GetIScsiSessionListW

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

DWORD GetIScsiSessionListW(
    DWORD* BufferSize,
    DWORD* SessionCount,
    ISCSI_SESSION_INFOW* SessionInfo
);

<DllImport("ISCSIDSC.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetIScsiSessionListW(
    ByRef BufferSize As UInteger,   ' DWORD* in/out
    ByRef SessionCount As UInteger,   ' DWORD* in/out
    SessionInfo As IntPtr   ' ISCSI_SESSION_INFOW* in/out
) As UInteger
End Function

' BufferSize : DWORD* in/out
' SessionCount : DWORD* in/out
' SessionInfo : ISCSI_SESSION_INFOW* in/out
Declare PtrSafe Function GetIScsiSessionListW Lib "iscsidsc" ( _
    ByRef BufferSize As Long, _
    ByRef SessionCount As Long, _
    ByVal SessionInfo As LongPtr) As Long
' 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

GetIScsiSessionListW = ctypes.windll.iscsidsc.GetIScsiSessionListW
GetIScsiSessionListW.restype = wintypes.DWORD
GetIScsiSessionListW.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # BufferSize : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # SessionCount : DWORD* in/out
    ctypes.c_void_p,  # SessionInfo : ISCSI_SESSION_INFOW* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ISCSIDSC.dll')
GetIScsiSessionListW = Fiddle::Function.new(
  lib['GetIScsiSessionListW'],
  [
    Fiddle::TYPE_VOIDP,  # BufferSize : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # SessionCount : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # SessionInfo : ISCSI_SESSION_INFOW* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "iscsidsc")]
extern "system" {
    fn GetIScsiSessionListW(
        BufferSize: *mut u32,  // DWORD* in/out
        SessionCount: *mut u32,  // DWORD* in/out
        SessionInfo: *mut ISCSI_SESSION_INFOW  // ISCSI_SESSION_INFOW* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ISCSIDSC.dll", CharSet = CharSet.Unicode)]
public static extern uint GetIScsiSessionListW(ref uint BufferSize, ref uint SessionCount, IntPtr SessionInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ISCSIDSC_GetIScsiSessionListW' -Namespace Win32 -PassThru
# $api::GetIScsiSessionListW(BufferSize, SessionCount, SessionInfo)

#uselib "ISCSIDSC.dll"
#func global GetIScsiSessionListW "GetIScsiSessionListW" wptr, wptr, wptr
; GetIScsiSessionListW varptr(BufferSize), varptr(SessionCount), varptr(SessionInfo)   ; 戻り値は stat
; BufferSize : DWORD* in/out -> "wptr"
; SessionCount : DWORD* in/out -> "wptr"
; SessionInfo : ISCSI_SESSION_INFOW* in/out -> "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 "ISCSIDSC.dll"
#cfunc global GetIScsiSessionListW "GetIScsiSessionListW" var, var, var
; res = GetIScsiSessionListW(BufferSize, SessionCount, SessionInfo)
; BufferSize : DWORD* in/out -> "var"
; SessionCount : DWORD* in/out -> "var"
; SessionInfo : ISCSI_SESSION_INFOW* 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。

; DWORD GetIScsiSessionListW(DWORD* BufferSize, DWORD* SessionCount, ISCSI_SESSION_INFOW* SessionInfo)
#uselib "ISCSIDSC.dll"
#cfunc global GetIScsiSessionListW "GetIScsiSessionListW" var, var, var
; res = GetIScsiSessionListW(BufferSize, SessionCount, SessionInfo)
; BufferSize : DWORD* in/out -> "var"
; SessionCount : DWORD* in/out -> "var"
; SessionInfo : ISCSI_SESSION_INFOW* 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 (
	iscsidsc = windows.NewLazySystemDLL("ISCSIDSC.dll")
	procGetIScsiSessionListW = iscsidsc.NewProc("GetIScsiSessionListW")
)

// BufferSize (DWORD* in/out), SessionCount (DWORD* in/out), SessionInfo (ISCSI_SESSION_INFOW* in/out)
r1, _, err := procGetIScsiSessionListW.Call(
	uintptr(BufferSize),
	uintptr(SessionCount),
	uintptr(SessionInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetIScsiSessionListW(
  BufferSize: Pointer;   // DWORD* in/out
  SessionCount: Pointer;   // DWORD* in/out
  SessionInfo: Pointer   // ISCSI_SESSION_INFOW* in/out
): DWORD; stdcall;
  external 'ISCSIDSC.dll' name 'GetIScsiSessionListW';

result := DllCall("ISCSIDSC\GetIScsiSessionListW"
    , "Ptr", BufferSize   ; DWORD* in/out
    , "Ptr", SessionCount   ; DWORD* in/out
    , "Ptr", SessionInfo   ; ISCSI_SESSION_INFOW* in/out
    , "UInt")   ; return: DWORD

●GetIScsiSessionListW(BufferSize, SessionCount, SessionInfo) = DLL("ISCSIDSC.dll", "dword GetIScsiSessionListW(void*, void*, void*)")
# 呼び出し: GetIScsiSessionListW(BufferSize, SessionCount, SessionInfo)
# BufferSize : DWORD* in/out -> "void*"
# SessionCount : DWORD* in/out -> "void*"
# SessionInfo : ISCSI_SESSION_INFOW* 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。