SnmpUtilMemAlloc

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

void* SnmpUtilMemAlloc(
    DWORD nBytes
);

<DllImport("snmpapi.dll", ExactSpelling:=True)>
Public Shared Function SnmpUtilMemAlloc(
    nBytes As UInteger   ' DWORD
) As IntPtr
End Function

' nBytes : DWORD
Declare PtrSafe Function SnmpUtilMemAlloc Lib "snmpapi" ( _
    ByVal nBytes 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

SnmpUtilMemAlloc = ctypes.windll.snmpapi.SnmpUtilMemAlloc
SnmpUtilMemAlloc.restype = ctypes.c_void_p
SnmpUtilMemAlloc.argtypes = [
    wintypes.DWORD,  # nBytes : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('snmpapi.dll')
SnmpUtilMemAlloc = Fiddle::Function.new(
  lib['SnmpUtilMemAlloc'],
  [
    -Fiddle::TYPE_INT,  # nBytes : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "snmpapi")]
extern "system" {
    fn SnmpUtilMemAlloc(
        nBytes: u32  // DWORD
    ) -> *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("snmpapi.dll")]
public static extern IntPtr SnmpUtilMemAlloc(uint nBytes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'snmpapi_SnmpUtilMemAlloc' -Namespace Win32 -PassThru
# $api::SnmpUtilMemAlloc(nBytes)

#uselib "snmpapi.dll"
#func global SnmpUtilMemAlloc "SnmpUtilMemAlloc" sptr
; SnmpUtilMemAlloc nBytes   ; 戻り値は stat
; nBytes : 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 SnmpUtilMemAlloc "SnmpUtilMemAlloc" int
; res = SnmpUtilMemAlloc(nBytes)
; nBytes : DWORD -> "int"

; void* SnmpUtilMemAlloc(DWORD nBytes)
#uselib "snmpapi.dll"
#cfunc global SnmpUtilMemAlloc "SnmpUtilMemAlloc" int
; res = SnmpUtilMemAlloc(nBytes)
; nBytes : DWORD -> "int"

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

var (
	snmpapi = windows.NewLazySystemDLL("snmpapi.dll")
	procSnmpUtilMemAlloc = snmpapi.NewProc("SnmpUtilMemAlloc")
)

// nBytes (DWORD)
r1, _, err := procSnmpUtilMemAlloc.Call(
	uintptr(nBytes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void*

function SnmpUtilMemAlloc(
  nBytes: DWORD   // DWORD
): Pointer; stdcall;
  external 'snmpapi.dll' name 'SnmpUtilMemAlloc';

result := DllCall("snmpapi\SnmpUtilMemAlloc"
    , "UInt", nBytes   ; DWORD
    , "Ptr")   ; return: void*

●SnmpUtilMemAlloc(nBytes) = DLL("snmpapi.dll", "void* SnmpUtilMemAlloc(dword)")
# 呼び出し: SnmpUtilMemAlloc(nBytes)
# nBytes : 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)。