win32api.RegSetValueEx

RegSetValueEx(key, valueName, reserved, type, value)

Stores data in the value field of an open registry key.

Parameters

key : PyHKEY/int

An already open key, or any one of the following win32con constants:
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS

valueName : string

The name of the value to set. If a value with this name is not already present in the key, the method adds it to the key.
If this parameter is None or an empty string and the type parameter is the win32api.REG_SZ type, this function sets the same value the win32api::RegSetValue method would set.

reserved : any

Place holder for reserved argument. Zero will always be passed to the API function.

type : int

Type of data.

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.

REG_QWORD A 64-bit number.

REG_QWORD_LITTLE_ENDIAN A 64-bit number in little-endian format. This is equivalent to REG_QWORD.
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

value : registry data

The value to be stored with the specified value name.

Comments

This method can also set additional value and type information for the specified key.
The key identified by the key parameter must have been opened with KEY_SET_VALUE access. To open the key, use the win32api::RegCreateKeyEx or win32api::RegOpenKeyEx methods.
Value lengths are limited by available memory. Long values (more than 2048 bytes) should be stored as files with the filenames stored in the configuration registry. This helps the registry perform efficiently.
The key identified by the key parameter must have been opened with KEY_SET_VALUE access.

Win32 API References

Search for RegSetValueEx at msdn, google or google groups.

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.
REG_QWORD	A 64-bit number.
REG_QWORD_LITTLE_ENDIAN	A 64-bit number in little-endian format. This is equivalent to REG_QWORD. 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