|
OleSetAutoConvert
Tags an object for automatic conversion to a different class when the object
is loaded.
HRESULT OleSetAutoConvert(
REFCLSID clsidOld,
| //CLSID to be converted
| REFCLSID clsidNew
| //New CLSID after conversion
| );
|
|
Parameters
clsidOld
Specifies the CLSID of the object class to be converted.
clsidNew
Specifies the CLSID of the object class that should replace clsidOld. This new CLSID replaces any existing auto-conversion information in the
registration database for clsidOld. If this value is CLSID_NULL, any existing auto-conversion information for clsidOld is removed from the registration database.
Return Values
S_OK
Indicates the object was tagged successfully.
REGDB_E_CLASSNOTREG
Indicates the CLSID is not properly registered in the registration database.
REGDB_E_READREGDB
Indicates error reading from the registration database.
REGDB_E_WRITEREGDB
Indicates error writing to the registration database.
REGDB_E_KEYMISSING
Indicates cannot read a key from the registration database.
E_OUTOFMEMORY
Indicates the auto-conversion cannot be completed due to a lack of memory.
E_INVALIDARG
Indicates one or more arguments are invalid.
E_UNEXPECTED
Indicates an unexpected error occurred.
Comments
The OleSetAutoConvert function sets the entry for AutoConvertTo entry for clsidOld in the registration database. This function does no validation of whether an
appropriate registration database entry for clsidNew currently exists. When it is called, the OleSetAutoConvert function records the new CLSID for the object under the AutoConvertTo subkey
in the registration database for clsidOld.
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. You can write the setup program to tag a class
of objects for automatic conversion to a different class of objects.
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.
When installing a new CLSID, setup programs may call OleSetAutoConvert for various clsidOld values for older versions of their applications. They also should call OleSetAutoConvert, specifying the new class as the clsidOld parameter, and setting the clsidNew parameter to CLSID_NULL to remove any existing conversion for the new class.
The OleSetAutoConvert function creates the required entry in the registration database. These
entries appear in the registration database as subkeys of the CLSID key:
CLSID\{clsid}=MainUserTypeName\AutoConvertTo = clsid
See Also
OleDoAutoConvert
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