SetDefaultCommConfigW

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

BOOL SetDefaultCommConfigW(
    LPCWSTR lpszName,
    COMMCONFIG* lpCC,
    DWORD dwSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetDefaultCommConfigW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszName As String,   ' LPCWSTR
    lpCC As IntPtr,   ' COMMCONFIG*
    dwSize As UInteger   ' DWORD
) As Boolean
End Function

' lpszName : LPCWSTR
' lpCC : COMMCONFIG*
' dwSize : DWORD
Declare PtrSafe Function SetDefaultCommConfigW Lib "kernel32" ( _
    ByVal lpszName As LongPtr, _
    ByVal lpCC As LongPtr, _
    ByVal dwSize As Long) As Long
' 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

SetDefaultCommConfigW = ctypes.windll.kernel32.SetDefaultCommConfigW
SetDefaultCommConfigW.restype = wintypes.BOOL
SetDefaultCommConfigW.argtypes = [
    wintypes.LPCWSTR,  # lpszName : LPCWSTR
    ctypes.c_void_p,  # lpCC : COMMCONFIG*
    wintypes.DWORD,  # dwSize : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetDefaultCommConfigW = Fiddle::Function.new(
  lib['SetDefaultCommConfigW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpCC : COMMCONFIG*
    -Fiddle::TYPE_INT,  # dwSize : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn SetDefaultCommConfigW(
        lpszName: *const u16,  // LPCWSTR
        lpCC: *mut COMMCONFIG,  // COMMCONFIG*
        dwSize: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool SetDefaultCommConfigW([MarshalAs(UnmanagedType.LPWStr)] string lpszName, IntPtr lpCC, uint dwSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetDefaultCommConfigW' -Namespace Win32 -PassThru
# $api::SetDefaultCommConfigW(lpszName, lpCC, dwSize)

#uselib "KERNEL32.dll"
#func global SetDefaultCommConfigW "SetDefaultCommConfigW" wptr, wptr, wptr
; SetDefaultCommConfigW lpszName, varptr(lpCC), dwSize   ; 戻り値は stat
; lpszName : LPCWSTR -> "wptr"
; lpCC : COMMCONFIG* -> "wptr"
; dwSize : DWORD -> "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 SetDefaultCommConfigW "SetDefaultCommConfigW" wstr, var, int
; res = SetDefaultCommConfigW(lpszName, lpCC, dwSize)
; lpszName : LPCWSTR -> "wstr"
; lpCC : COMMCONFIG* -> "var"
; dwSize : DWORD -> "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。

; BOOL SetDefaultCommConfigW(LPCWSTR lpszName, COMMCONFIG* lpCC, DWORD dwSize)
#uselib "KERNEL32.dll"
#cfunc global SetDefaultCommConfigW "SetDefaultCommConfigW" wstr, var, int
; res = SetDefaultCommConfigW(lpszName, lpCC, dwSize)
; lpszName : LPCWSTR -> "wstr"
; lpCC : COMMCONFIG* -> "var"
; dwSize : DWORD -> "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")
	procSetDefaultCommConfigW = kernel32.NewProc("SetDefaultCommConfigW")
)

// lpszName (LPCWSTR), lpCC (COMMCONFIG*), dwSize (DWORD)
r1, _, err := procSetDefaultCommConfigW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszName))),
	uintptr(lpCC),
	uintptr(dwSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetDefaultCommConfigW(
  lpszName: PWideChar;   // LPCWSTR
  lpCC: Pointer;   // COMMCONFIG*
  dwSize: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetDefaultCommConfigW';

result := DllCall("KERNEL32\SetDefaultCommConfigW"
    , "WStr", lpszName   ; LPCWSTR
    , "Ptr", lpCC   ; COMMCONFIG*
    , "UInt", dwSize   ; DWORD
    , "Int")   ; return: BOOL

●SetDefaultCommConfigW(lpszName, lpCC, dwSize) = DLL("KERNEL32.dll", "bool SetDefaultCommConfigW(char*, void*, dword)")
# 呼び出し: SetDefaultCommConfigW(lpszName, lpCC, dwSize)
# lpszName : LPCWSTR -> "char*"
# lpCC : COMMCONFIG* -> "void*"
# dwSize : DWORD -> "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。