Why can't my native .DLL project find my .NET .dll?

Question

I have followed the instructions provided by Smoke here: How to call a C# library from Native C++ (using C++\CLI and IJW)

I also made sure to add the .dll path to the additional #using directories of the native C++ project in visual studio. I also added #using to the wrapper .cpp file. All .cpp files have cli enabled, and I have enabled COM on the C# project (but I'm not using COM so that shouldn't matter).

I have also added the C# .dll to the execution path of the C++ .dll.

I am still getting System:IO:FileNotFoundException while debugging. Everything compiles fine, so Visual Studio has found the C# .dll, but my C++ .dll isn't finding it at runtime.

The full exception:

Does anyone have any idea why?

EDIT:

I figured it out. I didn't realize that the C# .dll needs to be in the same folder as the application that loads the C++ .dll, not in the same folder as the C++ .dll.

Check the bin directory to make sure both DLLs have been copied. Also don't compile for AnyCPU, use x64, as C++ does not support AnyCPU. — MineR, Oct 10 '17 at 21:57
Thank you for the suggestion. All .dll's have been copied to the same location. I am compiling for x86. — DustyEngineer, Oct 10 '17 at 21:59
I figured it out. I didn't realize that the C# .dll needs to be in the same folder as the **application** that loads the C++ .dll, not in the same folder as the C++ .dll. — DustyEngineer, Oct 11 '17 at 15:24
@DustyEngineer - If you figured it out submit an answer to your question. The solution to your question should not exist in the question itself. — Security Hound, Oct 11 '17 at 15:30

score -1 · Accepted Answer · answered Oct 11 '17 at 17:28

-1

I figured it out. I didn't realize that the C# .dll needs to be in the same folder as the application that loads the C++ .dll, not in the same folder as the C++ .dll.

answered Oct 11 '17 at 17:28

DustyEngineer

35
6

Why can't my native .DLL project find my .NET .dll?

1 Answers1