DRMGetUsers

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

HRESULT DRMGetUsers(
    DWORD hIssuanceLicense,
    DWORD uIndex,
    DWORD* phUser
);

<DllImport("msdrm.dll", ExactSpelling:=True)>
Public Shared Function DRMGetUsers(
    hIssuanceLicense As UInteger,   ' DWORD
    uIndex As UInteger,   ' DWORD
    ByRef phUser As UInteger   ' DWORD* in/out
) As Integer
End Function

' hIssuanceLicense : DWORD
' uIndex : DWORD
' phUser : DWORD* in/out
Declare PtrSafe Function DRMGetUsers Lib "msdrm" ( _
    ByVal hIssuanceLicense As Long, _
    ByVal uIndex As Long, _
    ByRef phUser 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

DRMGetUsers = ctypes.windll.msdrm.DRMGetUsers
DRMGetUsers.restype = ctypes.c_int
DRMGetUsers.argtypes = [
    wintypes.DWORD,  # hIssuanceLicense : DWORD
    wintypes.DWORD,  # uIndex : DWORD
    ctypes.POINTER(wintypes.DWORD),  # phUser : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msdrm.dll')
DRMGetUsers = Fiddle::Function.new(
  lib['DRMGetUsers'],
  [
    -Fiddle::TYPE_INT,  # hIssuanceLicense : DWORD
    -Fiddle::TYPE_INT,  # uIndex : DWORD
    Fiddle::TYPE_VOIDP,  # phUser : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "msdrm")]
extern "system" {
    fn DRMGetUsers(
        hIssuanceLicense: u32,  // DWORD
        uIndex: u32,  // DWORD
        phUser: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msdrm.dll")]
public static extern int DRMGetUsers(uint hIssuanceLicense, uint uIndex, ref uint phUser);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msdrm_DRMGetUsers' -Namespace Win32 -PassThru
# $api::DRMGetUsers(hIssuanceLicense, uIndex, phUser)

#uselib "msdrm.dll"
#func global DRMGetUsers "DRMGetUsers" sptr, sptr, sptr
; DRMGetUsers hIssuanceLicense, uIndex, varptr(phUser)   ; 戻り値は stat
; hIssuanceLicense : DWORD -> "sptr"
; uIndex : DWORD -> "sptr"
; phUser : 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 "msdrm.dll"
#cfunc global DRMGetUsers "DRMGetUsers" int, int, var
; res = DRMGetUsers(hIssuanceLicense, uIndex, phUser)
; hIssuanceLicense : DWORD -> "int"
; uIndex : DWORD -> "int"
; phUser : 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。

; HRESULT DRMGetUsers(DWORD hIssuanceLicense, DWORD uIndex, DWORD* phUser)
#uselib "msdrm.dll"
#cfunc global DRMGetUsers "DRMGetUsers" int, int, var
; res = DRMGetUsers(hIssuanceLicense, uIndex, phUser)
; hIssuanceLicense : DWORD -> "int"
; uIndex : DWORD -> "int"
; phUser : 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 (
	msdrm = windows.NewLazySystemDLL("msdrm.dll")
	procDRMGetUsers = msdrm.NewProc("DRMGetUsers")
)

// hIssuanceLicense (DWORD), uIndex (DWORD), phUser (DWORD* in/out)
r1, _, err := procDRMGetUsers.Call(
	uintptr(hIssuanceLicense),
	uintptr(uIndex),
	uintptr(phUser),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DRMGetUsers(
  hIssuanceLicense: DWORD;   // DWORD
  uIndex: DWORD;   // DWORD
  phUser: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'msdrm.dll' name 'DRMGetUsers';

result := DllCall("msdrm\DRMGetUsers"
    , "UInt", hIssuanceLicense   ; DWORD
    , "UInt", uIndex   ; DWORD
    , "Ptr", phUser   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●DRMGetUsers(hIssuanceLicense, uIndex, phUser) = DLL("msdrm.dll", "int DRMGetUsers(dword, dword, void*)")
# 呼び出し: DRMGetUsers(hIssuanceLicense, uIndex, phUser)
# hIssuanceLicense : DWORD -> "dword"
# uIndex : DWORD -> "dword"
# phUser : 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)。