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OleDoAutoConvert
Automatically converts an object to a new class if conversion is needed.
HRESULT OleDoAutoConvert(
IStorage * pStg,
| //Pointer to storage object to be converted
| LPCLSID pClsidNew
| //Points to new CLSID of converted object
| );
|
|
Parameters
pStg
Points to the persistent storage of the object to be converted.
pClsidNew
Points to the new CLSID for the object being converted. If there was no
automatic conversion, this may be the same as the original class.
Return Values
S_OK
Indicates no conversion is needed or a conversion was successfully completed.
REGDB_E_KEYMISSING
Indicates cannot read a key from the registration database.
E_OUTOFMEMORY
Indicates the conversion was not successful due to a lack of memory.
E_INVALIDARG
Indicates one or more arguments are invalid.
E_UNEXPECTED
Indicates an unexpected error occurred.
See also the OleGetAutoConvert function for other error return values.
See the IStorage::OpenStorage and IStorage::OpenStream methods for possible errors when accessing storage and stream objects.
See also the IStream interface for other error return values when it is not possible to determine
the existing CLSID or when it is not possible to update the storage object with
new information.
Comments
This function automatically converts an object if automatic conversion has
previously been specified in the registry by the OleSetAutoConvert function. Object conversion means that the object is permanently associated
with a new CLSID. Automatic conversion is typically specified by the setup
program for a new version of an object application so that objects created by its
older versions can be automatically updated.
A container application that supports object conversion should call the OleDoAutoConvert function each time it loads an object. If the container uses the OleLoad helper function, it need not call OleDoAutoConvert explicitly because OleLoad calls it internally.
The OleDoAutoConvert function first determines whether any conversion is required by calling the OleGetAutoConvert function. If no conversion is required, the function returns S_OK. Otherwise,
the storage object is modified and converted by activating the new object
application. The new object application reads the existing data format but when the
object is saved, the new native format for the object application is saved.
If the object to be automatically converted is an OLE 1 object, the ItemName
string is stored in a stream called "\1Ole10ItemName." If this stream does not
exist, the object's item name is NULL.
The storage object must be in the unloaded state when OleDoAutoConvert is called.
See Also
OleSetAutoConvert
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