how to check whether the connect in QT is successful or not

[Qt Enthusiast]

Hi I have

situation in which I connect a signal slot and pass some pointers in SLOT

now I question is that some time pointer allocation is done later but connect in done earlier so how do in code we can that connect fro signal and slot is successful

[Ratzz]

@Qt-Enthusiast said in how to check whether the connect in QT is successful or not:

how do in code we can that connect fro signal and slot is successful

Use qDebug() which returns true if connect is successful.

[jsulm]

@Ratzz You mean

qDebug() << connect(...);

:-)

[Ratzz]

@jsulm
Yes MOD :)
I was about to edit to

qdebug() << connect(sender, SIGNAL(hisSignal()), this, SLOT(hisSlot()));

[J.Hilk]

Technically it's return QMetaObject::Connection which has qDebug operator that returns true or false. But that's mostly nitpicking.

I would suggest using the new Qt5 Signal/Slot syntax, it checkes connections at compile time, meaning, if the connect can't work the compiler stops and you don't have a working program.

Simple.

[edit: fixed Qt typo SGaist]