mciSendStringW

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

DWORD mciSendStringW(
    LPCWSTR lpstrCommand,
    LPWSTR lpstrReturnString,   // optional
    DWORD uReturnLength,
    HWND hwndCallback   // optional
);

<DllImport("WINMM.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function mciSendStringW(
    <MarshalAs(UnmanagedType.LPWStr)> lpstrCommand As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpstrReturnString As System.Text.StringBuilder,   ' LPWSTR optional, out
    uReturnLength As UInteger,   ' DWORD
    hwndCallback As IntPtr   ' HWND optional
) As UInteger
End Function

' lpstrCommand : LPCWSTR
' lpstrReturnString : LPWSTR optional, out
' uReturnLength : DWORD
' hwndCallback : HWND optional
Declare PtrSafe Function mciSendStringW Lib "winmm" ( _
    ByVal lpstrCommand As LongPtr, _
    ByVal lpstrReturnString As LongPtr, _
    ByVal uReturnLength As Long, _
    ByVal hwndCallback As LongPtr) 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

mciSendStringW = ctypes.windll.winmm.mciSendStringW
mciSendStringW.restype = wintypes.DWORD
mciSendStringW.argtypes = [
    wintypes.LPCWSTR,  # lpstrCommand : LPCWSTR
    wintypes.LPWSTR,  # lpstrReturnString : LPWSTR optional, out
    wintypes.DWORD,  # uReturnLength : DWORD
    wintypes.HANDLE,  # hwndCallback : HWND optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINMM.dll')
mciSendStringW = Fiddle::Function.new(
  lib['mciSendStringW'],
  [
    Fiddle::TYPE_VOIDP,  # lpstrCommand : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpstrReturnString : LPWSTR optional, out
    -Fiddle::TYPE_INT,  # uReturnLength : DWORD
    Fiddle::TYPE_VOIDP,  # hwndCallback : HWND optional
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winmm")]
extern "system" {
    fn mciSendStringW(
        lpstrCommand: *const u16,  // LPCWSTR
        lpstrReturnString: *mut u16,  // LPWSTR optional, out
        uReturnLength: u32,  // DWORD
        hwndCallback: *mut core::ffi::c_void  // HWND optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINMM.dll", CharSet = CharSet.Unicode)]
public static extern uint mciSendStringW([MarshalAs(UnmanagedType.LPWStr)] string lpstrCommand, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpstrReturnString, uint uReturnLength, IntPtr hwndCallback);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINMM_mciSendStringW' -Namespace Win32 -PassThru
# $api::mciSendStringW(lpstrCommand, lpstrReturnString, uReturnLength, hwndCallback)

#uselib "WINMM.dll"
#func global mciSendStringW "mciSendStringW" wptr, wptr, wptr, wptr
; mciSendStringW lpstrCommand, varptr(lpstrReturnString), uReturnLength, hwndCallback   ; 戻り値は stat
; lpstrCommand : LPCWSTR -> "wptr"
; lpstrReturnString : LPWSTR optional, out -> "wptr"
; uReturnLength : DWORD -> "wptr"
; hwndCallback : HWND optional -> "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 "WINMM.dll"
#cfunc global mciSendStringW "mciSendStringW" wstr, var, int, sptr
; res = mciSendStringW(lpstrCommand, lpstrReturnString, uReturnLength, hwndCallback)
; lpstrCommand : LPCWSTR -> "wstr"
; lpstrReturnString : LPWSTR optional, out -> "var"
; uReturnLength : DWORD -> "int"
; hwndCallback : HWND optional -> "sptr"
; ※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。

; DWORD mciSendStringW(LPCWSTR lpstrCommand, LPWSTR lpstrReturnString, DWORD uReturnLength, HWND hwndCallback)
#uselib "WINMM.dll"
#cfunc global mciSendStringW "mciSendStringW" wstr, var, int, intptr
; res = mciSendStringW(lpstrCommand, lpstrReturnString, uReturnLength, hwndCallback)
; lpstrCommand : LPCWSTR -> "wstr"
; lpstrReturnString : LPWSTR optional, out -> "var"
; uReturnLength : DWORD -> "int"
; hwndCallback : HWND optional -> "intptr"
; ※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 (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmciSendStringW = winmm.NewProc("mciSendStringW")
)

// lpstrCommand (LPCWSTR), lpstrReturnString (LPWSTR optional, out), uReturnLength (DWORD), hwndCallback (HWND optional)
r1, _, err := procmciSendStringW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpstrCommand))),
	uintptr(lpstrReturnString),
	uintptr(uReturnLength),
	uintptr(hwndCallback),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function mciSendStringW(
  lpstrCommand: PWideChar;   // LPCWSTR
  lpstrReturnString: PWideChar;   // LPWSTR optional, out
  uReturnLength: DWORD;   // DWORD
  hwndCallback: THandle   // HWND optional
): DWORD; stdcall;
  external 'WINMM.dll' name 'mciSendStringW';

result := DllCall("WINMM\mciSendStringW"
    , "WStr", lpstrCommand   ; LPCWSTR
    , "Ptr", lpstrReturnString   ; LPWSTR optional, out
    , "UInt", uReturnLength   ; DWORD
    , "Ptr", hwndCallback   ; HWND optional
    , "UInt")   ; return: DWORD

●mciSendStringW(lpstrCommand, lpstrReturnString, uReturnLength, hwndCallback) = DLL("WINMM.dll", "dword mciSendStringW(char*, char*, dword, void*)")
# 呼び出し: mciSendStringW(lpstrCommand, lpstrReturnString, uReturnLength, hwndCallback)
# lpstrCommand : LPCWSTR -> "char*"
# lpstrReturnString : LPWSTR optional, out -> "char*"
# uReturnLength : DWORD -> "dword"
# hwndCallback : HWND optional -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。