m_spInPlaceSite 的区别m_spClientSite

Question

问题1:m_spClientSite是在CComControlBase::IOleObject_SetClientSite中初始化
m_spInPlaceSite 在什么时候初始化
问题2:GIF98控件不传窗口进去,怎么让他的m_HWND 不为空

Answer 1

1)ATL源码inline HRESULT CComControlBase::InPlaceActivate(LONG iVerb, const RECT* /*prcPosRect*/)
{
HRESULT hr; if (m_spClientSite == NULL)
return S_OK; CComPtr<IOleInPlaceObject> pIPO;
ControlQueryInterface(__uuidof(IOleInPlaceObject), (void**)&pIPO);
ATLASSERT(pIPO != NULL); if (!m_bNegotiatedWnd)
{
if (!m_bWindowOnly)
// Try for windowless site
hr = m_spClientSite->QueryInterface(__uuidof(IOleInPlaceSiteWindowless), (void **)&m_spInPlaceSite); if (m_spInPlaceSite)
{
m_bInPlaceSiteEx = TRUE;
// CanWindowlessActivate returns S_OK or S_FALSE
if ( m_spInPlaceSite->CanWindowlessActivate() == S_OK )
{
m_bWndLess = TRUE;
m_bWasOnceWindowless = TRUE;
}
else
{
m_bWndLess = FALSE;
}
}
else
{
m_spClientSite->QueryInterface(__uuidof(IOleInPlaceSiteEx), (void **)&m_spInPlaceSite);
if (m_spInPlaceSite)
m_bInPlaceSiteEx = TRUE;
else
hr = m_spClientSite->QueryInterface(__uuidof(IOleInPlaceSite), (void **)&m_spInPlaceSite);
}
} ATLASSUME(m_spInPlaceSite);
if (!m_spInPlaceSite)
return E_FAIL; m_bNegotiatedWnd = TRUE; if (!m_bInPlaceActive)
{ BOOL bNoRedraw = FALSE;
if (m_bWndLess)
m_spInPlaceSite->OnInPlaceActivateEx(&bNoRedraw, ACTIVATE_WINDOWLESS);
else
{
if (m_bInPlaceSiteEx)
m_spInPlaceSite->OnInPlaceActivateEx(&bNoRedraw, 0);
else
{
hr = m_spInPlaceSite->CanInPlaceActivate();
// CanInPlaceActivate returns S_FALSE or S_OK
if (FAILED(hr))
return hr;
if ( hr != S_OK )
{
   // CanInPlaceActivate returned S_FALSE.
   return( E_FAIL );
}
m_spInPlaceSite->OnInPlaceActivate();
}
}
} m_bInPlaceActive = TRUE; // get location in the parent window,
// as well as some information about the parent
//
OLEINPLACEFRAMEINFO frameInfo;
RECT rcPos, rcClip;
CComPtr<IOleInPlaceFrame> spInPlaceFrame;
CComPtr<IOleInPlaceUIWindow> spInPlaceUIWindow;
frameInfo.cb = sizeof(OLEINPLACEFRAMEINFO);
HWND hwndParent;
if (m_spInPlaceSite->GetWindow(&hwndParent) == S_OK)
{
m_spInPlaceSite->GetWindowContext(&spInPlaceFrame,
&spInPlaceUIWindow, &rcPos, &rcClip, &frameInfo); if (!m_bWndLess)
{
if (m_hWndCD)
ShowWindow(m_hWndCD, SW_SHOW);
else
{
HWND h = CreateControlWindow(hwndParent, rcPos);
ATLASSERT(h != NULL); // will assert if creation failed
ATLASSERT(h == m_hWndCD);
if(h == NULL)
return E_FAIL;
}
} pIPO->SetObjectRects(&rcPos, &rcClip);
} CComPtr<IOleInPlaceActiveObject> spActiveObject;
ControlQueryInterface(__uuidof(IOleInPlaceActiveObject), (void**)&spActiveObject); // Gone active by now, take care of UIACTIVATE
if (DoesVerbUIActivate(iVerb))
{
if (!m_bUIActive)
{
m_bUIActive = TRUE;
hr = m_spInPlaceSite->OnUIActivate();
if (FAILED(hr))
{
m_bUIActive = FALSE;
return hr;
} SetControlFocus(TRUE);
// set ourselves up in the host.
//
if (spActiveObject)
{
if (spInPlaceFrame)
spInPlaceFrame->SetActiveObject(spActiveObject, NULL);
if (spInPlaceUIWindow)
spInPlaceUIWindow->SetActiveObject(spActiveObject, NULL);
} if (spInPlaceFrame)
spInPlaceFrame->SetBorderSpace(NULL);
if (spInPlaceUIWindow)
spInPlaceUIWindow->SetBorderSpace(NULL);
}
} m_spClientSite->ShowObject(); return S_OK;
}
2）GIF98控件不熟悉

Answer 2

楼上那位大哥:if (m_spClientSite == NULL)
        return S_OK;
那不是m_spClientSite 没能初始化了,我现在的控件就是为NULL,请深一步,谢谢

Answer 3

m_spClientSite在CComControlBase::IOleObject_SetClientSite中初始化当然是调用着调用SetClientSite来初始化啦