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    <p>If the interface in your question is a COM interface, the approach given by Quassnoi might not be sufficient. You have to pay attention to the threading-model of the COM object in use. If the secondary thread will join a separate COM apartment from the one that your COM object was created in, and if that object is not <em>apartment-agile</em>, you'll need to marshal that interface pointer so that the secondary thread gets a proxy, and not a direct pointer to the object.</p> <p>A COM object is normally made apartment-agile by using a special implementation of IMarshal. The simplest approach is to aggregate the Free Threaded Marshaler.</p> <p>Some useful links...</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/ms693316.aspx" rel="nofollow noreferrer">CoMarshalInterThreadInterfaceInStream</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms693729(VS.85).aspx" rel="nofollow noreferrer">GlobalInterfaceTable (GIT)</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms694500.aspx" rel="nofollow noreferrer">CoCreateFreeThreadedMarshaler</a></li> </ul> <p>Update: About the Free-threaded Marshaler...</p> <p>It's clear from comments on this topic that some people would recommend that you never touch the FTM. While "Effective COM" is an excellent book, I think some of its recommendations are open to interpretation. Item 33 says "Beware the FTM"; it does not say "Never use the FTM". Very wisely it advises caution particularly when your apartment-agile object holds references to other objects, because they might not be apartment-agile. So really the advice is: think carefully when building apartment-agile objects, whether or not they use the FTM to achieve their agility. If you're sure you can build an apartment-agile object, I see no reason why you wouldn't use the FTM to achieve that.</p>
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    1. POHow to pass an interface pointer to a thread?
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    1. USMartin
    1. USMartin
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    1. COFTM has dangerous aspects (see Effective COM, item 33, "Beware the Free-Threaded Marshaler")
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      1. USJason S
    2. COThe GIT is very useful though.
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    3. COYeah, never use FTM...
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      1. USMatt Davison
 

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