using System;
using System.Runtime.InteropServices;

class WindowInteractor
{
    [DllImport("user32.dll", SetLastError = true)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    public IntPtr GetWindowHandle(string windowName)
    {
        return FindWindow(null, windowName);
    }

    // Example usage
    // var handle = GetWindowHandle("Untitled - Notepad");
}

[DllImport("user32.dll")]
private static extern IntPtr GetDC(IntPtr hWnd);

[DllImport("user32.dll")]
private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

public IntPtr GetWindowDC(IntPtr hWnd)
{
    return GetDC(hWnd);
}

using System.Drawing;

public Bitmap CaptureWindow(IntPtr hWnd)
{
    // Get window rectangle
    RECT rect;
    GetWindowRect(hWnd, out rect);

    // Create compatible bitmap
    Bitmap bmp = new Bitmap(rect.Width, rect.Height);
    using (Graphics gfxBmp = Graphics.FromImage(bmp))
    {
        IntPtr hdcBitmap = gfxBmp.GetHdc();

        // BitBlt function to copy pixel data
        BitBlt(hdcBitmap, 0, 0, rect.Width, rect.Height, hDC, 0, 0, TernaryRasterOperations.SRCCOPY);
 
        gfxBmp.ReleaseHdc(hdcBitmap);
    }
    return bmp;
}

[DllImport("gdi32.dll")]
private static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjSource, int nXSrc, int nYSrc, int dwRop);

using OpenCvSharp;
 
public Point FindIconInImage(Bitmap screenshot, Bitmap icon)
{
    // Convert bitmap images to OpenCV matrices
    Mat screenMat = BitmapConverter.ToMat(screenshot);
    Mat iconMat = BitmapConverter.ToMat(icon);

    // Use template matching
    Mat result = new Mat();
    Cv2.MatchTemplate(screenMat, iconMat, result, TemplateMatchModes.CCoeffNormed);

    // Find the best match
    double minVal, maxVal;
    Point minLoc, maxLoc;
    Cv2.MinMaxLoc(result, out minVal, out maxVal, out minLoc, out maxLoc);

    if (maxVal > 0.8)
    {
        return maxLoc;
    }
    throw new Exception("Icon not found in image.");
}