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Work with remote COM+ server who implement IUnknown

Posted on 2001-07-09
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Last Modified: 2011-09-20
How can I use the function CoCreateInstanceEx to create a new remote instance of a COM+ object who implements IUnknown?.
I try this and I receive the message error:Such interface not suported.
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Question by:Nedelescu
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rtenhove earned 50 total points
ID: 6270750
HRESULT
CreateInstanceOnServer
    (
    wchar_t         * pwszRemoteName,
    REFCLSID          rclsid,     // Class identifier of the object to create
    REFIID            riid,       // Identifier of the interface to return
    LPVOID          * ppv         // Returned interface pointer
    )
{
/////////////////////////////////////////////////////////////////////////
    // Prepare a description of the remote server.
    //
    HRESULT           hres;
    COSERVERINFO      si;
    COSERVERINFO    * psi = 0;  // default to "no server info specified"
    if ( pwszRemoteName != 0 && ::wcslen( pwszRemoteName ) > 0 )
    {
        si.dwReserved1 = 0;
        si.pwszName    = pwszRemoteName;    // Server name
        si.pAuthInfo   = 0;                 // Default authority
        si.dwReserved2 = 0;
        psi = &si;
    }
    /////////////////////////////////////////////////////////////////////////
    // Create the designated object type on the server.  In order to
    // optionally specify the remote server, we must use CoCreateInstanceEx.
    //
    MULTI_QI          rgmq[ 1 ];
    rgmq[ 0 ].pIID = &riid;
    rgmq[ 0 ].pItf = 0;
    rgmq[ 0 ].hr   = S_OK;

    hres = ::CoCreateInstanceEx(
        rclsid,                         // Identifier of class to create
        0,                              // Pointer to outer unknown (aggr.)
        CLSCTX_SERVER,                  // Class creation context
        psi,                            // Server information (if any)
        N_ARRAY_ELEMENTS( rgmq ),       // # of interfaces to query
        rgmq );                         // Interfaces to get, + results

    if ( SUCCEEDED( hres ) && ppv != 0 )
        *ppv = (LPVOID) (rgmq[ 0 ].pItf);

    return hres;
}
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