CreateSymbolicLinkW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOLEAN CreateSymbolicLinkW(
    LPCWSTR lpSymlinkFileName,
    LPCWSTR lpTargetFileName,
    SYMBOLIC_LINK_FLAGS dwFlags
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateSymbolicLinkW(
    <MarshalAs(UnmanagedType.LPWStr)> lpSymlinkFileName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpTargetFileName As String,   ' LPCWSTR
    dwFlags As UInteger   ' SYMBOLIC_LINK_FLAGS
) As Byte
End Function

' lpSymlinkFileName : LPCWSTR
' lpTargetFileName : LPCWSTR
' dwFlags : SYMBOLIC_LINK_FLAGS
Declare PtrSafe Function CreateSymbolicLinkW Lib "kernel32" ( _
    ByVal lpSymlinkFileName As LongPtr, _
    ByVal lpTargetFileName As LongPtr, _
    ByVal dwFlags As Long) As Byte
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateSymbolicLinkW = ctypes.windll.kernel32.CreateSymbolicLinkW
CreateSymbolicLinkW.restype = ctypes.c_byte
CreateSymbolicLinkW.argtypes = [
    wintypes.LPCWSTR,  # lpSymlinkFileName : LPCWSTR
    wintypes.LPCWSTR,  # lpTargetFileName : LPCWSTR
    wintypes.DWORD,  # dwFlags : SYMBOLIC_LINK_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
CreateSymbolicLinkW = Fiddle::Function.new(
  lib['CreateSymbolicLinkW'],
  [
    Fiddle::TYPE_VOIDP,  # lpSymlinkFileName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpTargetFileName : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : SYMBOLIC_LINK_FLAGS
  ],
  Fiddle::TYPE_CHAR)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn CreateSymbolicLinkW(
        lpSymlinkFileName: *const u16,  // LPCWSTR
        lpTargetFileName: *const u16,  // LPCWSTR
        dwFlags: u32  // SYMBOLIC_LINK_FLAGS
    ) -> u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern byte CreateSymbolicLinkW([MarshalAs(UnmanagedType.LPWStr)] string lpSymlinkFileName, [MarshalAs(UnmanagedType.LPWStr)] string lpTargetFileName, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_CreateSymbolicLinkW' -Namespace Win32 -PassThru
# $api::CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, dwFlags)

#uselib "KERNEL32.dll"
#func global CreateSymbolicLinkW "CreateSymbolicLinkW" wptr, wptr, wptr
; CreateSymbolicLinkW lpSymlinkFileName, lpTargetFileName, dwFlags   ; 戻り値は stat
; lpSymlinkFileName : LPCWSTR -> "wptr"
; lpTargetFileName : LPCWSTR -> "wptr"
; dwFlags : SYMBOLIC_LINK_FLAGS -> "wptr"
; ※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 CreateSymbolicLinkW "CreateSymbolicLinkW" wstr, wstr, int
; res = CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, dwFlags)
; lpSymlinkFileName : LPCWSTR -> "wstr"
; lpTargetFileName : LPCWSTR -> "wstr"
; dwFlags : SYMBOLIC_LINK_FLAGS -> "int"

; BOOLEAN CreateSymbolicLinkW(LPCWSTR lpSymlinkFileName, LPCWSTR lpTargetFileName, SYMBOLIC_LINK_FLAGS dwFlags)
#uselib "KERNEL32.dll"
#cfunc global CreateSymbolicLinkW "CreateSymbolicLinkW" wstr, wstr, int
; res = CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, dwFlags)
; lpSymlinkFileName : LPCWSTR -> "wstr"
; lpTargetFileName : LPCWSTR -> "wstr"
; dwFlags : SYMBOLIC_LINK_FLAGS -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procCreateSymbolicLinkW = kernel32.NewProc("CreateSymbolicLinkW")
)

// lpSymlinkFileName (LPCWSTR), lpTargetFileName (LPCWSTR), dwFlags (SYMBOLIC_LINK_FLAGS)
r1, _, err := procCreateSymbolicLinkW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpSymlinkFileName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpTargetFileName))),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOLEAN

function CreateSymbolicLinkW(
  lpSymlinkFileName: PWideChar;   // LPCWSTR
  lpTargetFileName: PWideChar;   // LPCWSTR
  dwFlags: DWORD   // SYMBOLIC_LINK_FLAGS
): ByteBool; stdcall;
  external 'KERNEL32.dll' name 'CreateSymbolicLinkW';

result := DllCall("KERNEL32\CreateSymbolicLinkW"
    , "WStr", lpSymlinkFileName   ; LPCWSTR
    , "WStr", lpTargetFileName   ; LPCWSTR
    , "UInt", dwFlags   ; SYMBOLIC_LINK_FLAGS
    , "Char")   ; return: BOOLEAN

●CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, dwFlags) = DLL("KERNEL32.dll", "byte CreateSymbolicLinkW(char*, char*, dword)")
# 呼び出し: CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, dwFlags)
# lpSymlinkFileName : LPCWSTR -> "char*"
# lpTargetFileName : LPCWSTR -> "char*"
# dwFlags : SYMBOLIC_LINK_FLAGS -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。