[Mono-dev] MonoType trouble when adjusting method signature

[Jonathan S. Chambers]

I have to do some adjustments to the method signatures of the native function calls for COM Interop. In most cases, the return type of a managed method on a RCW is really the last parameter of the COM method call. For example:

C#
double GetDouble();

C++/COM
int GetDouble(double* val); // the int return value is the standard HRESULT

In adjusting the signature I have a MonoType* (double in this case) which is the  return type. I need to get the corresponding byref version of that MonoType, and apply the PARAM_ATTRIBUTE_OUT attribute to that type's attributes in order to use it as a parameter in the unmanaged method signature. Any advice on how to do this? There is a dup_type method in class.c, but it seems like I'm missing something.

Thanks,
Jon