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 |
); |
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
Windows NT only: HKEY_PERFORMANCE_DATA
Windows 95 only: HKEY_DYN_DATA
The enumerated values are associated with the key identified by hKey.
Because values are not ordered, any new value will have an arbitrary index.
This means that the function may return values in any order.
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. This is equivalent to REG_DWORD. In little-endian format, a multi-byte value is stored in memory from the lowest byte (the “little end”) to the highest byte. For example, the value 0x12345678 is stored as (0x78 0x56 0x34 0x12) in little-endian format. Windows NT and Windows 95 are designed to run on little-endian computer architectures. A user may connect to computers that have big-endian architectures, such as some UNIX systems. |
REG_DWORD_BIG_ENDIAN |
A 32-bit number in big-endian format. In big-endian format, a multi-byte value is stored in memory from the highest byte (the “big end”) to the lowest byte. For example, the value 0x12345678 is stored as (0x12 0x34 0x56 0x78) in big-endian format. |
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.
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.
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.
RegCreateKeyEx, RegEnumKey, RegEnumKeyEx, RegOpenKeyEx, RegQueryInfoKey
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