Important:
This is retired content. This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This content may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.
A version of this page is also available for
4/8/2010

This function retrieves the CLSID of the object to instantiate for the specified file.

Syntax 

HRESULT GetClassFileOrMime(
  LPBC 
pBC,
  LPCWSTR 
szFilename,
  LPVOID 
pBuffer,
  DWORD 
cbSize,
  LPCWSTR 
szMime,
  DWORD 
dwReserved,
  CLSID* 
pclsid
);

Parameters

pBC

Optional. Address of a bind context that can affect the mapping to a CLSID. This parameter should usually be NULL, although it can be used to override system CLSID mappings when used in conjunction with RegisterMediaTypeClass.

szFilename

Optional. Address of a string variable that contains the file name.

pBuffer

Optional. Address of a buffer that contains data from the beginning of the file.

cbSize

Unsigned long integer value that contains the size of pBuffer.

szMime

Optional. Address of a string variable that contains the MIME type of the file.

dwReserved

Reserved. Must be set to zero.

pclsid

Address of a CLSID that receives the CLSID of the object to instantiate for the specified file.

Return Value

Returns S_OK if successful or an error value otherwise.

Requirements

Header urlmon.h, urlmon.idl
Library urlmon.lib
Windows Embedded CE Windows CE .NET 4.0 and later
Windows Mobile Windows Mobile Version 5.0 and later