cognitive vision library error : the remote server returned an error (401) in xamarin project

Question

当我尝试在 xamarin 项目中使用认知视觉库时，我收到一条错误消息：远程服务器返回错误 (401) 我正在使用 VisionServiceClient 对象此代码是分析所选图片的代码。我无法修复错误。有什么建议吗？

PS : 使用免费试用Api密钥有什么问题吗？这可能是错误的原因？我应该有一张信用卡来在 https://portal.azure.com/#home 中创建一个认知视觉资源实例吗？

这是 main_page 代码：

using Microsoft.ProjectOxford.Vision;
using Microsoft.ProjectOxford.Vision.Contract;
using Plugin.Connectivity;
using Plugin.Media;
using Plugin.Media.Abstractions;
using System;
using System.IO;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace ComputerVisionSample
{
    public partial class MainPage : ContentPage
    {
        private readonly VisionServiceClient visionClient;
        public MainPage()
        {
            InitializeComponent();
            this.visionClient = 
                new VisionServiceClient("my_api_key");
        }
        private async Task<AnalysisResult> AnalyzePictureAsync(Stream inputFile)
        {
            if (!CrossConnectivity.Current.IsConnected)
            {
                await DisplayAlert("Network error", 
                    "Please check your network connection and retry.", "OK");
                return null;
            }

            VisualFeature[] visualFeatures = new VisualFeature[] { VisualFeature.Adult,
                VisualFeature.Categories, VisualFeature.Color, VisualFeature.Description,
                VisualFeature.Faces, VisualFeature.ImageType, VisualFeature.Tags };

            AnalysisResult analysisResult = 
                await visionClient.AnalyzeImageAsync(inputFile, 
                visualFeatures);

            return analysisResult;            
        }

        private async void UploadPictureButton_Clicked(object sender, EventArgs e)
        {
            if (!CrossMedia.Current.IsPickPhotoSupported)
            {
                await DisplayAlert("No upload", "Picking a photo is not supported.", "OK");
                return;
            }

            var file = await CrossMedia.Current.PickPhotoAsync();
            if (file == null)
                return;

            this.Indicator1.IsVisible = true;
            this.Indicator1.IsRunning = true;
            Image1.Source = ImageSource.FromStream(() => file.GetStream());

            try
            {
                this.BindingContext = await AnalyzePictureAsync(file.GetStream());
            }
            catch (Exception ex)
            {
                await DisplayAlert("Error", ex.Message, "OK");
                return;
            }
            finally
            {
                this.Indicator1.IsRunning = false;
                this.Indicator1.IsVisible = false;
            }
        }
    }
}

Answer 1

如果您有 401，则表示：

您没有提供订阅密钥
或者您提供了一个，但它与您的资源所在的区域不匹配

您正在使用 ComputerVision 的默认值 endpoint/region，方法如下：

this.visionClient = new VisionServiceClient("my_api_key");

并且您使用的是旧包（Microsoft.ProjectOxford.Vision 是项目代号）。

因此，您应该执行以下操作：

1 - 切换到名为 Microsoft.Azure.CognitiveServices.Vision.ComputerVision 的最新包，在 Nuget here

上可用

2 - 通过执行以下操作创建您的客户端：

var visionClient = new ComputerVisionClient(new ApiKeyServiceClientCredentials("yourAPIkeyHere")))
{
    Endpoint = "yourEndpointHere"
})

端点格式为：“https://region.api.cognitive.microsoft.com", for example for West Europe: "https://westeurope.api.cognitive.microsoft.com”

您调用的方法或参数可能会因为包的变化而发生一些变化，但您现在将是up-to-date

cognitive vision library error : the remote server returned an error (401) in xamarin project

cognitive vision library error : the remote server returned an error (401) in xamarin project

c#

xamarin

microsoft-cognitive

azure-cognitive-services