SnmpUtilIdsToA

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

LPSTR SnmpUtilIdsToA(
    DWORD* Ids,
    DWORD IdLength
);

<DllImport("snmpapi.dll", ExactSpelling:=True)>
Public Shared Function SnmpUtilIdsToA(
    ByRef Ids As UInteger,   ' DWORD* in/out
    IdLength As UInteger   ' DWORD
) As IntPtr
End Function

' Ids : DWORD* in/out
' IdLength : DWORD
Declare PtrSafe Function SnmpUtilIdsToA Lib "snmpapi" ( _
    ByRef Ids As Long, _
    ByVal IdLength As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SnmpUtilIdsToA = ctypes.windll.snmpapi.SnmpUtilIdsToA
SnmpUtilIdsToA.restype = wintypes.LPSTR
SnmpUtilIdsToA.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # Ids : DWORD* in/out
    wintypes.DWORD,  # IdLength : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('snmpapi.dll')
SnmpUtilIdsToA = Fiddle::Function.new(
  lib['SnmpUtilIdsToA'],
  [
    Fiddle::TYPE_VOIDP,  # Ids : DWORD* in/out
    -Fiddle::TYPE_INT,  # IdLength : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "snmpapi")]
extern "system" {
    fn SnmpUtilIdsToA(
        Ids: *mut u32,  // DWORD* in/out
        IdLength: u32  // DWORD
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("snmpapi.dll")]
public static extern IntPtr SnmpUtilIdsToA(ref uint Ids, uint IdLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'snmpapi_SnmpUtilIdsToA' -Namespace Win32 -PassThru
# $api::SnmpUtilIdsToA(Ids, IdLength)

#uselib "snmpapi.dll"
#func global SnmpUtilIdsToA "SnmpUtilIdsToA" sptr, sptr
; SnmpUtilIdsToA varptr(Ids), IdLength   ; 戻り値は stat
; Ids : DWORD* in/out -> "sptr"
; IdLength : DWORD -> "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 "snmpapi.dll"
#cfunc global SnmpUtilIdsToA "SnmpUtilIdsToA" var, int
; res = SnmpUtilIdsToA(Ids, IdLength)
; Ids : DWORD* in/out -> "var"
; IdLength : DWORD -> "int"
; ※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。

; LPSTR SnmpUtilIdsToA(DWORD* Ids, DWORD IdLength)
#uselib "snmpapi.dll"
#cfunc global SnmpUtilIdsToA "SnmpUtilIdsToA" var, int
; res = SnmpUtilIdsToA(Ids, IdLength)
; Ids : DWORD* in/out -> "var"
; IdLength : DWORD -> "int"
; ※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 (
	snmpapi = windows.NewLazySystemDLL("snmpapi.dll")
	procSnmpUtilIdsToA = snmpapi.NewProc("SnmpUtilIdsToA")
)

// Ids (DWORD* in/out), IdLength (DWORD)
r1, _, err := procSnmpUtilIdsToA.Call(
	uintptr(Ids),
	uintptr(IdLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function SnmpUtilIdsToA(
  Ids: Pointer;   // DWORD* in/out
  IdLength: DWORD   // DWORD
): PAnsiChar; stdcall;
  external 'snmpapi.dll' name 'SnmpUtilIdsToA';

result := DllCall("snmpapi\SnmpUtilIdsToA"
    , "Ptr", Ids   ; DWORD* in/out
    , "UInt", IdLength   ; DWORD
    , "Ptr")   ; return: LPSTR

●SnmpUtilIdsToA(Ids, IdLength) = DLL("snmpapi.dll", "char* SnmpUtilIdsToA(void*, dword)")
# 呼び出し: SnmpUtilIdsToA(Ids, IdLength)
# Ids : DWORD* in/out -> "void*"
# IdLength : DWORD -> "dword"
# 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)。