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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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RegSetValueEx
The RegSetValueEx function stores data in the value field of an open registry key. It can also
set additional value and type information for the specified key.
LONG RegSetValueEx(
HKEY hKey,
| // handle of key to set value for
| LPCTSTR lpValueName,
| // address of value to set
| DWORD Reserved,
| // reserved
| DWORD dwType,
| // flag for value type
| CONST BYTE *lpData,
| // address of value data
| DWORD cbData
| // size of value data
| );
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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
lpValueName
Points to a string containing the name of the value to set. If a value with
this name is not already present in the key, the function adds it to the key.
If this parameter is NULL or points to an empty string and the dwType parameter is the REG_SZ type, this function sets the same value the RegSetValue function would set.
Reserved
Reserved; must be zero.
dwType
Specifies the type of information to be stored as the value's data. This
parameter 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.
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lpData
Points to a buffer containing the data to be stored with the specified value
name.
cbData
Specifies the size, in bytes, of the information pointed to by the lpData parameter. If the data is of type REG_SZ, REG_EXPAND_SZ, or REG_MULTI_SZ, cbData must include the size of the terminating null character.
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
Value lengths are limited by available memory. Long values (more than 2048
bytes) should be stored as files with the filenames stored in the registry. This
helps the registry perform efficiently. Application elements such as icons,
bitmaps, and executable files should be stored as files and not be placed in the
registry.
The key identified by the hKey parameter must have been opened with KEY_SET_VALUE access. To open the key,
use the RegCreateKeyEx or RegOpenKeyEx function.
If dwType is the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type and the ANSI version of
this function is used (either by explicitly calling RegSetValueEx or by not defining Unicode before including the WINDOWS.H file), the data pointed to by
the lpData parameter must be an ANSI character string. The string is converted to
Unicode before it is stored in the registry.
See Also
RegCreateKeyEx, RegFlushKey, RegOpenKeyEx, RegQueryValue, RegQueryValueEx, RegSetValue
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