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CM_Open_Class_Key function

The CM_Open_Class_Key function opens the device setup class registry key, the device interface class registry key, or a specific subkey of a class.

Syntax

C++


CMAPI
CONFIGRET
WINAPI CM_Open_Class_Key(
  _In_opt_ LPGUID         ClassGuid,
  _In_opt_ LPCWSTR        pszClassName,
  _In_     REGSAM         samDesired,
  _In_     REGDISPOSITION Disposition,
  _Out_    PHKEY          phkClass,
  _In_     ULONG          ulFlags
);

Parameters

ClassGuid [in, optional]

Pointer to the GUID of the class whose registry key is to be opened. This parameter is optional and can be NULL. If this parameter is NULL, the root of the class tree is opened.

pszClassName [in, optional]

Reserved. Must be set to NULL.

samDesired [in]

The registry security access for the key to be opened.

Disposition [in]

Specifies how the registry key is to be opened. May be one of the following values:

RegDisposition_OpenAlways: Open the key if it exists. Otherwise, create the key.
RegDisposition_OpenExisting: Open the key only if it exists.

phkClass [out]

Pointer to an HKEY that will receive the opened key upon success.

ulFlags [in]

Open class key flags:

CM_OPEN_CLASS_KEY_INSTALLER: The key to be opened is for a device setup class.
CM_OPEN_CLASS_KEY_INTERFACE: The key to be opened is for a device interface class.

Return value

If the operation succeeds, the function returns CR_SUCCESS. Otherwise, it returns one of the CR_-prefixed error codes defined in Cfgmgr32.h.

Remarks

Close the handle returned from this function by calling RegCloseKey.

Requirements

Target platform	Desktop
Version	Available in Microsoft Windows 2000 and later versions of Windows.
Header	Cfgmgr32.h (include Cfgmgr32.h)
Library	Cfgmgr32.lib
Unicode and ANSI names	CM_Open_Class_KeyW (Unicode)