ATL / WTL / STL

if (m_spInPlaceSite->GetWindow(&hwndParent) == S_OK)
{
    m_spInPlaceSite->GetWindowContext(&spInPlaceFrame,
        &spInPlaceUIWindow, &rcPos, &rcClip, &frameInfo);

    if (!m_bWndLess)
    {
        if (m_hWndCD)
        {
            ShowWindow(m_hWndCD, SW_SHOW);
            if (!::IsChild(m_hWndCD, ::GetFocus()))
                ::SetFocus(m_hWndCD);
        }
        else
        {
            HWND h = CreateControlWindow(hwndParent, rcPos);
            </code><FONT color=red>ATLASSERT(h != NULL); // will assert if creation failed</font><code>
            ATLASSERT(h == m_hWndCD);
            h;  // avoid unused warning
        }
    }

    pIPO->SetObjectRects(&rcPos, &rcClip);
}

---------------------------
Microsoft Visual C++ Debug Library
---------------------------
Debug Assertion Failed!

Program: D:\Work\vbtemp5\Debug\Project1.exe
File: c:\program files\microsoft visual studio\vc98\atl\include\atlctl.h
Line: 842

Expression: h != 0

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)
---------------------------
Abort   Retry   Ignore   
---------------------------

[<br />
	uuid("09GGGB2E-BA1D-4349-900A-DA8F5B8DD24C")<br />
] <br />
enum OmniTrackerCommands<br />
{<br />
	kOTC_Startup	= 0, <br />
	kOTC_Query	= 1<br />
} OmniTrackerCommands;<br />
<br />
// IDataTransmitter<br />
[<br />
	object,<br />
	uuid("F17B0F10-6FF5-4C14-A4A8-C513ACGGGE4A"),<br />
	dual,	helpstring("IDataTransmitter Interface"),<br />
	pointer_default(unique)<br />
]<br />
__interface IDataTransmitter : IDispatch<br />
{<br />
	[id(1), helpstring("method Send")] HRESULT Send([in] OmniTrackerCommands command);<br />
};