Have you even received the following error after adding Qt to your Visual Studio project? The fix is easy but not what you would expect.
MSVCRTD.lib(exe_winmain.obj) : error LNK2019: unresolved external symbol WinMain referenced in function “int __cdecl invoke_main(void)” (?invoke_main@@YAHXZ)
To fix it, Open Properties for the project then go to Linker -> System and change the SubSystem to Not Set from the drop down list. Make sure you do this for All Configurations.
That’s it. Back to work!