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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| advapi32.lib
| Header File
| winreg.h
| Unicode
| WinNT
| Platform Notes
| None
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RegEnumValue
The RegEnumValue function enumerates the values for the specified open registry key. The
function copies one indexed value name and data block for the key each time it is
called.
LONG RegEnumValue(
HKEY hKey,
| // handle of key to query
| DWORD dwIndex,
| // index of value to query
| LPTSTR lpValueName,
| // address of buffer for value string
| LPDWORD lpcbValueName,
| // address for size of value buffer
| LPDWORD lpReserved,
| // reserved
| LPDWORD lpType,
| // address of buffer for type code
| LPBYTE lpData,
| // address of buffer for value data
| LPDWORD lpcbData
| // address for size of data buffer
| );
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Parameters
hKey
Identifies a currently open key or any of the following predefined reserved
handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
The enumerated values are associated with the key identified by hKey.
dwIndex
Specifies the index of the value to retrieve. This parameter should be zero
for the first call to the RegEnumValue function and then be incremented for subsequent calls.
Because values are not ordered, any new value will have an arbitrary index.
This means that the function may return values in any order.
lpValueName
Points to a buffer that receives the name of the value, including the
terminating null character.
lpcbValueName
Points to a variable that specifies the size, in characters, of the buffer
pointed to by the lpValueName parameter. This size should include the terminating null character. When the
function returns, the variable pointed to by lpcbValueName contains the number of characters stored in the buffer. The count returned
does not include the terminating null character.
lpReserved
Reserved; must be NULL.
lpType
Points to a variable that receives the type code for the value entry. The type
code can be one of the following values:
Value
| Meaning
| REG_BINARY
| Binary data in any form.
| REG_DWORD
| A 32-bit number.
| REG_DWORD_LITTLE_ENDIAN
| A 32-bit number in little-endian format (same as REG_DWORD). In little-endian
format, the most significant byte of a word is the high-order byte. This is the
most common format for computers running Windows NT and Windows 95.
| REG_DWORD_BIG_ENDIAN
| A 32-bit number in big-endian format. In big-endian format, the most
significant byte of a word is the low-order byte.
| REG_EXPAND_SZ
| A null-terminated string that contains unexpanded references to environment
variables (for example, "%PATH%"). It will be a Unicode or ANSI string depending
on whether you use the Unicode or ANSI functions.
| REG_LINK
| A Unicode symbolic link.
| REG_MULTI_SZ
| An array of null-terminated strings, terminated by two null characters.
| REG_NONE
| No defined value type.
| REG_RESOURCE_LIST
| A device-driver resource list.
| REG_SZ
| A null-terminated string. It will be a Unicode or ANSI string, depending on
whether you use the Unicode or ANSI functions.
|
The lpType parameter can be NULL if the type code is not required.
lpData
Points to a buffer that receives the data for the value entry. This parameter
can be NULL if the data is not required.
lpcbData
Points to a variable that specifies the size, in bytes, of the buffer pointed
to by the lpData parameter. When the function returns, the variable pointed to by the lpcbData parameter contains the number of bytes stored in the buffer. This parameter
can be NULL, only if lpData is NULL.
Return Values
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value is a nonzero error code defined in
WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic
description of the error.
Remarks
To enumerate values, an application should initially call the RegEnumValue function with the dwIndex parameter set to zero. The application should then increment dwIndex and call the RegEnumValue function until there are no more values (until the function returns
ERROR_NO_MORE_ITEMS).
The application can also set dwIndex to the index of the last value on the first call to the function and
decrement the index until the value with index 0 is enumerated. To retrieve the index
of the last value, use the RegQueryInfoKey function.
While using RegEnumValue, an application should not call any registration functions that might change
the key being queried.
The key identified by the hKey parameter must have been opened with KEY_QUERY_VALUE access. To open the key,
use the RegCreateKeyEx or RegOpenKeyEx function.
To determine the maximum size of the name and data buffers, use the RegQueryInfoKey function.
See Also
RegCreateKeyEx, RegEnumKey, RegEnumKeyEx, RegOpenKeyEx, RegQueryInfoKey
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