使用另一个 COM 库中定义的接口并从中派生

Question

我在 Visual Studio 中有两个 C++ COM 项目。在 ProjectA 中，我在 MIDL 中定义了 InterfaceA。在 ProjectB 中，我想定义继承于 InterfaceA 的 InterfaceB 。是否可以在不从 ProjectA 导入 IDL 或 H 文件的情况下完成此操作？

下面是代码的布局，可能更清晰。这些库很大，因此我将内容放在单独的文件中，以便于维护。

项目A

InterfaceA.idl

import "oaidl.idl";
import "ocidl.idl";

[ uuid( ... ) ]
interface InterfaceA : IDispatch { ... }

CoclassA.idl

import "InterfaceA.idl";

[ uuid( ... ) ]
interface CoclassA
{
    [default] interface InterfaceA;
};

ProjectA.idl

import "InterfaceA.idl";

[ uuid( ... ) ]
library ProjectA
{
    interface InterfaceA;
    #include "CoclassA.idl"
}

项目B

InterfaceB.idl

import "oaidl.idl";
import "ocidl.idl";

// If both interfaces were in the same project, I'd just import:
//import "InterfaceA.idl";

// Without the import I get a compilation error, obviously. I don't want to
// add ProjectA as an additional include directory because I don't want ProjectB
// to be dependent on how ProjectA's files are organized. I just want the types
// from ProjectA to be available here.

[ uuid(...) ]
interface InterfaceB: InterfaceA { ... }

CoclassB.idl

import "InterfaceB.idl";

[ uuid( ... ) ]
interface CoclassB
{
    [default] interface InterfaceB;
};

ProjectB.idl

import "InterfaceB.idl";

[ uuid( ... ) ]
library ProjectB
{
    // I wish using importlib would help here, but it won't since InterfaceB is
    // defined and compiled by MIDL separately in InterfaceB.idl.
    //importlib("ProjectA.tlb");

    // I could try to #include "InterfaceB.idl", but then I would lose the
    // automatic dependency analysis that MIDL does. I am also having trouble
    // getting the MIDL compiler to understand #defines.

    interface InterfaceB;
    #include "CoclassB.idl"
}

我有一种感觉，我想做的事情是不可能的。如果 MIDL 支持库之外的 importlib 等效项，那么这将不是问题！