mmioInstallIOProcW

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

LPMMIOPROC mmioInstallIOProcW(
    DWORD fccIOProc,
    LPMMIOPROC pIOProc,   // optional
    DWORD dwFlags
);

<DllImport("WINMM.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function mmioInstallIOProcW(
    fccIOProc As UInteger,   ' DWORD
    pIOProc As IntPtr,   ' LPMMIOPROC optional
    dwFlags As UInteger   ' DWORD
) As IntPtr
End Function

' fccIOProc : DWORD
' pIOProc : LPMMIOPROC optional
' dwFlags : DWORD
Declare PtrSafe Function mmioInstallIOProcW Lib "winmm" ( _
    ByVal fccIOProc As Long, _
    ByVal pIOProc As LongPtr, _
    ByVal dwFlags 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

mmioInstallIOProcW = ctypes.windll.winmm.mmioInstallIOProcW
mmioInstallIOProcW.restype = ctypes.c_void_p
mmioInstallIOProcW.argtypes = [
    wintypes.DWORD,  # fccIOProc : DWORD
    ctypes.c_void_p,  # pIOProc : LPMMIOPROC optional
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINMM.dll')
mmioInstallIOProcW = Fiddle::Function.new(
  lib['mmioInstallIOProcW'],
  [
    -Fiddle::TYPE_INT,  # fccIOProc : DWORD
    Fiddle::TYPE_VOIDP,  # pIOProc : LPMMIOPROC optional
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winmm")]
extern "system" {
    fn mmioInstallIOProcW(
        fccIOProc: u32,  // DWORD
        pIOProc: *const core::ffi::c_void,  // LPMMIOPROC optional
        dwFlags: u32  // DWORD
    ) -> *const 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 mmioInstallIOProcW(uint fccIOProc, IntPtr pIOProc, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINMM_mmioInstallIOProcW' -Namespace Win32 -PassThru
# $api::mmioInstallIOProcW(fccIOProc, pIOProc, dwFlags)

#uselib "WINMM.dll"
#func global mmioInstallIOProcW "mmioInstallIOProcW" wptr, wptr, wptr
; mmioInstallIOProcW fccIOProc, pIOProc, dwFlags   ; 戻り値は stat
; fccIOProc : DWORD -> "wptr"
; pIOProc : LPMMIOPROC optional -> "wptr"
; dwFlags : 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 mmioInstallIOProcW "mmioInstallIOProcW" int, sptr, int
; res = mmioInstallIOProcW(fccIOProc, pIOProc, dwFlags)
; fccIOProc : DWORD -> "int"
; pIOProc : LPMMIOPROC optional -> "sptr"
; dwFlags : DWORD -> "int"

; LPMMIOPROC mmioInstallIOProcW(DWORD fccIOProc, LPMMIOPROC pIOProc, DWORD dwFlags)
#uselib "WINMM.dll"
#cfunc global mmioInstallIOProcW "mmioInstallIOProcW" int, intptr, int
; res = mmioInstallIOProcW(fccIOProc, pIOProc, dwFlags)
; fccIOProc : DWORD -> "int"
; pIOProc : LPMMIOPROC optional -> "intptr"
; dwFlags : DWORD -> "int"

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

var (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmmioInstallIOProcW = winmm.NewProc("mmioInstallIOProcW")
)

// fccIOProc (DWORD), pIOProc (LPMMIOPROC optional), dwFlags (DWORD)
r1, _, err := procmmioInstallIOProcW.Call(
	uintptr(fccIOProc),
	uintptr(pIOProc),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPMMIOPROC

function mmioInstallIOProcW(
  fccIOProc: DWORD;   // DWORD
  pIOProc: Pointer;   // LPMMIOPROC optional
  dwFlags: DWORD   // DWORD
): Pointer; stdcall;
  external 'WINMM.dll' name 'mmioInstallIOProcW';

result := DllCall("WINMM\mmioInstallIOProcW"
    , "UInt", fccIOProc   ; DWORD
    , "Ptr", pIOProc   ; LPMMIOPROC optional
    , "UInt", dwFlags   ; DWORD
    , "Ptr")   ; return: LPMMIOPROC

●mmioInstallIOProcW(fccIOProc, pIOProc, dwFlags) = DLL("WINMM.dll", "void* mmioInstallIOProcW(dword, void*, dword)")
# 呼び出し: mmioInstallIOProcW(fccIOProc, pIOProc, dwFlags)
# fccIOProc : DWORD -> "dword"
# pIOProc : LPMMIOPROC optional -> "void*"
# dwFlags : 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。