C#活动事件在C ++客户端中导致错误，但在VB6中有效 [英] C# Active events cause error in C++ client but work in VB6

问题描述

我正在用C#编写ActiveX，将在旧版C ++应用程序中使用.
除了事件处理之外，一切正常.
问题是当在C#中引发事件时，出现以下错误:

I am writing an ActiveX in C#, to be used in a legacy C++ application.
It all works ok, apart from event handling.
The problem is that when the event is raised in C# I get the following error:

An unhandled exception of type ''System.InvalidCastException'' occurred in AwDotNetPinchOcx.dll
	Additional information: Unable to cast COM object of type ''System.__ComObject'' to interface type ''AwDotNetPinchOcx.__AwPinchGrid''. 
	This operation failed because the QueryInterface call on the COM component for the interface with IID ''{76F027EC-3D40-449E-B7E6-EFDF7CC63963}'' 
	failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

但是，C#ActiveX在测试的VB6应用程序中可以正常工作.
而且，本机VB6 ActiveX在C ++应用程序中也能正常工作！

因此，我目前的解决方法是包含C#ActiveX的VB6 ActiveX包装器，
并在其中传递数据和事件.

我想摆脱这个包装器.
有人可以帮忙吗?

====================================
C ++应用程序使用ConnectionPoint事件接收器方法:
===================================

However, the C# ActiveX works fine in a test VB6 app.
And, a native VB6 ActiveX works fine in the C++ application!

My work-around at the moment is therefore a VB6 ActiveX wrapper that contains the C# ActiveX,
and passes data and events across.

I want to get rid of this wrapper though.
Can anyone help?

=====================================
The C++ app uses the ConnectionPoint event sink method:
=====================================

DWORD EventSinkHolder::AddEventSink(REFIID iid, IUnknown* pYourEventSink)
   {
   DWORD sinkCookie = 0;
   IUnknown* pEventSource = EventSourceInterface();
   HASSERT(pEventSource);
   LPCONNECTIONPOINTCONTAINER pConnectionPointContainer = NULL;
   if (SUCCEEDED(pEventSource->QueryInterface(IID_IConnectionPointContainer, (void**)&pConnectionPointContainer)))
      {
      HASSERT(pConnectionPointContainer);
      LPCONNECTIONPOINT pConnectionPoint = NULL;
      if (SUCCEEDED(pConnectionPointContainer->FindConnectionPoint(iid, &pConnectionPoint)))
         {
         HASSERT(pConnectionPoint);
         // connect passed event sink interface to event source
         pConnectionPoint->Advise(pYourEventSink, &sinkCookie);
         pConnectionPoint->Release();
         // record connection for benefit of RemoveAllEventSinks
         mySinkEntries.Append(new EventSinkEntry(iid, sinkCookie));
         }
      pConnectionPointContainer->Release();
      }
   return sinkCookie;
   }

===================================
===================================
C#ActiveX遵循Codeplex示例"CSActiveX"中使用的标准方法.
http://1code.codeplex.com/SourceControl/changeset/view/45838#394692

=====================================
=====================================
The C# ActiveX follows the standard method used in the Codeplex sample "CSActiveX"
http://1code.codeplex.com/SourceControl/changeset/view/45838#394692

推荐答案

由于不同的调用约定，您依赖于包装器.如果您使用Google搜索，很快就会发现这一点.

Because of the different calling conventions you are dependant of the wrapper. If you search with google you soon will find proof of this.

这篇关于C#活动事件在C ++客户端中导致错误，但在VB6中有效的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！