SHEnumKeyExW function (shlwapi.h)

Article
02/22/2024

Enumerates the subkeys of the specified open registry key.

Syntax

LSTATUS SHEnumKeyExW(
  [in] HKEY    hkey,
       DWORD   dwIndex,
       LPWSTR  pszName,
  [in] LPDWORD pcchName
);

Parameters

[in] hkey

Type: HKEY

A handle to the currently open key, or any of the following predefined values.

HKEY_CLASSES_ROOT

HKEY_CURRENT_CONFIG

HKEY_CURRENT_USER

HKEY_LOCAL_MACHINE

HKEY_PERFORMANCE_DATA

HKEY_USERS

dwIndex

Type: DWORD

The index of the subkey to retrieve. This parameter should be zero for the first call and incremented for subsequent calls.

pszName

Type: LPTSTR

The address of a character buffer that receives the enumerated key name.

[in] pcchName

Type: LPDWORD

The address of a DWORD that, on entry, contains the size of the buffer at pszName, in characters. On exit, this contains the number of characters that were copied to pszName.

Return value

Type: LSTATUS

Returns ERROR_SUCCESS if successful, or a nonzero error code defined in Winerror.h otherwise. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to retrieve a textual description of the error.

Remarks

Note

The shlwapi.h header defines SHEnumKeyEx as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional, Windows XP [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	shlwapi.h
Library	Shlwapi.lib
DLL	Shlwapi.dll (version 4.71 or later)

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