RtlInitStringEx

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

NTSTATUS RtlInitStringEx(
    STRING* DestinationString,
    CHAR* SourceString
);

<DllImport("ntdll.dll", ExactSpelling:=True)>
Public Shared Function RtlInitStringEx(
    DestinationString As IntPtr,   ' STRING* in/out
    SourceString As IntPtr   ' CHAR* in/out
) As Integer
End Function

' DestinationString : STRING* in/out
' SourceString : CHAR* in/out
Declare PtrSafe Function RtlInitStringEx Lib "ntdll" ( _
    ByVal DestinationString As LongPtr, _
    ByVal SourceString 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

RtlInitStringEx = ctypes.windll.ntdll.RtlInitStringEx
RtlInitStringEx.restype = ctypes.c_int
RtlInitStringEx.argtypes = [
    ctypes.c_void_p,  # DestinationString : STRING* in/out
    ctypes.POINTER(ctypes.c_byte),  # SourceString : CHAR* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlInitStringEx = Fiddle::Function.new(
  lib['RtlInitStringEx'],
  [
    Fiddle::TYPE_VOIDP,  # DestinationString : STRING* in/out
    Fiddle::TYPE_VOIDP,  # SourceString : CHAR* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ntdll")]
extern "system" {
    fn RtlInitStringEx(
        DestinationString: *mut STRING,  // STRING* in/out
        SourceString: *mut i8  // CHAR* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll")]
public static extern int RtlInitStringEx(IntPtr DestinationString, IntPtr SourceString);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlInitStringEx' -Namespace Win32 -PassThru
# $api::RtlInitStringEx(DestinationString, SourceString)

#uselib "ntdll.dll"
#func global RtlInitStringEx "RtlInitStringEx" sptr, sptr
; RtlInitStringEx varptr(DestinationString), varptr(SourceString)   ; 戻り値は stat
; DestinationString : STRING* in/out -> "sptr"
; SourceString : CHAR* in/out -> "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 "ntdll.dll"
#cfunc global RtlInitStringEx "RtlInitStringEx" var, var
; res = RtlInitStringEx(DestinationString, SourceString)
; DestinationString : STRING* in/out -> "var"
; SourceString : CHAR* in/out -> "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。

; NTSTATUS RtlInitStringEx(STRING* DestinationString, CHAR* SourceString)
#uselib "ntdll.dll"
#cfunc global RtlInitStringEx "RtlInitStringEx" var, var
; res = RtlInitStringEx(DestinationString, SourceString)
; DestinationString : STRING* in/out -> "var"
; SourceString : CHAR* in/out -> "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 (
	ntdll = windows.NewLazySystemDLL("ntdll.dll")
	procRtlInitStringEx = ntdll.NewProc("RtlInitStringEx")
)

// DestinationString (STRING* in/out), SourceString (CHAR* in/out)
r1, _, err := procRtlInitStringEx.Call(
	uintptr(DestinationString),
	uintptr(SourceString),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function RtlInitStringEx(
  DestinationString: Pointer;   // STRING* in/out
  SourceString: Pointer   // CHAR* in/out
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlInitStringEx';

result := DllCall("ntdll\RtlInitStringEx"
    , "Ptr", DestinationString   ; STRING* in/out
    , "Ptr", SourceString   ; CHAR* in/out
    , "Int")   ; return: NTSTATUS

●RtlInitStringEx(DestinationString, SourceString) = DLL("ntdll.dll", "int RtlInitStringEx(void*, void*)")
# 呼び出し: RtlInitStringEx(DestinationString, SourceString)
# DestinationString : STRING* in/out -> "void*"
# SourceString : CHAR* in/out -> "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)。