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Qt signal slot argument type

Default arguments in slot. If you have code like this: class A: public QObject { Q_OBJECT public slots: void someSlot(int foo = 0); }; The old method allows you to connect that slot to a signal that does not have arguments. But I cannot know with template code if a function has default arguments or not. So this feature is disabled. This page describes the use of signals and slots in Qt for Python. The emphasis is on illustrating the use of so-called new-style signals and slots, although the traditional syntax is also given as a reference. In addition to that, it can receive also a named argument name that defines the signal name. If nothing is passed as name then the. Changing the signal-slot variables to QSharedPointer does not work either. Gives the same error: QObject::connect: Cannot queue arguments of type 'QSharedPointer' (Make sure 'QSharedPointer' is registered using qRegisterMetaType().) WORKS. All right, it seems to work.

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While developing with Qt, you only need to know about the absolute method index. Mat" ; right before the QObject:: The first element of the array is the return value. Updating the Stack Overflow Salary Calculator. It is a code generator and NOT a preprocessor like some people call it. It's not obviously relevant to the moc, but if you inherit QWidget you almost certainly want to have the parent argument in your constructor and pass it to the base class's constructor. All of these would work:

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Qt Documentation

This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Join Stack Overflow to learn, share knowledge, and build your career. What I'm trying to do is send a signal containing two cv:: Mat images from a QThread to the main thread, so that I can display the output.

There's no compile time error, but when I run the program, it gets stuck at a breakpoint in qglobal. Mat to the code, to no avail. I'm quite suck with what to do now. Gives the same error:. All right, it seems to work. Mat" ; right before the QObject:: However I still have to 'F5' past the breakpoint in qglobal. I might be wrong, but it seems that the location of qRegisterMetaType is not trivial. You need to call qRegisterMetaType in addition to the macro or instead of it, depending on your needs.

This is necessary for the signals to be able to marshal your data across threads. However, it might be a wiser idea to pass by reference or smart pointer, or raw pointer if you are using the QObject hierarchy to manage the object lifetime. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

How to send a Qt signal containing a cv:: In short, I get following error: Cannot queue arguments of type 'cv:: Mat' Make sure 'cv:: Mat' is registered using qRegisterMetaType. Gives the same error: Raf Berkvens 77 1 7. To be honest, I think you might have changed something else inadvertedly, because I don't think that the it matters where you call qRegisterMetaType if it's before the first connect.

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This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Join Stack Overflow to learn, share knowledge, and build your career. Does the constant and reference qualification make any difference compared to just using QString?

I thought the signal slot mechanism is capable of detecting argument type error at compile time. Qt checks a normalized signature , meaning. Normalization reduces whitespace to a minimum, moves 'const' to the front where appropriate, removes 'const' from value types and replaces const references with values.

If you leave out the reference, the string will be copied and having the const would not matter, any changes made to it will remain in the function alone. If you leave in the reference but take out the const, you allow the method to modify the string that you give it.

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By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Argument type for Qt signal and slot, does const reference qualifiers matters?

For signal and slot of below type signals: Qt checks a normalized signature , meaning Normalization reduces whitespace to a minimum, moves 'const' to the front where appropriate, removes 'const' from value types and replaces const references with values.

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