Returns the new CLSID to which the specified object can be automatically
converted. This conversion CLSID is stored in the registration database.
| REFCLSID clsidOld,
||//CLSID of the object to be converted
| LPCLSID pClsidNew
||//Pointer to new CLSID for object being converted
Specifies the CLSID for an object that can be automatically converted.
Points to location where the new CLSID, if any, is returned. The original
, is automatically converted to this new CLSID when the object is opened. If
there is no auto-conversion CLSID stored in the registration database, the value clsidOld
is returned; the pClsidNew
parameter cannot be NULL.
Indicates that a value was successfully returned through the pclsidNew
Indicates the clsidOld
CLSID is not properly registered in the registration database.
Indicates error reading the registration database.
Indicates auto convert is not active or there was no registration entry for
Indicates the value was not returned due to a lack of memory.
Indicates one or more arguments are invalid.
Indicates an unexpected error occurred.
This function returns the AutoConvertTo entry in the registration database for
the specified object, which specifies whether objects of a given CLSID are to
be automatically converted to a new CLSID. This is usually set up to convert
files created by older versions of an application to the current version. If
there is no AutoConvertTo entry, this function returns the value of clsidOld
. This function is typically called by the OleDoAutoConvert
function to determine if the object specified needs to be converted. If the
object has an AutoConvertTo entry, then it will be converted.
Automatic conversion is typically set up during the installation of an object
application. The setup program can take advantage of the AutoConvertTo subkey
to tag a class of objects for automatic conversion to a different class of
For example, a new version of a spreadsheet application may need to convert
spreadsheets that were created with earlier versions of the application. These
earlier version spreadsheet objects have a different CLSID than the new version.
The setup program for the new version of the spreadsheet application tags
objects in the registration database that have the old CLSID so they are
automatically updated when they are loaded.
To tag the old spreadsheet objects, the setup program calls the OleSetAutoConvert
function and passes it to the CLSIDs of the source and destination object
classes. The OleSetAutoConvert
function creates the required entry in the registration database. These
entries appear in the registration database as subkeys of the CLSID key:
\AutoConvertTo = clsid
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