C# IronOCRによる非同期とマルチスレッドのサポート — 高速テキスト抽出・文字起こし

using IronOcr;

IronTesseract ocr = new IronTesseract();

OcrPdfInput largePdf = new OcrPdfInput("chapter1.pdf");

Func<OcrResult> reader = () =>
{
    return ocr.Read(largePdf);
};

OcrReadTask readTask = new OcrReadTask(reader.Invoke);
// Start the OCR task asynchronously
readTask.Start();

// Continue with other tasks while OCR is in progress
DoOtherTasks();

// Wait for the OCR task to complete and retrieve the result
OcrResult result = await Task.Run(() => readTask.Result);

Console.Write($"##### OCR RESULTS ###### \n {result.Text}");

largePdf.Dispose();
readTask.Dispose();

static void DoOtherTasks()
{
    // Simulate other tasks being performed while OCR is in progress
    Console.WriteLine("Performing other tasks...");
    Thread.Sleep(2000); // Simulating work for 2000 milliseconds
}

Imports Microsoft.VisualBasic
Imports IronOcr

Private ocr As New IronTesseract()

Private largePdf As New OcrPdfInput("chapter1.pdf")

Private reader As Func(Of OcrResult) = Function()
	Return ocr.Read(largePdf)
End Function

Private readTask As New OcrReadTask(AddressOf reader.Invoke)
' Start the OCR task asynchronously
readTask.Start()

' Continue with other tasks while OCR is in progress
DoOtherTasks()

' Wait for the OCR task to complete and retrieve the result
Dim result As OcrResult = Await Task.Run(Function() readTask.Result)

Console.Write($"##### OCR RESULTS ###### " & vbLf & " {result.Text}")

largePdf.Dispose()
readTask.Dispose()

'INSTANT VB TODO TASK: Local functions are not converted by Instant VB:
'static void DoOtherTasks()
'{
'	' Simulate other tasks being performed while OCR is in progress
'	Console.WriteLine("Performing other tasks...");
'	Thread.Sleep(2000); ' Simulating work for 2000 milliseconds
'}

using IronOcr;
using System;
using System.Threading.Tasks;

IronTesseract ocr = new IronTesseract();

using (OcrPdfInput largePdf = new OcrPdfInput("PDFs/example.pdf"))
{
    var result = await ocr.ReadAsync(largePdf);
    DoOtherTasks();
    Console.Write($"##### OCR RESULTS ###### " +
                $"\n {result.Text}");
}

static void DoOtherTasks()
{
    // Simulate other tasks being performed while OCR is in progress
    Console.WriteLine("Performing other tasks...");
    System.Threading.Thread.Sleep(2000); // Simulating work for 2000 milliseconds
}

Imports Microsoft.VisualBasic
Imports IronOcr
Imports System
Imports System.Threading.Tasks

Private ocr As New IronTesseract()

Using largePdf As New OcrPdfInput("PDFs/example.pdf")
	Dim result = Await ocr.ReadAsync(largePdf)
	DoOtherTasks()
	Console.Write($"##### OCR RESULTS ###### " & $vbLf & " {result.Text}")
End Using

'INSTANT VB TODO TASK: Local functions are not converted by Instant VB:
'static void DoOtherTasks()
'{
'	' Simulate other tasks being performed while OCR is in progress
'	Console.WriteLine("Performing other tasks...");
'	System.Threading.Thread.Sleep(2000); ' Simulating work for 2000 milliseconds
'}