[Mono-dev] Creating Managed COM objects from C++ (on linux).

[Andreas Färber]

Hi,

Am 19.12.2008 um 22:27 schrieb Tom Hindle:

> I had to convert from a MonoObject to a COM interface pointer.
> The only way I could work out how to do this was by using some  
> internal mono functions. (removing static from mono src files ect.)
>
>> 	comClassInstance = mono_object_new (m_domain, comClass);	
>> 	
>> 	if (comClassInstance == NULL)
>> 	{
>> 		fprintf(stderr, "Failed to create instance of %s.%s from assembly  
>> %s\n", classNamespace.c_str(), className.c_str(),  
>> assemblyName.c_str());
>> 		return 1;
>> 	}
>> 	
>> 	////
>> 	// Get object callable from C++
>> 	////
>> 		
>> 	mono_init_com_types(); // Internal mono function
>> 	
>> 	void *pCCW =  
>> (void 
>> *)ves_icall_System_Runtime_InteropServices_Marshal_GetIUnknownForObjectInternal 
>> (comClassInstance); // Internal mono function
>> 	
>> 	cominterop_ccw_queryinterface(pCCW,(guint8*)&riid,  
>> (void**)ppvObject); // Internal mono function
>
> I think I could replace  
> ves_icall_System_Runtime_InteropServices_Marshal_GetIUnknownForObjectInternal 
>  with mono_lookup_internal_calls
> but I don't know how to get around the need to call  
> mono_init_com_types() and cominterop_ccw_queryinterface().

Regarding the icall, you could just obtain the corresponding  
MonoMethod* and execute it via mono_runtime_invoke.

For the other two, just check where they are called normally.

HTH,
Andreas