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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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RegSetValue
The RegSetValue function associates a value with a specified key. This value must be a text
string and cannot have a name. This function is provided for compatibility with
Windows version 3.1. Win32-based applications should use the RegSetValueEx function, which allows an application to set any number of named values of
any data type.
LONG RegSetValue(
HKEY hKey,
| // handle of key to set value for
| LPCTSTR lpSubKey,
| // address of subkey name
| DWORD dwType,
| // type of value
| LPCTSTR 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
lpSubKey
Points to a null-terminated string containing the name of the subkey with
which a value is associated. This parameter can be null or a pointer to an empty
string. In this case, the value will be added to the key identified by the hKey parameter.
dwType
Specifies the type of information to be stored. This parameter must be the
REG_SZ type. To store other data types, use the RegSetValueEx function.
lpData
Points to a null-terminated string containing the value to set for the
specified key.
cbData
Specifies the length, in bytes, of the string pointed to by the lpData parameter, not including 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
If the key specified by the lpSubKey parameter does not exist, the RegSetValue function creates it.
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.
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 the ANSI version of this function is used (either by explicitly
calling RegSetValue or by not defining Unicode before including the WINDOWS.H file), 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, RegSetValueEx
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