IHTMLDocument2::get_parentWindow() fails

Hi. Don't know if this is the forum for COM related questions, but it still is Windows programming. I Tried to get the IHTMLWindow2 interface of an IHTMLDocument2 using get_parentWindow(), but the function crashed my application.

Code:

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IHTMLWindow2 *parentWindow = NULL;
//webBrowser is a valid IWebBrwoser2 obejct
webBrowser->get_Document(&iDispatchDocument);

iDispatchDocument->QueryInterface(IID_IHTMLDocument2, (void**)&htmlDocument);
htmlDocument->get_parentWindow(&parentWindow);

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I am sure that htmlDocument is a valid pointer, since I can call its other functions (I can even get all the elements).

What could be the cause for this crash? Thank you for any help.

Are you not checking HRESULT return values?

Check for errors and look up the meaning of any error codes.

gg

Thanks for your reply, but I can't check the return value of get_parentWindow, because the function doesn't return before crashing the application. webBrowser->get_Document and iDispatchDocument->QueryInterface both return S_OK.

were you able to solve this? :( i am really desperate for at least some information regarding my problem.

a completely answered thread for this one would definitely help me out..