midiOutSetVolume

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

DWORD midiOutSetVolume(
    HMIDIOUT hmo,   // optional
    DWORD dwVolume
);

<DllImport("WINMM.dll", ExactSpelling:=True)>
Public Shared Function midiOutSetVolume(
    hmo As IntPtr,   ' HMIDIOUT optional
    dwVolume As UInteger   ' DWORD
) As UInteger
End Function

' hmo : HMIDIOUT optional
' dwVolume : DWORD
Declare PtrSafe Function midiOutSetVolume Lib "winmm" ( _
    ByVal hmo As LongPtr, _
    ByVal dwVolume As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

midiOutSetVolume = ctypes.windll.winmm.midiOutSetVolume
midiOutSetVolume.restype = wintypes.DWORD
midiOutSetVolume.argtypes = [
    wintypes.HANDLE,  # hmo : HMIDIOUT optional
    wintypes.DWORD,  # dwVolume : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINMM.dll')
midiOutSetVolume = Fiddle::Function.new(
  lib['midiOutSetVolume'],
  [
    Fiddle::TYPE_VOIDP,  # hmo : HMIDIOUT optional
    -Fiddle::TYPE_INT,  # dwVolume : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "winmm")]
extern "system" {
    fn midiOutSetVolume(
        hmo: *mut core::ffi::c_void,  // HMIDIOUT optional
        dwVolume: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINMM.dll")]
public static extern uint midiOutSetVolume(IntPtr hmo, uint dwVolume);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINMM_midiOutSetVolume' -Namespace Win32 -PassThru
# $api::midiOutSetVolume(hmo, dwVolume)

#uselib "WINMM.dll"
#func global midiOutSetVolume "midiOutSetVolume" sptr, sptr
; midiOutSetVolume hmo, dwVolume   ; 戻り値は stat
; hmo : HMIDIOUT optional -> "sptr"
; dwVolume : DWORD -> "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 "WINMM.dll"
#cfunc global midiOutSetVolume "midiOutSetVolume" sptr, int
; res = midiOutSetVolume(hmo, dwVolume)
; hmo : HMIDIOUT optional -> "sptr"
; dwVolume : DWORD -> "int"

; DWORD midiOutSetVolume(HMIDIOUT hmo, DWORD dwVolume)
#uselib "WINMM.dll"
#cfunc global midiOutSetVolume "midiOutSetVolume" intptr, int
; res = midiOutSetVolume(hmo, dwVolume)
; hmo : HMIDIOUT optional -> "intptr"
; dwVolume : DWORD -> "int"

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

var (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmidiOutSetVolume = winmm.NewProc("midiOutSetVolume")
)

// hmo (HMIDIOUT optional), dwVolume (DWORD)
r1, _, err := procmidiOutSetVolume.Call(
	uintptr(hmo),
	uintptr(dwVolume),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function midiOutSetVolume(
  hmo: THandle;   // HMIDIOUT optional
  dwVolume: DWORD   // DWORD
): DWORD; stdcall;
  external 'WINMM.dll' name 'midiOutSetVolume';

result := DllCall("WINMM\midiOutSetVolume"
    , "Ptr", hmo   ; HMIDIOUT optional
    , "UInt", dwVolume   ; DWORD
    , "UInt")   ; return: DWORD

●midiOutSetVolume(hmo, dwVolume) = DLL("WINMM.dll", "dword midiOutSetVolume(void*, dword)")
# 呼び出し: midiOutSetVolume(hmo, dwVolume)
# hmo : HMIDIOUT optional -> "void*"
# dwVolume : 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)。