Qt-DLLs in a .NET-Application

**scary hallo** · 4th February 2015, 07:50

Hello,
we have a relatively big Qt-Application(for Windows), which is split into many DLLs. On the other hand we are developing a .NET Application. The two applications have a lot in common. So the question is: Is it possible to use Qt-DLLs(c++) in a .NET-Application (Windows Forms)? If yes, what is the best approach?

**wysota** · 4th February 2015, 07:51

It depends what this c++ part is supposed to do for your app.

**scary hallo** · 4th February 2015, 14:37

In the first step I would like to display some GUI-elements (QWidgets) in some kind of wrapper-form in the .NET app.

**wysota** · 4th February 2015, 16:58

To do that first you need to integrate the two event loops so that events for both systems are processed. As for wrapping Qt widgets into .NET form, I have no idea if this is possible. You should be able to show Qt widgets in a new window though.

**ChrisW67** · 4th February 2015, 20:05

I have not done it myself but the docs indicate you should be able to embed a Qt-based ActiveX control into a .Net form. Non GUI classes can be integrated more directly with some wrapper code.
http://doc.qt.io/qt-5/activeqt-dotnet.html