mmioOpenW

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

HMMIO mmioOpenW(
    LPWSTR pszFileName,   // optional
    MMIOINFO* pmmioinfo,   // optional
    DWORD fdwOpen
);

<DllImport("WINMM.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function mmioOpenW(
    <MarshalAs(UnmanagedType.LPWStr)> pszFileName As System.Text.StringBuilder,   ' LPWSTR optional, in/out
    pmmioinfo As IntPtr,   ' MMIOINFO* optional, in/out
    fdwOpen As UInteger   ' DWORD
) As IntPtr
End Function

' pszFileName : LPWSTR optional, in/out
' pmmioinfo : MMIOINFO* optional, in/out
' fdwOpen : DWORD
Declare PtrSafe Function mmioOpenW Lib "winmm" ( _
    ByVal pszFileName As LongPtr, _
    ByVal pmmioinfo As LongPtr, _
    ByVal fdwOpen As Long) 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

mmioOpenW = ctypes.windll.winmm.mmioOpenW
mmioOpenW.restype = ctypes.c_void_p
mmioOpenW.argtypes = [
    wintypes.LPWSTR,  # pszFileName : LPWSTR optional, in/out
    ctypes.c_void_p,  # pmmioinfo : MMIOINFO* optional, in/out
    wintypes.DWORD,  # fdwOpen : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINMM.dll')
mmioOpenW = Fiddle::Function.new(
  lib['mmioOpenW'],
  [
    Fiddle::TYPE_VOIDP,  # pszFileName : LPWSTR optional, in/out
    Fiddle::TYPE_VOIDP,  # pmmioinfo : MMIOINFO* optional, in/out
    -Fiddle::TYPE_INT,  # fdwOpen : DWORD
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winmm")]
extern "system" {
    fn mmioOpenW(
        pszFileName: *mut u16,  // LPWSTR optional, in/out
        pmmioinfo: *mut MMIOINFO,  // MMIOINFO* optional, in/out
        fdwOpen: u32  // DWORD
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINMM.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr mmioOpenW([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszFileName, IntPtr pmmioinfo, uint fdwOpen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINMM_mmioOpenW' -Namespace Win32 -PassThru
# $api::mmioOpenW(pszFileName, pmmioinfo, fdwOpen)

#uselib "WINMM.dll"
#func global mmioOpenW "mmioOpenW" wptr, wptr, wptr
; mmioOpenW varptr(pszFileName), varptr(pmmioinfo), fdwOpen   ; 戻り値は stat
; pszFileName : LPWSTR optional, in/out -> "wptr"
; pmmioinfo : MMIOINFO* optional, in/out -> "wptr"
; fdwOpen : 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 "WINMM.dll"
#cfunc global mmioOpenW "mmioOpenW" var, var, int
; res = mmioOpenW(pszFileName, pmmioinfo, fdwOpen)
; pszFileName : LPWSTR optional, in/out -> "var"
; pmmioinfo : MMIOINFO* optional, in/out -> "var"
; fdwOpen : 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。

; HMMIO mmioOpenW(LPWSTR pszFileName, MMIOINFO* pmmioinfo, DWORD fdwOpen)
#uselib "WINMM.dll"
#cfunc global mmioOpenW "mmioOpenW" var, var, int
; res = mmioOpenW(pszFileName, pmmioinfo, fdwOpen)
; pszFileName : LPWSTR optional, in/out -> "var"
; pmmioinfo : MMIOINFO* optional, in/out -> "var"
; fdwOpen : 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 (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmmioOpenW = winmm.NewProc("mmioOpenW")
)

// pszFileName (LPWSTR optional, in/out), pmmioinfo (MMIOINFO* optional, in/out), fdwOpen (DWORD)
r1, _, err := procmmioOpenW.Call(
	uintptr(pszFileName),
	uintptr(pmmioinfo),
	uintptr(fdwOpen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HMMIO

function mmioOpenW(
  pszFileName: PWideChar;   // LPWSTR optional, in/out
  pmmioinfo: Pointer;   // MMIOINFO* optional, in/out
  fdwOpen: DWORD   // DWORD
): THandle; stdcall;
  external 'WINMM.dll' name 'mmioOpenW';

result := DllCall("WINMM\mmioOpenW"
    , "Ptr", pszFileName   ; LPWSTR optional, in/out
    , "Ptr", pmmioinfo   ; MMIOINFO* optional, in/out
    , "UInt", fdwOpen   ; DWORD
    , "Ptr")   ; return: HMMIO

●mmioOpenW(pszFileName, pmmioinfo, fdwOpen) = DLL("WINMM.dll", "void* mmioOpenW(char*, void*, dword)")
# 呼び出し: mmioOpenW(pszFileName, pmmioinfo, fdwOpen)
# pszFileName : LPWSTR optional, in/out -> "char*"
# pmmioinfo : MMIOINFO* optional, in/out -> "void*"
# fdwOpen : 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。