The QML engine provides built-in support for a large number. 150%) wider. More. No, everything is in separated folders. Improve this answer. しかし、Qtを使っている場合は、わざわざ自分でMutexの管理をしなくても、スレッドとのデータのやり取りを全て signal/slotでやってしまい、共有データを. Consider the specific case of qRegisterMetaType. – Kamil Klimek. qRegisterMetaType<MyStruct>("MyStruct"); 若已经使用 Q_DECLARE_METATYPEQ 标记过该类型，可以使用其不带参数的版本： qRegisterMetaType<MyStruct>(); 同样的，若对象包含在自定义的命名空间中时，注册时要带上完整的命令空间，如： qRegisterMetaType<NSP::MyStruct>("NSP::MyStruct"); Note that for enum types, you no not even need to call qRegisterMetaType () in these cases. Here's the twist: this class is contained in a shared library, and therefore I want to avoid instructing anyone using my library to call qRegisterMetaType. This fully updated, classroom-tested book teaches C++ “The Qt Way,” emphasizing design patterns and efficient reuse. Returns true if the Q_PROPERTY () exposes binding functionality; otherwise returns false. QBluetoothDeviceInfo which provides similar information for remote devices. All. By convention, these files are given a . " and: "Warning: This function is useful only for registering an alias (typedef) for every other use case Q_DECLARE_METATYPE and qMetaTypeId() should be used instead. 2、在类型定义完成后，加入声明：Q_DECLARE_METATYPE (MyDataType); 3、在main ()函数中. I'm not sure how to do this in python but. org is deprecated as of August the 11th, 2023. stackexchange. Improve this answer. Read and abide by the Qt Code of Conduct. Currently I have a 2d array which represents the game board. queued connections. 二者的联系： QMetaTypeId<TYPE>的类中的成员包含对qRegisterMetaType的调用. (Make sure 'QTextCursor' is registered using qRegisterMetaType (). Reproducible Example Of The. An alternative would be to wrap shared_ptr<int> in your own class and implement comparison the way you want. Call qRegisterMetaType() to make types available to non-template based functions, such as the queued signal and slot connections. Returns true if the write succeeded; otherwise returns false. It can be used to check if the connection is valid and to disconnect it using disconnect(). Foo and Foo* are different types and need to be registered separately. Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. Execute qRegisterMetaType<QItemSelection> (); before it is used as such, e. 因为没有指定 connect的链接方向 Qt::DirectConnection. The Qt doc on qRegisterMetaType explicitly says : T must be declared with Q_DECLARE_METATYPE (). Detailed Description. Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. Also, to use type T with the QObject::property() API, qRegisterMetaType() must be called before it is used, typically in the constructor of the. Instead, we should pass weak_ptr to a shared_ptr. As said in int qRegisterMetaType () documentation: To use the type T in QVariant, using Q_DECLARE_METATYPE () is sufficient. Any class or struct that has a public default constructor, a public copy constructor , and a. I guess it's the qRegisterMetaType () call itself that's missing. bool QAbstractItemModel:: insertColumn ( int column, const QModelIndex & parent = QModelIndex ()) Inserts a single column before the given column in the child items of the parent specified. To enable creation of objects at run-time, call the qRegisterMetaType () template function to register it with the meta-object system. a copy of a cv::Mat object will point to the same data as the copied from item). Your uint8_t is atomic and you don't need to register it, just use. It is more or less explained in the manual for int qRegisterMetaType (const char *typeName) This function requires that T is a fully defined type at the point where the function is called. I tested your code on Qt 5. (Make sure 'QQuickChangeSet' is registered using qRegisterMetaType (). 1 Answer. 9k 13 13 gold badges 106 106 silver badges 138 138 bronze badges. I created a. e. (Make sure 'QVector<int>' is. 如果要使自定义类型或其他非QMetaType内置类型在QVaiant中使用，必须使用该宏。. 3k 33 33 silver badges 58 58 bronze badges. So you can call it from your constructor. The only changes were made to initArgs and appendArgs functions. If a field is empty, keep it in the result. These are syntactically atrocious, but that’s templates for you. You have to register your custom type for queued signals because by registering it, Qt can make a copy of it in its event loop (which certainly uses QVariant) and pass it as argument later (when the original passed value is long since out of. ) I read about qRegisterMetaType() and try to implement it in the constructor of both classes, like this:. The class is used as a helper to marshall types in QVariant and in queued signals and slots connections. QSignalSpy can connect to any signal of any object and records its emission. Doc states:. ) It plans for a new trajectory just Okay, but when I try to execute the planned trajectory it gives me the following errors:your struct or simple class must have Q_GADGET as minimum; you should declare properties in order to access from qml; you must declare your struct/class by Q_DECLARE_METATYPE(); you must register it using qRegisterMetaType<>() somewhere before loading qml file by engine such as main. class QtGuiApplication : public QWidget { Q_OBJECT public: explicit QtGuiApplication (QWidget *parent = 0. QtWidgets import * Er. I have gave you below the basic process for a deletion for example. E. Improve this answer. ) このような場合は以下の通り qRegisterMetaType() の引数を設定することで回避できることがある。You can safely remove the const, even if the real signature of SendData and ReceiveData is const u_char*. 1 Answer. hEvaluating Scripts. You can define one with the enum keyword. If you only want to store pointer to Foo with the metatype system, then use qRegisterMetaType<Foo *> ();. As soon as the first event arrives I got the errormessage: @QObject::connect: Cannot queue arguments of type 'QQuickChangeSet'. You should use Q_DECLARE_METATYPE macro for this. Follow answered Sep 16, 2014 at 4:21. See also. Problem: There is no update of the UI. h" enum Color { RED = 0, BLUE, GREEN }; Q_DECLARE_METATYPE (Color) #endif /* ENUMS_H */. ;. 5 times (ie. g. If _message is a string then the slot must have the argument: foo_text = "Foo" self. Be very careful as cv::Mat is not implicitly shared, it is just shared (i. You can connect a signal to a slot with connect () and destroy the connection with disconnect () . 2、使用 qRegisterMetaType，将对象注册为元类型 使用qRegisterMetaType对自. ui). It just allows you to queue types that. It also reflects the size of the paging file at that time. 1、自定MyDataType 类型，在这个类型的顶部包含：#include <QMetaType>. Provide details and share your research! But avoid. Replacing it with "%matplotlib qt5" (or deleting it entirely) worked for me. new children are appended at. Call qRegisterMetaType() to make types available to non-template based functions, such as the queued signal and slot connections. flush ( self) This function writes as much as possible from the internal write buffer to the socket, without blocking. )" caused by working in threads. QTextCharFormat. Nejat Nejat. 12. QSharedPointer is a smart pointer class in the Qt library. call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke(). an int and a std::string. Q_DECLARE_METATYPE is only needed for template-based functions. 在使用 qRegisterMetaType<int>("int&");注册一个自定义类型给线程后，就出现“启动程序失败,路径或者权限错误”的提示，之后程序就一直编译不过去。不管删除了相关的文件后，或者重新构建，都是一样的问题。 但是，在不断的摸索后，突然之间就可以了，后面实验. ) But if I change the Q_DECLARE_METATYPE call to: namespace my_namespace { Q_DECLARE_METATYPE(BathyHint) } everything workes fine. What is the expected behavior. ) It still works but point to the fact that I am doing something wrong, and I am not sure that I will keep working when more threads are active. Adding a Q_DECLARE_METATYPE() makes the type known to all template based functions, including QVariant. In this __init__ we create the QPlainTextEdit that will contain the logs. However documentation of qRegisterMetaType() says: "Call this function to. Toggle Light / Dark / Auto color theme. 0’ of a module called ‘com. Someone may be able to correct me here, but I don't think you should be needing to register the type int&. There's no compile time error, but when I run. The QMetaType class manages named types in the meta-object system. ", which suggests it is only for classes and structs. ). 在使用 qRegisterMetaType<int>("int&");注册一个自定义类型给线程后，就出现“启动程序失败,路径或者权限错误”的提示，之后程序就一直编译不过去。不管删除了相关的文件后，或者重新构建，都是一样的问题。 但是，在不断的摸索后，突然之间就可以了，后面实验. websocket. setContextProperty qmlRegisterType qRegisterMetaType等区别. We strongly advise against using it in new code. qRegisterMetaType <rQJsonObject> ("rQJsonObject"); With this: no matching function for call to 'qRegisterMetaType'. Data Type Conversion Between QML and C++. e. 这里您需要在使用setContextProperty ()之前创建此类对象。. If you need a socket, you have two options: Instantiate QTcpSocket or QUdpSocket. I'm writing python library for very simple text output to Qt's QTextBrowser window (stored in window. For the moment, moc will extract and record all tags, but it will not handle any of them specially. You can try it:This function registers the Python type in the QML system with the name qmlName, in the library imported from uri having the version number composed from versionMajor and versionMinor. ChildAdded and ChildRemoved events are sent to objects when children are added or removed. g. I have gave you below the basic process for a deletion for example. Section and Key Syntax. The QML engine provides built-in support for a. This also makes the type available for queued signal-slot communication as long as you call it before you make the first connection that uses the type. // to be declared somewhere Q_DECLARE_METATYPE(std::string); // to be invoked at the beginning of program qRegisterMetaType<std::string>(); Without type registration Qt doesn't know how to do a copy and provides a warning in logs. Teams. 12. Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. QSignalSpy can connect to any signal of any object and records its emission. (Parent is QTextDocument (0x5a28e48), parent's thread is QThread (0x8dbcc0), current thread is QThread. multithreaded software and I am getting the warning says: (Make sure. Detailed Description. The following code allocates and destructs an instance of MyClass: Type names can be registered with QMetaType by using either qRegisterMetaType() or registerType(). ) QObject::connect: Cannot queue arguments of. Did you try to use qRegisterMetaType function? The official manual says: The class is used as a helper to marshall types in QVariant and in queued signals and slots connections. Hello, Can someone tell me about how to register a metatype in pyqt5. Follow answered Sep 16, 2014 at 4:21. Qt documentation specifically states that qRegisterMetaType<T>() must be called for a type to work in the Qt property system. Re: How to use Q_DECLARE_METATYPE. Yet, the first line is invisible and this line becomes visible only if we click on it! Very weird! QObject::connect: Cannot queue arguments of type 'QTextCursor'. 1,609 4 22 34. ) So it seems to be a multi-threading issue caused by this instruction connect (process,&QProcess::started, [this. ) QObject::connect: Cannot queue arguments of type 'QVector<int>'. Bachir. QObject::connect: Cannot queue arguments of type 'QList<QPersistentModelIndex>' (Make sure 'QList<QPersistentModelIndex>' is registered using qRegisterMetaType(). #define. qRegisterMetaType () is called to register the TYPE and generate a TYPE ID. As you have already found out, you must use Q_DECLARE_METATYPE to make the type known to Qt. ) Is this a reminder t. setFontStretch(factor) Sets the stretch factor for the font to. In QML, the meta-type system is the only way that QML engine can access C++ structures from a QML environment. clicked. I created a. However Q_DECLARE_METATYPE () is a bit more complicated. A QItemSelection describes the items in a model that have been selected by the user. I created a. ) QObject::connect: Cannot queue arguments of type 'QTextCursor'. ) @. qRegisterMetaType<Subclass> ("Subclass") also doesn't work. by using qRegisterMetaType(). qRegisterMetaType<QSqlDatabase>("QSqlDatabase"); Just changing the signal to this form: void dbConnected(QSqlDatabase *db); And, in the slot side I'll use something like this: void onDBConnected(QSqlDatabase * const db); I'm concerned with the usage of db (as in the beginning I've made the reference const), so I make it const here. This replaces the now-deprecated Q_ENUMS and will automatically register the metatype. Nov 30, 2012 at 8:31. Here’s the list of what changed: QVariant used to forward isNull () calls to its contained type – but only for a limited set of Qt’s own types. Since you're passing the parameter via a pointer you don't need to register the type AFAIK. Data Type Conversion Between QML and C++. ) You can read about how to call qml functions from c++. Now you have a valid QObject. show(); int functionIndex = win. – pmf Feb 7, 2019 at 16:35 QObject::connect: Cannot queue arguments of type 'QTextCursor' (Make sure 'QTextCursor' is registered using qRegisterMetaType(). Thus the following will fail. A connection defines an interface for sending/receiving data independent of the protocol. Note that if you intend to use the type in queued. 052592317]: Writing. More frustrating is I've found PySide documentation alluding to the use of qRegisterMetaType, but I can't find out where to call it from. qRegisterMetaType<QAbstractSocket::SocketState>(); Share. The following example records all signal emissions for the clicked () signal of a QCheckBox:Step 1 (mark for MOC), build some QObjects That pattern uses Q_PROPERTY and Q_OBJECT and the MoC tool. MyEnum needs to be registered with qRegisterMetaType. 8 data bits. Share. When data values are exchanged between QML and C++, they are converted by the QML engine to have the correct data types as appropriate for use in QML or C++. This requires the exchanged data to be of a type that is recognizable by the engine. qRegisterMetaType<QAbstractSocket::SocketState>(); Share. 我们知道类中的成员函数并不一定会被调用(即，该宏并不确保类型被注册到MetaType)。 通过qRegisterMetaType可以确保类型被注册; 两个qRegisterMetaType 的联系如果还希望使用这种类型的引用，可同样要注册：qRegisterMetaType<TextAndNumber>("TextAndNumber&"); 版权声明：本文为wangzhiqian7hao原创文章，遵循 CC 4. (异步调用) Qt::BlockingQueuedConnection，则将以与Qt :: QueuedConnection相同的方式调用该方法，除了当前线程将阻塞直到事件被传递。. . QtGui. しかし、Qtを使っている場合は、わざわざ自分でMutexの管理をしなくても、スレッドとのデータのやり取りを全て signal/slotでやってしまい、共有データを. qRe gisterMetaType 的函数原型为： ```c++ template < type name T> int. The SplitBehavior type is a typedef for QFlags <SplitBehaviorFlags>. g. You only. If any data was written, this function returns true; otherwise false is returned. Even though qRegisterMetaType(). If you use QMetaObject::invoke you've got an option to choose connection type - Direct or Queued. So I don't stream the pointer itself just copy the properties and set them to a new created pointer object. metaObject()->method(functionIndex); qDebug() << mm. and another folder with the obj files. Nope, registering with qRegisterMetaType<std::vector<int>>() has same effect as not registering at all (using QVector<int> works without registration, but does not expose length, either). launch" and then "roslaunch velo2cam_calibration laser_pattern. Now, when you send some data, it is copied. call qRegisterMetaType() to register the data type before you establish the connection. @Mark81 Actually you'll probably need only Q_DECLARE_METATYPE as this is done at compile time - exposing the type to the metatype system (I know it is an enum but it's needed for the QVariant and the like). Can you show the code that's actually causing the. cpp; so you will have. Make sure 'QTextCursor' is registered using qRegisterMetaType(). Returns the access specification of this method (private, protected, or public). You have to register your custom type for queued signals because by registering it, Qt can make a copy of it in its event loop (which certainly uses QVariant) and pass it as argument later (when the original passed value is long since out. This requires the exchanged data to be of a type that is recognizable by the engine. Now it works fine when pressButtonInsert is triggered but returns this. It is. Call qRegisterMetaType<std::string> (); in the initialization of your code. [since 6. self. Using qRegisterMetaType() is actually registering a certain type to QMetaType. Inheritance diagram of PySide6. metaObject()->indexOfSlot("testFunc ()"); QMetaMethod mm = win. 2 Answers Sorted by: 3 You do not need to call qRegisterMetaType () to use a type with QVariant. This way your metatype will be registered once at startup, and the registration is close by the implementation and does not require to modify <code>main</code>. Jun 13, 2021 at 19:37. qmlRegisterUncreatableType# qmlRegisterUncreatableType (pytype: type, uri: str, versionMajor. QVariant’s operator== now uses QMetaType::equals for the comparison. template<class T> QMetaObject::Connection connect_from_pointer ( const QSharedPointer<T>& sender,. Q_DECLARE_METATYPE (QSqlRecord) has to be outside any classes and namespaces. When sender and receiver objects do not live in the same thread, the Qt::QueuedConnection type is used. October 21, 2020 by Fabian Kosmale | Comments As you might know, Qt has a metatype system which provides run-time dynamic information about types. For the record your issue come from the fact that Qt preprocessor for signals and slots, the moc, does not use a full-blown C++ parser. I provide a minimal working example for int reference arguments. The ones I am registering for are mostly structs for storing data and just a few simple classes. Nejat Nejat. Just installing it did not work for me. You could try using registerConverter () to allow implicit conversion of the shared_ptr<int> to a regular int, and compare them that way. #include<QMetaType> typedef QList<int> IntList; qRegisterMetaType<IntList> ("IntList"); error C2909: 'qRegisterMetaType': explicit instantiation of function template requires return type. In practice, both the Q_DECLARE_METATYPE() macro and the qRegisterMetaType() template function can be used to register custom types, but qRegisterMetaType() is only required if you need to perform. That always worked in Qt4, but in Qt5 I get the following error: @error: specializing member ‘::qRegisterMetaType<Subclass>’ requires ‘template<>’ syntax@. It provides functions for creating and manipulating selections, and selecting a range of items from a model. Data should be passed by pointers through signals and slots, so it should be registered as, something like qRegisterMetaType<*Data> ("pData"); All signals and slots should take the arguments. Then you should register your object to use it with QML. Detailed Description#. Without this binding click will result in no action. For example, setting to 150 results in all characters in the font being 1. When data values are exchanged between QML and C++, they are converted by the QML engine to have the correct data types as appropriate for use in QML or C++. In QML, the meta-type system is the only way that QML engine can access C++ structures from a QML environment. In general, you only need Q_DECLARE_METATYPE (). If I save it just at the beginning of. Returns true if the column is inserted; otherwise returns false. QObject::connect: Cannot queue arguments of type 'object' (Make sure 'object' is registered using qRegisterMetaType(). clicked. 2D Graphics #. This has been changed, and isNull () now only returns true if the QVariant is empty or contains a nullptr. 1 Answer. ) Nothing special is printed to the execution log. qRegisterMetaType 은 특정한 유형 을 MetaType 시스템 에 등록 합 니 다 ; 양자 의 관계: QMetaTypeId < TYPE > 클래스 의 구성원 은 qRegisterMetaType 호출 을 포함 합 니 다 ; 클래스 의 구성원 함수 가 반드시 호출 되 는 것 은 아니 라. @reddy9pp said in QObject::connect: Cannot queue arguments of type 'std::string' (Make sure 'std::string' is registered using qRegisterMetaType(). qRegisterMetaType<foo::FooState>(); Question. I searched the Doc but I could not find a documentation to. Detailed Description. Make a typedef for QSharedPointer<UserDataType>, and use both Q_DECLARE_METATYPE as well as qRegisterMetaType () to register it for use. registerType () determines which register is used for the operations. Also, to use type T with the QObject::property() API, qRegisterMetaType<T>() must be called before it is used, typically in the constructor of the class that uses T, or in the main() function. You can use the tags to annotate your methods. As explained in this thread you can try using a typedef, including the QMetaType header and then using both Q_DECLARE_METATYPE macro and the qRegisterMetaType function (as implied by this thread on a similar issue). ) QObject::connect: Cannot queue arguments of type 'QVector' (Make sure 'QVector' is registered using qRegisterMetaType(). How to register custom type with QML if it is passed as const from C++. Usually one puts this (note that the typedefed name is used as string argument): qRegisterMetaType < QSharedPointer < TestClass > > ( "SharedTestClass" );To use the type T in queued signal and slot connections, qRegisterMetaType() must be called before the first connection is established. The related type must provide a public default constructor, a public copy constructor and a public destructor to be eligible to be declared as a metatype. ) So it seems to be a multi-threading issue caused by this instruction connect (process,&QProcess::started, [this. One of these plugins uses Q_DECLARE_METATYPE on some types that need to be stored in a QVariant. See also insertColumns (), insertRow (), and removeColumn (). Got the following warnings when running latest code in "develop": QObject::connect: Cannot queue arguments of type 'QTextBlock' (Make sure 'QTextBlock' is registered using qRegisterMetaType(). In that case, I think you need to register them. Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. Fixes #46, the logging handler was trying to update a GUI element dir…. – Kamil Klimek. ) I have defined MyStruct in an accessible header file: myheader. QtCore import * from PyQt5. ) QObject: Cannot create children for a parent that is in a different thread. The object it returns should also be a member of the factory class. emit() create new model elements that have QPersistentModelIndex associated that are not thread-safe and that Qt monitors its creation to warn its misuse as in this case since modifying that element is unsafe since it implies. Pyqt is nothing more than a "translation" from the Qt library (written in C++) to Python, and as this library functions within an object-oriented paradigm, Python code must also be written that way, with widgets represented. Before emitting a signal across a thread boundary with a non-trivial argument type (like QModelIndex ), you must first call this: qRegisterMetaType<QModelIndex> ("QModelIndex"); That prepares Qt to be able to emit the signal across a thread boundary. See also convert(). Type names can be registered with QMetaType by using either qRegisterMetaType () or registerType (). Nov 30, 2012 at 8:31. evaluate("1 + 2"); evaluate () returns a QScriptValue that holds the result of the evaluation. ) What I have done is, declare in the main the qRegisterMetatype but it still complaining. This is the same as indexOfMethod (), except that it will return -1 if the method exists but isn't a signal. karensantana. This site will remain online in read-only mode during the transition and into the foreseeable future. This requires the exchanged data to be of a type that is recognizable by the engine. The habit of passing shared_ptr by ref should not be followed in lambdas. It seems QVariant is not direct part of queued connections mechanism. Sorted by: 5. I am trying to learn Qt and I am attempting to do so by making a little titres game. Also you may need to use qRegisterMetaType function. (Make sure 'uint64' is registered using. ) On any update in C++ side list, modify the qml data as well. Step 2 (meta type Declare macro), if needed, describe your custom type/class to things like QVariant, QDebug and other "support" systems used everywhere on QObjects. Finds signal and returns its index; otherwise returns -1. ;. It can be done with some global container, but because in C++ order of initializing variables is not defined - it may be not trivial. For pointer types, it also requires that the pointed to type is fully defined. Otherwise you might be adding duplicate entries to the metatype database each time. When data values are exchanged between QML and C++, they are converted by the QML engine to have the correct data types as appropriate for use in QML or C++. When I try to build our existing. Registers the type name typeName for the type T. QScriptEngine myEngine; QScriptValue three = myEngine. If the Microsoft compiler was not requiring this, then it was doing it wrong. 这两个东西真难理清，不妨看看源码吧。. Also, to use type T with the QObject::property () API,. This requires the exchanged data to be of a type that is recognizable by the engine. ) summary refs log tree commit diff statsHello! Thanks for the package. ) but does not allow the transmission of data between threads, for this case it must be registered using qRegisterMetaType<MyClass::ErrorCode>("ErrorCode"): main. It can be done with some global container, but because in C++ order of initializing variables is not defined - it may be not trivial. A QVariant containing a pointer to a type derived from QObject will also return true for this function if a qobject_cast to the template type T would succeed. Currently, on Linux and Android it is used for specifying connection to a server listening to a socket bound to an abstract address. Only users with topic management privileges can see it. @SGaist Yes, I am using it with QVariant, mostly with QSettings to save and retrieve data easily by overriding QDataStream operators. qRegisterMetaType<QVector<int> > ("QVector<int>"); Once you make this call, you should be able to emit the QVector type over queued connections. 0. launch, the quads in rviz cannot detect the enviroment and it shows QObject::connect: Cannot queue arguments of type 'QVector' (Make sure 'QVector' is registered using qRegisterMetaType(). Read and abide by the Qt Code of Conduct. I also have to implement for cv::Mat type data. It associates a type name to a type so that it can be created and destructed dynamically at run-time. Note that if you intend to use the type in queued signal and slot connections or in QObject's property system, you also have to call qRegisterMetaType() since the names are resolved at runtime. But anyway, it is a good practice to use copyable and self-constructable types for stream operators. (Make sure 'QVector<int>' is registered using qRegisterMetaType(). 5. template <typename T> struct QMetaTypeId<Container<T>>. when i use real velodyne VLP16, i got some problem! when i use velodyne VLP16 package,"roslaunch velodyne_pointcloud VLP16_points. QAbstractSocket is the base class for QTcpSocket and QUdpSocket and contains all common functionality of these two classes. h #pragma once #include <QThread>. @pyqtSlot, in turn, is a decorator which converts simple python method to Qt slot. qRegisterMetaTypeしているにもかかわらずQObject::connectでランタイムエラーが出る場合の回避策. Share. the type name must be specified without the class, as in. It is part of QMetaType, which is not implemented by PySide. 10, enumerations are directly supported in QML. Note: This function is thread-safe. You can use the tags to annotate your methods. qRegisterMetaType<geometry_msg::msg::Pose>(); // In MainWindow's constructor. Tested on Linux Ubuntu. 12. A common way to register the type is in main or with a static function register. To register VideoMeta you need to call qRegisterMetaType<VideoMeta>(). This function requires that T is a fully defined type at the point where the function is called. program exits if.