@Christian-Ehrlicher Thank you for your advice. The sample code has been added to the bug report.

If doStuff() is not const, then don't declare d pointer as const: Q_D(myClass) // NO "const" here! d->doStuff();

Hi and welcome to devnet, @KIMI2023 said in not enough arguments for function-like macro invocation 'realloc': I met the same question, (Debug version NG, release version OK) Solution: find file[crtdbg.h]:D:\Windows Kits\10\Include\10.0.19041.0\ucrt\crtdbg.h to commet follow: //#define realloc(p, s) _realloc_dbg(p, s, _NORMAL_BLOCK, FILE, LINE) Changing a file in the Windows development framework is not the correct way to handle that situation. As was done in the patch I linked, fixing the code is.

@yuvaram If so, compile it with Network Download Example, which is officially available from Qt.

@Exotic_Devel said: Q_SLOTS Usar a macro em vez da keyword é recomendada quando você usa outras bibliotecas que podem colidir com o Qt em relação aos signals/slots, que é o caso do Boost.

@Jessica you're welcomed. Please don't forget to mark the post as solved.

Hi, QT_NO_PRINTER is (or not) defined when compiling Qt, not when loading or not a module. One thing you could is the qtHaveModule() function in your pro file and create the defines you need there. Hope it helps