这个函数为什么不能两次插入相同的HBITMAP？望高手指点一二。谢谢

Question

void CRichEditCtrlEx::InsertBitmap(HBITMAP hBitmap)
{
STGMEDIUM stgm;
stgm.tymed = TYMED_GDI;    // Storage medium = HBITMAP handle
stgm.hBitmap = hBitmap;
stgm.pUnkForRelease = NULL; // Use ReleaseStgMedium

FORMATETC fm;
fm.cfFormat = CF_BITMAP; // Clipboard format = CF_BITMAP
fm.ptd = NULL; // Target Device = Screen
fm.dwAspect = DVASPECT_CONTENT; // Level of detail = Full content
fm.lindex = -1; // Index = Not applicaple
fm.tymed = TYMED_GDI; ////创建输入数据源
IStorage *pStorage;
    
     ///分配内存
LPLOCKBYTES lpLockBytes = NULL;
SCODE sc = ::CreateILockBytesOnHGlobal(NULL, TRUE, &lpLockBytes);
if (sc != S_OK)
AfxThrowOleException(sc);
ASSERT(lpLockBytes != NULL);

sc = ::StgCreateDocfileOnILockBytes(lpLockBytes,
STGM_SHARE_EXCLUSIVE|STGM_CREATE|STGM_READWRITE, 0, &pStorage);
if (sc != S_OK)
{
VERIFY(lpLockBytes->Release() == 0);
lpLockBytes = NULL;
AfxThrowOleException(sc);
}
ASSERT(pStorage != NULL); COleDataSource *pDataSource = new COleDataSource;
pDataSource->CacheData(CF_BITMAP, &stgm);
LPDATAOBJECT lpDataObject = 
(LPDATAOBJECT)pDataSource->GetInterface(&IID_IDataObject); ///获取RichEdit的OLEClientSite
LPOLECLIENTSITE lpClientSite;
this->GetIRichEditOle()->GetClientSite( &lpClientSite );
///创建OLE对象
IOleObject *pOleObject;
sc = OleCreateStaticFromData(lpDataObject,IID_IOleObject,OLERENDER_FORMAT,
&fm,lpClientSite,pStorage,(void **)&pOleObject);  //这里异常了
if(sc!=S_OK)
{
delete pDataSource;
AfxThrowOleException(sc);
} ///插入OLE对象 REOBJECT reobject;
ZeroMemory(&reobject, sizeof(REOBJECT));
reobject.cbStruct = sizeof(REOBJECT);

CLSID clsid;
sc = pOleObject->GetUserClassID(&clsid);
if (sc != S_OK)
{
delete pDataSource;
AfxThrowOleException(sc);
} reobject.clsid = clsid;
reobject.cp = REO_CP_SELECTION;
reobject.dvaspect = DVASPECT_CONTENT;
reobject.poleobj = pOleObject;
reobject.polesite = lpClientSite;
reobject.pstg = pStorage; HRESULT hr = this->GetIRichEditOle()->InsertObject( &reobject );
delete pDataSource;
}

Answer 1

sc = OleCreateStaticFromData(lpDataObject,IID_IOleObject,OLERENDER_FORMAT,
&fm,lpClientSite,pStorage,(void **)&pOleObject);  
//第二次创建相同的Bitmap的OleObject对象时出错

Answer 2

lpDataObject是静态的，所以需要先释放后才能重新create

Answer 3

不太熟悉，不过我认为可能是
OleCreateStaticFromData应该有一个反函数，提供释放功能，在下次使用pOleObject时应该在前面有一个释放的操作。