如何从Azure功能中进行web服务调用(对认知服务)

Question

我一直试图从Azure函数中调用认知服务，但运气不佳。我有一个Blob触发函数，当一个对象被添加到Blob时，它就会启动。我想将某些内容输出到同一Function中的另一个blob容器。

Answer 1

我能够通过以下方式实现

1. 创建了一个具有以下绑定的函数应用程序(Blob Triggered(：

   "bindings": [
   {
   "name": "myBlob",
   "type": "blobTrigger",
   "direction": "in",
   "path": "originals/{name}",
   "connection": "AzureWebJobsStorage"
   },
   {
   "type": "blob",
   "name": "outputBlob",
   "path": "extracted/processed-{name}.json",
   "connection": "AzureWebJobsStorage",
   "direction": "out"
   }
   ], "disabled": false
   

2. 使用了以下代码：

   #r "Newtonsoft.Json"
   using System;
   using System.Text;
   using System.Net.Http;
   using System.Net.Http.Headers;
   using Newtonsoft.Json;
   
   public static async Task Run(Stream myBlob, Stream outputBlob, TraceWriter log)
   {
   string subscriptionKey = "YOUR KEY HERE";
   string uriBase = "https://westcentralus.api.cognitive.microsoft.com/vision/v1.0/recognizeText";
   int ID = 0;
   String outputJSON = "json string to be written onto blob";
   HttpClient client = new HttpClient();
   client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
   string requestParameters = "handwriting=true";
   string uri = uriBase + "?" + requestParameters;
   HttpResponseMessage response = null;
   string operationLocation = null;
   HttpContent content = new StreamContent(myBlob);
   content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
   response = await client.PostAsync(uri, content);
   if (response.IsSuccessStatusCode)
   operationLocation = response.Headers.GetValues("Operation-Location").FirstOrDefault();
   else
   {
   log.Info("nError:n");
   log.Info((await response.Content.ReadAsStringAsync()));
   return;
   }
   string contentString;
   ...
   ...
   System.Threading.Thread.Sleep(1000);
   response = await client.GetAsync(operationLocation);
   contentString = await response.Content.ReadAsStringAsync();
   RootObject jObj = JsonConvert.DeserializeObject<RootObject>(contentString);
   log.Info(outputJSON); // at this point outputjson has the info needed to write onto the new blob
   byte[] data = Encoding.ASCII.GetBytes(outputJSON);
   outputBlob.Write(data,0,data.Length);
   }
   

我希望这能有所帮助。干杯！：(