/*
* EXTRACT TEXT - URL IMAGE
*/
public async Task ExtractTextFromURL(string url)
{
const int numberOfCharsInOperationId = 36;
Console.WriteLine("----------------------------------------------------------");
Console.WriteLine("EXTRACT TEXT - URL");
Console.WriteLine();
Console.WriteLine($"Extracting text from url {url}...");
Console.WriteLine();
var headers = await _client.BatchReadFileWithHttpMessagesAsync(url);
string operationLocation = headers.Headers.OperationLocation;
// Retrieve the URI where the recognized text will be stored from the Operation-Location header.
// We only need the ID and not the full URL
string operationId = operationLocation.Substring(operationLocation.Length - numberOfCharsInOperationId);
// Extract the text
// Delay is between iterations and tries a maximum of 10 times.
int i = 0;
int maxRetries = 10;
ReadOperationResult results;
do
{
results = await _client.GetReadOperationResultAsync(operationId);
Console.WriteLine("Server status: {0}, waiting {1} seconds...", results.Status, i);
await Task.Delay(1000);
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
// Display the found text.
Console.WriteLine();
var recognitionResults = results.RecognitionResults;
foreach (TextRecognitionResult result in recognitionResults)
{
foreach (var line in result.Lines)
{
if (_reNumberPlate.IsMatch(line.Text))
{
Console.WriteLine(line.Text);
}
}
}
Console.WriteLine();
}
public async Task <string> ExtractLocalPrintedTextAsync(string photoUrl)
{
try
{
// TextRecognitionMode.Printed or TextRecognitionMode.Handwritten
var result = await _computerVision.BatchReadFileWithHttpMessagesAsync(photoUrl, TextRecognitionMode.Printed);
var res = await GetTextAsync(_computerVision, result.Headers.OperationLocation);
return(res);
}
catch (Exception ex)
{
throw ex;
}
}