Afaik, QT is a cross-platform GUI toolkit for C++. It has hardly anything to do with WinSCP.
So, I guess that your question is actually, how to use WinSCP with C++ (possibly in a cross-platform way).
First, WinSCP is Windows-only. So you cannot use it in a cross-platform way.
If you develop for Windows only, you can call WinSCP .NET assembly via COM. Or you can call WinSCP scripting.
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