Microsoft 认知服务视觉 API ClientException 错误
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【中文标题】Microsoft 认知服务视觉 API ClientException 错误【英文标题】:Microsoft Cognitive Service Vision API ClientException Error 【发布时间】:2017-10-12 09:24:59 【问题描述】:我正在尝试使用视觉认知服务来接收图像的描述,但我的代码总是抛出这个异常:
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
这是我的代码:
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();
为什么我总是有这个异常?我读到有人通过添加imageStream.Seek(0)
之类的内容解决了这个问题,这是真的吗?
【问题讨论】:
【参考方案1】:您的 API 密钥很可能与您要访问的端点不对应。如果您查看source code of the client,您会看到默认情况下它会命中美国西部 (https://westus.api.cognitive.microsoft.com/vision/v1.0
),并且您的密钥可能与另一个区域对应(就像我的情况一样)。
您可以通过new VisionServiceClient(apiKey, apiRoot)
更改此设置,其中apiRoot
是通过Azure 门户获得的:
在我的例子中输出Satya Nadella wearing glasses and smiling at the camera
的工作代码。
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);
【讨论】:
这为我解决了!希望 Azure Docs 提及这些事实!以上是关于Microsoft 认知服务视觉 API ClientException 错误的主要内容,如果未能解决你的问题,请参考以下文章
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