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GetConvertStg
Returns the current value of the convert bit for the specifed storage object.
HRESULT GetConvertStg(
IStorage * pStg
| //Points to the storage object
| );
|
|
Parameter
pStg
Points to the storage object from which to retrieve the convert bit.
Return Values
S_OK
Indicates the convert bit is set to TRUE.
S_FALSE
Indicates the convert bit is cleared (FALSE).
STG_E_ACCESSDENIED
Indicates cannot access the storage object.
IStorage::OpenStream, IStorage::OpenStorage, and IStream::Read storage and stream access errors.
Comments
This function is used by object applications that support converting the
object from one format to another. The object application must be able to read the
storage object using the format of its previous CLSID and write the object using
the format of its new CLSID to support converting the object. For example, a
spreadsheet created by one application can be converted to the format used by a
different application.
The convert bit is set by a call to the SetConvertStg function. A container application can call this function on the request of an
end user, or a setup program can call it when installing a new version of an
application. An end user requests converting an object through the Convert To
dialog box. When an object is converted, the new CLSID is permanently assigned to
the object, so the object is subsequently associated with the new CLSID.
Then, when the object is activated, the object application calls the GetConvertStg function to retrieve the value of the convert bit from the storage object. If
the bit is set, the object's CLSID has been changed, and the object
application must read the old format and write the new format for the storage object.
After retrieving the bit value, the object application should clear the
convert bit by calling the SetConvertStg function with its fConvert parameter set to FALSE.
See Also
SetConvertStg
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