/// <summary>
/// Vision - OCR - BatchRead from File Path -> Byte Array
/// </summary>
/// <param name="imageFilePath"></param>
/// <param name="apiVersion"></param>
/// <returns></returns>
public static async Task <Tuple <string, OCRObjectResult> > VisionOCRResultBatchReadFromImageAsync(string imageFilePath, string apiVersion)
{
// Computer Vision URL
var urlString = Config.COGNITIVE_SERVICES_REGION_URI + "/vision/" + apiVersion + "/read/core/asyncBatchAnalyze";
// return variables
var responseContent = string.Empty;
OCRObjectResult ocrObject = null;
string ocrResultString = string.Empty;
using (var httpClient = new HttpClient())
{
// Setup HttpClient
httpClient.BaseAddress = new Uri(urlString);
// Request headers
httpClient.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", Config.COGNITIVE_SERVICES_KEY);
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
// Reads the contents of the specified local image into a byte array.
byte[] byteData = Util.GetImageAsByteArray(imageFilePath);
// Adds the byte array as an octet stream to the request body.
using (ByteArrayContent content = new ByteArrayContent(byteData))
{
content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
// Make request with resiliency policy (can retry http requests)
var resilienyStrategy = CognitiveServicesRetryPolicy.DefineAndRetrieveResiliencyStrategy();
var response = await resilienyStrategy.ExecuteAsync(() => httpClient.PostAsync(urlString, content));
// read response and write to view
// batch call, you need to wait for the "job" to finish
if (response.IsSuccessStatusCode)
{
var urlLocation = response.Headers.GetValues("Operation-Location").FirstOrDefault();
var resilienyStrategyBatchJob = CognitiveServicesRetryPolicy.DefineAndRetrieveResiliencyStrategyForBatchJob();
var ocrResultResponse = await resilienyStrategyBatchJob.ExecuteAsync(() => httpClient.GetAsync(urlLocation));
if (ocrResultResponse.IsSuccessStatusCode)
{
ocrResultString = await ocrResultResponse.Content.ReadAsStringAsync();
if (string.IsNullOrEmpty(ocrResultString))
{
var test = ocrResultString;
}
}
ocrObject = JsonConvert.DeserializeObject <OCRObjectResult>(ocrResultString);
}
else
{
throw new Exception(response.StatusCode + " : " + response.ReasonPhrase);
}
}
}
return(new Tuple <string, OCRObjectResult>(ocrResultString, ocrObject));
}
public static async Task <Tuple <string, CustomVisionObjectResult> > CustomVisionObjectResult(string uri)
{
// Two Computer Vision API versions for OCR. v1.0 and v2.0 (in preview)
// v2.0 is based on newer AI technology
// Computer Vision URL
var urlString = "https://southcentralus.api.cognitive.microsoft.com/customvision/v2.0/Prediction/460af9b0-5e66-4e70-a84a-d402e413fe2d/url?iterationId=12848efa-e746-445d-8e45-8a5a58c33ba7";
// return variables
var responseContent = string.Empty;
CustomVisionObjectResult customVisionObjectResult = null;
using (var httpClient = new HttpClient())
{
// Setup HttpClient
httpClient.BaseAddress = new Uri(urlString);
// Request headers
// TODO: Change later, not used for now
httpClient.DefaultRequestHeaders.Add("Prediction-Key", string.Empty);
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
// Request body
var uriBody = "{\"url\":\"" + uri + "\"}";
using (var content = new StringContent(uriBody))
{
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
// Make request with resiliency policy (can retry http requests)
var resilienyStrategy = CognitiveServicesRetryPolicy.DefineAndRetrieveResiliencyStrategy();
var response = await resilienyStrategy.ExecuteAsync(() => httpClient.PostAsync(urlString, content));
//read response and write to view
if (response.IsSuccessStatusCode)
{
responseContent = await response.Content.ReadAsStringAsync();
}
else
{
throw new Exception(response.StatusCode + " : " + response.ReasonPhrase);
}
}
customVisionObjectResult = JsonConvert.DeserializeObject <CustomVisionObjectResult>(responseContent);
}
return(new Tuple <string, CustomVisionObjectResult>(responseContent, customVisionObjectResult));
}
