# Function Reference

RegWrite

Creates a key or value in the registry.

RegWrite ( "keyname" [,"valuename", "type", value] )

Parameters

keyname | The registry key to write to. If no other parameters are specified this key will simply be created.
valuename | [optional] The valuename to write to.
type | [optional] Type of key to write: "REG_SZ", "REG_MULTI_SZ", "REG_EXPAND_SZ", "REG_DWORD", or "REG_BINARY".
value | [optional] The value to write.

Return Value

Success: | Returns 1.
Failure: | Returns 0 if error writing registry key or value.
| @error can be set to following values :
| 1 if unable to open requested key
| 2 if unable to open requested main key
| 3 if unable to remote connect to the registry
| -1 if unable to open requested value
| -2 if value type not supported

Remarks

A registry key must start with "HKEY_LOCAL_MACHINE" ("HKLM") or "HKEY_USERS" ("HKU") or "HKEY_CURRENT_USER" ("HKCU") or "HKEY_CLASSES_ROOT" ("HKCR") or "HKEY_CURRENT_CONFIG" ("HKCC").
When running on 64-bit Windows if you want to write a key or value specific to the 64-bit environment you have to suffix the HK... with 64 i.e. HKLM64.
AutoIt supports registry keys of type REG_BINARY, REG_SZ, REG_MULTI_SZ, REG_EXPAND_SZ, and REG_DWORD.
To access the (Default) value use "" (a blank string) for the valuename.
When writing a REG_BINARY key use a string of hex characters, e.g. the REG_BINARY value of 01,a9,ff,77 can be written by using the string "01A9FF77".
When writing a REG_MULTI_SZ key you must separate each value with @LF. The value must NOT end with @LF unless you want ant empty substring (see example).
It is possible to access remote registries by using a keyname in the form "\\computername\keyname". To use this feature you must have the correct access rights on NT/2000/XP/2003, or if you are using a 9x based OS the remote PC must have the remote registry service installed first (See Microsoft Knowledge Base Article - 141460).

Related

RegDelete, RegRead

Example

; Write a single REG_SZ value
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey", "REG_SZ", "Hello this is a test")
; Write the REG_MULTI_SZ value of "line1" and "line2"
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey1", "REG_MULTI_SZ", "line1" & @LF & "line2")
; Write the REG_MULTI_SZ value of "line1"
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey2", "REG_MULTI_SZ", "line1")
; always add and extra null string
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey3", "REG_MULTI_SZ", "line1" & @LF & "line2" & @LF)
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey4", "REG_MULTI_SZ", "line1" & @LF & @LF & "line2" & @LF)
; empty REG_MULTI_SZ
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test", "TestKey5", "REG_MULTI_SZ", "")
; create just the key
RegWrite("HKEY_LOCAL_MACHINE\SOFTWARE\Test1")