How to get class name

[tovax]

Hi, all
Before qt5.15.2, I always used metaobject() - > classname() to get the class name, but now there is a warning.
How can I eliminate this warning, or am I using it incorrectly?

Call to virtual method 'MyClass::metaObject' during construction bypasses virtual dispatch [clang-analyzer-optin.cplusplus.VirtualCall]

Best regards!

[Pl45m4]

@tovax said in How to get class name:

Before qt5.15.2, I always used metaobject() - > classname() to get the class name

Why you need to do that?

BTW:
The warning is because you seem to call an overriden, virtual function inside your constructor, which shouldn't be done (ever, doesn't matter what Qt or C++ vesion).

[tovax]

@Pl45m4 Hi, thank you for your answer.
I want to get the class name. In fact, these classes are independent applets. I want to use the class name to create different working directories.

[tovax]

This post is deleted!

[tovax]

@Pl45m4 Oh, I see. Thank you very much.
Is there any other way to get the class name, please?

[Pl45m4]

@tovax

Where do you call these functions?
QMetaObject::className is ok but shouldn't be used in the constructor of any QObject derived class. You could try the showEvent (only if you actually show your MyClass widget afterwards)

This ensures that your widget was contructed completely

• https://doc.qt.io/qt-5/qwidget.html#showEvent

[tovax]

@Pl45m4 I get it.
Best regards!

[Pablo J. Rogina]

@tovax said in How to get class name:

I want to use the class name to create different working directories

What if the class itself provides the directory?
something like MyClass::getWorkingDir()

[tovax]

@Pablo-J-Rogina Hi, thanks!
I don't know if I understand your meaning correctly. I defined the getWorkingDir () method in the class, but I shouldn't call it in the constructor.

MyClass::MyClass(QWidget *parent) : QWidget(parent)
{
    QDir dir(getWorkingDir());
    if (!dir.exists()) {
        dir.mkpath(getWorkingDir());
    }
}

QString MyClass::getWorkingDir()
{
    // Warning: Call to virtual method 'MyClass::metaObject' during construction bypasses virtual dispatch 
    return QStringLiteral("%1/%2").arg(QApplication::applicationDirPath(), this->metaObject()->className());
}