Hi I've been working on an application for so long now. Now that I have gotten rid of all compiler errors, I have a runtime error. It is as follows: Microsoft Visual C++ Debug Library Debug Assertion Failed! Program: ... File: C:\program files\microsoft platform sdk\include\atl\atlbase.h Line: 868 Expression: p!=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) This error is being caused by the following statement in my code: HRESULT hr = m_spWB->QueryInterface(IID_IConnectionPointContainer, (void**)&m_spCPC); When I click retry, a breakpoint is created by the application in the following code of atlbase.h: //The assert on operator& usually indicates a bug. If this is really //what is needed, however, take the address of the p member explicitly. T** operator&() { ATLASSERT(p==NULL); return &p } _NoAddRefReleaseOnCComPtr<T>* operator->() const { ATLASSERT(p!=NULL); return (_NoAddRefReleaseOnCComPtr<T>*)p; } T* operator=(T* lp) { return (T*)AtlComPtrAssign((IUnknown**)&p, lp); } The breakpoint points to line 10 of the code above, where is says ATLASSERT(p!=NULL); Can someone please help me understand why this error is showing up and how I can fix it. Thank you.

You mean I would have to call Release on the m_spWB com object. This object is actually a web browser control. Wouldn't this just delete the com object which I wish to use in the query interface statement?

It works now. I am not getting that error anymore. I paid a little more attention to why the value of the com object was null when I expected it to be something else. I was using the com object before I had initialized it. So, now I initialize it and then use it with query interface and it works.

Thanks for pointing out my mistake.