GetIScsiSessionListA

// ISCSIDSC.dll  (ANSI / -A)
#include <windows.h>

DWORD GetIScsiSessionListA(
    DWORD* BufferSize,
    DWORD* SessionCount,
    ISCSI_SESSION_INFOA* SessionInfo
);

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

' BufferSize : DWORD* in/out
' SessionCount : DWORD* in/out
' SessionInfo : ISCSI_SESSION_INFOA* in/out
Declare PtrSafe Function GetIScsiSessionListA Lib "iscsidsc" ( _
    ByRef BufferSize As Long, _
    ByRef SessionCount As Long, _
    ByVal SessionInfo As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ISCSIDSC.dll')
GetIScsiSessionListA = Fiddle::Function.new(
  lib['GetIScsiSessionListA'],
  [
    Fiddle::TYPE_VOIDP,  # BufferSize : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # SessionCount : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # SessionInfo : ISCSI_SESSION_INFOA* in/out
  ],
  -Fiddle::TYPE_INT)

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

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

#uselib "ISCSIDSC.dll"
#func global GetIScsiSessionListA "GetIScsiSessionListA" sptr, sptr, sptr
; GetIScsiSessionListA varptr(BufferSize), varptr(SessionCount), varptr(SessionInfo)   ; 戻り値は stat
; BufferSize : DWORD* in/out -> "sptr"
; SessionCount : DWORD* in/out -> "sptr"
; SessionInfo : ISCSI_SESSION_INFOA* 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 "ISCSIDSC.dll"
#cfunc global GetIScsiSessionListA "GetIScsiSessionListA" var, var, var
; res = GetIScsiSessionListA(BufferSize, SessionCount, SessionInfo)
; BufferSize : DWORD* in/out -> "var"
; SessionCount : DWORD* in/out -> "var"
; SessionInfo : ISCSI_SESSION_INFOA* 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 GetIScsiSessionListA(DWORD* BufferSize, DWORD* SessionCount, ISCSI_SESSION_INFOA* SessionInfo)
#uselib "ISCSIDSC.dll"
#cfunc global GetIScsiSessionListA "GetIScsiSessionListA" var, var, var
; res = GetIScsiSessionListA(BufferSize, SessionCount, SessionInfo)
; BufferSize : DWORD* in/out -> "var"
; SessionCount : DWORD* in/out -> "var"
; SessionInfo : ISCSI_SESSION_INFOA* 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")
	procGetIScsiSessionListA = iscsidsc.NewProc("GetIScsiSessionListA")
)

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

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

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

●GetIScsiSessionListA(BufferSize, SessionCount, SessionInfo) = DLL("ISCSIDSC.dll", "dword GetIScsiSessionListA(void*, void*, void*)")
# 呼び出し: GetIScsiSessionListA(BufferSize, SessionCount, SessionInfo)
# BufferSize : DWORD* in/out -> "void*"
# SessionCount : DWORD* in/out -> "void*"
# SessionInfo : ISCSI_SESSION_INFOA* 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)。