Microsoft KB Archive/167949

= FIX: OnWindowMessage Returns BOOL for HRESULT =

Article ID: 167949

Article Last Modified on 10/24/2003

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APPLIES TO


 * Microsoft ActiveX Template Library 2.0
 * Microsoft ActiveX Template Library 2.1
 * Microsoft ActiveX Template Library 3.0

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This article was previously published under Q167949





SYMPTOMS
ATL[ASCII 146]s IOleInPlaceObjectWindowless::OnWindowMessage implementation mistakenly returns a BOOL instead of an HRESULT indicating failure when it has actually succeeded.



CAUSE
IOleInPlaceObjectWindowless::OnWindowMessage should return S_OK if processed, otherwise S_FALSE.

ATL passes on the return from value pT->ProcessWindowMessage, which returns TRUE if processed, otherwise FALSE.



RESOLUTION
Change the following line of source code in AtlCtl.h line 1829: return pT->ProcessWindowMessage(pT->m_hWnd, msg, wParam,        lParam, *plResult); to: if (pT->ProcessWindowMessage(pT->m_hWnd, msg, wParam, lParam, *plResult)) return S_OK; else return S_FALSE;



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual Studio 97 Service Pack 1.

For additional information about the Visual Studio 97 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Chuck Bell, Microsoft Corporation

Additional query words: BOOL HRESULT OnWindowMessage

Keywords: kbbug kbfix kbvs97sp1fix kbatlwc kblocalsvr KB167949

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