IT-Nexus/agent-cs/CaptureModeRunner.cs

using System.Drawing;
using System.Drawing.Imaging;
using System.Net.Sockets;

namespace ITNexusAgent;

// Läuft als User-Prozess (via schtasks), nicht als SYSTEM-Service
// Captured den Desktop und schickt JPEG-Frames via TCP Loopback an den Service
public static class CaptureModeRunner
{
    private static readonly ImageCodecInfo JpegCodec =
        ImageCodecInfo.GetImageEncoders().First(c => c.FormatID == ImageFormat.Jpeg.Guid);

    public static void Run(string portStr)
    {
        if (!int.TryParse(portStr, out var port) || port <= 0) return;

        try
        {
            using var tcp = new TcpClient();
            tcp.Connect("127.0.0.1", port);
            var stream = tcp.GetStream();

            var encParams = new EncoderParameters(1);
            encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 60L);

            // Alle Screens zusammenführen (Multi-Monitor-Support)
            var allScreens = System.Windows.Forms.Screen.AllScreens;
            int left = allScreens.Min(s => s.Bounds.X);
            int top = allScreens.Min(s => s.Bounds.Y);
            int right = allScreens.Max(s => s.Bounds.X + s.Bounds.Width);
            int bottom = allScreens.Max(s => s.Bounds.Y + s.Bounds.Height);
            int totalW = right - left;
            int totalH = bottom - top;

            while (tcp.Connected)
            {
                try
                {
                    using var bmp = new Bitmap(totalW, totalH, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                    using (var g = Graphics.FromImage(bmp))
                        g.CopyFromScreen(left, top, 0, 0, new Size(totalW, totalH));

                    byte[] jpeg;
                    using (var ms = new MemoryStream())
                    {
                        bmp.Save(ms, JpegCodec, encParams);
                        jpeg = ms.ToArray();
                    }

                    // 4-Byte Länge (LE) + JPEG-Daten
                    stream.Write(BitConverter.GetBytes(jpeg.Length));
                    stream.Write(jpeg);
                    stream.Flush();
                }
                catch { break; }

                Thread.Sleep(150); // ~6-7 fps
            }
        }
        catch { /* Verbindung fehlgeschlagen → Exit */ }
    }
}