midiOutGetVolume

関数

MIDI出力デバイスの現在の音量を取得する。

DLLWINMM.dll呼出規約winapi対応OSWindows 2000 以降

シグネチャ

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

DWORD midiOutGetVolume(
    HMIDIOUT hmo,   // optional
    DWORD* pdwVolume
);

パラメーター

名前	型	方向
hmo	HMIDIOUT	inoptional
pdwVolume	DWORD*	out

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD midiOutGetVolume(
    HMIDIOUT hmo,   // optional
    DWORD* pdwVolume
);

[DllImport("WINMM.dll", ExactSpelling = true)]
static extern uint midiOutGetVolume(
    IntPtr hmo,   // HMIDIOUT optional
    out uint pdwVolume   // DWORD* out
);

<DllImport("WINMM.dll", ExactSpelling:=True)>
Public Shared Function midiOutGetVolume(
    hmo As IntPtr,   ' HMIDIOUT optional
    <Out> ByRef pdwVolume As UInteger   ' DWORD* out
) As UInteger
End Function

' hmo : HMIDIOUT optional
' pdwVolume : DWORD* out
Declare PtrSafe Function midiOutGetVolume Lib "winmm" ( _
    ByVal hmo As LongPtr, _
    ByRef pdwVolume 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

midiOutGetVolume = ctypes.windll.winmm.midiOutGetVolume
midiOutGetVolume.restype = wintypes.DWORD
midiOutGetVolume.argtypes = [
    wintypes.HANDLE,  # hmo : HMIDIOUT optional
    ctypes.POINTER(wintypes.DWORD),  # pdwVolume : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

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

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

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

#uselib "WINMM.dll"
#func global midiOutGetVolume "midiOutGetVolume" sptr, sptr
; midiOutGetVolume hmo, varptr(pdwVolume)   ; 戻り値は stat
; hmo : HMIDIOUT optional -> "sptr"
; pdwVolume : DWORD* out -> "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。

出力引数:

#uselib "WINMM.dll"
#cfunc global midiOutGetVolume "midiOutGetVolume" sptr, var
; res = midiOutGetVolume(hmo, pdwVolume)
; hmo : HMIDIOUT optional -> "sptr"
; pdwVolume : DWORD* out -> "var"
; ※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。#uselib "WINMM.dll"
#cfunc global midiOutGetVolume "midiOutGetVolume" sptr, sptr
; res = midiOutGetVolume(hmo, varptr(pdwVolume))
; hmo : HMIDIOUT optional -> "sptr"
; pdwVolume : DWORD* out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; DWORD midiOutGetVolume(HMIDIOUT hmo, DWORD* pdwVolume)
#uselib "WINMM.dll"
#cfunc global midiOutGetVolume "midiOutGetVolume" intptr, var
; res = midiOutGetVolume(hmo, pdwVolume)
; hmo : HMIDIOUT optional -> "intptr"
; pdwVolume : DWORD* out -> "var"
; ※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 midiOutGetVolume(HMIDIOUT hmo, DWORD* pdwVolume)
#uselib "WINMM.dll"
#cfunc global midiOutGetVolume "midiOutGetVolume" intptr, intptr
; res = midiOutGetVolume(hmo, varptr(pdwVolume))
; hmo : HMIDIOUT optional -> "intptr"
; pdwVolume : DWORD* out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmidiOutGetVolume = winmm.NewProc("midiOutGetVolume")
)

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

function midiOutGetVolume(
  hmo: THandle;   // HMIDIOUT optional
  pdwVolume: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'WINMM.dll' name 'midiOutGetVolume';

result := DllCall("WINMM\midiOutGetVolume"
    , "Ptr", hmo   ; HMIDIOUT optional
    , "Ptr", pdwVolume   ; DWORD* out
    , "UInt")   ; return: DWORD

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