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2019.02.16 How to make a volatile registry using NSIS script

2019. 2. 16. 09:54

How to make a volatile registry using NSIS script

2019. 2. 16. 09:54 in text/language

There is no native way to make a volatile registry key in NSIS, so we have to call WINAPI directly.

!define REG_OPTION_VOLATILE 1

Function MakeVolatileKey

    System::Call 'advapi32::RegCreateKeyEx(i ${HKEY_LOCAL_MACHINE}, t "Software\volatile", i0, i0, i ${REG_OPTION_VOLATILE}, i ${GENERIC_WRITE}, i0, *i.r1, *i)i.r0'
    ${If} $0 = 0
            System::Call 'advapi32::RegCloseKey(ir1)'
            WriteRegDWORD HKLM "Software\volatile" test 1
    ${EndIf}

FunctionEnd

But, there is one thing we have to consider on 64bit Windows.
If we add a code 'SetRegView 64' in order to avoid registry redirection, two registry keys are made:
1. HKEY_LOCAL_MACHINE\SOFTWARE\Volatile (by WriteRegDWORD)
2, HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\volatile (by RegCreateKeyEx)

SetRegView can not affect native registry APIs; then we should apply a KEY_WOW64_64KEY option to RegCreateKeyEx API.

!include WinCore.nsh
!include LogicLib.nsh
!include x64.nsh

!define REG_OPTION_VOLATILE 1
!define KEY_WOW64_64KEY 0x0100

Function MakeVolatileKey

    ${If} ${RunningX64}
        IntOp $R0 ${GENERIC_WRITE} + ${KEY_WOW64_64KEY}
        SetRegView 64
    ${Else}
        Strcpy $R0 ${GENERIC_WRITE}
        SetRegView 32
    ${EndIf}

    System::Call 'advapi32::RegCreateKeyEx(i ${HKEY_LOCAL_MACHINE}, t "Software\volatile", i0, i0, i ${REG_OPTION_VOLATILE}, i $R0, i0, *i.r1, *i)i.r0'
    ${If} $0 = 0
            System::Call 'advapi32::RegCloseKey(ir1)'
            WriteRegDWORD HKLM "Software\Volatile" test 1
    ${EndIf}

FunctionEnd