在BHO中拦截BeforeNavigate2

[bright2k]

我在BHO中拦截BeforeNavigate2事件，
修改了事件的url参数，为什么不能实现地址转向？？
部分代码如下：
STDMETHODIMP CAssistMain::Invoke(DISPID dispidMember, REFIID riid,
LCID lcid, WORD wFlags, DISPPARAMS* pdispparams, VARIANT* pvarResult,
EXCEPINFO* pexcepinfo, UINT* puArgErr)
{
if (!pdispparams)
return E_INVALIDARG;
HRESULT hr = S_OK;
switch(dispidMember)
{
/*
* The parameters for this DISPID are as follows:
* [0]: Cancel flag - VT_BYREF|VT_BOOL
* [1]: HTTP headers - VT_BYREF|VT_VARIANT
* [2]: Address of HTTP POST data - VT_BYREF|VT_VARIANT
* [3]: Target frame name - VT_BYREF|VT_VARIANT
* [4]: Option flags - VT_BYREF|VT_VARIANT
* [5]: URL to navigate to - VT_BYREF|VT_VARIANT
* [6]: An object that evaluates to the top-level or frame
* WebBrowser object corresponding to the event.
*/
case DISPID_BEFORENAVIGATE2:
{
CComBSTR bstrUrl((*(pdispparams->rgvarg[5].pvarVal)).bstrVal);
CComBSTR bstrNewUrl(_T("http://www.google.com/"));
bstrNewUrl += bstrUrl;
(*(pdispparams->rgvarg[5].pvarVal)).bstrVal = bstrNewUrl.Detach();
}
break;

.......
}

[kingzai]

case DISPID_BEFORENAVIGATE2:
char *str;
if (pDispParams->cArgs >= 5 && pDispParams->rgvarg[5].vt == (VT_BYREF|VT_VARIANT))
{
CComVariant varURL(*pDispParams->rgvarg[5].pvarVal);
varURL.ChangeType(VT_BSTR);
//转化要访问的网址为char *型
str = OLE2A(varURL.bstrVal);
}

[蒋晟]

要cancel之后触发浏览器的Navigate2方法才行

[duwenyong]

CComBSTR newURL = L"http://www.google.com/";
m_spWebBrowser2->Stop();
m_spWebBrowser2->Navigate(newURL, &pDispParams->rgvarg[4],&pDispParams->rgvarg[3],
&pDispParams->rgvarg[2],&pDispParams->rgvarg[1]);