Question

我一直在尝试从Azure Functions内部调用认知服务，但运气不佳。我有一个Blob触发函数，该函数在将对象添加到Blob时启动。我想将内容输出到同一Function中的另一个Blob容器。

Answer 1

我能够通过以下方式实现这一目标

使用以下绑定创建了一个功能应用程序（Blob触发）：

"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

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);
}

我希望这会有所帮助。干杯! ：）

如何在Azure Functions中进行Web服务调用（至认知服务）？

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