C / C++ / MFC

void CMyDlg::OnBeforeNavigate2Explorer1(LPDISPATCH pDisp,
VARIANT FAR* URL,
VARIANT FAR* Flags,
VARIANT FAR* TargetFrameName,
VARIANT FAR* PostData,
VARIANT FAR* Headers,
BOOL FAR* Cancel)
{

if( is_an_unprocessed_file( URL ))
{
// given the URL I create the output I want to show
CreateMyProcessedFile(URL,"processed.html");

// cancel navigation of the original file
*Cancel = (VARIANT_BOOL) 0xffff;

// fire navigation to the processed file
m_browser.Navigate("processed.html",Flags,TargetFrameName,PostData,Headers);
return;
}
// if we are here IE is going to visit a processed file: it's ok.
*Cancel = (VARIANT_BOOL) 0x0;
}