COM - 在 ATL C++ 项目中使用 IEnumerable [英] COM - use IEnumerable in ATL C++ project

问题描述

我在我的 C++ COM 服务器中使用了一个 C# COM DLL，它实现了 IEnumerable 以迭代集合.

I use in my C++ COM server a C# COM DLL that implements IEnumerable for iterating over a collection.

1. 如何在本机代码中指定要从 C# Dll 的实例对象访问 IEnumerable -> GetEnumerator() 方法?我是否必须导入一些 *.tlb 才能在我的 C++ 项目中看到 IEnumerable 接口?我看到的ienumerable接口是由mscorelib.dll定义的

1. How do I specify in my native code that I want to access IEnumerable -> GetEnumerator() method from the instance object of C# Dll ? Do I have to import some *.tlb in order to see IEnumerable interface in my C++ project ? Ienumerable interface I saw is defined by mscorelib.dll

我能否进一步向我的客户公开一个 IEnumerable 接口(在我的 C+ 项目的 IDL 中定义).举个例子会很有帮助

Can I further expose an IEnumerable interface to my clients (defined in IDL in my C+ project). An example would be helpful

推荐答案

它由类型库导出器自动翻译，System.Collections.IEnumerator 是 [ComVisible] 并被翻译成 IEnumVARIANT.例如:

It is automatically translated by the type library exporter, System.Collections.IEnumerator is [ComVisible] and gets translated to IEnumVARIANT. For example:

using System;
using System.Collections;
using System.Runtime.InteropServices;

[ComVisible(true), InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface IExample {
    IEnumerator GetEnumerator();

}
[ComVisible(true), ClassInterface(ClassInterfaceType.None)]
public class Example : IExample {
    public IEnumerator GetEnumerator() {
        yield return 42;
    }
}

被翻译成这个类型库片段:

Gets translated to this type library fragment:

// TLib :     // TLib : mscorlib.dll : {BED7F4EA-1A96-11D2-8F08-00A0C9A6186D}
importlib("mscorlib.tlb");
// TLib : OLE Automation : {00020430-0000-0000-C000-000000000046}
importlib("stdole2.tlb");

// Forward declare all types defined in this typelib
interface IExample;

[
  odl,
  uuid(9B046FDE-9234-3DE7-B055-DADE8F7B4A99),
  version(1.0),
  dual,
  oleautomation,
  custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, "IExample")    

]
interface IExample : IDispatch {
    [id(0xfffffffc)]
    HRESULT GetEnumerator([out, retval] IEnumVARIANT** pRetVal);
};

注意 mscorlib.tlb 的 importlib 指令，该指令位于 c:windowsmicrosoft.netframeworkv2.0.50727 中，编译器无需帮助即可找到.

Note the importlib directive for mscorlib.tlb, present in c:windowsmicrosoft.netframeworkv2.0.50727 and found by the compiler without help.

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