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I would like to add my C++ application a C# .NET GUI .
My C++ application is very simple but I have a some Pointer and Reference .
What is the Best way C# will recognize this pointer and Reference?
There are several ways, here are some, and it depends on your taste and on your project.
a) Use COM interop, if your C++ project is written in COM.
b) Use COM interop, you can write COM wrappers to your C++ application and use it from C#.
c) Use C++/CLI, that is, convert your project to become a Managed C++ application and create managed classes in C++ that use your C++ code.
You can also write a managed C++ dll that loads your C++ dll or static library.
d) Use P INVOKE C calls, exports DLL C functions from your C++ code that work with your C++ class, call the C functions from C# using [dllimport] attribute.
You can use type IntPtr and the better and safer SafeHandle to express pointers and references.
All ways have good things and drawbacks, but every listed tehcnique need a “middle layer”, you cannot call C++ code directly from C#.