Microsoft Cognitive Service Vision Client Identification Error ClientException
I'm trying to use Vision Cognitive Services to get an image description, but my code always throws this exception:
Exception Microsoft.ProjectOxford.Vision.ClientException
HResult=0x80131500
Origine=<Non è possibile valutare l'origine dell'eccezione>
Stack:
in Microsoft.ProjectOxford.Vision.VisionServiceClient.HandleException (Exception exception)
in Microsoft.ProjectOxford.Vision.VisionServiceClient.<SendAsync>b__42_1[TRequest,TResponse](Exception e)
in System.AggregateException.Handle(Func`2 predicate)
in Microsoft.ProjectOxford.Vision.VisionServiceClient.<SendAsync>d__42`2.MoveNext()
in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in Microsoft.ProjectOxford.Vision.VisionServiceClient.<AnalyzeImageAsync>d__21`1.MoveNext()
in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in Microsoft.ProjectOxford.Vision.VisionServiceClient.<AnalyzeImageAsync>d__20.MoveNext()
in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
in CognitiveServices.MainPage.<Button_Clicked>d__1.MoveNext() in C:\Users\manu9\documents\visual studio 2017\Projects\CognitiveServices\CognitiveServices\CognitiveServices\MainPage.xaml.cs: riga 48
This is my code:
using Microsoft.ProjectOxford.Vision;
using Microsoft.ProjectOxford.Vision.Contract;
using Plugin.Media;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace CognitiveServices
{
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
private async void Button_Clicked(object sender, EventArgs e)
{
var media = Plugin.Media.CrossMedia.Current;
await media.Initialize();
var file = await media.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
{
SaveToAlbum = false
});
image.Source = ImageSource.FromStream(() => file.GetStream());
var visionClient = new VisionServiceClient("MY_API_KEY");
var visualFeats = new VisualFeature[]
{
VisualFeature.Description,
VisualFeature.Faces
};
Stream imagestream = file.GetStream();
imagestream.Seek(0, SeekOrigin.Begin);
var result = await visionClient.AnalyzeImageAsync(imagestream, visualFeats);
description.Text = result.Description.Captions.First().Text;
Debug.WriteLine(result.Description.Captions[0].Text);
file.Dispose();
}
}
}
Why do I always have this exception? I read that someone solved this by adding something like imageStream.Seek(0)
, is this true?
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Most likely your API key does not match the endpoint you are pushing. If you look at the source code of the client , you can see that it goes to the western US ( https://westus.api.cognitive.microsoft.com/vision/v1.0
) by default , and your key may match (as it did in my case) with a different region.
You can change this by running new VisionServiceClient(apiKey, apiRoot)
where apiRoot
obtained through the Azure Portal:
Working code that outputs in my case Satya Nadella wearing glasses and smiling at the camera
.
using Microsoft.ProjectOxford.Vision;
using Microsoft.ProjectOxford.Vision.Contract;
using System;
using System.Configuration;
using System.IO;
namespace VisionClient
{
public class Program
{
public static void Main(string[] args)
{
AnalyzeImage();
Console.WriteLine("Press any key to exit...");
Console.ReadLine();
}
private static void AnalyzeImage()
{
var apiKey = ConfigurationManager.AppSettings["VisionApiSubscriptionKey"];
var apiRoot = "https://eastus2.api.cognitive.microsoft.com/vision/v1.0";
var visionClient = new VisionServiceClient(apiKey, apiRoot);
var visualFeats = new VisualFeature[]
{
VisualFeature.Description,
VisualFeature.Faces
};
Stream imageStream = File.OpenRead("satyaNadella.jpg");
try
{
AnalysisResult analysisResult = visionClient.AnalyzeImageAsync(imageStream, visualFeats).Result;
foreach(var caption in analysisResult.Description.Captions)
{
Console.WriteLine("Description: " + caption.Text);
}
}
catch (ClientException e)
{
Console.WriteLine("Vision client error: " + e.Error.Message);
}
catch (Exception e)
{
Console.WriteLine("Error: " + e.Message);
}
}
}
}
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