AnyCPU/x86/x64 for C# application and it's C++/CLI dependency

Question

I\'m Windows developer, I\'m using Microsoft visual studio 2008 SP1. My developer machine is 64 bit.

The software I\'m currently working on is managed .exe written i

Answer 1

There is a way: to have an "AnyCPU" C# wrapper and a C++ project per architecture, and let the C# wrapper load the right C++ project at run time.

For the C++ project, create one version per different architecture (x86, x64), and build them all. Then in the wrapper do:

public class CppWrapper
{
    // C++ calls that will be dynamically loaded from proper architecture:
    public static readonly Func MyCplusplusMethodUsableFromCsharpSpace;

    // Initialization:
    static CppWrapper()
    {
        if(Environment.Is64BitProcess)
        {
            MyCplusplusMethodUsableFromCsharpSpace = CppReferences64.MyCplusplusClass.Method;
            // Add your 64-bits entry points here...
        }
        else
        {
            MyCplusplusMethodUsableFromCsharpSpace = CppReferences32.MyCplusplusClass.Method;
            /* Initialize new 32-bits references here... */
        }
    }

    // Following classes trigger dynamic loading of the referenced C++ code
    private static class CppReferences64
    {
        public static readonly Func MyCplusplusMethod = Cpp64.MyCplusplusMethod;
        /* Add any64-bits references here... */
    }
    private static class CppReferences32
    {
        public static readonly Func MyCplusplusMethod = Cpp32.MyCplusplusMethod;
        /* Add any 32-bits references here... */
    }
}

And in the C++ code, I use the same sources as I said, but will compile to different namespace depending on the build architecture:

#ifdef _M_X64
namespace Cpp64 {
#else
namespace Cpp32 {
#endif
    public ref class MyCPlusPlusClass
    {
        public: static __int64 Method(void) { return 123; }
    };
}