Unity3d and Logitech SDK - Can't find LogitechSteeringWheel.dll when ported to test machine

Questions & Answers
1

I have an odd problem. We are using the Logitech SDK with Unity3d from the asset store for use with a G27 Wheel and peddles. All works fine on my development machine in both the editor and when I make a build. Here are some specs:

Dev Machine Specs:
Windows 7
Unity 3.5.7
32 bit build
G27 Wheel and Peddles

Test Machine Specs:
Windows 7
G27 Wheel and Peddles

When I run the build on my dev machine it runs fine and detects the wheel. However, when I port the build over to a test machine the program runs but no response from the wheel. I looked at the log files that unity generates and it says it can’t find the LogitechSteeringWheel.dll yet when I look in the data/plugins folder the .dll is there. This happened on two test machines. So I ran Procmon ( a procedure monitor) to see if I could glean any details. When I run the test with procmon on it reports all calls to the LogitechSteeringWheel.dll as successful. So it seems to be accessing the .dll but Unity is somehow confused? Does the LogitechSteeringWheel.dll require any other dependancies - possibly from .NET or MONO?

I double checked that I am in fact using the x86 .dll with a 32 bit build.

Logitech tech support recommended a clean boot and to reinstall their drivers but that didn’t work either.

2

PROBLEM SOLVED: Okay…so I checked the DirectX versions on both my dev machine and the test machine. They were both DirectX 11. However, on the test machine the version was either slightly older or somehow components got deleted. We ran Logitech’s C++ demo on the test machine and it immediately popped up with an error saying that the XInput1_3.dll was missing. That clued us in that perhaps DirectX needed updating. We did and it now works.

Bottom line: Make sure you have the latest DirectX 11 Drivers if you want to use the Logitech SDK with Unity.

3

@JoeStrout
Same here.
My client had to install new laptops with Windows 10 ad what worked on Win7 totally fails on Windows10. The SteeringWheelSDKDemo.exe does not work anymore.
Have you figured out a solution for this ?

Thanks