Error when using QString in QMetaObject::invokeMethod

Question

Error:

error: no matching function for call to ‘QArgument<QString>::QArgument(
    const char [8],
   __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, 
   std::__cxx11::basic_string<char> >::value_type&)’

At:

QMetaObject::invokeMethod(
    mReceiver, 
    "setname", 
    Qt::QueuedConnection, 
    Q_ARG(QString, "test"));

Here is the error that I am facing when using QString as the parameter of Q_ARG() in QMetaObject::invokeMethod. So may I know is there any solution to this problem?

Try to invoke the constructor explicitly like this: QString("test") — Gabriella Giordano
– Gabriella Giordano, Commented Sep 28, 2021 at 15:21

ouflak · Accepted Answer · 2021-10-01 06:10:25Z

1

I found that we can directly convert the string to QString in Q_ARG() to prevent this error:

QMetaObject::invokeMethod(
    mReceiver, 
    "setname", 
    Qt::QueuedConnection, 
    Q_ARG(QString, QString::fromStdString("test")));

edited Oct 1, 2021 at 6:10

ouflak

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answered Oct 1, 2021 at 5:47

JJ Lim

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