香蕉树上看芭蕉的博客1 QTcpServer not found 在pro文件中,加入network,之后一定要构建->执行qmake 2 use of undeclared identifier 'connect' class server :public QObject要继承来自QObject
weixin_39874366的博客 在编译后很可能遇到下述bug:error: use of undeclared identifier 'OCIBindByPos2' error: use of undeclared identifier 'OCIBindByPos2' 这是因为在Qt5.12里面调用的是OCIBindByPos2()函数,这个函数的第九个...
小桉桉冲吖的博客message_type_support_t const* rosidl_typesupport_cpp::get_message_type_support_handle > >()' 2.error: use of undeclared identifier 'cv_bridge' 3.error: no matching constructor for initialization of '...