phoneGetVolume

// TAPI32.dll
#include <windows.h>

INT phoneGetVolume(
    DWORD hPhone,
    DWORD dwHookSwitchDev,
    DWORD* lpdwVolume
);

<DllImport("TAPI32.dll", ExactSpelling:=True)>
Public Shared Function phoneGetVolume(
    hPhone As UInteger,   ' DWORD
    dwHookSwitchDev As UInteger,   ' DWORD
    ByRef lpdwVolume As UInteger   ' DWORD* in/out
) As Integer
End Function

' hPhone : DWORD
' dwHookSwitchDev : DWORD
' lpdwVolume : DWORD* in/out
Declare PtrSafe Function phoneGetVolume Lib "tapi32" ( _
    ByVal hPhone As Long, _
    ByVal dwHookSwitchDev As Long, _
    ByRef lpdwVolume 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

phoneGetVolume = ctypes.windll.tapi32.phoneGetVolume
phoneGetVolume.restype = ctypes.c_int
phoneGetVolume.argtypes = [
    wintypes.DWORD,  # hPhone : DWORD
    wintypes.DWORD,  # dwHookSwitchDev : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpdwVolume : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('TAPI32.dll')
phoneGetVolume = Fiddle::Function.new(
  lib['phoneGetVolume'],
  [
    -Fiddle::TYPE_INT,  # hPhone : DWORD
    -Fiddle::TYPE_INT,  # dwHookSwitchDev : DWORD
    Fiddle::TYPE_VOIDP,  # lpdwVolume : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "tapi32")]
extern "system" {
    fn phoneGetVolume(
        hPhone: u32,  // DWORD
        dwHookSwitchDev: u32,  // DWORD
        lpdwVolume: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("TAPI32.dll")]
public static extern int phoneGetVolume(uint hPhone, uint dwHookSwitchDev, ref uint lpdwVolume);
"@
$api = Add-Type -MemberDefinition $sig -Name 'TAPI32_phoneGetVolume' -Namespace Win32 -PassThru
# $api::phoneGetVolume(hPhone, dwHookSwitchDev, lpdwVolume)

#uselib "TAPI32.dll"
#func global phoneGetVolume "phoneGetVolume" sptr, sptr, sptr
; phoneGetVolume hPhone, dwHookSwitchDev, varptr(lpdwVolume)   ; 戻り値は stat
; hPhone : DWORD -> "sptr"
; dwHookSwitchDev : DWORD -> "sptr"
; lpdwVolume : DWORD* in/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。

#uselib "TAPI32.dll"
#cfunc global phoneGetVolume "phoneGetVolume" int, int, var
; res = phoneGetVolume(hPhone, dwHookSwitchDev, lpdwVolume)
; hPhone : DWORD -> "int"
; dwHookSwitchDev : DWORD -> "int"
; lpdwVolume : DWORD* in/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。

; INT phoneGetVolume(DWORD hPhone, DWORD dwHookSwitchDev, DWORD* lpdwVolume)
#uselib "TAPI32.dll"
#cfunc global phoneGetVolume "phoneGetVolume" int, int, var
; res = phoneGetVolume(hPhone, dwHookSwitchDev, lpdwVolume)
; hPhone : DWORD -> "int"
; dwHookSwitchDev : DWORD -> "int"
; lpdwVolume : DWORD* in/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。

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

var (
	tapi32 = windows.NewLazySystemDLL("TAPI32.dll")
	procphoneGetVolume = tapi32.NewProc("phoneGetVolume")
)

// hPhone (DWORD), dwHookSwitchDev (DWORD), lpdwVolume (DWORD* in/out)
r1, _, err := procphoneGetVolume.Call(
	uintptr(hPhone),
	uintptr(dwHookSwitchDev),
	uintptr(lpdwVolume),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function phoneGetVolume(
  hPhone: DWORD;   // DWORD
  dwHookSwitchDev: DWORD;   // DWORD
  lpdwVolume: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'TAPI32.dll' name 'phoneGetVolume';

result := DllCall("TAPI32\phoneGetVolume"
    , "UInt", hPhone   ; DWORD
    , "UInt", dwHookSwitchDev   ; DWORD
    , "Ptr", lpdwVolume   ; DWORD* in/out
    , "Int")   ; return: INT

●phoneGetVolume(hPhone, dwHookSwitchDev, lpdwVolume) = DLL("TAPI32.dll", "int phoneGetVolume(dword, dword, void*)")
# 呼び出し: phoneGetVolume(hPhone, dwHookSwitchDev, lpdwVolume)
# hPhone : DWORD -> "dword"
# dwHookSwitchDev : DWORD -> "dword"
# lpdwVolume : DWORD* in/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)。