NormalizeString

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

INT NormalizeString(
    NORM_FORM NormForm,
    LPCWSTR lpSrcString,
    INT cwSrcLength,
    LPWSTR lpDstString,   // optional
    INT cwDstLength
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function NormalizeString(
    NormForm As Integer,   ' NORM_FORM
    <MarshalAs(UnmanagedType.LPWStr)> lpSrcString As String,   ' LPCWSTR
    cwSrcLength As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPWStr)> lpDstString As System.Text.StringBuilder,   ' LPWSTR optional, out
    cwDstLength As Integer   ' INT
) As Integer
End Function

' NormForm : NORM_FORM
' lpSrcString : LPCWSTR
' cwSrcLength : INT
' lpDstString : LPWSTR optional, out
' cwDstLength : INT
Declare PtrSafe Function NormalizeString Lib "kernel32" ( _
    ByVal NormForm As Long, _
    ByVal lpSrcString As LongPtr, _
    ByVal cwSrcLength As Long, _
    ByVal lpDstString As LongPtr, _
    ByVal cwDstLength As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

NormalizeString = ctypes.windll.kernel32.NormalizeString
NormalizeString.restype = ctypes.c_int
NormalizeString.argtypes = [
    ctypes.c_int,  # NormForm : NORM_FORM
    wintypes.LPCWSTR,  # lpSrcString : LPCWSTR
    ctypes.c_int,  # cwSrcLength : INT
    wintypes.LPWSTR,  # lpDstString : LPWSTR optional, out
    ctypes.c_int,  # cwDstLength : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
NormalizeString = Fiddle::Function.new(
  lib['NormalizeString'],
  [
    Fiddle::TYPE_INT,  # NormForm : NORM_FORM
    Fiddle::TYPE_VOIDP,  # lpSrcString : LPCWSTR
    Fiddle::TYPE_INT,  # cwSrcLength : INT
    Fiddle::TYPE_VOIDP,  # lpDstString : LPWSTR optional, out
    Fiddle::TYPE_INT,  # cwDstLength : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn NormalizeString(
        NormForm: i32,  // NORM_FORM
        lpSrcString: *const u16,  // LPCWSTR
        cwSrcLength: i32,  // INT
        lpDstString: *mut u16,  // LPWSTR optional, out
        cwDstLength: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern int NormalizeString(int NormForm, [MarshalAs(UnmanagedType.LPWStr)] string lpSrcString, int cwSrcLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpDstString, int cwDstLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_NormalizeString' -Namespace Win32 -PassThru
# $api::NormalizeString(NormForm, lpSrcString, cwSrcLength, lpDstString, cwDstLength)

#uselib "KERNEL32.dll"
#func global NormalizeString "NormalizeString" sptr, sptr, sptr, sptr, sptr
; NormalizeString NormForm, lpSrcString, cwSrcLength, varptr(lpDstString), cwDstLength   ; 戻り値は stat
; NormForm : NORM_FORM -> "sptr"
; lpSrcString : LPCWSTR -> "sptr"
; cwSrcLength : INT -> "sptr"
; lpDstString : LPWSTR optional, out -> "sptr"
; cwDstLength : INT -> "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 NormalizeString "NormalizeString" int, wstr, int, var, int
; res = NormalizeString(NormForm, lpSrcString, cwSrcLength, lpDstString, cwDstLength)
; NormForm : NORM_FORM -> "int"
; lpSrcString : LPCWSTR -> "wstr"
; cwSrcLength : INT -> "int"
; lpDstString : LPWSTR optional, out -> "var"
; cwDstLength : INT -> "int"
; ※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。

; INT NormalizeString(NORM_FORM NormForm, LPCWSTR lpSrcString, INT cwSrcLength, LPWSTR lpDstString, INT cwDstLength)
#uselib "KERNEL32.dll"
#cfunc global NormalizeString "NormalizeString" int, wstr, int, var, int
; res = NormalizeString(NormForm, lpSrcString, cwSrcLength, lpDstString, cwDstLength)
; NormForm : NORM_FORM -> "int"
; lpSrcString : LPCWSTR -> "wstr"
; cwSrcLength : INT -> "int"
; lpDstString : LPWSTR optional, out -> "var"
; cwDstLength : INT -> "int"
; ※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")
	procNormalizeString = kernel32.NewProc("NormalizeString")
)

// NormForm (NORM_FORM), lpSrcString (LPCWSTR), cwSrcLength (INT), lpDstString (LPWSTR optional, out), cwDstLength (INT)
r1, _, err := procNormalizeString.Call(
	uintptr(NormForm),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpSrcString))),
	uintptr(cwSrcLength),
	uintptr(lpDstString),
	uintptr(cwDstLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function NormalizeString(
  NormForm: Integer;   // NORM_FORM
  lpSrcString: PWideChar;   // LPCWSTR
  cwSrcLength: Integer;   // INT
  lpDstString: PWideChar;   // LPWSTR optional, out
  cwDstLength: Integer   // INT
): Integer; stdcall;
  external 'KERNEL32.dll' name 'NormalizeString';

result := DllCall("KERNEL32\NormalizeString"
    , "Int", NormForm   ; NORM_FORM
    , "WStr", lpSrcString   ; LPCWSTR
    , "Int", cwSrcLength   ; INT
    , "Ptr", lpDstString   ; LPWSTR optional, out
    , "Int", cwDstLength   ; INT
    , "Int")   ; return: INT

●NormalizeString(NormForm, lpSrcString, cwSrcLength, lpDstString, cwDstLength) = DLL("KERNEL32.dll", "int NormalizeString(int, char*, int, char*, int)")
# 呼び出し: NormalizeString(NormForm, lpSrcString, cwSrcLength, lpDstString, cwDstLength)
# NormForm : NORM_FORM -> "int"
# lpSrcString : LPCWSTR -> "char*"
# cwSrcLength : INT -> "int"
# lpDstString : LPWSTR optional, out -> "char*"
# cwDstLength : INT -> "int"
# 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)。