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POInstantiating C# Class Members in C++ using COM
 

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    <p>I would like to create a C# class object in C++ and set its member fields. Although I am able to create a C++ class object, I am unable to access it's members and set member field values.</p> <pre><code>/// &lt;summary&gt; /// Class for AQS Entity /// &lt;/summary&gt; [ClassInterface(ClassInterfaceType.None)] [Guid("70F12A44-B91D-474D-BD70-32B1ACE041D6")] [ProgId("AQSEntity")] public class AQSEntity : IEntity { public AQSEntity() { sRecoveryDBName = String.Empty; arrSourceMailboxesEntity = null; sQueryString = String.Empty; } [MarshalAs(UnmanagedType.BStr)] public string sRecoveryDBName = string.Empty; [MarshalAs(UnmanagedType.ByValArray)] public MailBoxCollection arrSourceMailboxesEntity; [MarshalAs(UnmanagedType.BStr)] public string sQueryString; } </code></pre> <p>and the IEntity class is defined below</p> <pre><code>[Guid("5C71057E-9FD9-47D5-B022-8D5F9C7007D3")] [InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface IEntity { } </code></pre> <p>In C++,</p> <pre><code>IEntity* pTest1 = NULL; hr = CoCreateInstance(__uuidof(**AQSEntity**),NULL,CLSCTX_INPROC_SERVER,__uuidof(IEntity),(void**)&amp;pTest1); </code></pre> <p>I want to access members of AQSEntity class in C++. But I am unable to access them.</p> <p>pTest1-> sQueryString </p> <p>gives error. </p> <blockquote> <p>'sQueryString' : is not a member of 'AsigraExchange::IEntity' C:\PROJECTS\COM\COMClient\COMClient.cpp 168</p> </blockquote> <p>Can anyone please suggest where I am wrong.</p> <p>Thanks, Gagan</p>
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    1. COYour interface is completely empty. Add properties and methods to it. Don't add fields.
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    2. COThere are other classes implementing IEntity. If I add properties and methods to IEntity, those classes cannot inherit from IEntity.
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