static async Task GetTextFromImageAsync(ComputerVisionClient visionClient, string url)
{
BatchReadFileHeaders textHeaders = await visionClient.BatchReadFileAsync(url);
string operationLocation = textHeaders.OperationLocation;
int maxCharsInOperationId = 36;
string operationId = operationLocation.Substring(operationLocation.Length - maxCharsInOperationId);
int i = 0;
int maxRetries = 10;
ReadOperationResult results = null;
do
{
results = await visionClient.GetReadOperationResultAsync(operationId);
Console.WriteLine($"Статус сервера {results.Status}, выполняется {i} c");
await Task.Delay(1000);
if (i == 9)
{
Console.WriteLine("Сервер вызвал таймаут");
}
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
Console.WriteLine();
var textRecognitionResults = results.RecognitionResults;
foreach (TextRecognitionResult textRecognitionResult in results.RecognitionResults)
{
foreach (var line in textRecognitionResult.Lines)
{
Console.WriteLine(line.Text);
}
}
}
// Read text from a remote image
private static async Task ExtractRemoteTextAsync(
ComputerVisionClient computerVision, string imageUrl)
{
if (!Uri.IsWellFormedUriString(imageUrl, UriKind.Absolute))
{
Console.WriteLine(
"\nInvalid remoteImageUrl:\n{0} \n", imageUrl);
return;
}
// Start the async process to read the text
BatchReadFileHeaders textHeaders =
await computerVision.BatchReadFileAsync(
imageUrl);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
public async Task <IList <TextRecognitionResult> > BatchReadFileUrl(string imageUrl)
{
Console.WriteLine("----------------------------------");
Console.WriteLine("BATCH READ FILE - URL IMAGE");
Console.WriteLine("");
BatchReadFileHeaders textHeaders = await Client.BatchReadFileAsync(imageUrl);
var ol = textHeaders.OperationLocation;
// Retrieve the URI where the recognizer text will be stored from the Operatio-Location header.
// We only need the ID and not the full URL
const int numberOfCharsInOperationId = 36;
string operationId = ol.Substring(ol.Length - numberOfCharsInOperationId);
//Extract the text
// Delay is between iterations and tries a maximum of 10 times.
int i = 0;
int maxRetries = 10;
ReadOperationResult results;
Console.WriteLine($"Extracting text from URL image {Path.GetFileName(imageUrl)}...");
Console.WriteLine();
do
{
results = await Client.GetReadOperationResultAsync(operationId);
Console.WriteLine("Server status: {0}, waiting {1} seconds...", results.Status, i);
await Task.Delay(1000);
if (i == 9)
{
Console.WriteLine("Server timed out");
}
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) &&
i++ < maxRetries);
Console.WriteLine();
return(results.RecognitionResults);
}
public async Task ExtractText(string data, bool flag)
{
ComputerVisionClient computerVision = new ComputerVisionClient(new ApiKeyServiceClientCredentials(subscriptionKey), new System.Net.Http.DelegatingHandler[] { });
//Endpoint
computerVision.Endpoint = Endpoint;
if (flag)
{
if (!Uri.IsWellFormedUriString(data, UriKind.Absolute))
{
Error = "Invalid remoteImageUrl: " + data;
}
//Starting the async process to read the text
BatchReadFileHeaders textHeaders = await computerVision.BatchReadFileAsync(data, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
else
{
//Image data to Byte Array
byte[] imageBytes = Convert.FromBase64String(data);
//Byte Array To Stream
Stream stream = new MemoryStream(imageBytes);
try
{
//Starting the async process to recognize the text
BatchReadFileInStreamHeaders textHeaders = await computerVision.BatchReadFileInStreamAsync(stream, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
catch (Exception e)
{
Error = e.Message;
}
}
}
public void BatchReadFileTest()
{
using (MockContext context = MockContext.Start(this.GetType().FullName))
{
HttpMockServer.Initialize(this.GetType().FullName, "BatchReadFileTest");
string imageUrl = GetTestImageUrl("signage.jpg");
using (IComputerVisionClient client = GetComputerVisionClient(HttpMockServer.CreateInstance()))
{
BatchReadFileHeaders headers = client.BatchReadFileAsync(imageUrl).Result;
Assert.NotNull(headers.OperationLocation);
ReadOperationResult readOperationResult = GetRecognitionResultWithPolling(client, headers.OperationLocation);
Assert.NotNull(readOperationResult);
Assert.Equal(TextOperationStatusCodes.Succeeded, readOperationResult.Status);
Assert.NotNull(readOperationResult.RecognitionResults);
Assert.Equal(1, readOperationResult.RecognitionResults.Count);
var recognitionResult = readOperationResult.RecognitionResults[0];
Assert.Equal(1, recognitionResult.Page);
Assert.Equal(250, recognitionResult.Width);
Assert.Equal(258, recognitionResult.Height);
Assert.Equal(TextRecognitionResultDimensionUnit.Pixel, recognitionResult.Unit);
Assert.Equal(
new string[] { "520", "WEST", "Seattle" }.OrderBy(t => t),
recognitionResult.Lines.Select(line => line.Text).OrderBy(t => t));
Assert.Equal(
new string[] { "520", "WEST", "Seattle" }.OrderBy(t => t),
recognitionResult.Lines.SelectMany(line => line.Words).Select(word => word.Text).OrderBy(t => t));
Assert.Equal(3, recognitionResult.Lines.Count);
}
}
}
