:
As part of the URL-path
(i.e. /api/resource/parametervalue)
As a query argument
(i.e. /api/resource?parameter=value)
You are passing your parameters as a query instead of a path as indicated in your code. And that is why it is not executing your code and returning 400.
Related
I am able to programmatically log in to the PowerBI Client, gather my Workspaces as well as get a specific Report from a specific Workspace. I need to programmatically render that report to a .pdf or .xlsx file. Allegedly this is possible with the ExportToFileInGroup/ExportToFileInGroupAsync methods. I even created a very simple report without any parameters. I can embed this using the sample app from here. So that at least tells me that I have what I need setup in the backend. But it fails when I try to run the ExportToFileInGroupAsync method (errors below code.)
My Code is:
var accessToken = await tokenAcquisition.GetAccessTokenForUserAsync(new string[] {
PowerBiScopes.ReadReport,
PowerBiScopes.ReadDataset,
});
var userInfo = await graphServiceClient.Me.Request().GetAsync();
var userName = userInfo.Mail;
AuthDetails authDetails = new AuthDetails {
UserName = userName,
AccessToken = accessToken,
};
var credentials = new TokenCredentials($"{accessToken}", "Bearer");
PowerBIClient powerBIClient = new PowerBIClient(credentials);
var groups = await powerBIClient.Groups.GetGroupsAsync();
var theGroup = groups.Value
.Where(x => x.Name == "SWIFT Application Development")
.FirstOrDefault();
var groupReports = await powerBIClient.Reports.GetReportsAsync(theGroup.Id);
var theReport = groupReports.Value
.Where(x => x.Name == "No Param Test")
.FirstOrDefault();
var exportRequest = new ExportReportRequest {
Format = FileFormat.PDF,
};
string result = "";
try {
var response = await powerBIClient.Reports.ExportToFileInGroupAsync(theGroup.Id, theReport.Id, exportRequest);
result = response.ReportId.ToString();
} catch (Exception e) {
result = e.Message;
}
return result;
It gets to the line in the try block and then throws the following errors:
An error occurred while sending the request.
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host..
UPDATE
Relating to #AndreyNikolov question, here is our Embedded capacity:
After this was implemented, no change. Same exact error.
Turns out the issue was on our side, more specifically, security/firewall settings. Here is the exact quote from our networking guru.
"After some more investigation we determined that our firewall was causing this issue when it was terminating the SSL connection. We were able to add a bypass for the URL and it is now working as expected."
I've defined a class that wraps the HMS ML Kit in-device translator.
This class has two translator instances, with two different settings:
MLLocalTranslator translatorSend = new MLLocalTranslator();
MLLocalTranslator translatorReceive = new MLLocalTranslator();
MLTranslateSetting settingSend = new MLTranslateSetting();
MLTranslateSetting settingReceive = new MLTranslateSetting();
translatorSend translates request from a language (for example it) to English (en). translatorReceive translates the response of the request from en to it.
However, the prepare method only downloads the model for en_it translation and not the it_en model (if exists).
HMSTranslator(String languageCode) {
settingSend.sourceLangCode = languageCode;
settingSend.targetLangCode = "en";
settingReceive.sourceLangCode = "en";
settingReceive.targetLangCode = languageCode;
}
Future<bool> prepare() async {
if(settingSend.sourceLangCode != settingSend.targetLangCode) {
bool isSendPrepared = await translatorSend.prepareModel(setting: settingSend)
bool isReceivePrepared = await translatorReceive.prepareModel(setting: settingReceive);
isPrepared = isSendPrepared && isReceivePrepared;
}
else {
isPrepared = false;
}
return isPrepared;
}
The problem comes when I translate a string with translatorSend.
Future<String> translateString(String stringToTranslate) async {
if(settingSend.sourceLangCode != settingSend.targetLangCode) {
String result;
if (isPrepared) {
result = await translatorSend.asyncTranslate(sourceText: stringToTranslate);
}
else {
settingSend.sourceTextOnRemote = stringToTranslate;
result = await sendRemoteTranslator.asyncTranslate(setting: settingSend);
}
return result;
}
else {
return stringToTranslate;
}
}
This method should translate an it String to an en String. However, it seems to call the en_it model and fails the translation:
I/flutter (28228): TRANSLATOR: it to en
I/flutter (28228): TRANSLATOR: PREPARED
I/MLLocalTranslator(28228): translate sourceLanguage: en targetLanguage: it
WHAT: vestiti usati -> vestiti usati - WHERE applicazione -> applicazione
The translation of the response, from en to it works.
I've tested other languages and that happens also with fr.
Further testing showed that the process worked with es:
WHAT: ropa usada -> Used clothing - WHERE aplicación -> application
Pls check whether you are using the new version of the Flutter plug-in.
Language packs can be used in two-way. For example, en-it can be used for en to it or it to en.
The following are for your reference:
Modify based on the plugin Demo in the official website
The same instance is used for bidirectional translation by invoking multiple times.
//Entry function
_translationMake() async {
try {
await _prepareModel_run("it","en","vestiti usati");
await _prepareModel_run("en","it","application");
} on Exception catch (e) {
print(e.toString());
}
}
_prepareModel_run(String srcLang, String dstLang, String content) async {
setting.sourceLangCode = srcLang;
setting.targetLangCode = dstLang;
try {
final bool res = await translator.prepareModel(setting: setting);
if (res) {
final String s = await _localTranslate_run(content);
if (s != null) {
print("_prepareModel_run " + content + " translate to "+s);
}
}else {
print("_prepareModel_run res false");
}
} on Exception catch (e) {
print(e.toString());
}
}
Future<String> _localTranslate_run(String Content) async {
try {
final String s =
await translator.syncTranslate(sourceText: Content);
if (s != null) {
_stopLocalTranslate();
setState(() => _translateResult = s);
return s;
} else {
print("no Translation");
setState(() => _translateResult = "no translation");
return "no translation";
}
} on Exception catch (e) {
print(e.toString());
}
}
And the log print results are as follows:
_prepareModel_run vestiti usati translate to Used clothes
_prepareModel_run application translate to applicazione
We can use HMS ML kit to translate text into different languages. The following is the info. you can take reference for.
ML services can currently translate texts between 12 languages: Simplified Chinese, English, French, Arabic, Thai, Spanish, Turkish, Portuguese, Japanese, German, Italian, and Russian.
Step 1: Text is fetched from UI and provided to ML model
Step 2: Parameters are set before making API call to server
· Source language code
· Desired Language code
· String which needs to be translated.
Step 3: Once API data reaches the server ML Model translates the text into desired output
Step 4: Server returns the translated output to application.
Step 5: Application shows output to UI.
Precautions: The machine learning model is stored on cloud. An Internet call is made so its permission is required.
Below are the changes you have to do in order to run build and run the project
Open App.gradle file and add this line on top.
apply plugin: 'com.huawei.agconnect'
To use Text Translation service add this dependency to pro
mplementation 'com.huawei.hms:ml-computer-translate:1.0.3.300'
MLRemoteTranslateSetting object is being created which takes Source Language as setSourceLangCode() and Output Language as setTargetLangCode()
MLRemoteTranslator object is created by passing previously created MLRemoteTranslateSetting object to it.
You can create a Task where mlRemoteTranslator will have an async call by asyncTranslate() and we will provide user string as the input to this method.
This task will yield to 2 callbacks
addOnSuccessListener
addOnFailureListener
As the name suggests you can add your code in success listener and can add notification/Log in failure listener.
For Flutter:
First:
create MlTranslatorSettings object and instance in initState
Second:
set the settings to the translator, for example, initial language and final language of the translation, see below example.
In the properties, you can customize the type of map, controls, camera position, initial position, etc.
Here are also some detailed info. regarding how to use HMS ML kit with Flutter:
Link Hope it will be helpful to you.
Inspired by Akavache I am trying to create a solution that provides me with an IObservable<IArticle>. The method essentially first try to get all the articles that are present in the database, then it tries to fetch updated articles from the webservice and as it is getting the latest articles from webservice it tries to save them back to the database.
Since the webservice is essentially a cold observable and I don't want to subscribe twice, I used Publish to connect to it. My understanding is that I am using the correct version of the Publish method, however, many times the method tend to miss first couple of Articles from the GetNewsArticles. This was observed through the UI and also the Trace calls added in the call below.
Apart from solving the problem, it would be great to also understand how to debug/test this code (apart from introducing DI to inject NewsService).
public IObservable<IArticle> GetContents(string newsUrl, IScheduler scheduler)
{
var newsService = new NewsService(new HttpClient());
scheduler = scheduler ?? TaskPoolScheduler.Default;
var fetchObject = newsService
.GetNewsArticles(newsUrl,scheduler)
.Do(x => Trace.WriteLine($"Parsing Articles {x.Title}"));
return fetchObject.Publish(fetchSubject =>
{
var updateObs = fetchSubject
.Do( x =>
{
// Save to database, all sync calls
})
.Where(x => false)
.Catch(Observable.Empty<Article>());
var dbArticleObs = Observable.Create<IArticle>(o =>
{
return scheduler.ScheduleAsync(async (ctrl, ct) =>
{
using (var session = dataBase.GetSession())
{
var articles = await session.GetArticlesAsync(newsUrl, ct);
foreach (var article in articles)
{
o.OnNext(article);
}
}
o.OnCompleted();
});
});
return
dbArticleObs // First get all the articles from dataBase cache
.Concat(fetchSubject // Get the latest articles from web service
.Catch(Observable.Empty<Article>())
.Merge(updateObs)) // Update the database with latest articles
.Do(x => Trace.WriteLine($"Displaying {x.Title}"));
});
}
UPDATE - Added GetArticles
public IObservable<IContent> GetArticles(string feedUrl, IScheduler scheduler)
{
return Observable.Create<IContent>(o =>
{
scheduler = scheduler ?? DefaultScheduler.Instance;
scheduler.ScheduleAsync(async (ctrl, ct) =>
{
try
{
using (var inputStream = await Client.GetStreamAsync(feedUrl))
{
var settings = new XmlReaderSettings
{
IgnoreComments = true,
IgnoreProcessingInstructions = true,
IgnoreWhitespace = true,
Async = true
};
//var parsingState = ParsingState.Channel;
Article article = null;
Feed feed = null;
using (var reader = XmlReader.Create(inputStream, settings))
{
while (await reader.ReadAsync())
{
ct.ThrowIfCancellationRequested();
if (reader.IsStartElement())
{
switch (reader.LocalName)
{
...
// parsing logic goes here
...
}
}
else if (reader.LocalName == "item" &&
reader.NodeType == XmlNodeType.EndElement)
{
o.OnNext(article);
}
}
}
o.OnCompleted();
}
}
catch (Exception e)
{
o.OnError(e);
}
});
return Disposable.Empty;
});
}
UPDATE 2
Sharing the link to source code here.
There's a few things I don't like about your code. I assume NewsService is an IDisposable as it takes an HttpClient (which is disposable). You're not doing a proper clean up.
Also, you haven't provided a complete method - because you've tried cutting it down for the question - but that makes it hard to reason about how to rewrite the code.
That said, the one thing that sticks out to me as quite horrid looking is the Observable.Create. Can you please try this code instead and see if it helps things work for you?
var dbArticleObs =
Observable
.Using(
() => dataBase.GetSession(),
session =>
from articles in Observable.FromAsync(ct => session.GetArticlesAsync(newsUrl, ct))
from article in articles
select article);
Now, if that does, try rewriting fetchObject to use the same Observable.Using when newing up the `NewService.
In any case, it would be good if you could provide a complete implementation of GetContents, NewsService and your dataBase code in your question.
I have problem getting a "CodeFluent.Runtime.CodeFluentDuplicateException" and i'm probably missing something fundamental.
However i first followed this blog about using Servicestack and codefluents and made my own template.
I have no problems to get entities but doing a put give me an exception mentioned.
Ok maybe i have done some wrong in my template so i took another approach looking for answers i found a "complete" project using Webapi and a template, ready to use. Generate ASP .NET Web API Controllers using Templates.
This generates all the controllers and seems to work. However i have the same exeption when using the "put".
This is an example of generated controller code for Put
public HttpResponseMessage Put([FromBody]Country value)
{
if (value == null || !value.Save())
{
return Request.CreateResponse(HttpStatusCode.BadRequest);
}
return Request.CreateResponse(HttpStatusCode.OK, value);
}
This is how i use the controller above inside a Xamarin.Forms solution.
public async Task UpdateAsync(Country update, bool isNewItem=false)
{
HttpClient client = new HttpClient();
// RestUrl = http://developer.xamarin.com:8081/api/todoitems{0}
var uri = new Uri(string.Format(Constants.RestUrl2, update.Id));
try
{
var json = JsonConvert.SerializeObject(update);
var content = new StringContent(json, Encoding.UTF8, "application/json");
HttpResponseMessage response = null;
if (isNewItem)
{
response = await client.PostAsync(uri, content);
}
else
{
response = await client.PutAsync(uri, content);
}
if (response.IsSuccessStatusCode)
{
Debug.WriteLine(#" TodoItem successfully saved.");
}
}
catch (Exception ex)
{
Debug.WriteLine(#" ERROR {0}", ex.Message);
}
}
Any suggestions of what i'm missing?
Thanks for any help
//Greg
I got the answer from the softfluent support
"..
Another case of duplicate exception is when you enable optimistic concurrency and the RowVersion of the instance you are updating is null. In this case, the stored procedure will insert the row instead of updating it.
.."
Changeing the concurrencyMode=None did the trick
I'm new to Xamarin and developing native apps in general (I have made html5 apps in the past).
I have started on a Xamarin.Forms project and I'm trying to contact a REST like API (need to GET an URL which will return a json array).
Normally from C# I would use RestSharp and perform this call using the RestClient.
I'm not having any luck installing that package from Xamarin Studio though, but I have got the Microsoft HTTP Libraries installed.
I'm pretty sure this is a very trivial task to perform, I just haven't been able to adapt the samples I have found online to work for me.
Anyone who could post how this is done please (remember I'm new to this so don't expect me to understand everything that is different from say a normal console app)?
It is easy with HTTP Client and JSON.NET here is a example of a GET:
public async Task<List<Appointment>> GetDayAppointments(DateTime day)
{
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer " + App.apiToken);
//Your url.
string resourceUri = ApiBaseAddress;
HttpResponseMessage result = await client.GetAsync (resourceUri, CancellationToken.None);
if (result.IsSuccessStatusCode) {
try {
return GetDayAppointmentsList(result);
} catch (Exception ex) {
Console.WriteLine (ex.Message);
}
} else {
if(TokenExpired(result)){
App.SessionExpired = true;
App.ShowLogin();
}
return null;
}
return null;
}
private List<Appointment> GetDayAppointmentsList(HttpResponseMessage result){
string content = result.Content.ReadAsStringAsync ().Result;
JObject jresponse = JObject.Parse (content);
var jarray = jresponse ["citas"];
List<Appointment> AppoinmentsList = new List<Appointment> ();
foreach (var jObj in jarray) {
Appointment newApt = new Appointment ();
newApt.Guid = (int)jObj ["id"];
newApt.PatientId = (string)jObj ["paciente"];
newApt.Name = (string)jObj ["nombre"];
newApt.FatherLstName = (string)jObj ["paterno"];
newApt.MotherLstName = (string)jObj ["materno"];
string strStart = (string)jObj ["horaIni"];
TimeSpan start;
TimeSpan.TryParse (strStart, out start);
newApt.StartDate = start;
string strEnd = (string)jObj ["horaFin"];
TimeSpan end;
TimeSpan.TryParse (strEnd, out end);
newApt.EndDate = end;
AppoinmentsList.Add (newApt);
}
return AppoinmentsList;
}
I use System.Net.WebClient and our asp.net WebAPI interface:
public string GetData(Uri uri)
{//uri like "https://webapi.main.cz/api/root"
string ret = "ERROR";
try
{
using (WebClient webClient = new WebClient())
{
//You can set webClient.Headers there
webClient.Encoding = System.Text.Encoding.UTF8;
ret = webClient.DownloadString(uri));//Test some data received
//In ret you can have JSON string
}
}
catch (Exception ex) { ret = ex.Message; }
return ret;
}
4
public string SendData(Uri uri, byte[] data)
{//uri like https://webapi.main.cz/api/PostCheckLicence/
string ret = "ERROR";
try
{
using (WebClient webClient = new WebClient())
{
webClient.Headers[HttpRequestHeader.Accept] = "application/octet-stream";
webClient.Headers[HttpRequestHeader.ContentType] = "text/bytes";
webClient.Encoding = System.Text.Encoding.ASCII;
byte[] result = webClient.UploadData(uri, data);
ret = Encoding.ASCII.GetString(result);
if (ret.Contains("\"ResultWebApi\":\"OK"))
{//In ret you can have JSON string
}
else
{
}
}
}
catch (Exception ex) { ret = ex.Message; }
return ret;
}
x
I've some examples in my Github repo. Just grab the classes there and give them a try. The API is really easy to use:
await new Request<T>()
.SetHttpMethod(HttpMethod.[Post|Put|Get|Delete].Method) //Obligatory
.SetEndpoint("http://www.yourserver.com/profilepic/") //Obligatory
.SetJsonPayload(someJsonObject) //Optional if you're using Get or Delete, Obligatory if you're using Put or Post
.OnSuccess((serverResponse) => {
//Optional action triggered when you have a succesful 200 response from the server
//serverResponse is of type T
})
.OnNoInternetConnection(() =>
{
// Optional action triggered when you try to make a request without internet connetion
})
.OnRequestStarted(() =>
{
// Optional action triggered always as soon as we start making the request i.e. very useful when
// We want to start an UI related action such as showing a ProgressBar or a Spinner.
})
.OnRequestCompleted(() =>
{
// Optional action triggered always when a request finishes, no matter if it finished successufully or
// It failed. It's useful for when you need to finish some UI related action such as hiding a ProgressBar or
// a Spinner.
})
.OnError((exception) =>
{
// Optional action triggered always when something went wrong it can be caused by a server-side error, for
// example a internal server error or for something in the callbacks, for example a NullPointerException.
})
.OnHttpError((httpErrorStatus) =>
{
// Optional action triggered when something when sending a request, for example, the server returned a internal
// server error, a bad request error, an unauthorize error, etc. The httpErrorStatus variable is the error code.
})
.OnBadRequest(() =>
{
// Optional action triggered when the server returned a bad request error.
})
.OnUnauthorize(() =>
{
// Optional action triggered when the server returned an unauthorize error.
})
.OnInternalServerError(() =>
{
// Optional action triggered when the server returned an internal server error.
})
//AND THERE'S A LOT MORE OF CALLBACKS THAT YOU CAN HOOK OF, CHECK THE REQUEST CLASS TO MORE INFO.
.Start();
And there's a couple of examples.
For all my Xamarin Forms app I use Tiny.RestClient.
It's easy to get it and easy to use it.
You have to download this nuget.
And after it just very easy to use it :
var client = new TinyRestClient(new HttpClient(), "http://MyAPI.com/api");
var cities = client.
GetRequest("City").
AddQueryParameter("id", 2).
AddQueryParameter("country", "France").
ExecuteAsync<City>> ();
Hopes that helps.