Error when using QSignalSpy

QTLeearn

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SGaist

Hi,

Are you writing a test ?

QTLeearn

@sgaist I just want to trace a signal to see if it is emitted properly, I am open to any other methods

SGaist

Can you give more details about your use case ?

QTLeearn

@sgaist If you are asking about the use case of QSignalSpy, what I can add on is I used the QSignalSpy in this way instead of what I provided:

QSignalSpy spy(this, &myClass::testSignal);  // didn't compile

And the full error messages were:

Undefined reference to 'vtable for QTestEventLoop' (Error in qtesteventloop.h)
In function 'QTestEventLoop::~QTestEventLoop();' (Error in myClass.o)

I was actually facing the problem that though a connection was established successfully (by observing the return boolean value of function connect ), but the slot is not evoked. I am testing to see if the signal emitted properly, also there might be the case that either sender or receiver was destroyed

SGaist

Then you should rather check the lifetime of the objects that are connected.