SetTimeZoneInformation

// KERNEL32.dll
#include <windows.h>

BOOL SetTimeZoneInformation(
    const TIME_ZONE_INFORMATION* lpTimeZoneInformation
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetTimeZoneInformation(
    lpTimeZoneInformation As IntPtr   ' TIME_ZONE_INFORMATION*
) As Boolean
End Function

' lpTimeZoneInformation : TIME_ZONE_INFORMATION*
Declare PtrSafe Function SetTimeZoneInformation Lib "kernel32" ( _
    ByVal lpTimeZoneInformation As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetTimeZoneInformation = ctypes.windll.kernel32.SetTimeZoneInformation
SetTimeZoneInformation.restype = wintypes.BOOL
SetTimeZoneInformation.argtypes = [
    ctypes.c_void_p,  # lpTimeZoneInformation : TIME_ZONE_INFORMATION*
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetTimeZoneInformation = Fiddle::Function.new(
  lib['SetTimeZoneInformation'],
  [
    Fiddle::TYPE_VOIDP,  # lpTimeZoneInformation : TIME_ZONE_INFORMATION*
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn SetTimeZoneInformation(
        lpTimeZoneInformation: *const TIME_ZONE_INFORMATION  // TIME_ZONE_INFORMATION*
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool SetTimeZoneInformation(IntPtr lpTimeZoneInformation);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetTimeZoneInformation' -Namespace Win32 -PassThru
# $api::SetTimeZoneInformation(lpTimeZoneInformation)

#uselib "KERNEL32.dll"
#func global SetTimeZoneInformation "SetTimeZoneInformation" sptr
; SetTimeZoneInformation varptr(lpTimeZoneInformation)   ; 戻り値は stat
; lpTimeZoneInformation : TIME_ZONE_INFORMATION* -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "KERNEL32.dll"
#cfunc global SetTimeZoneInformation "SetTimeZoneInformation" var
; res = SetTimeZoneInformation(lpTimeZoneInformation)
; lpTimeZoneInformation : TIME_ZONE_INFORMATION* -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOL SetTimeZoneInformation(TIME_ZONE_INFORMATION* lpTimeZoneInformation)
#uselib "KERNEL32.dll"
#cfunc global SetTimeZoneInformation "SetTimeZoneInformation" var
; res = SetTimeZoneInformation(lpTimeZoneInformation)
; lpTimeZoneInformation : TIME_ZONE_INFORMATION* -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetTimeZoneInformation = kernel32.NewProc("SetTimeZoneInformation")
)

// lpTimeZoneInformation (TIME_ZONE_INFORMATION*)
r1, _, err := procSetTimeZoneInformation.Call(
	uintptr(lpTimeZoneInformation),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetTimeZoneInformation(
  lpTimeZoneInformation: Pointer   // TIME_ZONE_INFORMATION*
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetTimeZoneInformation';

result := DllCall("KERNEL32\SetTimeZoneInformation"
    , "Ptr", lpTimeZoneInformation   ; TIME_ZONE_INFORMATION*
    , "Int")   ; return: BOOL

●SetTimeZoneInformation(lpTimeZoneInformation) = DLL("KERNEL32.dll", "bool SetTimeZoneInformation(void*)")
# 呼び出し: SetTimeZoneInformation(lpTimeZoneInformation)
# lpTimeZoneInformation : TIME_ZONE_INFORMATION* -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。