Question

I have a method call that returns Type. I want to make use of the type and do some reflection from C++. Have code like this:

MonoClass* klass = (MonoClass*)mono_runtime_invoke (...);

I am pretty sure that the casting to MonoClass* is not appropriate. The function returns a MonoObject*. How do I coerce the MonoObject* containing a reference to Type to MonoClass*. I want to be able to be able to call:

mono_class_get_properties (type, &iter)

iteratively, later.

Answer 1

Solution 1

If you have an access to the .NET code, the simpliest way is to return the type’s TypeHandle. In the native code, you can access the MonoTypeby unboxing the result of the invocation.

In C#:

static IntPtr GetUnderlyingTypeHandle()
{
    Type type;
    // ...
    return type.TypeHandle.Value;
}

In native code:

MonoMethod *method = ...; // Retrieve the method to call
MonoObject *obj = mono_runtime_invoke(method, NULL, NULL, NULL);
MonoType *underlyingType = *(MonoType **) mono_object_unbox(obj);

Solution 2

If you cannot change the .NET code, then you have to call the TypeHandle and Value getters in native code.