FIX：修复日志输出到txt中文乱码的bug

loghandler.cpp

@@ -49,6 +49,7 @@ void messageHandler(QtMsgType type, const QMessageLogContext &context, const QSt
                      .arg(fileName).arg(context.line).arg(context.function).arg(msg);
     std::cout << msgOut.toLocal8Bit().constData() << std::endl;
     QTextStream in(&g_file);
+    in.setCodec("UTF-8");
     in << msgOut << "\n";
 //    g_file.flush();
     g_mutex.unlock();