MoS2/App/SicUI/Controls/CameraControl.xaml.cs

using Aitex.Core.RT.Log;
using CommandLine;
using MECF.Framework.Common.DataCenter;
using SicUI.Controls.M2C4Parts;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using VM.PlatformSDKCS;

namespace SicUI.Controls
{
    /// <summary>
    /// CameraControl.xaml 的交互逻辑
    /// </summary>
    public partial class CameraControl : UserControl
    {

        private WriteableBitmap _bitmap;
        private Int32Rect _rect;
        private CancellationTokenSource _cts;

        public CameraControl()
        {
            InitializeComponent();

            // 获取摄像头分辨率
            var width = (int)QueryDataClient.Instance.Service.GetConfig("HikGigeCamera.Width");
            var height = (int)QueryDataClient.Instance.Service.GetConfig("HikGigeCamera.Height");

            // 创建 WriteableBitmap，注意像素格式需要与摄像头输出匹配（例如 Bgr24）
            _bitmap = new WriteableBitmap(width, height, 96, 96, System.Windows.Media.PixelFormats.Bgr24, null);
            _rect = new Int32Rect(0, 0, _bitmap.PixelWidth, _bitmap.PixelHeight);
            // 只需设置一次 Source，不必每帧重新赋值
            imageControl.Source = _bitmap;

        }

        private async Task CaptureLoop(CancellationToken token)
        {
            while (!token.IsCancellationRequested)
            {
                try
                {
                    var obj = QueryDataClient.Instance.Service.GetData($"LoadLock.HikGigeCamera.CamBitmap");
                    if (obj != null)
                    {
                        Bitmap b = BytesToBitmap((byte[])obj);
                        // 在 UI 线程更新图像数据
#pragma warning disable CS4014
                        Application.Current.Dispatcher.BeginInvoke(
                            DispatcherPriority.Background,
                            new Action(() => UpdateBitmap(b)));
#pragma warning restore CS4014
                    }
                }
                catch (Exception ex)
                {
                    LOG.Warning($"Camera Capture failed{ex}");
                }

                // 根据需要调整延时，防止 CPU 占用过高
                // 异步延时，释放后台线程资源，并响应取消请求
                try
                {
                    await Task.Delay(20, token);
                }
                catch (OperationCanceledException)
                {
                    break;
                }
            }
        }

        public Bitmap BytesToBitmap(byte[] bytes)
        {
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                return new Bitmap(ms); // 或使用Image.FromStream:ml-citation{ref="1,18" data="citationList"}
            }
        }

        /// <summary>
        /// 更新预先创建的 WriteableBitmap 的像素数据
        /// </summary>
        private void UpdateBitmap(Bitmap frame)
        {
            if (frame == null || _bitmap == null) return;

            _bitmap.Lock();
            try
            {
                // 3. 移除类级别的 _bitmapData，改为局部变量
                var rect = new System.Drawing.Rectangle(0, 0, frame.Width, frame.Height);
                var bitmapData = frame.LockBits(rect, ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
                try
                {
                    int size = bitmapData.Height * bitmapData.Stride;
                    _bitmap.WritePixels(_rect, bitmapData.Scan0, size, bitmapData.Stride, 0, 0);
                }
                finally
                {
                    // 4. 无论如何必须解锁 GDI 数据
                    frame.UnlockBits(bitmapData);
                }
            }
            finally
            {
                // 5. 无论如何必须释放 Bitmap 和解锁 WriteableBitmap
                frame.Dispose();
                _bitmap.Unlock();
            }

        }

        private void ButtonGrab_Click(object sender, RoutedEventArgs e)
        {
            InvokeClient.Instance.Service.DoOperation($"LoadLock.HikGigeCamera.Grab","UIGrab");
        }

        private void ButtonGrabbing_Click(object sender, RoutedEventArgs e)
        {
            InvokeClient.Instance.Service.DoOperation($"LoadLock.HikGigeCamera.Grabbing");
        }

        private void CameraControl_Unloaded(object sender, RoutedEventArgs e)
        {
            _cts?.Cancel();
            InvokeClient.Instance.Service.DoOperation($"LoadLock.HikGigeCamera.Stop");
        }

        private void CameraControl_loaded(object sender, RoutedEventArgs e)
        {
            _cts = new CancellationTokenSource();
            _ = CaptureLoop(_cts.Token);
        }

        private void ButtonStop_Click(object sender, RoutedEventArgs e)
        {
            InvokeClient.Instance.Service.DoOperation($"LoadLock.HikGigeCamera.Stop");
        }
    }
}