修改了后台视频录制等功能

backend/database.py

@@ -1103,12 +1103,15 @@ class DatabaseManager:
 
             cursor.execute('''
                 INSERT INTO detection_video (
-                    id, session_id, screen_video, timestamp
+                    id, session_id, screen_video, body_video, foot_video1, foot_video2, timestamp
-                ) VALUES (?, ?, ?, ?)
+                ) VALUES (?, ?, ?, ?, ?, ?, ?)
             ''', (
                 video_id,
                 session_id,
-                video.get('screen_video_path'),                
+                video.get('screen_video_path'),
+                video.get('body_video_path'),
+                video.get('foot_video1_path'),
+                video.get('foot_video2_path'),
                 china_time
             ))
 
@@ -1120,6 +1123,50 @@ class DatabaseManager:
             logger.error(f'保存检测视频失败: {e}')
             return False
 
+    def update_detection_video_latest(self, session_id: str, video: Dict[str, Any]) -> bool:
+        conn = self.get_connection()
+        cursor = conn.cursor()
+        try:
+            cursor.execute('''
+                SELECT id, screen_video, body_video, foot_video1, foot_video2
+                FROM detection_video
+                WHERE session_id = ?
+                ORDER BY timestamp DESC
+                LIMIT 1
+            ''', (session_id,))
+            row = cursor.fetchone()
+            if not row:
+                return self.save_detection_video(session_id, video)
+
+            row_dict = dict(row)
+            video_id = row_dict.get('id')
+
+            screen_video = video.get('screen_video_path')
+            body_video = video.get('body_video_path')
+            foot_video1 = video.get('foot_video1_path')
+            foot_video2 = video.get('foot_video2_path')
+
+            if not screen_video:
+                screen_video = row_dict.get('screen_video')
+            if not body_video:
+                body_video = row_dict.get('body_video')
+            if not foot_video1:
+                foot_video1 = row_dict.get('foot_video1')
+            if not foot_video2:
+                foot_video2 = row_dict.get('foot_video2')
+
+            cursor.execute('''
+                UPDATE detection_video
+                SET screen_video = ?, body_video = ?, foot_video1 = ?, foot_video2 = ?
+                WHERE id = ?
+            ''', (screen_video, body_video, foot_video1, foot_video2, video_id))
+            conn.commit()
+            return True
+        except Exception as e:
+            conn.rollback()
+            logger.error(f'更新检测视频失败: {e}')
+            return False
+
     def delete_detection_video(self, video_ids: Union[str, List[str]]) -> bool:
         """删除检测视频记录（支持单个或多个ID）"""
         conn = self.get_connection()

backend/devices/camera_manager.py

@@ -14,6 +14,7 @@ from typing import Optional, Dict, Any
 import logging
 import queue
 import gc
+import os
 
 try:
     from .base_device import BaseDevice
@@ -110,7 +111,19 @@ class CameraManager(BaseDevice):
         }
         
         # 全局帧队列（用于录制）
-        self.frame_queue = queue.Queue(maxsize=10)  # 最大长度10，自动丢弃旧帧
+        self.frame_queue = queue.Queue(maxsize=10)
+
+        self._recording_enabled = False
+        self._recording_session_id = None
+        self._recording_frames_dir = None
+        self._recording_target_fps = None
+        self._recording_last_ts = 0.0
+        self._recording_index = 0
+        self._recording_written = 0
+        self._recording_drop = 0
+        self._recording_queue = queue.Queue(maxsize=300)
+        self._recording_thread = None
+        self._recording_stop_event = threading.Event()
         
         # 属性缓存机制 - 避免重复设置相同属性值
         self._property_cache = {}
@@ -125,6 +138,130 @@ class CameraManager(BaseDevice):
             pass
         
         self.logger.info(f"相机管理器初始化完成 - 设备索引: {self.device_index}")
+
+    def start_jpeg_recording(self, session_id: str, frames_dir: str, record_fps: Optional[int] = None) -> Dict[str, Any]:
+        try:
+            if not session_id:
+                return {'success': False, 'message': '缺少session_id'}
+            if not frames_dir:
+                return {'success': False, 'message': '缺少frames_dir'}
+
+            try:
+                os.makedirs(frames_dir, exist_ok=True)
+            except Exception as e:
+                return {'success': False, 'message': f'创建录制目录失败: {e}'}
+
+            if record_fps is None:
+                record_fps = int(self.config_manager.get_config_value('CAMERA_RECORDING', 'fps', fallback='10'))
+            record_fps = max(1, int(record_fps))
+
+            self._recording_session_id = session_id
+            self._recording_frames_dir = frames_dir
+            self._recording_target_fps = record_fps
+            self._recording_last_ts = 0.0
+            self._recording_index = 0
+            self._recording_written = 0
+            self._recording_drop = 0
+            self._recording_stop_event.clear()
+            self._recording_enabled = True
+
+            if not self._recording_thread or not self._recording_thread.is_alive():
+                self._recording_thread = threading.Thread(
+                    target=self._recording_writer_loop,
+                    name=f"{self.device_id}-JpegWriter",
+                    daemon=True
+                )
+                self._recording_thread.start()
+
+            return {'success': True, 'message': '相机JPEG录制已启动', 'device_id': self.device_id, 'fps': record_fps, 'frames_dir': frames_dir}
+        except Exception as e:
+            return {'success': False, 'message': str(e)}
+
+    def stop_jpeg_recording(self, session_id: Optional[str] = None) -> Dict[str, Any]:
+        try:
+            if session_id and self._recording_session_id and session_id != self._recording_session_id:
+                return {'success': False, 'message': 'session_id不匹配'}
+
+            self._recording_enabled = False
+            self._recording_session_id = None
+            frames_dir = self._recording_frames_dir
+            fps = self._recording_target_fps
+            written = int(self._recording_written)
+            dropped = int(self._recording_drop)
+
+            self._recording_frames_dir = None
+            self._recording_target_fps = None
+            self._recording_last_ts = 0.0
+
+            self._recording_stop_event.set()
+            if self._recording_thread and self._recording_thread.is_alive():
+                self._recording_thread.join(timeout=2.0)
+            self._recording_thread = None
+
+            while not self._recording_queue.empty():
+                try:
+                    self._recording_queue.get_nowait()
+                except queue.Empty:
+                    break
+
+            self._recording_stop_event.clear()
+
+            return {
+                'success': True,
+                'message': '相机JPEG录制已停止',
+                'device_id': self.device_id,
+                'frames_dir': frames_dir,
+                'fps': fps,
+                'frames_written': written,
+                'frames_dropped': dropped
+            }
+        except Exception as e:
+            return {'success': False, 'message': str(e)}
+
+    def _recording_writer_loop(self):
+        while not self._recording_stop_event.is_set():
+            try:
+                item = self._recording_queue.get(timeout=0.2)
+            except queue.Empty:
+                continue
+
+            try:
+                frames_dir, idx, jpeg_bytes = item
+                if not frames_dir or not jpeg_bytes:
+                    continue
+                filename = f"frame_{idx:06d}.jpg"
+                fpath = os.path.join(frames_dir, filename)
+                with open(fpath, 'wb') as f:
+                    f.write(jpeg_bytes)
+                self._recording_written += 1
+            except Exception:
+                self._recording_drop += 1
+            finally:
+                try:
+                    self._recording_queue.task_done()
+                except Exception:
+                    pass
+
+    def _maybe_enqueue_recording(self, timestamp: float, frame_bytes: bytes):
+        if not self._recording_enabled:
+            return
+        frames_dir = self._recording_frames_dir
+        target_fps = self._recording_target_fps
+        if not frames_dir or not target_fps or target_fps <= 0:
+            return
+
+        if self._recording_last_ts > 0:
+            min_interval = 1.0 / float(target_fps)
+            if (timestamp - self._recording_last_ts) < min_interval:
+                return
+
+        idx = self._recording_index
+        self._recording_index += 1
+        self._recording_last_ts = timestamp
+        try:
+            self._recording_queue.put_nowait((frames_dir, idx, frame_bytes))
+        except queue.Full:
+            self._recording_drop += 1
         
     def _set_property_optimized(self, prop, value):
         """
@@ -649,23 +786,6 @@ class CameraManager(BaseDevice):
                 # 更新心跳时间，防止连接监控线程判定为超时
                 self.update_heartbeat()
                 
-                # 保存原始帧到队列（用于录制）
-                try:
-                    self.frame_queue.put_nowait({
-                        'frame': frame.copy(),
-                        'timestamp': time.time()
-                    })
-                except queue.Full:
-                    # 队列满时丢弃最旧的帧，添加新帧
-                    try:
-                        self.frame_queue.get_nowait()  # 移除最旧的帧
-                        self.frame_queue.put_nowait({
-                            'frame': frame.copy(),
-                            'timestamp': time.time()
-                        })
-                    except queue.Empty:
-                        pass  # 队列为空，忽略
-                
                 # 处理帧（降采样以优化传输负载）
                 processed_frame = self._process_frame(frame)
 
@@ -740,6 +860,7 @@ class CameraManager(BaseDevice):
             
             # 转换为bytes再做base64，减少中间numpy对象的长生命周期
             frame_bytes = buffer.tobytes()
+            self._maybe_enqueue_recording(time.time(), frame_bytes)
             frame_data = base64.b64encode(frame_bytes).decode('utf-8')
             
             # 发送数据
@@ -985,6 +1106,21 @@ class CameraManager(BaseDevice):
                     self.frame_queue.get_nowait()
                 except queue.Empty:
                     break
+
+            self._recording_enabled = False
+            self._recording_session_id = None
+            self._recording_frames_dir = None
+            self._recording_target_fps = None
+            self._recording_last_ts = 0.0
+            self._recording_stop_event.set()
+            if self._recording_thread and self._recording_thread.is_alive():
+                self._recording_thread.join(timeout=2.0)
+            self._recording_thread = None
+            while not self._recording_queue.empty():
+                try:
+                    self._recording_queue.get_nowait()
+                except queue.Empty:
+                    break
             
             self.last_frame = None
             

backend/devices/screen_recorder.py

@@ -13,7 +13,8 @@ import signal
 import base64
 from pathlib import Path
 from datetime import datetime
-from typing import Dict, Any, List, Optional
+from typing import Dict, Any, List, Optional, Callable
+import threading
 
 try:
     import pyautogui
@@ -39,11 +40,38 @@ class RecordingManager:
         # FFmpeg进程管理
         self._ffmpeg_processes = {}
         self._ffmpeg_meta = {}
+        self._transcode_threads = {}
         
         # 默认参数
         self.screen_fps = 25
         self.screen_size = self._get_screen_size()
 
+    def _resolve_ffmpeg_path(self) -> Optional[str]:
+        ffmpeg_path = None
+        if self.config_manager:
+            ffmpeg_path = (
+                self.config_manager.get_config_value('SCREEN_RECORDING', 'ffmpeg_path', fallback=None) or
+                self.config_manager.get_config_value('RECORDING', 'ffmpeg_path', fallback=None)
+            )
+        if ffmpeg_path and os.path.isfile(str(ffmpeg_path)):
+            return str(ffmpeg_path)
+        base_dir = os.path.dirname(sys.executable) if getattr(sys, 'frozen', False) else os.path.dirname(os.path.abspath(__file__))
+        alt_path = os.path.join(base_dir, 'ffmpeg', 'bin', 'ffmpeg.exe')
+        if os.path.isfile(alt_path):
+            return alt_path
+        return None
+
+    def get_active_video_base(self, session_id: str) -> Optional[Dict[str, Any]]:
+        meta = self._ffmpeg_meta.get('screen') or {}
+        if meta.get('session_id') != session_id:
+            return None
+        return {
+            'base_path': meta.get('base_path'),
+            'file_dir': meta.get('file_dir'),
+            'patient_id': meta.get('patient_id'),
+            'session_id': meta.get('session_id')
+        }
+
     def _get_screen_size(self):
         try:
             import pyautogui
@@ -82,20 +110,10 @@ class RecordingManager:
             os.makedirs(base_path, exist_ok=True)
             screen_video_path = os.path.join(base_path, 'screen.mp4')
             target_fps = fps or self.screen_fps
-            ffmpeg_path = None
+            ffmpeg_path = self._resolve_ffmpeg_path()
-            if self.config_manager:
+            if not ffmpeg_path:
-                ffmpeg_path = (
+                result['message'] = '未配置有效的ffmpeg_path，请在配置中设置 SCREEN_RECORDING.ffmpeg_path 或 RECORDING.ffmpeg_path'
-                    self.config_manager.get_config_value('SCREEN_RECORDING', 'ffmpeg_path', fallback=None) or
+                return result
-                    self.config_manager.get_config_value('RECORDING', 'ffmpeg_path', fallback=None)
-                )
-            if not ffmpeg_path or not os.path.isfile(str(ffmpeg_path)):
-                base_dir = os.path.dirname(sys.executable) if getattr(sys, 'frozen', False) else os.path.dirname(os.path.abspath(__file__))
-                alt_path = os.path.join(base_dir, 'ffmpeg', 'bin', 'ffmpeg.exe')
-                if os.path.isfile(alt_path):
-                    ffmpeg_path = alt_path
-                else:
-                    result['message'] = '未配置有效的ffmpeg_path，请在配置中设置 SCREEN_RECORDING.ffmpeg_path 或 RECORDING.ffmpeg_path'
-                    return result
 
             cmd = [
                 str(ffmpeg_path),
@@ -136,7 +154,7 @@ class RecordingManager:
                 creationflags=getattr(subprocess, 'CREATE_NEW_PROCESS_GROUP', 0)
             )
             self._ffmpeg_processes['screen'] = proc
-            self._ffmpeg_meta['screen'] = {'base_path': base_path, 'patient_id': patient_id, 'session_id': session_id, 'video_path': screen_video_path}
+            self._ffmpeg_meta['screen'] = {'base_path': base_path, 'file_dir': file_dir, 'patient_id': patient_id, 'session_id': session_id, 'video_path': screen_video_path}
             result['success'] = True
             result['message'] = 'ffmpeg录制已启动'
             result['database_updates'] = {
@@ -151,6 +169,86 @@ class RecordingManager:
             result['message'] = f'ffmpeg启动失败: {e}'
             return result
 
+    def transcode_jpeg_sequence_async(
+        self,
+        name: str,
+        frames_dir: str,
+        output_mp4_path: str,
+        fps: int,
+        on_done: Optional[Callable[[int], None]] = None
+    ) -> Dict[str, Any]:
+        try:
+            if not frames_dir or not os.path.isdir(frames_dir):
+                return {'success': False, 'message': 'frames_dir不存在'}
+            try:
+                os.makedirs(os.path.dirname(output_mp4_path), exist_ok=True)
+            except Exception:
+                pass
+
+            ffmpeg_path = self._resolve_ffmpeg_path()
+            if not ffmpeg_path:
+                return {'success': False, 'message': 'ffmpeg_path无效'}
+
+            codec = (
+                self.config_manager.get_config_value('CAMERA_RECORDING', 'ffmpeg_codec', fallback=None) or
+                self.config_manager.get_config_value('SCREEN_RECORDING', 'ffmpeg_codec', fallback=None) or
+                'libx264'
+            )
+            preset = (
+                self.config_manager.get_config_value('CAMERA_RECORDING', 'ffmpeg_preset', fallback=None) or
+                self.config_manager.get_config_value('SCREEN_RECORDING', 'ffmpeg_preset', fallback=None) or
+                ('p1' if codec == 'h264_nvenc' else 'ultrafast')
+            )
+            threads = int(self.config_manager.get_config_value('CAMERA_RECORDING', 'ffmpeg_threads', fallback='1') or '1')
+            bframes = int(self.config_manager.get_config_value('CAMERA_RECORDING', 'ffmpeg_bframes', fallback='0') or '0')
+            gop = int(self.config_manager.get_config_value('CAMERA_RECORDING', 'ffmpeg_gop', fallback=str(max(1, int(fps * 2)))) or str(max(1, int(fps * 2))))
+
+            input_pattern = os.path.join(frames_dir, 'frame_%06d.jpg')
+            cmd = [
+                str(ffmpeg_path),
+                '-y',
+                '-framerate', str(int(max(1, fps))),
+                '-start_number', '0',
+                '-i', input_pattern,
+                '-c:v', str(codec),
+                '-preset', str(preset),
+                '-bf', str(bframes),
+                '-g', str(gop),
+                '-pix_fmt', 'yuv420p',
+                '-threads', str(threads),
+                str(output_mp4_path)
+            ]
+
+            def worker():
+                code = 1
+                try:
+                    proc = subprocess.Popen(
+                        cmd,
+                        stdin=subprocess.DEVNULL,
+                        stdout=subprocess.DEVNULL,
+                        stderr=subprocess.DEVNULL,
+                        creationflags=getattr(subprocess, 'CREATE_NEW_PROCESS_GROUP', 0)
+                    )
+                    self._ffmpeg_processes[name] = proc
+                    code = proc.wait()
+                except Exception:
+                    code = 1
+                finally:
+                    self._ffmpeg_processes.pop(name, None)
+                    self._transcode_threads.pop(name, None)
+                    if on_done:
+                        try:
+                            on_done(int(code))
+                        except Exception:
+                            pass
+
+            t = threading.Thread(target=worker, name=f"FFmpegTranscode-{name}", daemon=True)
+            self._transcode_threads[name] = t
+            t.start()
+            return {'success': True, 'message': '转码任务已启动', 'name': name, 'output': output_mp4_path}
+        except Exception as e:
+            return {'success': False, 'message': str(e)}
+
     def stop_recording_ffmpeg(self, session_id: str = None) -> Dict[str, Any]:
         result = {'success': False, 'message': ''}
         try:

backend/devices/utils/license_manager.py

@@ -16,6 +16,7 @@ from cryptography.hazmat.primitives import hashes, serialization
 from cryptography.hazmat.primitives.asymmetric import rsa, padding
 from cryptography.exceptions import InvalidSignature
 import base64
+import shutil
 
 logger = logging.getLogger(__name__)
 
@@ -51,85 +52,345 @@ class LicenseManager:
     def __init__(self, config_manager=None):
         self.config_manager = config_manager
         self._machine_id = None
+        self._machine_id_candidates = None
         self._license_cache = None
         self._cache_timestamp = None
         
+    def _get_backend_base_dir(self) -> str:
+        return os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
+
+    def _get_persistent_license_dir(self) -> str:
+        system = platform.system()
+        if system == "Windows":
+            base = os.environ.get("PROGRAMDATA") or os.environ.get("ALLUSERSPROFILE") or ""
+            if not base:
+                base = os.path.expanduser("~\\AppData\\Local")
+        else:
+            base = os.path.expanduser("~/.config")
+        return os.path.join(base, "BodyCheck", "license")
+
+    def _get_configured_license_paths(self) -> Tuple[str, str, int]:
+        license_path = "data/license.json"
+        public_key_path = "backend/license_pub.pem"
+        grace_days = 3
+        if self.config_manager:
+            license_path = self.config_manager.get_config_value("LICENSE", "path", license_path)
+            public_key_path = self.config_manager.get_config_value("LICENSE", "public_key", public_key_path)
+            grace_days = int(self.config_manager.get_config_value("LICENSE", "grace_days", str(grace_days)))
+
+        if not os.path.isabs(license_path):
+            license_path = os.path.join(self._get_backend_base_dir(), license_path)
+        if not os.path.isabs(public_key_path):
+            public_key_path = os.path.join(self._get_backend_base_dir(), public_key_path)
+        return license_path, public_key_path, grace_days
+
+    def _get_persistent_license_paths(self) -> Tuple[str, str]:
+        pdir = self._get_persistent_license_dir()
+        return os.path.join(pdir, "license.json"), os.path.join(pdir, "license_public_key.pem")
+
+    def _resolve_license_paths(self) -> Tuple[str, str, int]:
+        cfg_license_path, cfg_public_key_path, grace_days = self._get_configured_license_paths()
+        p_license_path, p_public_key_path = self._get_persistent_license_paths()
+
+        effective_license_path = cfg_license_path
+        if not os.path.exists(effective_license_path) and os.path.exists(p_license_path):
+            effective_license_path = p_license_path
+
+        effective_public_key_path = cfg_public_key_path
+        if not os.path.exists(effective_public_key_path) and os.path.exists(p_public_key_path):
+            effective_public_key_path = p_public_key_path
+
+        return effective_license_path, effective_public_key_path, grace_days
+
+    def _mirror_license_assets(self, license_path: Optional[str] = None, public_key_path: Optional[str] = None) -> None:
+        p_license_path, p_public_key_path = self._get_persistent_license_paths()
+        pdir = os.path.dirname(p_license_path)
+        try:
+            os.makedirs(pdir, exist_ok=True)
+        except Exception:
+            return
+
+        if license_path and os.path.exists(license_path):
+            try:
+                shutil.copyfile(license_path, p_license_path)
+            except Exception:
+                pass
+        if public_key_path and os.path.exists(public_key_path):
+            try:
+                shutil.copyfile(public_key_path, p_public_key_path)
+            except Exception:
+                pass
+
+    def install_license_file(self, source_license_path: str) -> Tuple[bool, str]:
+        try:
+            if not os.path.exists(source_license_path):
+                return False, "源授权文件不存在"
+
+            cfg_license_path, cfg_public_key_path, _ = self._get_configured_license_paths()
+            os.makedirs(os.path.dirname(cfg_license_path), exist_ok=True)
+            shutil.copyfile(source_license_path, cfg_license_path)
+            self._mirror_license_assets(license_path=cfg_license_path, public_key_path=cfg_public_key_path)
+            return True, cfg_license_path
+        except Exception as e:
+            return False, str(e)
+
+    def mirror_license_dir(self, source_dir: str) -> None:
+        if not source_dir or not os.path.isdir(source_dir):
+            return
+        license_candidate = os.path.join(source_dir, "license.json")
+        pub_candidates = [
+            os.path.join(source_dir, "license_public_key.pem"),
+            os.path.join(source_dir, "license_pub.pem"),
+            os.path.join(source_dir, "public_key.pem"),
+        ]
+        pub_path = ""
+        for c in pub_candidates:
+            if os.path.exists(c):
+                pub_path = c
+                break
+        self._mirror_license_assets(license_path=license_candidate if os.path.exists(license_candidate) else None, public_key_path=pub_path or None)
+
+    def _run_powershell(self, command: str, timeout: int = 10) -> str:
+        try:
+            result = subprocess.run(
+                [
+                    "powershell",
+                    "-NoProfile",
+                    "-NonInteractive",
+                    "-ExecutionPolicy",
+                    "Bypass",
+                    "-Command",
+                    command,
+                ],
+                capture_output=True,
+                text=True,
+                timeout=timeout,
+            )
+            return (result.stdout or "").strip()
+        except Exception:
+            return ""
+
+    def _get_windows_cpu_id(self) -> str:
+        out = self._run_powershell(
+            "(Get-CimInstance -ClassName Win32_Processor | Select-Object -First 1 -ExpandProperty ProcessorId)"
+        )
+        return out.strip()
+
+    def _get_windows_baseboard_serial(self) -> str:
+        out = self._run_powershell(
+            "(Get-CimInstance -ClassName Win32_BaseBoard | Select-Object -First 1 -ExpandProperty SerialNumber)"
+        )
+        serial = out.strip()
+        if serial and serial != "To be filled by O.E.M.":
+            return serial
+        return ""
+
+    def _get_windows_disk_serials(self) -> list:
+        raw = self._run_powershell(
+            "$d=Get-CimInstance -ClassName Win32_DiskDrive | Select-Object SerialNumber,InterfaceType,PNPDeviceID,MediaType; $d | ConvertTo-Json -Compress"
+        )
+        if not raw:
+            return []
+        try:
+            data = json.loads(raw)
+        except Exception:
+            return []
+        disks = data if isinstance(data, list) else ([data] if isinstance(data, dict) else [])
+        serials = []
+        for d in disks:
+            serial = str((d.get("SerialNumber") or "")).strip()
+            iface = str((d.get("InterfaceType") or "")).strip().upper()
+            pnp = str((d.get("PNPDeviceID") or "")).strip().upper()
+            media = str((d.get("MediaType") or "")).strip().upper()
+            if serial and iface != "USB" and not pnp.startswith("USBSTOR") and "REMOVABLE" not in media:
+                serials.append(serial)
+        serials = sorted(set(serials))
+        return serials
+
+    def _get_windows_identifiers(self) -> Dict[str, Any]:
+        cpu_id = self._get_windows_cpu_id()
+        board_serial = self._get_windows_baseboard_serial()
+        disk_serials = self._get_windows_disk_serials()
+
+        if not cpu_id:
+            try:
+                result = subprocess.run(
+                    ["wmic", "cpu", "get", "ProcessorId", "/value"],
+                    capture_output=True,
+                    text=True,
+                    timeout=10,
+                )
+                for line in (result.stdout or "").split("\n"):
+                    if "ProcessorId=" in line:
+                        cpu_id = line.split("=", 1)[1].strip()
+                        if cpu_id:
+                            break
+            except Exception:
+                pass
+
+        if not board_serial:
+            try:
+                result = subprocess.run(
+                    ["wmic", "baseboard", "get", "SerialNumber", "/value"],
+                    capture_output=True,
+                    text=True,
+                    timeout=10,
+                )
+                for line in (result.stdout or "").split("\n"):
+                    if "SerialNumber=" in line:
+                        board_serial = line.split("=", 1)[1].strip()
+                        if board_serial and board_serial != "To be filled by O.E.M.":
+                            break
+                        board_serial = ""
+            except Exception:
+                pass
+
+        if not disk_serials:
+            try:
+                result = subprocess.run(
+                    [
+                        "wmic",
+                        "path",
+                        "Win32_DiskDrive",
+                        "get",
+                        "SerialNumber,InterfaceType,PNPDeviceID,MediaType",
+                        "/value",
+                    ],
+                    capture_output=True,
+                    text=True,
+                    timeout=10,
+                )
+                block = {}
+                serials = []
+                for line in (result.stdout or "").split("\n"):
+                    line = line.strip()
+                    if not line:
+                        serial = (block.get("SerialNumber") or "").strip()
+                        iface = (block.get("InterfaceType") or "").strip().upper()
+                        pnp = (block.get("PNPDeviceID") or "").strip().upper()
+                        media = (block.get("MediaType") or "").strip().upper()
+                        if serial and iface != "USB" and not pnp.startswith("USBSTOR") and "REMOVABLE" not in media:
+                            serials.append(serial)
+                        block = {}
+                        continue
+                    if "=" in line:
+                        k, v = line.split("=", 1)
+                        block[k] = v
+                if block:
+                    serial = (block.get("SerialNumber") or "").strip()
+                    iface = (block.get("InterfaceType") or "").strip().upper()
+                    pnp = (block.get("PNPDeviceID") or "").strip().upper()
+                    media = (block.get("MediaType") or "").strip().upper()
+                    if serial and iface != "USB" and not pnp.startswith("USBSTOR") and "REMOVABLE" not in media:
+                        serials.append(serial)
+                disk_serials = sorted(set(serials))
+            except Exception:
+                pass
+
+        mac = ""
+        try:
+            import uuid
+
+            mac = ":".join(
+                ["{:02x}".format((uuid.getnode() >> elements) & 0xFF) for elements in range(0, 2 * 6, 2)][::-1]
+            )
+        except Exception:
+            mac = ""
+
+        return {
+            "cpu_id": cpu_id.strip() if cpu_id else "",
+            "board_serial": board_serial.strip() if board_serial else "",
+            "disk_serials": disk_serials or [],
+            "mac": mac,
+            "node": platform.node(),
+            "processor": platform.processor(),
+        }
+
+    def _hash_core_info(self, core_info: list) -> str:
+        combined_info = "|".join(sorted(core_info))
+        return hashlib.sha256(combined_info.encode("utf-8")).hexdigest()[:16].upper()
+
+    def _build_machine_id_candidates(self) -> list:
+        system = platform.system()
+        info: Dict[str, Any] = {}
+        if system == "Windows":
+            info = self._get_windows_identifiers()
+        else:
+            info = {
+                "cpu_id": "",
+                "board_serial": "",
+                "disk_serials": [],
+                "mac": "",
+                "node": platform.node(),
+                "processor": platform.processor(),
+            }
+
+        cpu_id = info.get("cpu_id") or ""
+        board_serial = info.get("board_serial") or ""
+        disk_serials = info.get("disk_serials") or []
+        mac = info.get("mac") or ""
+
+        variants = []
+
+        full_core = []
+        if cpu_id:
+            full_core.append(f"CPU:{cpu_id}")
+        if board_serial:
+            full_core.append(f"BOARD:{board_serial}")
+        for s in disk_serials:
+            full_core.append(f"DISK:{s}")
+        if full_core:
+            variants.append(full_core)
+
+        no_disk = []
+        if cpu_id:
+            no_disk.append(f"CPU:{cpu_id}")
+        if board_serial:
+            no_disk.append(f"BOARD:{board_serial}")
+        if no_disk:
+            variants.append(no_disk)
+
+        if cpu_id:
+            variants.append([f"CPU:{cpu_id}"])
+        if board_serial:
+            variants.append([f"BOARD:{board_serial}"])
+
+        if mac:
+            variants.append([f"MAC:{mac}"])
+        if cpu_id and mac:
+            variants.append([f"CPU:{cpu_id}", f"MAC:{mac}"])
+
+        fallback_core = []
+        node = (info.get("node") or "").strip()
+        proc = (info.get("processor") or "").strip()
+        if node:
+            fallback_core.append(f"NODE:{node}")
+        if proc:
+            fallback_core.append(f"PROCESSOR:{proc}")
+        if fallback_core:
+            variants.append(fallback_core)
+
+        prefix = "W10-" if system == "Windows" else "FB-"
+        candidates = []
+        for core in variants:
+            try:
+                mid = f"{prefix}{self._hash_core_info(core)}"
+            except Exception:
+                continue
+            if mid not in candidates:
+                candidates.append(mid)
+        return candidates
+
     def get_machine_id(self) -> str:
         """生成机器硬件指纹"""
         if self._machine_id:
             return self._machine_id
         try:
-            core_info = []
+            candidates = self._build_machine_id_candidates()
-            aux_info = []
+            if not candidates:
-            try:
+                raise RuntimeError("无法生成机器指纹")
-                if platform.system() == "Windows":
+            self._machine_id_candidates = candidates
-                    result = subprocess.run(['wmic', 'cpu', 'get', 'ProcessorId', '/value'], capture_output=True, text=True, timeout=10)
+            self._machine_id = candidates[0]
-                    for line in result.stdout.split('\n'):
-                        if 'ProcessorId=' in line:
-                            cpu_id = line.split('=')[1].strip()
-                            if cpu_id:
-                                core_info.append(f"CPU:{cpu_id}")
-                                break
-            except Exception as e:
-                logger.warning(f"获取CPU信息失败: {e}")
-            try:
-                if platform.system() == "Windows":
-                    result = subprocess.run(['wmic', 'baseboard', 'get', 'SerialNumber', '/value'], capture_output=True, text=True, timeout=10)
-                    for line in result.stdout.split('\n'):
-                        if 'SerialNumber=' in line:
-                            board_serial = line.split('=')[1].strip()
-                            if board_serial and board_serial != "To be filled by O.E.M.":
-                                core_info.append(f"BOARD:{board_serial}")
-                                break
-            except Exception as e:
-                logger.warning(f"获取主板信息失败: {e}")
-            try:
-                if platform.system() == "Windows":
-                    # 获取磁盘信息并过滤掉USB/可移动介质，收集所有内部磁盘序列号
-                    result = subprocess.run(
-                        ['wmic', 'path', 'Win32_DiskDrive', 'get', 'SerialNumber,InterfaceType,PNPDeviceID,MediaType', '/value'],
-                        capture_output=True, text=True, timeout=10
-                    )
-                    block = {}
-                    for line in result.stdout.split('\n'):
-                        line = line.strip()
-                        if not line:
-                            # 结束一个块
-                            serial = (block.get('SerialNumber') or '').strip()
-                            iface = (block.get('InterfaceType') or '').strip().upper()
-                            pnp = (block.get('PNPDeviceID') or '').strip().upper()
-                            media = (block.get('MediaType') or '').strip().upper()
-                            if serial and iface != 'USB' and not pnp.startswith('USBSTOR') and 'REMOVABLE' not in media:
-                                core_info.append(f"DISK:{serial}")
-                            block = {}
-                            continue
-                        if '=' in line:
-                            k, v = line.split('=', 1)
-                            block[k] = v
-                    # 处理最后一个块
-                    if block:
-                        serial = (block.get('SerialNumber') or '').strip()
-                        iface = (block.get('InterfaceType') or '').strip().upper()
-                        pnp = (block.get('PNPDeviceID') or '').strip().upper()
-                        media = (block.get('MediaType') or '').strip().upper()
-                        if serial and iface != 'USB' and not pnp.startswith('USBSTOR') and 'REMOVABLE' not in media:
-                            core_info.append(f"DISK:{serial}")
-            except Exception as e:
-                logger.warning(f"获取磁盘信息失败: {e}")
-            try:
-                import uuid
-                mac = ':'.join(['{:02x}'.format((uuid.getnode() >> elements) & 0xff) for elements in range(0, 2 * 6, 2)][::-1])
-                aux_info.append(f"MAC:{mac}")
-            except Exception as e:
-                logger.warning(f"获取MAC地址失败: {e}")
-            aux_info.append(f"OS:{platform.system()}")
-            aux_info.append(f"MACHINE:{platform.machine()}")
-            if len(core_info) < 1:
-                core_info.append(f"NODE:{platform.node()}")
-                core_info.append(f"PROCESSOR:{platform.processor()}")
-            combined_info = "|".join(sorted(core_info))
-            machine_id = hashlib.sha256(combined_info.encode('utf-8')).hexdigest()[:16].upper()
-            self._machine_id = f"W10-{machine_id}"
             logger.info(f"生成机器指纹: {self._machine_id}")
             return self._machine_id
         except Exception as e:
@@ -137,7 +398,13 @@ class LicenseManager:
             fallback_info = f"{platform.system()}-{platform.node()}-{platform.machine()}"
             fallback_id = hashlib.md5(fallback_info.encode('utf-8')).hexdigest()[:12].upper()
             self._machine_id = f"FB-{fallback_id}"
+            self._machine_id_candidates = [self._machine_id]
             return self._machine_id
+
+    def get_machine_id_candidates(self) -> list:
+        if self._machine_id_candidates is None:
+            self.get_machine_id()
+        return list(self._machine_id_candidates or [])
     
     def load_license(self, license_path: str) -> Optional[Dict[str, Any]]:
         """加载授权文件"""
@@ -231,7 +498,13 @@ class LicenseManager:
             
             # 检查机器绑定
             license_machine_id = license_data.get('machine_id', '')
-            if license_machine_id != machine_id:
+            candidates = []
+            if machine_id:
+                candidates.append(machine_id)
+            for mid in self.get_machine_id_candidates():
+                if mid not in candidates:
+                    candidates.append(mid)
+            if license_machine_id not in candidates:
                 return False, f"授权文件与当前机器不匹配 (当前: {machine_id}, 授权: {license_machine_id})"
             
             # 检查有效期
@@ -268,19 +541,8 @@ class LicenseManager:
             # 获取配置
             if not self.config_manager:
                 return LicenseStatus(valid=False, message="配置管理器未初始化")
-            
+
-            license_path = self.config_manager.get_config_value('LICENSE', 'path', 'data/license.json')
+            license_path, public_key_path, grace_days = self._resolve_license_paths()
-            public_key_path = self.config_manager.get_config_value('LICENSE', 'public_key', 'backend/license_pub.pem')
-            grace_days = int(self.config_manager.get_config_value('LICENSE', 'grace_days', '3'))
-            
-            # 转换为绝对路径
-            if not os.path.isabs(license_path):
-                base_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))  # backend目录
-                license_path = os.path.join(base_dir, license_path)
-            
-            if not os.path.isabs(public_key_path):
-                base_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))  # backend目录
-                public_key_path = os.path.join(base_dir, public_key_path)
             
             # 获取机器指纹
             machine_id = self.get_machine_id()
@@ -308,6 +570,8 @@ class LicenseManager:
                 self._license_cache = status
                 self._cache_timestamp = datetime.now().timestamp()
                 return status
+
+            self._mirror_license_assets(license_path=license_path, public_key_path=public_key_path)
             
             # 检查有效性
             is_valid, message = self.check_validity(license_data, machine_id, grace_days)
@@ -362,14 +626,7 @@ class LicenseManager:
             if not self.config_manager:
                 return False, "配置管理器未初始化"
 
-            # 解析公钥路径与宽限期
+            _, public_key_path, grace_days = self._resolve_license_paths()
-            public_key_path = self.config_manager.get_config_value('LICENSE', 'public_key', 'backend/license_pub.pem')
-            grace_days = int(self.config_manager.get_config_value('LICENSE', 'grace_days', '3'))
-
-            # 转换为绝对路径（相对backend目录）
-            if not os.path.isabs(public_key_path):
-                base_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
-                public_key_path = os.path.join(base_dir, public_key_path)
 
             if not os.path.exists(license_path):
                 return False, f"授权文件不存在: {license_path}"

backend/main.py

@@ -10,6 +10,7 @@ import sys
 import json
 import time
 import threading
+import shutil
 from datetime import datetime
 from flask import Flask, jsonify
 from flask import request as flask_request
@@ -377,7 +378,11 @@ class AppServer:
                         'success': False,
                         'error': '授权管理器未初始化'
                     }), 500
-                
+
+                if self.license_manager:
+                    self.license_status = self.license_manager.get_license_status(force_reload=True)
+                    self.app.license_status = self.license_status
+
                 return jsonify({
                     'success': True,
                     'data': {
@@ -548,22 +553,14 @@ class AppServer:
                     
                     if is_valid:
                         # 覆盖系统授权文件为上传的文件
-                        try:
+                        ok, result = self.license_manager.install_license_file(temp_path)
-                            license_path_cfg = self.config_manager.get_config_value('LICENSE', 'path', 'data/license.json') if self.config_manager else 'data/license.json'
+                        if not ok:
-                            # 解析目标路径为绝对路径
+                            self.logger.error(f'保存授权文件失败: {result}')
-                            if not os.path.isabs(license_path_cfg):
+                            return jsonify({'success': False, 'error': f'保存授权文件失败: {result}'}), 500
-                                base_dir = os.path.dirname(os.path.abspath(__file__))
-                                license_path_cfg = os.path.join(base_dir, license_path_cfg)
-                            os.makedirs(os.path.dirname(license_path_cfg), exist_ok=True)
-                            # 移动/覆盖授权文件
-                            import shutil
-                            shutil.copyfile(temp_path, license_path_cfg)
-                        except Exception as e:
-                            self.logger.error(f'保存授权文件失败: {e}')
-                            return jsonify({'success': False, 'error': f'保存授权文件失败: {str(e)}'}), 500
 
                         # 更新授权状态（强制刷新）
                         self.license_status = self.license_manager.get_license_status(force_reload=True)
+                        self.app.license_status = self.license_status
                         
                         return jsonify({
                             'success': True,
@@ -631,8 +628,11 @@ class AppServer:
                                 return jsonify({'success': False, 'error': '压缩包包含非法路径'}), 400
                         zip_ref.extractall(target_dir)
 
+                    self.license_manager.mirror_license_dir(target_dir)
+
                     # 刷新授权
                     self.license_status = self.license_manager.get_license_status(force_reload=True)
+                    self.app.license_status = self.license_status
 
                     return jsonify({
                         'success': True,
@@ -1448,6 +1448,30 @@ class AppServer:
                 try:
                     # 使用新的ffmpeg录制方法
                     recording_response = self.recording_manager.start_recording_ffmpeg(session_id, patient_id, screen_location)
+
+                    base_info = None
+                    try:
+                        base_info = self.recording_manager.get_active_video_base(session_id)
+                    except Exception:
+                        base_info = None
+
+                    if base_info and base_info.get('base_path'):
+                        base_path = base_info.get('base_path')
+                        try:
+                            cam1 = self.device_coordinator.devices.get('camera1') if self.device_coordinator and hasattr(self.device_coordinator, 'devices') else None
+                            if cam1 and getattr(cam1, 'is_streaming', False):
+                                cam1_frames_dir = os.path.join(base_path, 'camera1_frames')
+                                cam1.start_jpeg_recording(session_id=session_id, frames_dir=cam1_frames_dir)
+                        except Exception as e:
+                            self.logger.error(f'启动camera1 JPEG录制失败: {e}')
+
+                        try:
+                            cam2 = self.device_coordinator.devices.get('camera2') if self.device_coordinator and hasattr(self.device_coordinator, 'devices') else None
+                            if cam2 and getattr(cam2, 'is_streaming', False):
+                                cam2_frames_dir = os.path.join(base_path, 'camera2_frames')
+                                cam2.start_jpeg_recording(session_id=session_id, frames_dir=cam2_frames_dir)
+                        except Exception as e:
+                            self.logger.error(f'启动camera2 JPEG录制失败: {e}')
                     
                     # 处理录制管理器返回的数据库更新信息
                     if recording_response and recording_response.get('success') and 'database_updates' in recording_response:
@@ -1456,7 +1480,10 @@ class AppServer:
                             # 保存检测视频记录（映射到 detection_video 表字段）
                             video_paths = db_updates.get('video_paths', {})
                             video_record = {
-                                'screen_video_path': video_paths.get('screen_video_path')                               
+                                'screen_video_path': video_paths.get('screen_video_path'),
+                                'body_video_path': None,
+                                'foot_video1_path': None,
+                                'foot_video2_path': None
                             }
        
                             try:
@@ -1495,6 +1522,76 @@ class AppServer:
                 except Exception as rec_e:
                     self.logger.error(f'停止同步录制失败: {rec_e}', exc_info=True)                   
                     raise                
+
+                base_info = None
+                try:
+                    base_info = self.recording_manager.get_active_video_base(session_id)
+                except Exception:
+                    base_info = None
+
+                if base_info and base_info.get('base_path') and base_info.get('file_dir'):
+                    base_path = base_info.get('base_path')
+                    file_dir = base_info.get('file_dir')
+
+                    cam1 = self.device_coordinator.devices.get('camera1') if self.device_coordinator and hasattr(self.device_coordinator, 'devices') else None
+                    cam2 = self.device_coordinator.devices.get('camera2') if self.device_coordinator and hasattr(self.device_coordinator, 'devices') else None
+
+                    if cam1:
+                        try:
+                            cam1_stop = cam1.stop_jpeg_recording(session_id=session_id)
+                            cam1_frames_dir = cam1_stop.get('frames_dir')
+                            cam1_fps = int(cam1_stop.get('fps') or 10)
+                            if cam1_frames_dir and os.path.isdir(cam1_frames_dir):
+                                out1 = os.path.join(base_path, 'foot1.mp4')
+                                rel1 = os.path.relpath(out1, file_dir).replace('\\', '/')
+                                def _done1(code: int):
+                                    if code == 0:
+                                        try:
+                                            self.db_manager.update_detection_video_latest(session_id, {'foot_video1_path': rel1})
+                                        except Exception as e:
+                                            self.logger.error(f'更新foot_video1失败: {e}')
+                                        try:
+                                            shutil.rmtree(cam1_frames_dir, ignore_errors=True)
+                                        except Exception as e:
+                                            self.logger.error(f'删除camera1_frames失败: {e}')
+                                self.recording_manager.transcode_jpeg_sequence_async(
+                                    name=f'{session_id}-camera1',
+                                    frames_dir=cam1_frames_dir,
+                                    output_mp4_path=out1,
+                                    fps=cam1_fps,
+                                    on_done=_done1
+                                )
+                        except Exception as e:
+                            self.logger.error(f'停止/转码camera1录制失败: {e}')
+
+                    if cam2:
+                        try:
+                            cam2_stop = cam2.stop_jpeg_recording(session_id=session_id)
+                            cam2_frames_dir = cam2_stop.get('frames_dir')
+                            cam2_fps = int(cam2_stop.get('fps') or 10)
+                            if cam2_frames_dir and os.path.isdir(cam2_frames_dir):
+                                out2 = os.path.join(base_path, 'foot2.mp4')
+                                rel2 = os.path.relpath(out2, file_dir).replace('\\', '/')
+                                def _done2(code: int):
+                                    if code == 0:
+                                        try:
+                                            self.db_manager.update_detection_video_latest(session_id, {'foot_video2_path': rel2})
+                                        except Exception as e:
+                                            self.logger.error(f'更新foot_video2失败: {e}')
+                                        try:
+                                            shutil.rmtree(cam2_frames_dir, ignore_errors=True)
+                                        except Exception as e:
+                                            self.logger.error(f'删除camera2_frames失败: {e}')
+                                self.recording_manager.transcode_jpeg_sequence_async(
+                                    name=f'{session_id}-camera2',
+                                    frames_dir=cam2_frames_dir,
+                                    output_mp4_path=out2,
+                                    fps=cam2_fps,
+                                    on_done=_done2
+                                )
+                        except Exception as e:
+                            self.logger.error(f'停止/转码camera2录制失败: {e}')
+
                 return jsonify({'success': True,'msg': '停止录制成功'})    
             except Exception as e:
                 self.logger.error(f'停止检测失败: {e}', exc_info=True)

backend/tests/test_license_manager_unit.py

@@ -0,0 +1,64 @@
+import os
+from datetime import datetime, timedelta, timezone
+
+import pytest
+
+
+class DummyConfigManager:
+    def __init__(self, values):
+        self._values = values
+
+    def get_config_value(self, section, key, fallback=None):
+        return self._values.get((section, key), fallback)
+
+
+def test_check_validity_accepts_candidate_machine_id(monkeypatch):
+    from devices.utils.license_manager import LicenseManager
+
+    lm = LicenseManager(config_manager=DummyConfigManager({}))
+    monkeypatch.setattr(lm, "get_machine_id_candidates", lambda: ["MID-PRIMARY", "MID-ALT"])
+
+    license_data = {
+        "product": "BodyBalanceEvaluation",
+        "license_id": "L1",
+        "license_type": "full",
+        "machine_id": "MID-ALT",
+        "issued_at": datetime.now(timezone.utc).isoformat(),
+        "expires_at": (datetime.now(timezone.utc) + timedelta(days=1)).isoformat().replace("+00:00", "Z"),
+        "signature": "x",
+        "features": {"export": True},
+    }
+
+    ok, msg = lm.check_validity(license_data, machine_id="MID-PRIMARY", grace_days=0)
+    assert ok is True, msg
+
+
+def test_resolve_license_paths_falls_back_to_persistent(monkeypatch, tmp_path):
+    from devices.utils.license_manager import LicenseManager
+
+    programdata = tmp_path / "programdata"
+    persistent_dir = programdata / "BodyCheck" / "license"
+    persistent_dir.mkdir(parents=True)
+    (persistent_dir / "license.json").write_text('{"a":1}', encoding="utf-8")
+    (persistent_dir / "license_public_key.pem").write_text("PUB", encoding="utf-8")
+
+    cfg_dir = tmp_path / "cfg"
+    cfg_license_path = str(cfg_dir / "license.json")
+    cfg_pub_path = str(cfg_dir / "license_public_key.pem")
+
+    cfg = DummyConfigManager(
+        {
+            ("LICENSE", "path"): cfg_license_path,
+            ("LICENSE", "public_key"): cfg_pub_path,
+            ("LICENSE", "grace_days"): "3",
+        }
+    )
+    lm = LicenseManager(config_manager=cfg)
+
+    monkeypatch.setenv("PROGRAMDATA", str(programdata))
+    monkeypatch.setattr("platform.system", lambda: "Windows")
+
+    license_path, pub_path, grace_days = lm._resolve_license_paths()
+    assert license_path == str(persistent_dir / "license.json")
+    assert pub_path == str(persistent_dir / "license_public_key.pem")
+    assert grace_days == 3

frontend/src/renderer/main/main.js

@@ -3,7 +3,7 @@ const path = require('path');
 const http = require('http');
 const fs = require('fs');
 const url = require('url');
-const { spawn } = require('child_process');
+const { spawn, exec, execSync } = require('child_process');
 let mainWindow;
 let localServer;
 let backendProcess;
@@ -11,6 +11,24 @@ let splashWindow;
 // app.disableHardwareAcceleration();
 app.disableDomainBlockingFor3DAPIs();
 console.log('Electron version:', process.versions.electron);
+
+const gotSingleInstanceLock = app.requestSingleInstanceLock();
+if (!gotSingleInstanceLock) {
+  app.quit();
+} else {
+  app.on('second-instance', () => {
+    if (mainWindow) {
+      if (mainWindow.isMinimized()) {
+        mainWindow.restore();
+      }
+      mainWindow.focus();
+      return;
+    }
+    if (app.isReady()) {
+      createWindow();
+    }
+  });
+}
 ipcMain.handle('generate-report-pdf', async (event, payload) => {
   const win = BrowserWindow.fromWebContents(event.sender);
   if (!win) throw new Error('窗口未找到');
@@ -134,6 +152,21 @@ ipcMain.handle('generate-report-pdf', async (event, payload) => {
 });
 
 function startBackendService() {
+  if (backendProcess) {
+    console.log('Backend service already started (tracked).');
+    return;
+  }
+
+  try {
+    const tasklistOut = execSync('tasklist /FI "IMAGENAME eq BodyBalanceBackend.exe" /NH', { windowsHide: true }).toString();
+    if (tasklistOut && tasklistOut.toLowerCase().includes('bodybalancebackend.exe')) {
+      console.log('Backend service already running (tasklist). Skip spawning a new instance.');
+      return;
+    }
+  } catch (e) {
+    console.log('Backend process detection failed, continue to spawn:', e && e.message ? e.message : e);
+  }
+
   // 在打包后的应用中，使用process.resourcesPath获取resources目录
   const resourcesPath = process.resourcesPath || path.join(__dirname, '../..');
   const backendPath = path.join(resourcesPath, 'backend/BodyBalanceBackend/BodyBalanceBackend.exe');
@@ -199,7 +232,6 @@ function stopBackendService() {
   
   // 强制杀死所有BodyBalanceBackend.exe进程
   try {
-    const { exec } = require('child_process');
     exec('taskkill /f /im BodyBalanceBackend.exe', (error, stdout, stderr) => {
       if (error) {
         // 如果没有找到进程，taskkill会返回错误，这是正常的
@@ -300,6 +332,11 @@ function createWindow() {
 }
 
 function startLocalServer(callback) {
+  if (localServer) {
+    console.log('Local server already started on http://localhost:3000');
+    callback();
+    return;
+  }
   const staticPath = path.join(__dirname, '../dist/');
   
   localServer = http.createServer((req, res) => {
@@ -360,26 +397,28 @@ function startLocalServer(callback) {
 // 应用事件处理
 // 关闭硬件加速以规避 GPU 进程异常导致的闪烁
 // app.disableHardwareAcceleration();
-app.whenReady().then(createWindow);
+if (gotSingleInstanceLock) {
+  app.whenReady().then(createWindow);
 
-app.on('window-all-closed', () => {
+  app.on('window-all-closed', () => {
-  if (process.platform !== 'darwin') {
+    if (process.platform !== 'darwin') {
-    if (localServer) {
+      if (localServer) {
-      localServer.close();
+        localServer.close();
+      }
+       // 关闭后端服务
+      stopBackendService();
+      app.quit();
     }
-     // 关闭后端服务
+  });
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createWindow();
+    }
+  });
+
+  // 应用退出前清理资源
+  app.on('before-quit', () => {
     stopBackendService();
-    app.quit();
+  });
-  }
+}
-});
-
-app.on('activate', () => {
-  if (BrowserWindow.getAllWindows().length === 0) {
-    createWindow();
-  }
-});
-
-// 应用退出前清理资源
-app.on('before-quit', () => {
-  stopBackendService();
-});