c# - 如何在 C# 中设置来自 Google Cloud Vision 的 GOOGLE_APPLICATION_CREDENTIALS？

Question

我正在关注 this tutorial使用 Google Vision API，但即使配置身份验证凭据，我也会收到以下错误:

System.InvalidOperationException: 'The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.'

我在 Visual Studio 2017 中的代码:

        // Instantiates a client
        var client = ImageAnnotatorClient.Create();
        // Load the image file into memory
        var image = Google.Cloud.Vision.V1.Image.FromFile(@"C:\Users\Maicon\OneDrive\Área de Trabalho\keyboardSantander\keyboard.png");
        // Performs label detection on the image file
        var response = client.DetectLabels(image);
        foreach (var annotation in response)
        {
            if (annotation.Description != null)
                debugOutput(annotation.Description);
        }

我该怎么做才能解决这个问题？我是否必须创建试用帐户才能使用 Google Cloud API？

Answer 1

我尝试了以上所有方法，仍然没有运气。对我有用的是通过 Environment 类中的 SetEnvironmentVariable 添加环境变量。

string credential_path = @"PATH TO GOOGLE AUTH CREDENTIAL JSON FILE";
System.Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", credential_path);
            
var client = ImageAnnotatorClient.Create();

var image = Image.FromFile(@"PATH TO IMAGE");
           
var response = client.DetectDocumentText(image);