e. " 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. Trying to register std::map<non_template_type_1,non_template_type_2> with Q_DECLARE_METATYPE() results in compilation failure and apparently is not supported. See also disconnect(), sender(), qRegisterMetaType(), Q_DECLARE_METATYPE(), and Differences between String-Based and. That class receives a list of variants (wrapping various data) and converts those variants into a binary stream using QDataStream >. qRegisterMetaType() requires also a Q_DECLARE_METATYPE() – dtech. I'm confused by this error, as the documentation states (emphasis mine): Returns the meta type id of type T at compile time. @Daddedebad As @Bonnie says qRegisterMetaType. That said, your stack trace is really strange: _dl_debug_initialize (ldbase=4294967292, ns=1095236752) at dl-debug. Gerald Gerald. To use the type T in QVariant, using Q_DECLARE_METATYPE() is sufficient. c:55 This looks like some loader initialization mismatch, check debug vs release builds of your application and libraries. You don't pass around copies of QObject derived types because it is not copyable. I tried and it looks like it's possible to register an enum type with Q_DECLARE_METATYPE or qRegisterMetaType and use it the same way. I tried with and without the qRegisterMetaType<Schedule::TimePairMap>(), with and without Q_DECLARE_METATYPE(Schedule::TimePairMap). To call qRegisterMetaType (), you still need to use Q_DECLARE_METATYPE (). 3. Custom Type Qlist and Scope. One of the overloads is a function template that can be used to create an alias for a type and the form is: qRegisterMetaType<Type> ("alias"); That is, it wants to know the type for which you are declaring something. QAbstractSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). io Please note that I do not use Q_DECLARE_METATYPE on purpose because I don't actually need its features (QVariant expansion) right now. type() typeName() PySide6. 0. 1 Answer. The struct is declared in my worker class, which is inside a namespace. no unexpected garbage data or the like). wysota. QMetaType. You had to use QMetaType::registerComparators () and the other static register functions in QMetaType to actually make use of that functionality, though. 基本理解. With Q_DECLARE_METATYPE and without qRegisterMetaType: No warning, slot is called With Q_DECLARE_METATYPE and with qRegisterMetaType: No warning, slot is called. Any class or struct that has a public constructor, a public copy constructor, and a public destructor can be registered. When I emit a signal, then I get next error to the output stream:. There's no need to call qRegisterMetaType that many times, once is enough. This allows me to use this type in a Q_PROPERTY, this all. This object can then be passed from QML to C++ via. Call qRegisterMetaType<std::string> (); in the initialization of your code. 1 Answer. qRegisterMetaType is also called in the class constructor. c:55 This looks like some loader initialization mismatch, check debug vs release builds of your application and libraries that are used. In the example's Message class, a static method is included to do this. 1、自定MyDataType 类型，在这个类型的顶部包含：#include <QMetaType>. I just found multiple examples showing the usage of Q_ENUM and Q_ENUMS and looking into the definition of Q_ENUM showed me that it includes Q_ENUMS and other definitions. It looks like one can register a type more than once, specifying different typenames, i. Please note that I do not use Q_DECLARE_METATYPE on purpose because I don't actually need its features (QVariant expansion) right now. Re: Qt warning of type conversion already registered Originally. "Custom types used by properties need to be registered using the Q_DECLARE_METATYPE() macro so that their values can be stored in QVariant objects. For that, I want to declare a. struct Matrix { double data [4] [4]; }; Ideally you should be using eigen3. Type is not registered, please use the Q_DECLARE_METATYPE macro to make it known to Qt's meta-object system. 4] QString QWebSocket:: subprotocol const. To use the type T in queued signal and slot connections, qRegisterMetaType<T>() must be called before the first connection is established. Any class or struct that has a public default constructor, a public copy. queued connections. You may have to register before you can post: click the register link above to proceed. Qt5でシグナルの引数としてユーザー定義型を指定する場合は、 Q_DECLARE_METATYPE と qRegisterMetaType () を使って方の登録を行う必要が. Qt. To enable using the type in queued signals and such, there also needs to be a corresponding call: qRegisterMetaType<foo::FooState>(); Question. However Q_DECLARE_METATYPE () is a bit more complicated. You can make them known ( Q_DECLARE_METATYPE ), however you can't register them as QML type. c:55 This looks like some loader initialization mismatch, check debug vs release builds of your application and libraries. The class is used as a helper to marshall types in QVariant and in queued signals and slots connections. Of course it's a bug and an odd mistake that Q_DECLARE_METATYPE(QList<QSslError>) is in qsslsocket. e. This allows us to use the Enum as a custom-type of a QVariant, to pass it between QML and Qt, to use it in synchronous signal-slot connections, and to print the symbolic enums (instead of a magic number) with qDebug(). To call qRegisterMetaType (), you still need to use Q_DECLARE_METATYPE (). 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. Alt. I haven't used that module yet but one thing you should do is remove the string argument from your qRegisterMetaType calls. Yes, templated types can be used in Qt signal/slots. in a header file and call @qRegisterMetaType<std::unique_ptr<Thing>> ();@ before your signal and slots are used. It is often easier and cleaner to define an ENUM inside a class (see ENUM), but if you need a standalone enum type, using the ENUM keyword outside of a class definition can be. container. 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. The reasoning is found in the discussion on Identity vs Value on the Qt Object Model page. cpp. It is a static method, it does not (cannot) change x2. I created a. 4 which does not support all C++11 features. uint64; If this is your first visit, be sure to check out the FAQ by clicking the link above. What worries me is that. jsulm Lifetime Qt Champion @shivaVMC last edited by . From the docs: int qRegisterMetaType ( const char * typeName ) Registers the type name typeName to the type T. It manages an insane amount of static variables and sets a static global pointer of. This results in access violations when Qt. # In the class MainWindow declaration #ifndef Q_MOC_RUN # define the tag text as empty,. The following code will work as well: using namespace foo; Q_DECLARE_METATYPE (MyClass) Teams. Declare new types with Q_DECLARE_METATYPE() to make them available to QVariant and other template-based functions. 4. Thank you Volker, I had a couple of problems I forgot about the Q_DECLARE_METATYPE(myType); and I don't' think I was never consistent with the global scope specifier. [quote author="Andre" date="1306394817"]In that case, I think you need to register them. Returns true if convert can convert from fromType to toType. Original Question. It seems that for a metatype that is a QList<MyClass::MyEnum> I must. 4] QString QWebSocket:: subprotocol const. and Q_DECLARE_METATYPE uses qRegisterMetaType() internally. 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. akshatrai91 7 Jan 2021, 06:21. The Custom Type, Custom Type Sending and Queued Custom Type examples show how to implement a custom type with the features outlined in this document. h" class B : public QObject { Q_OBJECT Q_PROPERTY(A* A1 READ getA1 WRITE setA1) Q_PROPERTY(A* A2 READ getA2 WRITE setA2) public: static A A1;. The class is used as a helper to marshall types in QVariant and in queued. It associates a type name to a type so that it can be created and destructed dynamically at run-time. Macros Detailed Description The QMetaType class manages named types in the meta-object system. Then you should register your object to use it with QML. To start viewing messages, select the forum that you want to visit from the selection below. Sorted by: 5. @Q_DECLARE_METATYPE (std::unique_ptr<Thing>);@. There's also no need for that typedef, it only makes the code less readable. Thus you need to use the runtime check QMetaType::type (). When the plugin is reloaded later, the old declaration still points to the original memory space of the now-unloaded library. You can also use QMetaEnum::fromType() to get the QMetaEnum. complains that the metatype isn't registered. I'm trying to use custom classes in QAbstractListModel, and the Q_DECLARE_METATYPE doesn't work at all! To test where the problem is, I've simplified the code as the following: #include <QMetaType> #include <QVariant> #include <QDebug> typedef int x; Q_DECLARE_METATYPE (x) void main () { QVariant v; qDebug () << v. void Message:: registerMetaType {qRegisterMetaType < Message >. QMetaType. Creating and Destroying Custom Objects 1 Answer Sorted by: 21 Objects are copied when put into a QVariant, but QObject derived classes cannot be copied, so the solution is to use a pointer to your class. This version of the function is to register alias types. Now, that Q_DECLARE_METATYPE enables the type for Qt template classes and QVariant. The class in Qt responsible for custom types is QMetaType. QLocalSocket. If the pointer stored in the QVariant can be qobject_cast to T, then that result is returned. Thus you need to use the runtime check QMetaType::type (). call qRegisterMetaType with the name specified, else reading properties. 2. That said, your stack trace is really strange: _dl_debug_initialize (ldbase=4294967292, ns=1095236752) at dl-debug. Now you have a valid QObject. More. 1. [virtual] QAbstractSocket:: ~QAbstractSocket Destroys the socket. . Using Qt 3D with QCustomPlot. The class is used as a helper to marshall types in QVariant and in queued signals and slots connections. Some structure need to be registered to be queued in asynchronous signals using qRegisterMetaType<T>(name), such as signal which passes QVector<int>. 1 Answer Sorted by: 21 Objects are copied when put into a QVariant, but QObject derived classes cannot be copied, so the solution is to use a pointer to your. I'm confused by this error, as the documentation states (emphasis mine): Returns the meta type id of type T at compile time. You may have to register before you can post: click the register link above to proceed. So, whatever Q_DECLARE_METATYPE is doing cannot be done by writing a function call. Connect and share knowledge within a single location that is structured and easy to search. If you only want to store pointer to Foo with the metatype system, then use qRegisterMetaType<Foo *> ();. Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. So, if you had a custom type FooType, you'd put the Q_DECLARE_METATYPE directly after the declaration, and in. QML Qvariant from custom class. [override virtual] bool QAbstractSocket:: waitForBytesWritten (int msecs = 30000) Reimplements:. uint64; If this is your first visit, be sure to check out the FAQ by clicking the link above. There's no compile time error, but when I run. Any errors from Qt's metatype systems are usually due to MOC (the "meta-object compiler"), which reads your header files and generates a "moc" file with metatype information for every class where the Q_OBJECT macro is declared. This function is useful to register typedefs so they can be used by QMetaProperty, or in QueuedConnections. 8. As you already have a typedef for your type, you can simply use Q_DECLARE_METATYPE as in the following example: #include <QtCore> template <typename T> struct Proxy { T data; }; typedef Proxy<QImage> TrayType; Q_DECLARE_METATYPE (TrayType) class Donor : public. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. I. When these files are processed by repc, repc generates both. Learn more about Teams I can't figure out a way to automatically declare a meta type, i. So in both cases qRegisterMetaType isn't required for the slot to be called and the custom type to be accessible within the slot (i. You pass around pointers instead. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. But I can't see a method to insert myClass into. Share Follow edited Apr 29, 2013 at 7:21 We will still need to register it with the meta-object system at run-time by calling the qRegisterMetaType () template function before we make any signal-slot connections that use this type. Data Type Conversion Between QML and C++. 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. e. The struct is declared in my worker class, which is inside a namespace. To start viewing messages, select the forum that you want to visit from the selection below. This won't work because you can't use qMetaTypeId<> () before Q_DECLARE_METATYPE<>. qRegisterMetaType vs. Any class or struct that has a public constructor, a public copy constructor, and a public destructor can be registered. A. According to the Qt docs for qRegisterMetaType "Any class or struct that has a public default constructor, a public copy constructor, and a public destructor can be registered. QList<T> isn't really a pre-defined variant type (except QList<QVariant>) so it technically resolves to a QMetaType::UserType. See also isRegistered () and Q_DECLARE_METATYPE (). Connect and share knowledge within a single location that is structured and easy to search. To use the type T in queued signal and slot connections, qRegisterMetaType<T>() must be called before the first connection is established. @kshegunov said in Undocumented automatic metatype registration in Qt6?: Your original code (in the top-mentioned topic) assumes std::unique_ptr is copyable, which it isn't, so it can not ever be a metatype. J 1 Reply Last reply Reply Quote 0. Detailed Description. Call qRegisterMetaType() to make types available to non-template based functions, such as the queued signal and slot connections. If you only want to store pointer to Foo with the metatype system, then use qRegisterMetaType<Foo *> ();. QVariant’s operator== now uses QMetaType::equals for the comparison. I need to call the Q_DECLARE_METATYPE() to pass the smart pointer. w/out GUI module you wouldn't have any of those types available). I have a few instances of QVector<MyClass> which I want them to be exposed to QScriptEngine. 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. @Wieland Thanks. Yes, templated types can be used in Qt signal/slots. 能猜到原因吗？注意看前面 Q_DECLARE_METATYPE() 代码， 对了。类中的成员函数qt_metatype_id中包含对qRegisterMetaType(typeName)的调用: 这儿就是辗转调用了这个带参数的qRegisterMetaType函数: unregisterType(const char *typeName) 函数的作用是取消自己先前注册的某个metatype类型。 and a Context class that holds an instance of MyGadget and exposes a pointer to it to QML via a Q_PROPERTY: #include <QObject> #include "mygadget. Qt Base (Core, Gui, Widgets, Network,. But because QUuid stores its content as a QByteArray which is already supported by QVariant, you. Normally, you would only register the pointer form if your class cannot be copied, as in the case of QObject and derivatives, but. Q&A for work. That said, your stack trace is really strange: _dl_debug_initialize (ldbase=4294967292, ns=1095236752) at dl-debug. Q_DECLARE_METATYPE. See also state() and Creating Custom Qt Types. QAbstractSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). by using qRegisterMetaType(). Does your code ever call qRegisterMetatype() or use Q_DECLARE_METATYPE()? 10th November 2014, 05:23 #3. QLocalSocket. waitForConnected ([msecs=30000]) # Parameters: msecs – int. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. I've registered my class with: @Q_DECLARE_METATYPE(MyClass);@ and. in a header file and call @qRegisterMetaType<std::unique_ptr<Thing>> ();@ before your signal and slots are used. Any idea what I'm missing please? BTW, no problem at all using Schedule in QMetaProperty or QVariant. You can create Q_GADGETS in QML using a C++ factory object registered to be accessible in QML, and a Q_INVOKABLE function in this factory which returns an instance of the Q_GADGET object. Obviously then you would not do registerComparator (). QLocalSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). Now I want to read this property with Qt's meta object system. void QLocalSocket:: abort ()The Qt docs make it clear that to use a custom type with Queued Connections, I need to use both Q_DECLARE_METATYPE and qRegisterMetaType. But there would be no trouble using the QMetaType class or using qRegisterMetaType before creating an instance of QCoreApplication or QApplication. 0 and have problems registering my own class as a QMetaType. Do do you register the meta type with the call qRegisterMetaType("your custom meta type")? 1 Reply Last reply Reply Quote 0. . Some structure need to be registered to be queued in asynchronous signals using qRegisterMetaType<T>(name), such as signal which passes QVector<int>. Also, Q_DECLARE_METATYPE(MyNamespace::MyType) should be in the header declaring MyType so that you don't have to repeat it all over again and again. Call qRegisterMetaType() to make type available to non-template based functions, such as the queued signal and slot connections. Otherwise your signals and slots connected used the old mechanism (with macros SIGNAL and SLOT) that require queueing of the parameters won't know how to do so. uint64; If this is your first visit, be sure to check out the FAQ by clicking the link above. " Currently I have no UI implemented (yet!). uint64; If this is your first visit, be sure to check out the FAQ by clicking the link above. That said, your stack trace is really strange: _dl_debug_initialize (ldbase=4294967292, ns=1095236752) at dl-debug. nyaruko. You may have to register before you can post: click the register link above to proceed. Unsure if my idea would work, I created a DataPoint class marked with Q_GADGET with three properties defined using Q_PROPERTY. @user6556709 I've added both of those, and it does compile now, but the string is just being default initialized to "" when I call value<T>() and there's a red line under Q_DECLARE_METATYPE that says no instance of overloaded function "qRegisterMetaType" matches the argument list, argument types are: (const char [12],. It's not enough to get reflection features out of a type this way (it does not create a QMetaObject), so for the thing to be useful at all you need at least Q_GADGET in both base and derived classes. 用qRegisterMetaType对自定义的类型进行注册，就是为了告诉Qt如何去做这些事情。. As a result, if the library connects a D-Bus signal to a slot with a signature "void mySlot (MyType)", it is. Returns the metatype of the parameter at the given index. So my first idea:. One of the overloads is a function template that can be used to create an alias for a type and the form is: qRegisterMetaType<Type> ("alias"); That is, it wants to know the type for which you are declaring something. 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. Note that you are technically lying to the meta type system. It will return the same result if it was called before. Also Q_DECLARE_METATYPE does not register a type, but declares it. Join Date Mar 2010 Posts 69 Thanks 8 Thanked 1 Time in 1 Post Qt products Platforms} Q_DECLARE_METATYPE(Topic) In main, I have included this: qRegisterMetaType<Topic>("Topic"); When propagating these elements from c++ to QML, everything is working. pro file, several errors appear referencing the QMouseEvent and QWheelEvent classes. J. Detailed Description. All Qt Overviews. 3. Don't use Q_DECLARE_METATYPE and qRegisterMetaType for your QObject enum. Has anyone else encountered this?See also qRegisterMetaType(). // - in a header: // - define a specialization of this template calling an out-of. Make sure you call it from within a method. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. Registers the type name . It must appear in a code block. I am also using some in queued signal and slot connections. 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. Q_DECLARE_METATYPE(TYPEDEF) Q_DECLARE_METATYPE(TYPEDEF) mainwindow. e. 手册中告诉我们，执行这个的时候，模板参数T必须用 Q_DECLARE_METATYPE() 声明过 能猜到原因吗？注意看前面 Q_DECLARE_METATYPE() 代码， 对了。类中的成员函数qt_metatype_id中包含对qRegisterMetaType(typeName)的调用 这儿就是辗转调用了这个带参数. ) summary refs log tree commit diff statsFoo and Foo* are different types and need to be registered separately. cpp 中，用connect函数 将抛出此结构体的信号和接收此结构体的槽函数关联之前，要调用qRegisterMetaType. Hope it. QMetaType registerNormalizedTypedef normalizedTypeName, type: metaType ); return. state() Creating Custom Qt Types. This also makes the type available for queued. in a header file and call @qRegisterMetaType<std::unique_ptr<Thing>> ();@ before your signal and slots are used. The. To use the type T in QVariant, using Q_DECLARE_METATYPE() is sufficient. As you have already found out, you must use Q_DECLARE_METATYPE to make the type known to Qt. . The logical equivalent of a const T &r (reference to const T) is a const T * const p (const pointer to const T). 2 Answers. call qRegisterMetaType with the name specified, else reading properties. staticMetaObject is of type QMetaObject and provides access to the enums declared with Q_ENUMS. qRegisterMetaType vs. Q_DECLARE_META_TYPE (Fruit) and qRegisterMetaType were redundant: #define PluginInterface_iid "pluginInterface" Q_DECLARE_INTERFACE (PluginInterface, PluginInterface_iid) //Actual plugin implementing PluginInterface class. To make the type known to this class, we invoke the Q_DECLARE_METATYPE() macro on the class in the header file where it is defined: Q_DECLARE_METATYPE (Message). Q_DECLARE_METATYPE QMetaType::type. The Custom Type, Custom Type Sending and Queued Custom Type examples show how to implement a custom type with the features outlined in this document. 幸哉~ Qt是支持自定义信号，且自定义信号可以发送自定义数据类型的对象。. @SGaist Yes, I am using it with QVariant, mostly with QSettings to save and retrieve data easily by overriding QDataStream operators. Adding a Q_DECLARE_METATYPE () makes the type known to all template based functions, including QVariant. Avoid having to qRegisterMetaType (pointer vs reference), concern about const. cpp. 14 vs 5. }; Q_DECLARE_METATYPE (MyCustomType); Then in my application, I have a signal "void sendMsg (MyCustomType)" and I qRegisterMetaType (). 0. An alternative would be to wrap shared_ptr<int> in your own class and implement comparison the way you want. Question: Is there a way to check at compile-time if qRegisterMetaType<T> () was called for a custom type T? The custom type T needs to be registered in Qt meta-type system in order to be used in e. said, try to directly pass shared_ptr with your signal/slots. 1. QObject can't be copied and all its descendants can't be copied also. To start viewing messages, select the forum that you want to visit from the selection below. Use it if you want to use it as a global enumerator and then you need to call the meta-type runtime registration from the library, not from the application. Franzk 26 May 2011, 06:59. Once they're known you can use them, but you can't create them on the QML side. Follow. Is your Q_DECLARE_METATYPE in a header file or an implementation file? Incidentally, there is a mistake in TreeItem. 基本理解. M. cruz Hello, To be completely candid, I haven't used GDB remotely and I'm certainly not so intimate with it for the log to speak to me much. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. View Profile View Forum Posts View Articles Beginner Join Date Nov 2014 Posts 6 Qt products. 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. namespace CCS { Q_DECL_EXPORT Q_NAMESPACE. I however have a scenario where I want to declare such an object in qml and transmit it to the c++. With Q_DECLARE_METATYPE and without qRegisterMetaType: No warning, slot is called With Q_DECLARE_METATYPE and with qRegisterMetaType: No warning, slot is called. Q_DECLARE_METATYPE. There's no need to call qRegisterMetaType that many times, once is enough. int videoSourceMetaTypeId = qRegisterMetaType< VideoSource > ();QAbstractSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). One of these plugins uses Q_DECLARE_METATYPE on some types that need to be stored in a QVariant. Research The QMetaType class manages named types in the meta-object system. So I am doing this: Qt Code: Switch view. There's no compile time error, but when I run. 1 Answer. See also state() and Creating Custom Qt Types. The ones I am registering for are mostly structs for storing data and just a few simple classes. Declare new types with Q_DECLARE_METATYPE() to make them available to QVariant and other template-based functions. QtCore. You can't with Q_GADGETS. Returns the internal ID used by QMetaType. 0. Q_DECLARE_METATYPE, as pointed out by @SingerOfTheFall, would register template based type into QVariant (so it can be retrieved using qvariant_cast<T>()). To make the type known to this class, we invoke the Q_DECLARE_METATYPE () macro on the class in the header file where it is defined: This now makes it possible for Message values to be stored in QVariant objects and retrieved later. 9k 9 34 52. My workround was to explicitly cast the enum values to int when passing them onto a function requiring a QVariant type, in my case. Also you may need to use qRegisterMetaType function. Adding a Q_DECLARE_METATYPE() makes the type known to all template based functions, including QVariant. To achieve this you need Q_DECLARE_METATYPE macro and qRegisterMetaType () function. Share. Call qRegisterMetaType() to register the data type before you establish the connection. The class is used as a helper to marshall types in QVariant and in queued signals and slots connections. What you made is a const pointer to a non-const T; but top-level consts in function signatures are not part of the function. qt. As a workaround, I'm using QVariantMap instead of std::map. There's no need to call qRegisterMetaType that many times, once is enough. I meet a qt metatype issue. It associates a type name to a type so that it can be created and destructed dynamically at run-time. ), or any other callable, cannot declare a type for use outside of the call site. You may have to register before you can post: click the register link above to proceed. To make the custom type generally usable with the signals and slots mechanism, we need to perform some extra work. Also, this Q_DECLARE_METATYPE(SharedTestClass) shouldn't be needed. Since Qt 5. Use it if you want to use it as a global enumerator and then you need to call the meta-type runtime registration from the library, not from the application. 4. The problem of owner ship of the memory is avoided. c:55 This looks like some loader initialization mismatch, check debug vs release builds of your application and libraries that are used. Last updated at 2016-07-08 Posted at 2015-11-16. I only care about runtime instantiation. The default access for a class is private, so that Container* data();. Email This BlogThis! Share to Twitter Share to Facebook Share to Pinterest. qRegisterMetaType vs. I want to use my objects as QVariants and for queued connections. Sorted by: 1. I think it would be great if we could run requests in a QThread, but right now it's not possible because the r. 1. Qt Remote Objects Compiler. I read a bit and it seems that Q_DECLARE_SMART_POINTER_METATYPE is supposed to allow this to work. I have created an qt bugticket hoping the documentation will be extended. Note: This function is thread-safe. To register. Now, in your registerTypes function, it should be registered like this: qRegisterMetaType<AccReal > ("data::AccReal"); In other words, the typeName string must match exactly the type of the signal argument as it is written there. Q_DECLARE_METATYPE (std::string) Quoting Qt Doc. You should use Q_DECLARE_METATYPE macro for this. QLocalSocket::SocketState is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType(). I store them in QVariant :. There's no need to call qRegisterMetaType that many times, once is enough. c:55 This looks like some loader initialization mismatch, check debug vs release builds of your application and libraries. namespace CCS { Q_DECL_EXPORT Q_NAMESPACE. QDBusArgument is the central class in the Qt D-Bus type. ) summary refs log tree commit diff stats Foo and Foo* are different types and need to be registered separately.