SysStringLen

// OLEAUT32.dll
#include <windows.h>

DWORD SysStringLen(
    LPWSTR pbstr   // optional
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function SysStringLen(
    <MarshalAs(UnmanagedType.LPWStr)> pbstr As String   ' LPWSTR optional
) As UInteger
End Function

' pbstr : LPWSTR optional
Declare PtrSafe Function SysStringLen Lib "oleaut32" ( _
    ByVal pbstr 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

SysStringLen = ctypes.windll.oleaut32.SysStringLen
SysStringLen.restype = wintypes.DWORD
SysStringLen.argtypes = [
    wintypes.LPCWSTR,  # pbstr : LPWSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
SysStringLen = Fiddle::Function.new(
  lib['SysStringLen'],
  [
    Fiddle::TYPE_VOIDP,  # pbstr : LPWSTR optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn SysStringLen(
        pbstr: *mut u16  // LPWSTR optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern uint SysStringLen([MarshalAs(UnmanagedType.LPWStr)] string pbstr);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_SysStringLen' -Namespace Win32 -PassThru
# $api::SysStringLen(pbstr)

#uselib "OLEAUT32.dll"
#func global SysStringLen "SysStringLen" sptr
; SysStringLen pbstr   ; 戻り値は stat
; pbstr : LPWSTR optional -> "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 "OLEAUT32.dll"
#cfunc global SysStringLen "SysStringLen" wstr
; res = SysStringLen(pbstr)
; pbstr : LPWSTR optional -> "wstr"

; DWORD SysStringLen(LPWSTR pbstr)
#uselib "OLEAUT32.dll"
#cfunc global SysStringLen "SysStringLen" wstr
; res = SysStringLen(pbstr)
; pbstr : LPWSTR optional -> "wstr"

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

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procSysStringLen = oleaut32.NewProc("SysStringLen")
)

// pbstr (LPWSTR optional)
r1, _, err := procSysStringLen.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pbstr))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function SysStringLen(
  pbstr: PWideChar   // LPWSTR optional
): DWORD; stdcall;
  external 'OLEAUT32.dll' name 'SysStringLen';

result := DllCall("OLEAUT32\SysStringLen"
    , "WStr", pbstr   ; LPWSTR optional
    , "UInt")   ; return: DWORD

●SysStringLen(pbstr) = DLL("OLEAUT32.dll", "dword SysStringLen(char*)")
# 呼び出し: SysStringLen(pbstr)
# pbstr : LPWSTR optional -> "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)。