emitting and catching signals

[srohit24]

Should i place the connect command in classB's constructor to connect the signals as classB has classA's instance?

EDIT

I placed the connect code in the classB's constructor.The app compiled successfully but i got this in qDebug

connect(classA_object,SIGNAL(receiving_finished()), this, SLOT(write_data()));
 
QObject::connect: Cannot connect (null)::receiving_finished() to classB::write_data()

connect(classA_object,SIGNAL(receiving_finished()), this, SLOT(write_data()));

QObject::connect: Cannot connect (null)::receiving_finished() to classB::write_data()

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