如何在 C# 中实例化 IDispatchEx？

发布于 2024-11-04 09:52:45 字数 671 浏览 3 评论 0原文

这是我的第一个问题！我想实例化一个 COM 对象并将其强制转换为 IDispatchEx，以便我可以枚举其成员。下面是一个示例：

    Type _COMType = System.Type.GetTypeFromProgID("Scripting.FileSystemObject");
    var _COMObject = (IDispatchEx)Activator.CreateInstance(_COMType);

我的 IDispatchEx 与此网站上的相同（不是我的网站），除了 GetNextDispID 和GetMemberName 返回一个 int （我希望将其用于 HRESULT，如所述 MSDN）。

上面的例子不起作用。有没有办法像从 Active Scripting 转换到 IDispatchEx 接口一样实例化 COM 对象？

感谢您的任何和所有帮助/建议！

原文

this is my first SO question!
I would like to instantiate a COM object and cast it to IDispatchEx so that I can enumerate its members. Here is an example:

    Type _COMType = System.Type.GetTypeFromProgID("Scripting.FileSystemObject");
    var _COMObject = (IDispatchEx)Activator.CreateInstance(_COMType);

My IDispatchEx is identical to the one on this website (not my website), except that GetNextDispID and GetMemberName return an int (which I wish to use for HRESULT as described on MSDN).

The example above does not work. Is there any way to instantiate COM objects as you would from Active Scripting cast to the IDispatchEx interface?

Thanks for any and all help/suggestions!

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走走停停 2024-11-11 09:52:45

此操作失败，因为
COM 上的 QueryInterface 调用
IID 接口组件
'{A6EF9860-C720-11D0-9337-00A0C90DCAA9}'
由于以下错误而失败：否
支持此类接口（异常
来自 HRESULT：0x80004002
(E_NOINTERFACE))。

您收到的异常消息非常清楚，Scripting.FileSystemObject 根本没有实现 IDispatchEx 接口。仅 IDispatch。这工作得很好：

        Type t = System.Type.GetTypeFromProgID("Scripting.FileSystemObject");
        var obj = Activator.CreateInstance(t);
        var iobj = (stdole.IDispatch)obj;

你已经完成了，你不能强制 COM 组件类实现接口。我不希望有很多 COM 类来实现它，IDispatchEx 相当晦涩难懂。它适合 JScript 模式。

This operation failed because the
QueryInterface call on the COM
component for the interface with IID
'{A6EF9860-C720-11D0-9337-00A0C90DCAA9}'
failed due to the following error: No
such interface supported (Exception
from HRESULT: 0x80004002
(E_NOINTERFACE)).

The exception message you get is as clear as a bell, the Scripting.FileSystemObject simply doesn't implement the IDispatchEx interface. Only IDispatch. This works fine:

        Type t = System.Type.GetTypeFromProgID("Scripting.FileSystemObject");
        var obj = Activator.CreateInstance(t);
        var iobj = (stdole.IDispatch)obj;

You're done, you cannot force a COM coclass to implement an interface. I would not expect very many COM classes to implement it, IDispatchEx is pretty obscure. It fits the JScript mold.

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