Important: |
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This function supplies the class identifier associated with the specified file name.
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 Value
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 file name. |
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 file name, the GetClassFilefunction finds the class identifier associated with that file. An example of its use is in the OLE implementation of IMoniker::BindToObject. This calls GetClassFileto locate the object application that can open the file when a link to a file-based document is activated.
The GetClassFilefunction searches for the File Extension key in the registry that corresponds to the . extportion of the file name. 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.
To determine whether the platform supports this function, see Determining Supported COM APIs.
Requirements
Header | objbase.h |
Library | ole32.lib |
Windows Embedded CE | Windows CE 2.10 and later |
Windows Mobile | Windows Mobile Version 5.0 and later |