diff --git a/src/client/client.cpp b/src/client/client.cpp
index 547c10a1..7e4b4096 100644
--- a/src/client/client.cpp
+++ b/src/client/client.cpp
@@ -119,13 +119,13 @@ void Client::setLoginInfo(const QString &username, const QString &password) {
 
 void Client::replyToServer(const QString &command, const QString &jsonData) {
   int type = Router::TYPE_REPLY | Router::SRC_CLIENT | Router::DEST_SERVER;
-  router->reply(type, command, jsonData);
+  router->reply(type, command.toUtf8(), jsonData.toUtf8());
 }
 
 void Client::notifyServer(const QString &command, const QString &jsonData) {
   int type =
       Router::TYPE_NOTIFICATION | Router::SRC_CLIENT | Router::DEST_SERVER;
-  router->notify(type, command, jsonData);
+  router->notify(type, command.toUtf8(), jsonData.toUtf8());
 }
 
 void Client::callLua(const QString& command, const QString& json_data, bool isRequest) {
diff --git a/src/core/c-wrapper.h b/src/core/c-wrapper.h
index aa3cdc5f..64b74f8d 100644
--- a/src/core/c-wrapper.h
+++ b/src/core/c-wrapper.h
@@ -35,7 +35,8 @@ class Lua {
 
 class Sqlite3 {
 public:
-  Sqlite3(const QString &filename = "./server/users.db", const QString &initSql = "./server/init.sql");
+  Sqlite3(const QString &filename = QStringLiteral("./server/users.db"),
+          const QString &initSql = QStringLiteral("./server/init.sql"));
   ~Sqlite3();
 
   static bool checkString(const QString &str);
diff --git a/src/core/packman.cpp b/src/core/packman.cpp
index 7359f2c4..f7bd6e4c 100644
--- a/src/core/packman.cpp
+++ b/src/core/packman.cpp
@@ -277,7 +277,7 @@ int PackMan::clone(const QString &u) {
   QString fileName = QUrl(url).fileName();
   if (fileName.endsWith(".git"))
     fileName.chop(4);
-  fileName = "packages/" + fileName;
+  fileName = QStringLiteral("packages/") + fileName;
 
   git_clone_options opt = GIT_CLONE_OPTIONS_INIT;
   opt.fetch_opts.callbacks.transfer_progress = transfer_progress_cb;
diff --git a/src/freekill.cpp b/src/freekill.cpp
index 597cb17f..2fc44e1c 100644
--- a/src/freekill.cpp
+++ b/src/freekill.cpp
@@ -352,15 +352,15 @@ int freekill_main(int argc, char *argv[]) {
 
   QString system;
 #if defined(Q_OS_ANDROID)
-  system = "Android";
+  system = QStringLiteral("Android");
 #elif defined(Q_OS_WIN32)
   qputenv("QT_MEDIA_BACKEND", "windows");
-  system = "Win";
+  system = QStringLiteral("Win");
   ::system("chcp 65001");
 #elif defined(Q_OS_LINUX)
-  system = "Linux";
+  system = QStringLiteral("Linux");
 #else
-  system = "Other";
+  system = QStringLiteral("Other");
 #endif
   root->setContextProperty("OS", system);
 
diff --git a/src/network/client_socket.cpp b/src/network/client_socket.cpp
index 5c18cacf..89fef47d 100644
--- a/src/network/client_socket.cpp
+++ b/src/network/client_socket.cpp
@@ -57,7 +57,7 @@ void ClientSocket::send(const QByteArray &msg) {
   QByteArray _msg;
   if (msg.length() >= 1024) {
     auto comp = qCompress(msg);
-    _msg = "Compressed" + comp.toBase64();
+    _msg = QByteArrayLiteral("Compressed") + comp.toBase64();
     _msg = aesEnc(_msg) + "\n";
   } else {
     _msg = aesEnc(msg) + "\n";
diff --git a/src/network/client_socket.h b/src/network/client_socket.h
index f084226f..155423bc 100644
--- a/src/network/client_socket.h
+++ b/src/network/client_socket.h
@@ -43,7 +43,7 @@ class ClientSocket : public QObject {
   ClientSocket(QTcpSocket *socket);
 
   /// 客户端使用，用于连接到远程服务器
-  void connectToHost(const QString &address = "127.0.0.1", ushort port = 9527u);
+  void connectToHost(const QString &address = QStringLiteral("127.0.0.1"), ushort port = 9527u);
   /// 双端都可使用。禁用加密传输并断开TCP连接。
   void disconnectFromHost();
   /// 设置AES密钥，同时启用加密传输。
diff --git a/src/network/router.cpp b/src/network/router.cpp
index 970d904f..9b57b8ee 100644
--- a/src/network/router.cpp
+++ b/src/network/router.cpp
@@ -48,7 +48,7 @@ void Router::setReplyReadySemaphore(QSemaphore *semaphore) {
   extraReplyReadySemaphore = semaphore;
 }
 
-void Router::request(int type, const QString &command, const QString &jsonData,
+void Router::request(int type, const QByteArray &command, const QByteArray &jsonData,
                      int timeout, qint64 timestamp) {
   // In case a request is called without a following waitForReply call
   if (replyReadySemaphore.available() > 0)
@@ -61,36 +61,36 @@ void Router::request(int type, const QString &command, const QString &jsonData,
   expectedReplyId = requestId;
   replyTimeout = timeout;
   requestStartTime = QDateTime::currentDateTime();
-  m_reply = "__notready";
+  m_reply = QStringLiteral("__notready");
   replyMutex.unlock();
 
   QJsonArray body;
   body << requestId;
   body << type;
-  body << command;
-  body << jsonData;
+  body << command.constData();
+  body << jsonData.constData();
   body << timeout;
   body << (timestamp <= 0 ? requestStartTime.toMSecsSinceEpoch() : timestamp);
 
   emit messageReady(JsonArray2Bytes(body));
 }
 
-void Router::reply(int type, const QString &command, const QString &jsonData) {
+void Router::reply(int type, const QByteArray &command, const QByteArray &jsonData) {
   QJsonArray body;
   body << this->requestId;
   body << type;
-  body << command;
-  body << jsonData;
+  body << command.constData();
+  body << jsonData.constData();
 
   emit messageReady(JsonArray2Bytes(body));
 }
 
-void Router::notify(int type, const QString &command, const QString &jsonData) {
+void Router::notify(int type, const QByteArray &command, const QByteArray &jsonData) {
   QJsonArray body;
   body << -2; // requestId = -2 mean this is for notification
   body << type;
-  body << command;
-  body << jsonData;
+  body << command.constData();
+  body << jsonData.constData();
 
   emit messageReady(JsonArray2Bytes(body));
 }
diff --git a/src/network/router.h b/src/network/router.h
index 3992aab6..e2faa91c 100644
--- a/src/network/router.h
+++ b/src/network/router.h
@@ -45,10 +45,10 @@ class Router : public QObject {
 
   void setReplyReadySemaphore(QSemaphore *semaphore);
 
-  void request(int type, const QString &command,
-              const QString &jsonData, int timeout, qint64 timestamp = -1);
-  void reply(int type, const QString &command, const QString &jsonData);
-  void notify(int type, const QString &command, const QString &jsonData);
+  void request(int type, const QByteArray &command,
+              const QByteArray &jsonData, int timeout, qint64 timestamp = -1);
+  void reply(int type, const QByteArray &command, const QByteArray &jsonData);
+  void notify(int type, const QByteArray &command, const QByteArray &jsonData);
 
   int getTimeout() const;
 
@@ -62,7 +62,6 @@ class Router : public QObject {
 
 signals:
   void messageReady(const QByteArray &message);
-  void unknownPacket(const QByteArray &packet);
   void replyReady();
 
   void notification_got(const QString &command, const QString &jsonData);
diff --git a/src/server/auth.cpp b/src/server/auth.cpp
index 9df6e7e4..49aae906 100644
--- a/src/server/auth.cpp
+++ b/src/server/auth.cpp
@@ -61,7 +61,7 @@ bool AuthManager::checkClientVersion(ClientSocket *client, const QString &cver)
                       .arg(FK_VERSION, "1");
     }
 
-    server->sendEarlyPacket(client, "ErrorDlg", errmsg);
+    server->sendEarlyPacket(client, "ErrorDlg", errmsg.toUtf8());
     client->disconnectFromHost();
     return false;
   }
@@ -107,7 +107,7 @@ QMap<QString, QString> AuthManager::checkPassword(ClientSocket *client, const QS
 
   auto server = qobject_cast<Server *>(parent());
   bool passed = false;
-  QString error_msg;
+  const char *error_msg = nullptr;
   QMap<QString, QString> obj;
   int id;
   QByteArray salt;
diff --git a/src/server/lobby.cpp b/src/server/lobby.cpp
index 919019db..0560ebce 100644
--- a/src/server/lobby.cpp
+++ b/src/server/lobby.cpp
@@ -40,7 +40,7 @@ void Lobby::updateAvatar(ServerPlayer *sender, const QString &jsonData) {
       .arg(sender->getId());
     ServerInstance->getDatabase()->exec(sql);
     sender->setAvatar(avatar);
-    sender->doNotify("UpdateAvatar", avatar);
+    sender->doNotify("UpdateAvatar", avatar.toUtf8());
   }
 }
 
@@ -90,7 +90,7 @@ void Lobby::getRoomConfig(ServerPlayer *sender, const QString &jsonData) {
   if (room) {
     auto settings = room->getSettings();
     // 手搓JSON数组 跳过编码解码
-    sender->doNotify("GetRoomConfig", QString("[%1,%2]").arg(roomId).arg(settings));
+    sender->doNotify("GetRoomConfig", QString("[%1,%2]").arg(roomId).arg(settings).toUtf8());
   } else {
     sender->doNotify("ErrorMsg", "no such room");
   }
diff --git a/src/server/room.cpp b/src/server/room.cpp
index b89b6eab..b69f98d2 100644
--- a/src/server/room.cpp
+++ b/src/server/room.cpp
@@ -43,6 +43,12 @@ Room::~Room() {
   if (gameStarted) {
     gameOver();
   }
+  for (auto p : players) {
+    if (p->getId() > 0) removePlayer(p);
+  }
+  for (auto p : observers) {
+    removeObserver(p);
+  }
 }
 
 int Room::getId() const { return id; }
@@ -99,7 +105,7 @@ void Room::addPlayer(ServerPlayer *player) {
     if (runned_players.contains(player->getId())) {
       player->doNotify("ErrorMsg", "Running away is shameful.");
     }
-    // 此时player仍在lobby中，别管就行了
+    // 此时phttps://github.com/fmanlou/qt6printerslayer仍在lobby中，别管就行了
     // emit playerRemoved(player);
     return;
   }
@@ -298,7 +304,7 @@ void Room::delay(int ms) {
 
 bool Room::isOutdated() {
   bool ret = md5 != server->getMd5();
-  if (ret) md5 = "";
+  if (ret) md5 = QStringLiteral("");
   return ret;
 }
 
@@ -542,14 +548,14 @@ void Room::manuallyStart() {
     for (auto i = ipList.cbegin(); i != ipList.cend(); i++) {
       if (i.value().length() <= 1) continue;
       auto warn = QString("*WARN* Same IP address: [%1]").arg(i.value().join(", "));
-      doBroadcastNotify(getPlayers(), "ServerMessage", warn);
+      doBroadcastNotify(getPlayers(), "ServerMessage", warn.toUtf8());
       qInfo("%s", warn.toUtf8().constData());
     }
 
     for (auto i = uuidList.cbegin(); i != uuidList.cend(); i++) {
       if (i.value().length() <= 1) continue;
       auto warn = QString("*WARN* Same device id: [%1]").arg(i.value().join(", "));
-      doBroadcastNotify(getPlayers(), "ServerMessage", warn);
+      doBroadcastNotify(getPlayers(), "ServerMessage", warn.toUtf8());
       qInfo("%s", warn.toUtf8().constData());
     }
 
diff --git a/src/server/roombase.cpp b/src/server/roombase.cpp
index fc257119..3d0b1135 100644
--- a/src/server/roombase.cpp
+++ b/src/server/roombase.cpp
@@ -26,7 +26,7 @@ ServerPlayer *RoomBase::findPlayer(int id) const {
 }
 
 void RoomBase::doBroadcastNotify(const QList<ServerPlayer *> targets,
-                             const QString &command, const QString &jsonData) {
+                             const QByteArray &command, const QByteArray &jsonData) {
   for (auto p : targets) {
     p->doNotify(command, jsonData);
   }
diff --git a/src/server/roombase.h b/src/server/roombase.h
index ef749949..b2c96501 100644
--- a/src/server/roombase.h
+++ b/src/server/roombase.h
@@ -13,7 +13,7 @@ class RoomBase : public QObject {
   ServerPlayer *findPlayer(int id) const;
 
   void doBroadcastNotify(const QList<ServerPlayer *> targets,
-                         const QString &command, const QString &jsonData);
+                         const QByteArray &command, const QByteArray &jsonData);
 
   void chat(ServerPlayer *sender, const QString &jsonData);
 
diff --git a/src/server/roomthread.cpp b/src/server/roomthread.cpp
index 8711ba03..e4e8feef 100644
--- a/src/server/roomthread.cpp
+++ b/src/server/roomthread.cpp
@@ -67,7 +67,7 @@ bool RoomThread::isOutdated() {
   if (ret) {
     // 让以后每次都outdate
     // 不然反复disable/enable的情况下会出乱子
-    md5 = "";
+    md5 = QStringLiteral("");
   }
   return ret;
 }
diff --git a/src/server/server.cpp b/src/server/server.cpp
index bc8c5d5a..f9c779c2 100644
--- a/src/server/server.cpp
+++ b/src/server/server.cpp
@@ -168,32 +168,32 @@ void Server::updateRoomList(ServerPlayer *teller) {
     arr.prepend(v);
   }
   auto jsonData = JsonArray2Bytes(arr);
-  teller->doNotify("UpdateRoomList", QString(jsonData));
+  teller->doNotify("UpdateRoomList", jsonData);
 }
 
 void Server::updateOnlineInfo() {
   lobby()->doBroadcastNotify(lobby()->getPlayers(), "UpdatePlayerNum",
-                             QString(JsonArray2Bytes(QJsonArray({
+                             JsonArray2Bytes(QJsonArray({
                                  lobby()->getPlayers().length(),
                                  this->players.count(),
-                             }))));
+                             })));
 }
 
 Sqlite3 *Server::getDatabase() { return db; }
 
-void Server::broadcast(const QString &command, const QString &jsonData) {
+void Server::broadcast(const QByteArray &command, const QByteArray &jsonData) {
   for (ServerPlayer *p : players.values()) {
     p->doNotify(command, jsonData);
   }
 }
 
-void Server::sendEarlyPacket(ClientSocket *client, const QString &type, const QString &msg) {
+void Server::sendEarlyPacket(ClientSocket *client, const QByteArray &type, const QByteArray &msg) {
   QJsonArray body;
   body << -2;
   body << (Router::TYPE_NOTIFICATION | Router::SRC_SERVER |
           Router::DEST_CLIENT);
-  body << type;
-  body << msg;
+  body << type.constData();
+  body << msg.constData();
   client->send(JsonArray2Bytes(body));
 }
 
@@ -222,7 +222,7 @@ void Server::processNewConnection(ClientSocket *client) {
   // check ban ip
   auto result = db->select(QString("SELECT * FROM banip WHERE ip='%1';").arg(addr));
 
-  auto errmsg = QString();
+  const char *errmsg = nullptr;
 
   if (!result.isEmpty()) {
     errmsg = "you have been banned!";
@@ -232,7 +232,7 @@ void Server::processNewConnection(ClientSocket *client) {
     errmsg = "server is full!";
   }
 
-  if (!errmsg.isEmpty()) {
+  if (errmsg) {
     sendEarlyPacket(client, "ErrorDlg", errmsg);
     qInfo() << "Refused banned IP:" << addr;
     client->disconnectFromHost();
@@ -243,7 +243,7 @@ void Server::processNewConnection(ClientSocket *client) {
           [client]() { qInfo() << client->peerAddress() << "disconnected"; });
 
   // network delay test
-  sendEarlyPacket(client, "NetworkDelayTest", auth->getPublicKey());
+  sendEarlyPacket(client, "NetworkDelayTest", auth->getPublicKey().toUtf8());
   // Note: the client should send a setup string next
   connect(client, &ClientSocket::message_got, this, &Server::processRequest);
   client->timerSignup.start(30000);
@@ -295,7 +295,7 @@ void Server::processRequest(const QByteArray &msg) {
   auto md5_str = arr[2].toString();
   if (md5 != md5_str) {
     sendEarlyPacket(client, "ErrorMsg", "MD5 check failed!");
-    sendEarlyPacket(client, "UpdatePackage", Pacman->getPackSummary());
+    sendEarlyPacket(client, "UpdatePackage", Pacman->getPackSummary().toUtf8());
     client->disconnectFromHost();
     return;
   }
@@ -333,7 +333,7 @@ void Server::processRequest(const QByteArray &msg) {
   player->setId(id);
   player->setUuid(uuid_str);
   if (players.count() <= 10) {
-    broadcast("ServerMessage", tr("%1 logged in").arg(player->getScreenName()));
+    broadcast("ServerMessage", tr("%1 logged in").arg(player->getScreenName()).toUtf8());
   }
   players.insert(player->getId(), player);
 
@@ -354,7 +354,7 @@ void Server::processRequest(const QByteArray &msg) {
 
 void Server::readConfig() {
   QFile file("freekill.server.config.json");
-  QByteArray json = "{}";
+  QByteArray json = QByteArrayLiteral("{}");
   if (file.open(QIODevice::ReadOnly)) {
     json = file.readAll();
   }
diff --git a/src/server/server.h b/src/server/server.h
index cd38a85a..bc18f2b9 100644
--- a/src/server/server.h
+++ b/src/server/server.h
@@ -61,7 +61,7 @@ class Server : public QObject {
     @param settings 表示JSON对象的字符串，用作房间配置
     */
   void createRoom(ServerPlayer *owner, const QString &name, int capacity,
-                  int timeout = 15, const QByteArray &settings = "{}");
+                  int timeout = 15, const QByteArray &settings = QByteArrayLiteral("{}"));
 
   void removeRoom(int id); /// 单纯从表中删除指针 内存由对应thread管理
 
@@ -78,8 +78,8 @@ class Server : public QObject {
 
   Sqlite3 *getDatabase();
 
-  void broadcast(const QString &command, const QString &jsonData);
-  void sendEarlyPacket(ClientSocket *client, const QString &type, const QString &msg);
+  void broadcast(const QByteArray &command, const QByteArray &jsonData);
+  void sendEarlyPacket(ClientSocket *client, const QByteArray &type, const QByteArray &msg);
   void setupPlayer(ServerPlayer *player, bool all_info = true);
   bool isListening;
 
diff --git a/src/server/serverplayer.cpp b/src/server/serverplayer.cpp
index ef1eaa33..58d4e73e 100644
--- a/src/server/serverplayer.cpp
+++ b/src/server/serverplayer.cpp
@@ -89,7 +89,7 @@ void ServerPlayer::setRoom(RoomBase *room) { this->room = room; }
 
 void ServerPlayer::speak(const QString &message) { ; }
 
-void ServerPlayer::doRequest(const QString &command, const QString &jsonData,
+void ServerPlayer::doRequest(const QByteArray &command, const QByteArray &jsonData,
                              int timeout, qint64 timestamp) {
   if (getState() != Player::Online)
     return;
@@ -105,14 +105,14 @@ QString ServerPlayer::waitForReply(int timeout) {
 #ifndef QT_DEBUG
     QThread::sleep(1);
 #endif
-    ret = "__cancel";
+    ret = QStringLiteral("__cancel");
   } else {
     ret = router->waitForReply(timeout);
   }
   return ret;
 }
 
-void ServerPlayer::doNotify(const QString &command, const QString &jsonData) {
+void ServerPlayer::doNotify(const QByteArray &command, const QByteArray &jsonData) {
   if (getState() != Player::Online)
     return;
   int type =
@@ -139,7 +139,7 @@ void ServerPlayer::kick() {
 
 void ServerPlayer::reconnect(ClientSocket *client) {
   if (server->getPlayers().count() <= 10) {
-    server->broadcast("ServerMessage", tr("%1 backed").arg(getScreenName()));
+    server->broadcast("ServerMessage", tr("%1 backed").arg(getScreenName()).toUtf8());
   }
 
   setState(Player::Online);
@@ -213,7 +213,7 @@ void ServerPlayer::onStateChanged() {
 
   auto state = getState();
   room->doBroadcastNotify(room->getPlayers(), "NetStateChanged",
-      QString("[%1,\"%2\"]").arg(getId()).arg(getStateString()));
+      QString("[%1,\"%2\"]").arg(getId()).arg(getStateString()).toUtf8());
 
   if (state == Player::Online) {
     resumeGameTimer();
@@ -225,14 +225,14 @@ void ServerPlayer::onStateChanged() {
 void ServerPlayer::onReadyChanged() {
   if (room && !room->isLobby()) {
     room->doBroadcastNotify(room->getPlayers(), "ReadyChanged",
-                            QString("[%1,%2]").arg(getId()).arg(isReady()));
+                            QString("[%1,%2]").arg(getId()).arg(isReady()).toUtf8());
   }
 }
 
 void ServerPlayer::onDisconnected() {
   qInfo() << "Player" << getId() << "disconnected";
   if (server->getPlayers().count() <= 10) {
-    server->broadcast("ServerMessage", tr("%1 logged out").arg(getScreenName()));
+      server->broadcast("ServerMessage", tr("%1 logged out").arg(getScreenName()).toUtf8());;
   }
 
   auto _room = getRoom();
diff --git a/src/server/serverplayer.h b/src/server/serverplayer.h
index 55b5da1e..6cb9d72e 100644
--- a/src/server/serverplayer.h
+++ b/src/server/serverplayer.h
@@ -31,11 +31,11 @@ class ServerPlayer : public Player {
 
   void speak(const QString &message);
 
-  void doRequest(const QString &command,
-           const QString &jsonData, int timeout = -1, qint64 timestamp = -1);
+  void doRequest(const QByteArray &command,
+           const QByteArray &jsonData, int timeout = -1, qint64 timestamp = -1);
   void abortRequest();
   QString waitForReply(int timeout);
-  void doNotify(const QString &command, const QString &jsonData);
+  void doNotify(const QByteArray &command, const QByteArray &jsonData);
 
   void prepareForRequest(const QString &command,
                         const QString &data);
diff --git a/src/server/shell.cpp b/src/server/shell.cpp
index b7509592..13e0049a 100644
--- a/src/server/shell.cpp
+++ b/src/server/shell.cpp
@@ -197,7 +197,7 @@ void Shell::msgCommand(QStringList &list) {
   }
 
   auto msg = list.join(' ');
-  ServerInstance->broadcast("ServerMessage", msg);
+  ServerInstance->broadcast("ServerMessage", msg.toUtf8());
 }
 
 static void banAccount(Sqlite3 *db, const QString &name, bool banned) {
diff --git a/src/swig/freekill.i b/src/swig/freekill.i
index 83ee1fb3..be8e0ae5 100644
--- a/src/swig/freekill.i
+++ b/src/swig/freekill.i
@@ -8,7 +8,6 @@
 #include "client/client.h"
 #include "server/server.h"
 #include "server/serverplayer.h"
-#include "client/clientplayer.h"
 #include "server/room.h"
 #include "server/roomthread.h"
 #include "ui/qmlbackend.h"
diff --git a/src/swig/naturalvar.i b/src/swig/naturalvar.i
index 9c7fb9f3..48c5b53a 100644
--- a/src/swig/naturalvar.i
+++ b/src/swig/naturalvar.i
@@ -88,8 +88,8 @@ QVariant Lua::readValue(lua_State *L, int index, QHash<const void *, bool> stack
     case LUA_TTABLE: {
       auto p = lua_topointer(L, index);
       if (stack[p]) {
-        luaL_error(L, "circular reference detected");
-        return QVariant(); // won't return
+        qCritical("circular reference detected");
+        return QVariant();
       }
       stack[p] = true;
 
@@ -104,7 +104,7 @@ QVariant Lua::readValue(lua_State *L, int index, QHash<const void *, bool> stack
         lua_pushnil(L);
         while (lua_next(L, index) != 0) {
           if (lua_type(L, -2) != LUA_TSTRING) {
-            luaL_error(L, "key of object must be string");
+            qCritical("key of object must be string");
             return QVariant();
           }
 
@@ -135,9 +135,9 @@ QVariant Lua::readValue(lua_State *L, int index, QHash<const void *, bool> stack
 
     // ignore function, userdata and thread
     default:
-      luaL_error(L, "unexpected value type %s", lua_typename(L, tp));
+      qCritical("unexpected value type %s", lua_typename(L, tp));
   }
-  return QVariant(); // won't return
+  return QVariant();
 }
 %}
 
@@ -156,7 +156,6 @@ SWIG_arg ++;
 
 %typemap(out) QString
 %{
-  // FIXME: 这里针对高频出现的字符串减少toUtf8调用避免创建新的bytearray...
   if ($1.isEmpty()) {
     lua_pushstring(L, "");
   } else if ($1 == "__notready") {
@@ -188,7 +187,7 @@ SWIG_arg ++;
 %}
 
 // 解决函数重载中类型检测问题
-%typecheck(SWIG_TYPECHECK_STRING) QString, QString const& {
+%typecheck(SWIG_TYPECHECK_STRING) QString, QString const&, QByteArray, QByteArray const& {
   $1 = lua_isstring(L,$input);
 }
 
@@ -238,9 +237,10 @@ SWIG_arg++;
 %typemap(arginit) QByteArray const &
   "QByteArray $1_str;"
 
-%typemap(in, checkfn = "lua_isstring") QByteArray const &
+%typemap(in, checkfn = "lua_isstring") QByteArray const & (const char * temp)
 %{
-  $1_str = QByteArray(lua_tostring(L, $input));
+  temp = lua_tostring(L, $input);
+  $1_str = QByteArray::fromRawData(temp, strlen(temp));
   $1 = &$1_str;
 %}
 
diff --git a/src/swig/qml-nogui.i b/src/swig/qml-nogui.i
deleted file mode 100644
index 90dc7373..00000000
--- a/src/swig/qml-nogui.i
+++ /dev/null
@@ -1,12 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-%nodefaultctor QmlBackend;
-%nodefaultdtor QmlBackend;
-class QmlBackend : public QObject {
-public:
-  static void cd(const QString &path);
-  static QStringList ls(const QString &dir);
-  static QString pwd();
-  static bool exists(const QString &file);
-  static bool isDir(const QString &file);
-};
diff --git a/src/swig/qt.i b/src/swig/qt.i
index f573fc2b..e464a2d0 100644
--- a/src/swig/qt.i
+++ b/src/swig/qt.i
@@ -3,15 +3,12 @@
 // Make the base classes look like "complete"
 
 %nodefaultctor QObject;
-%nodefaultdtor QObject;
 class QObject {};
 
 %nodefaultctor QThread;
-%nodefaultdtor QThread;
 class QThread {};
 
 %nodefaultctor QList;
-%nodefaultdtor QList;
 template <class T>
 class QList {
 public:
diff --git a/src/swig/server.i b/src/swig/server.i
index dc252c05..beef256e 100644
--- a/src/swig/server.i
+++ b/src/swig/server.i
@@ -53,10 +53,10 @@ public:
 %nodefaultdtor ServerPlayer;
 class ServerPlayer : public Player {
 public:
-  void doRequest(const QString &command,
-           const QString &json_data, int timeout, long long timestamp = -1);
+  void doRequest(const QByteArray &command,
+           const QByteArray &json_data, int timeout, long long timestamp = -1);
   QString waitForReply(int timeout);
-  void doNotify(const QString &command, const QString &json_data);
+  void doNotify(const QByteArray &command, const QByteArray &json_data);
 
   bool thinking();
   void setThinking(bool t);
diff --git a/src/ui/qmlbackend.h b/src/ui/qmlbackend.h
index ef20c3d8..eaf204a5 100644
--- a/src/ui/qmlbackend.h
+++ b/src/ui/qmlbackend.h
@@ -15,7 +15,7 @@ class QmlBackend : public QObject {
 
   // File used by both Lua and Qml
   static Q_INVOKABLE void cd(const QString &path);
-  static Q_INVOKABLE QStringList ls(const QString &dir = "");
+  static Q_INVOKABLE QStringList ls(const QString &dir = QStringLiteral(""));
   static Q_INVOKABLE QString pwd();
   static Q_INVOKABLE bool exists(const QString &file);
   static Q_INVOKABLE bool isDir(const QString &file);