BOOL COleClientItem::Reload()
{
// first, close the object
Close();
// release any pointers we have to the object
RELEASE(m_lpObject);
RELEASE(m_lpViewObject);
// then reload the object with OleLoad and finish creation process
BOOL bResult = FinishCreate(::OleLoad(m_lpStorage, IID_IUnknown,
NULL, (LPLP)&m_lpObject));
ASSERT_VALID(this);
return bResult;
}
BOOL COleClientItem::ConvertTo(REFCLSID clsidNew)
{
ASSERT_VALID(this);
ASSERT(m_lpObject != NULL);
// first, close the object
Close();
// convert it
m_scLast = _AfxOleDoConvert(m_lpStorage, clsidNew);
if (FAILED(m_scLast))
return FALSE;
// save IOleObject and IViewObject2 pointers
LPOLEOBJECT lpObject = m_lpObject;
LPVIEWOBJECT2 lpViewObject = m_lpViewObject;
DWORD dwConnection = m_dwConnection;
// NULL out IOleObject and IViewObject2 cached pointers
m_lpObject = NULL;
m_lpViewObject = NULL;
m_dwConnection = 0;
// then load the new object from the new storage
BOOL bResult = FinishCreate(::OleLoad(m_lpStorage, IID_IUnknown,
NULL, (LPLP)&m_lpObject));
if (bResult)
{
RELEASE(lpObject);
RELEASE(lpViewObject);
}
else
{
m_lpObject = lpObject;
m_lpViewObject = lpViewObject;
m_dwConnection = dwConnection;
UpdateItemType();
}
ASSERT_VALID(this);
return bResult;
}
/////////////////////////////////////////////////////////////////////////////
//功 能：创建或者导入控件项目
/////////////////////////////////////////////////////////////////////////////
BOOL CCtrlItem::CreateOrLoad(REFCLSID clsid,
REFIID iidPersistanceMedium, IUnknown* pPersistanceMedium)
{
HRESULT hResult;
BOOL bSuccess;
IPersistStreamInitPtr pPersistStreamInit;
IPersistStreamPtr pPersistStream;
IPersistStoragePtr pPersistStorage;
IStreamPtr pStream;
IStoragePtr pStorage;
ASSERT(m_lpObject == NULL);
ASSERT(m_pDocument != NULL);
m_dwItemNumber = GetNewItemNumber();
GetItemStorage();
ASSERT(m_lpStorage != NULL);
m_bExtendedControl = TRUE;
hResult = CExtendedControl::CreateInstance(clsid, this, NULL,
IID_IOleObject, (void**)&m_lpObject);
if (FAILED(hResult))
{
m_bExtendedControl = FALSE;
hResult = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER|
CLSCTX_INPROC_HANDLER|CLSCTX_LOCAL_SERVER, IID_IOleObject,
(void**)&m_lpObject);
if (SUCCEEDED(hResult))
{
TRACE("Could not aggregate on the control, so it won't support extended properties.\n");
}
}
if (m_bExtendedControl)
{
m_pExtendedControl = m_lpObject;
ASSERT(m_pExtendedControl != NULL);
}
//设置客户站点
if (SUCCEEDED(hResult))
{
m_lpObject->GetMiscStatus(DVASPECT_CONTENT, &m_dwMiscStatus);
if (m_dwMiscStatus&OLEMISC_SETCLIENTSITEFIRST)
{
//GetClientSite 得到接口
hResult = m_lpObject->SetClientSite(GetClientSite());
if (FAILED(hResult))
{
TRACE("SetClientSite failed.\n");
}
}
}
//初始化或装载对象的状态
if (SUCCEEDED(hResult))
{
if( iidPersistanceMedium == IID_NULL )
{
pPersistStreamInit = m_lpObject;
if (pPersistStreamInit != NULL)
{
hResult = pPersistStreamInit->InitNew();
if (hResult == E_NOTIMPL)
{
//没有实现 InitNew 为 Ok。
hResult = S_OK;
}
}
else
{
pPersistStorage = m_lpObject;
if (pPersistStorage != NULL)
{
hResult = pPersistStorage->InitNew(m_lpStorage);
}
else
{
// 假设控件不支持持久性。
hResult = S_OK;
}
}
}
else if (iidPersistanceMedium == IID_IStream)
{
pStream = pPersistanceMedium;
ASSERT(pStream != NULL);
pPersistStreamInit = m_lpObject;
if (pPersistStreamInit != NULL)
{
hResult = pPersistStreamInit->Load(pStream);
}
else
{
pPersistStream = m_lpObject;
if (pPersistStream != NULL)
{
hResult = pPersistStream->Load(pStream);
}
else
{
hResult = E_NOINTERFACE;
}
}
}
else if (iidPersistanceMedium == IID_IStorage)
{
pStorage = pPersistanceMedium;
ASSERT(pStorage != NULL);
pPersistStorage = m_lpObject;
if (pPersistStorage != NULL)
{
hResult = pStorage->CopyTo(0, NULL, NULL, m_lpStorage);
if (SUCCEEDED(hResult))
{
hResult = pPersistStorage->Load(m_lpStorage);
}
}
else
{
hResult = E_NOINTERFACE;
}
}
}
if (SUCCEEDED(hResult))
{
if (!(m_dwMiscStatus&OLEMISC_SETCLIENTSITEFIRST))
{
hResult = m_lpObject->SetClientSite(GetClientSite());
if (FAILED(hResult))
{
TRACE("SetClientSite failed.\n");
}
}
}
//SetClientSite 必须被使用
bSuccess = FinishCreate(hResult);
return bSuccess;
}
