C＃wrapper接口错误：E_NOINTERFACE [英] C# wrapper interface error: E_NOINTERFACE

问题描述

我试图为我有一个COM对象（名为SC_COM.dll）生成一个C＃包装，但我有一些问题链接到Visual Studio 2008（运行Vista）。我需要做这个免注册COM DLL - 我使用清单文件让Visual Studio知道SC_COM.dll，这似乎是工作。我使用TblImp.exe生成一个类型库（SC_COMtlb.dll），我在Visual Studio 2008中引用，所以我可以做早期绑定与我需要的DLL。这些DLL都在清单和可执行文件的同一目录中。

I am trying to produce a C# wrapper for a COM object that I have (named SC_COM.dll), but am having some issues linking it with Visual Studio 2008 (running Vista). I need to do this registration-free with the COM DLL--I'm using a manifest file to let Visual Studio know about SC_COM.dll, and that appears to be working. I used TblImp.exe to generate a type library (SC_COMtlb.dll) that I'm referencing in Visual Studio 2008 so I can do early binding with the DLL that I need. The DLLs are both in the same directory as the manifest and the executable.

这里是问题：当我实例化对象，并尝试和调用其中的一个方法在C＃它会引发以下错误：

Here's the issue: When I instantiate the object and try and call one of its methods in C#, it throws the following error:

检测到错误：无法将类型为SC_COMtlb.SCAccessObjClass的COM对象转换为接口类型SC_COMtlb.ISCUploader '。此操作失败，因为COM组件上的QueryInterface调用与IID'{C677308A-AC0F-427D-889A-47E5DC990138}'的接口失败，原因是以下错误：不支持此类接口（来自HRESULT的异常：0x80004002（E_NOINTERFACE）） 。

Error detected: Unable to cast COM object of type 'SC_COMtlb.SCAccessObjClass' to interface type 'SC_COMtlb.ISCUploader'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{C677308A-AC0F-427D-889A-47E5DC990138}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

我不完全确定这个错误是什么意思 - 我对错误代码进行了搜索，是一个相对一般的C＃错误。所以我要在这里以错误的方式链接COM对象，还是有一些其他重要的步骤，我可能会失踪？

I'm not entirely certain what this error means--I've done a search on the error code, and it appears to be a relatively general C# error. So am I going about linking the COM object the wrong way here, or is there some other important step I may be missing?

我应该注意到，我不是完全确定如何生成的类型库（S \C_COMtlb.dll）知道实际的COM DLL的位置，因为它没有注册到系统 - 我认为它只是看起来在同一个目录。

I should probably note that I'm not entirely sure how the type library (S\C_COMtlb.dll) that I produced knows where the actual COM DLL is, since it's not registered with the system--I assume it just looks in the same directory. Could this potentially be the issue, and if so, how can I better link the two?

推荐答案

尝试将此添加到您的应用程序中.exe.manifest：

Try adding this to your App.exe.manifest:

<comInterfaceExternalProxyStub 
  name="ISCUploader" 
  iid="{C677308A-AC0F-427D-889A-47E5DC990138}"
  proxyStubClsid32="{00020424-0000-0000-C000-000000000046}"
  baseInterface="{00000000-0000-0000-C000-000000000046}"
  tlbid = "{PUT-YOUR-TLB-GUID-HERE}" />

其中TLBID可以从Visual Studio生成的Native.Namespace.Assembly.Name.manifest找到，像这样：

Where TLBID can be found from your Visual Studio generated Native.Namespace.Assembly.Name.manifest, looking like this:

<typelib tlbid="{A-GUID-IS-HERE--USE-IT}"
  version="1.0" helpdir="" resourceid="0" flags="HASDISKIMAGE" />

我在这段时间里碰到了这个问题，但我发现了这些有用的参考文献，一起工作，对我有用。

I was banging my head against this for quite some time, but I found these helpful references and pieced it together and it's working for me:

• 为什么在创建支持该界面的对象时会得到E_NOINTERFACE？


• 免注册Skype4Com和多线程公寓


• 免注册激活COM组件：演练

• Why do I get E_NOINTERFACE when creating an object that supports that interface?
• Registration-Free Skype4Com and multithreaded apartment
• Registration-Free Activation of COM Components: A Walkthrough

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