Hello, friends!

I written in QSocket and blocking methods
Qt Code:
  1. waitForConnected ()
  2. waitForBytesWritten ()
  3. waitForReadyRead ()
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the application is working. But, i see warning
Qt Code:
  1. QObject :: connect: Unable to connect (null) :: destroy () with QHostInfoLookupManager :: waitForThreadPoolDone ()
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What problems might arise from this warning? How to disable it correctly? I can't use QCoreApplication in my library.

P.S. Advise best practices on the use of blocking sockets? Maybe there are examples somewhere?