修改UCD连接需要重启错误

app/device/connection.py

@@ -78,8 +78,27 @@ class ConnectionController:
 
     # -- UCD 连接 ------------------------------------------------
 
-    def connect_ucd(self, display: str) -> bool:
+    def _refresh_ucd_selection(self, display: str) -> tuple[list[str], str | None]:
+        """Rescan devices and return (device list, valid selection or None)."""
+        ucd_list = self.list_ucd_devices()
+        if display in ucd_list:
+            return ucd_list, display
+        return ucd_list, (ucd_list[0] if ucd_list else None)
+
+    def _sync_ucd_combo(self, ucd_list: list[str], selected: str) -> None:
+        app = self._app
+        app.ucd_list_combo.config(values=ucd_list)
+        app.ucd_list_var.set(selected)
+        app.update_config()
+
+    def connect_ucd(self, display: str, *, rescan: bool = True) -> bool:
         """打开指定 UCD 设备。成功返回 True。"""
+        if rescan:
+            _, display = self._refresh_ucd_selection(display)
+        if not display:
+            self._log("未检测到 UCD 设备，请确认电源已打开后重试", level="error")
+            return False
+
         if self._device.state.name != "CLOSED":
             try:
                 self._device.close()
@@ -158,7 +177,11 @@ class ConnectionController:
 
         def worker():
             try:
-                ucd_ok = self.connect_ucd(app.ucd_list_var.get())
+                ucd_list, selected = self._refresh_ucd_selection(app.ucd_list_var.get())
+                app._dispatch_ui(self._sync_ucd_combo, ucd_list, selected or "")
+                ucd_ok = False
+                if selected:
+                    ucd_ok = self.connect_ucd(selected, rescan=False)
                 app._dispatch_ui(
                     app.update_connection_indicator,
                     app.ucd_status_indicator, ucd_ok,
@@ -185,7 +208,19 @@ class ConnectionController:
 
         def worker():
             try:
-                ucd_ok = self.connect_ucd(app.ucd_list_var.get())
+                ucd_list, selected = self._refresh_ucd_selection(app.ucd_list_var.get())
+                app._dispatch_ui(self._sync_ucd_combo, ucd_list, selected or "")
+                if not selected:
+                    app._dispatch_ui(
+                        app.update_connection_indicator,
+                        app.ucd_status_indicator,
+                        False,
+                    )
+                    app._dispatch_ui(app.status_var.set, "未检测到 UCD 设备")
+                    app._dispatch_ui(self._enable_widgets)
+                    return
+
+                ucd_ok = self.connect_ucd(selected, rescan=False)
                 app._dispatch_ui(
                     app.update_connection_indicator,
                     app.ucd_status_indicator,

app/ucd/device.py

@@ -111,6 +111,12 @@ class _UcdSdkBackend:
 
     def search_device(self):
         """搜索可用设备"""
+        self._ensure_tsi_lib()
+        try:
+            self.lUniTAP.rescan_devices()
+        except Exception:
+            log.exception("UcdSdk.search_device rescan failed; reinitializing TsiLib")
+            self._reinit_tsi_lib()
         available_devices = self.lUniTAP.get_list_of_available_devices()
         return available_devices if available_devices else []
 
@@ -122,6 +128,13 @@ class _UcdSdkBackend:
             if self.dev is not None or self.status:
                 self._force_cleanup()
 
+            self._ensure_tsi_lib()
+            try:
+                self.lUniTAP.rescan_devices()
+            except Exception:
+                log.exception("UcdSdk.open rescan failed; reinitializing TsiLib")
+                self._reinit_tsi_lib()
+
             device_id = int(device_name.split(":")[0])
             temp_dev = self.lUniTAP.open(device_id)
 
@@ -144,6 +157,7 @@ class _UcdSdkBackend:
 
         except Exception as e:
             self._force_cleanup()
+            self._reinit_tsi_lib()
             return False
 
     def close(self):
@@ -157,30 +171,29 @@ class _UcdSdkBackend:
                 self._close_device_object(self.dev)
 
             self._reset_state()
-            self.lUniTAP = None
-
-            for i in range(3):
-                gc.collect()
-
-            time.sleep(2.0)
-
-            self.lUniTAP = UniTAP.TsiLib()
-
+            self._reinit_tsi_lib()
             return True
 
         except Exception as e:
             self._reset_state()
-
             try:
-                self.lUniTAP = None
-                gc.collect()
-                time.sleep(2.0)
-                self.lUniTAP = UniTAP.TsiLib()
-            except Exception as init_error:
+                self._reinit_tsi_lib()
+            except Exception:
                 pass
-
             return False
 
+    def _ensure_tsi_lib(self) -> None:
+        if self.lUniTAP is None:
+            self.lUniTAP = UniTAP.TsiLib()
+
+    def _reinit_tsi_lib(self) -> None:
+        """Destroy and recreate TsiLib so the native driver rescans USB devices."""
+        self.lUniTAP = None
+        for _ in range(3):
+            gc.collect()
+        time.sleep(2.0)
+        self.lUniTAP = UniTAP.TsiLib()
+
     def _reset_state(self):
         """重置所有运行时状态（不关闭设备句柄）"""
         self.dev = None