lpszProgID

[in] Pointer to the ProgID whose CLSID is requested.

pclsid

[out] Pointer to the retrieved CLSID on return.

S_OK

The CLSID was retrieved successfully.

CO_E_CLASSSTRING

The registered CLSID for the ProgID is invalid.

REGDB_E_WRITEREGDB

An error occurred writing the CLSID to the registry. See "Remarks" below.

Given a ProgID, CLSIDFromProgID looks up its associated CLSID in the registry. If the ProgID cannot be found in the registry, CLSIDFromProgID creates an OLE 1 CLSID for the ProgID and a CLSID entry in the registry. Because of the restrictions placed on OLE 1 CLSID values, CLSIDFromProgID and CLSIDFromString are the only two functions that can be used to generate a CLSID for an OLE 1 object.

CLSIDFromProgID never triggers an automatic installation of missing classes.

For an explanation of the requirement values, see Requirements (COM).

Windows NT/2000/XP: Requires Windows NT 3.1 or later.

Windows 95/98: Requires Windows 95 or later.

Header: Declared in objbase.h.

Library: Use ole32.lib.

Reference