EEFileLoadException when using C# classes in C++(win32 app)

Question

For deployment reasons, I am trying to use IJW to wrap a C# assembly in C++ instead of using a COM Callable Wrapper.

I\'ve done it on other projects, but on this o

Answer 1

The problem was where the DLLs were located.

• c:\dlls\managed.dll
• c:\dlls\wrapper.dll
• c:\exe\my.exe

I confirmed this by copying managed.dll into c:\exe and it worked without issue. Apparently, the CLR won't look for managed DLLs in the path of the unmanaged DLL and will only look for it where the executable is. (or in the GAC).

For reasons not worth going into, this is the structure I need, which meant that I needed to give the CLR a hand in located the managed dll. See code below:

AssemblyResolver.h:

/// 

/// Summary for AssemblyResolver
/// 
public ref class AssemblyResolver
{
public:

static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
{
    Console::WriteLine( "Resolving..." );

    Assembly^ thisAssembly = Assembly::GetExecutingAssembly();
    String^ thisPath = thisAssembly->Location;
    String^ directory = Path::GetDirectoryName(thisPath);
    String^ pathToManagedAssembly = Path::Combine(directory, "managed.dll");

    Assembly^ newAssembly = Assembly::LoadFile(pathToManagedAssembly);
    return newAssembly;
}

};

Wrapper.cpp:

#include "AssemblyResolver.h"

extern "C" __declspec(dllexport) IMyObject* CreateMyObject(void)
{
    try
    {
        AppDomain^ currentDomain = AppDomain::CurrentDomain;
        currentDomain->AssemblyResolve += gcnew ResolveEventHandler( AssemblyResolver::MyResolveEventHandler );

        return new CMyWrapper( );
    }
    catch(System::Exception^ e)
    {
        System::Console::WriteLine(e->Message);

        return NULL;
    }
}