CharNextW

// USER32.dll  (Unicode / -W)
#include <windows.h>

LPWSTR CharNextW(
    LPCWSTR lpsz
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CharNextW(
    <MarshalAs(UnmanagedType.LPWStr)> lpsz As String   ' LPCWSTR
) As IntPtr
End Function

' lpsz : LPCWSTR
Declare PtrSafe Function CharNextW Lib "user32" ( _
    ByVal lpsz As LongPtr) As LongPtr
' 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

CharNextW = ctypes.windll.user32.CharNextW
CharNextW.restype = wintypes.LPWSTR
CharNextW.argtypes = [
    wintypes.LPCWSTR,  # lpsz : LPCWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CharNextW = Fiddle::Function.new(
  lib['CharNextW'],
  [
    Fiddle::TYPE_VOIDP,  # lpsz : LPCWSTR
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn CharNextW(
        lpsz: *const u16  // LPCWSTR
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr CharNextW([MarshalAs(UnmanagedType.LPWStr)] string lpsz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CharNextW' -Namespace Win32 -PassThru
# $api::CharNextW(lpsz)

#uselib "USER32.dll"
#func global CharNextW "CharNextW" wptr
; CharNextW lpsz   ; 戻り値は stat
; lpsz : LPCWSTR -> "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 "USER32.dll"
#cfunc global CharNextW "CharNextW" wstr
; res = CharNextW(lpsz)
; lpsz : LPCWSTR -> "wstr"

; LPWSTR CharNextW(LPCWSTR lpsz)
#uselib "USER32.dll"
#cfunc global CharNextW "CharNextW" wstr
; res = CharNextW(lpsz)
; lpsz : LPCWSTR -> "wstr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCharNextW = user32.NewProc("CharNextW")
)

// lpsz (LPCWSTR)
r1, _, err := procCharNextW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpsz))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPWSTR

function CharNextW(
  lpsz: PWideChar   // LPCWSTR
): PWideChar; stdcall;
  external 'USER32.dll' name 'CharNextW';

result := DllCall("USER32\CharNextW"
    , "WStr", lpsz   ; LPCWSTR
    , "Ptr")   ; return: LPWSTR

●CharNextW(lpsz) = DLL("USER32.dll", "char* CharNextW(char*)")
# 呼び出し: CharNextW(lpsz)
# lpsz : LPCWSTR -> "char*"
# 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。