尝试解决划词翻译和保存错题时摄像头不打开的问题，但失败了，可能是我机器的原因，我放弃了。

Let's call it a day!

Author: Micraow

CV/cvworker.py

@@ -28,7 +28,10 @@ def __init__(self):
 
     def takePic(self):
         self.cap = cv2.VideoCapture(0)  # 参数为0时调用本地摄像头；参数为1时调用外接摄像头
+        if not self.cap.isOpened():
+            raise Exception("无法打开摄像头")
         self.cap.release()  # workaround for cv2.VideoCapture(0) not working after first call
+
         self.cap = cv2.VideoCapture(0)
         ret, frame = self.cap.read()  # ret(bool)有无读取到图片
         cv2.imwrite("/tmp/prism/"+str(self.index)+".jpg", frame)

app/backend.py

@@ -118,9 +118,7 @@ def photoTranslate(self):
             return results
 
     def liveTranslate(self, var=None):
-        back = Thread(target=self._liveTranslate,args=(var,))
-        back.start()
-        back.join()
+        self._liveTranslate()
         res = self.result
         return res
 

web/back/api.py

@@ -70,14 +70,15 @@ def call_live_translate():
     global res
     global is_live_translate_running
     res = Backend.liveTranslate()
-    db = get_db()
-    try:
-        # 将实时翻译结果保存到数据库
-        db.execute("INSERT INTO PRISM (ID, TYPE, ORI, RES) VALUES (?, ?, ?, ?)", 
-                   [now_ID, "LIVE", res.get("origin"), str(res)])
-        db.commit()
-    except Exception as e:
-        print(f"Error saving live translation: {e}")
+    with app.app_context():
+        db = get_db()
+        try:
+            # 将实时翻译结果保存到数据库
+            db.execute("INSERT INTO PRISM (ID, TYPE, ORI, RES) VALUES (?, ?, ?, ?)", 
+                       [now_ID, "LIVE", res.get("origin"), str(res)])
+            db.commit()
+        except Exception as e:
+            print(f"Error saving live translation: {e}")
     is_live_translate_running = False  # 实时翻译结束后，重置标志位
 
 @app.route('/livetranslate/end', methods=['GET'])