When the Edit|<Object>|Convert... menu item is selected for an OLE object
that is embedded within a Microsoft Excel document, the Convert dialog box
does not appear.
Back to the top
Microsoft Excel displays the Convert dialog for an object only if
WriteFmtUserTypeStg has been used to write out a clipboard format and
user-readable name for the contents of the object. The MFC libraries do not
call this function when creating or saving OLE objects.
Back to the top
Call WriteFmtUserTypeStg in the Serialize method of your server's document
class.
Back to the top
This behavior is by design.
Back to the top
WriteFmtUserTypeStg should be called as part of your server's
implementation of IPersistStorage::InitNew and IPersistStorage::Save. By
default, MFC OLE server applications do not call WriteFmtUserTypeStg in
their implementation of IPersistStorage::InitNew and IPersistStorage::Save.
One simple way to achieve this functionality in an MFC application is to
make the call to WriteFmtUserTypeStg in the Serialize method of the
server's document class.
Back to the top
Steps to Add a Call to WriteFmtUserTypeStg
| 1. | Provide a private clipboard format for your object.
WriteFmtUserTypeStg serializes a clipboard format and user-readable name
for the contents of an object to its storage. The HIERSVR sample shows
how to provide a private clipboard format for your object if you do not
already have one.
|
| 2. | Add the DoWriteFmtUserTypeStg helper function to your document class.
This helper function is used to encapsulate retrieving the clipboard
format and user-readable name when calling WriteFmtUserTypeStg. The code
in the "Sample Code" section of this article shows how to implement this
function for the HIERSVR sample.
|
| 3. | Modify the server document's Serialize() method and add a call to the
DoWriteFmtUserTypeStg helper function, as shown in the following sample
code.
|
Back to the top
Sample Code
void CServerDoc::DoWriteFmtUserTypeStg(LPSTORAGE lpStorage)
{
LPOLEOBJECT lpObject = (LPOLEOBJECT)GetInterface(&IID_IOleObject);
ASSERT(lpObject != NULL);
CLSID clsid;
lpObject->GetUserClassID(&clsid);
LPTSTR pszUserType = NULL;
OleRegGetUserType(clsid, USERCLASSTYPE_FULL, (LPOLESTR
*)&pszUserType);
if (pszUserType)
{
WriteClassStg(lpStorage, clsid);
WriteFmtUserTypeStg(lpStorage, m_cfPrivate,
(LPOLESTR)pszUserType);
CoTaskMemFree(pszUserType);
}
}
void CServerDoc::Serialize(CArchive& ar)
{
ASSERT(m_pRoot != NULL);
if(IsEmbedded() && ar.IsStoring())
{
ASSERT(m_lpRootStg != NULL);
DoWriteFmtUserTypeStg(m_lpRootStg);
}
SerializeFontInfo(ar);
m_pRoot->Serialize(ar);
}
Back to the top
