This function supplies the class identifier associated with the specified file name.
At a Glance
| Header file: | Objbase.h |
| Windows CE versions: | 2.10 and later |
Syntax
WINOLEAPI GetClassFile ( LPCWSTR szFileName, CLSID * pclsid);
Parameters
szFileName
[in] Null-terminated string that contains the file name for which you are requesting the associated class identifier.
pclsid
[out] Pointer to the location where the associated class identifier is written on return.
Return Values
One of the values described in the following table is returned.
| Value | Description |
| S_OK | Indicates the class identifier was successfully supplied. |
| MK_E_CANTOPENFILE | Indicates unable to open the specified filename. |
| MK_E_INVALIDEXTENSION | Indicates the specified extension in the registry is invalid. |
This function can also return any file system errors.
Remarks
When given a filename, the GetClassFile function finds the class identifier associated with that file. Examples of its use are in OleCreateFromFile, which is passed a file name and requires an associated class identifier, and in the OLE implementation of IMoniker::BindToObject, which, when a link to a file-based document is activated, calls GetClassFile to locate the object application that can open the file.
The GetClassFile function searches for the File Extension key in the registry that corresponds to the .ext portion of the filename. If the database entry contains a valid class identifier, this function returns that class identifier.
If the File Extension key is not found or the database entry contains an invalid class identifier, the function returns MK_E_INVALIDEXTENSION.
See Also