On 13.11.2012 18:50, obiwanjacobi wrote:
Ok, I get the "call unmanaged C++ code from managed C# code" examples.
But I need something that works the other way around. The lifetime sequence
starts of with a call to an (unmanaged C++) exported dll method
(GetObjectFactory). I will implement the function in C++ but in that method
I want to new-up a managed equivalent factory object and return the
unmanaged representation of that (interface) -as a COM callable wrapper-
from the exported function.
I thought of making that managed factory object a managed COM object (with
clsid) and simply call CoCreateInstance on it, but I would rather not do
that because I don't know how that is supported on Mac and Linux...?
Is there a way to create a managed object in unmanaged code in mono? (so
without using MS CLI ;-)
You can pass the result of Marshal.GetComInterfaceForObject (an
IUnknown pointer) to C++ using an export and a function pointer:
C++:
extern "C" {
void RegisterFactory(FactoryFunction ptr);
}
C#:
[DllImport(...)]
static extern void RegisterFactory(FactoryDelegate ptr);
public delegate IntPtr FactoryDelegate(....);
...
RegisterFactory(delegate (....) {
object o = ....;
return Marshal.GetComInterfaceForObject(o, SomeCOMInterfaceType);
});
Since you don't have a registry, you must come up with a
"protocol" that describes which class to instantiate.
The "protocol" is what I've left out in the sample above
(the dots).
Robert
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