Article ID: 247273
Article Last Modified on 10/2/2003
APPLIES TO
- Microsoft ActiveX Template Library 2.0
- Microsoft ActiveX Template Library 2.1
- Microsoft ActiveX Template Library 3.0
This article was previously published under Q247273
SYMPTOMS
According to documentation for IOleObject::DoVerb, unknown positive verbs should be treated as the primary verb and OLEOBJ_S_INVALIDVERB should be returned. ATL's implementation of IOleObject::DoVerb does nothing for positive verbs and returns E_NOTIMPL.
CAUSE
This is a bug in the ATL implementation of IOleObject::DoVerb.
RESOLUTION
To correct this behavior, you can override the ATL function IOleObjectImpl::DoVerb. You need to override the IOleObjectImpl::DoVerb function for every ATL object that needs to have the correct processing for IOleObject::DoVerb. Because this may need to be done for more than one ATL COM object in your project, it is recommended that you create a new template class derived from IOleObjectImpl. You can use the following steps to accomplish this:
- Create a new header file and insert it into your ATL project. Give the header file the name MyIOleObjectImpl.h.
Open MyIOleObjectImpl.h created in step 1 and copy the following code into the file:
#ifndef MYIOLEOBJECTIMPL_H #define MYIOLEOBJECTIMPL_H #include <atlctl.h> template <class T> class IMyOleObjectImpl : public IOleObjectImpl<T> { public: STDMETHODIMP DoVerb(LONG iVerb, LPMSG pMsg, IOleClientSite* pActiveSite, LONG lindex, HWND hwndParent, LPCRECT lprcPosRect ) { if (iVerb > 0) { iVerb = OLEIVERB_PRIMARY; IOleObjectImpl<T>::DoVerb(iVerb, pMsg, pActiveSite, lindex, hwndParent, lprcPosRect); return OLEOBJ_S_INVALIDVERB; } return IOleObjectImpl<T>::DoVerb(iVerb, pMsg, pActiveSite, lindex, hwndParent, lprcPosRect); } }; #endif
- Save and close MyIOleObjectImpl.h.
Open your ATL COM object header file and add the following code before the class declaration:
#include "MyIOleObjectImpl.h"
Inside of your ATL COM object class derivation, change the existing derivation from IOleObjectImpl to IMyOleObjectImpl. The code should appear similar to the following:
class ATL_NO_VTABLE CATLCONTROLObj1 : // Rest of classes omitted for brevity. // public IOleObjectImpl<CATLCONTROLObj1>, public IMyOleObjectImpl<CATLCONTROLObj1>, public CComCoClass<CATLCONTROLObj1, &CLSID_ATLCONTROLObj1> { // Rest of code omitted for brevity. };
- Save your ATL COM object header file and rebuild the project.
After performing these steps, you should notice that IOleObject::DoVerb is implemented correctly when a positive verb is passed.
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
REFERENCES
Please see the IOleObject::DoVerb documentation in MSDN.
Keywords: kbbug kbctrlcreate KB247273