1using System;
 2using System.Diagnostics;
 3using System.Drawing;
 4using System.Drawing.Imaging;
 5using System.IO;
 6using System.Text;
 7
 8namespace WindowCapture.Helpers
 9{
10    /// <summary>
11    /// Calls the bundled .NET 8 Windows-OCR helper (bin/Ocr/WC.Ocr.exe, WinRT Windows.Media.Ocr)
12    /// to extract text from an image. Local, offline, free; RU + EN. Returns null on failure.
13    /// </summary>
14    public static class OcrClient
15    {
16        public static string HelperPath()
17        {
18            return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Ocr", "WC.Ocr.exe");
19        }
20
21        public static bool IsAvailable { get { return File.Exists(HelperPath()); } }
22
23        /// <summary>Recognize text in the image. lang is a BCP-47 tag ("ru"/"en"); the helper falls
24        /// back to the user's profile languages if it's unavailable.</summary>
25        public static string Recognize(Bitmap image, string lang)
26        {
27            if (image == null) return null;
28            string exe = HelperPath();
29            if (!File.Exists(exe)) return null;
30
31            string tmp = Path.Combine(Path.GetTempPath(), "wc_ocr_" + Guid.NewGuid().ToString("N") + ".png");
32            try
33            {
34                image.Save(tmp, ImageFormat.Png);
35                var psi = new ProcessStartInfo
36                {
37                    FileName = exe,
38                    Arguments = "\"" + tmp + "\" " + (lang ?? ""),
39                    UseShellExecute = false,
40                    RedirectStandardOutput = true,
41                    RedirectStandardError = true,
42                    CreateNoWindow = true,
43                    StandardOutputEncoding = Encoding.UTF8
44                };
45                using (var p = Process.Start(psi))
46                {
47                    string outText = p.StandardOutput.ReadToEnd();
48                    p.StandardError.ReadToEnd(); // drain so the child can't block on a full stderr buffer
49                    if (!p.WaitForExit(15000)) { try { p.Kill(); } catch { } return null; }
50                    if (p.ExitCode != 0) return null;
51                    return outText;
52                }
53            }
54            catch { return null; }
55            finally { try { File.Delete(tmp); } catch { } }
56        }
57    }
58}