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How to integrate a native C++ plugin for Unity HoloLens project
Brekel
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I'm trying to figure out how to integrate some C++ code in a Unity HoloLens project but am having some difficulties. For now it's just some test code that receives and spits out a value, nothing fancy yet.
The C++ code works fine in the Unity editor and works when building a regular x86 or x64 executable. But I have no idea how to get it to work in a HoloLens UWP build, using the existing x86 dll doesn't seems to do anything at all when I run the Unity build in the HoloLens Emulator.
Do I need to compile the C++ code in a special way for UWP?
Or can I use the existing x86 dll by doing some magic in either Unity or the final UWP build in Visual Studio?
Any ideas?
Best Answer
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@Brekel said:
Do I need to compile the C++ code in a special way for UWP?Yes! Just like if you were making a normal UWP app, you would need your native library to be built for the UWP platform. The easiest thing to do is to create a new empty native dynamic project for UWP in Visual Studio, and copy the project settings over to your vcxproj.
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UWP projects should only have references to UWP compatible libraries. It just makes things easier. I'd add a new C++ UWP class library project to your C# unity project, and then add a reference to it.
@Jasper,
Figures you'd be the one to ask the Unity UWP interop question. It was only a matter of time.
Though not specifically for hololens, this looks like it addresses this topic at around 44 minutes.
The presenter is Adam Tuliper.
James Ashley
VS 2017 v5.3.3, Unity 2017.3.0f3, MRTK 2017.1.2, W10 17063
Microsoft MVP, Freelance HoloLens/MR Developer
www.imaginativeuniversal.com
Thanks for the link, will definitely look at that in depth!
Hehehe, yeah well some of the cool stuff is still best to do in native C++ I guess
Yes! Just like if you were making a normal UWP app, you would need your native library to be built for the UWP platform. The easiest thing to do is to create a new empty native dynamic project for UWP in Visual Studio, and copy the project settings over to your vcxproj.
Well I don't normally make UWP apps, just win32 desktop apps
Looks like I can link in static C++ libraries into a UWP app.
Except when I do it with the library I'm currently looking at (ZeroMQ) it appears to fail to eventually load in Unity, possibly due to the library's dependency on kernel32.lib, or something else I'm not aware of just yet.