GetTcpTable

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

DWORD GetTcpTable(
    MIB_TCPTABLE* TcpTable,   // optional
    DWORD* SizePointer,
    BOOL Order
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function GetTcpTable(
    TcpTable As IntPtr,   ' MIB_TCPTABLE* optional, out
    ByRef SizePointer As UInteger,   ' DWORD* in/out
    Order As Boolean   ' BOOL
) As UInteger
End Function

' TcpTable : MIB_TCPTABLE* optional, out
' SizePointer : DWORD* in/out
' Order : BOOL
Declare PtrSafe Function GetTcpTable Lib "iphlpapi" ( _
    ByVal TcpTable As LongPtr, _
    ByRef SizePointer As Long, _
    ByVal Order 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

GetTcpTable = ctypes.windll.iphlpapi.GetTcpTable
GetTcpTable.restype = wintypes.DWORD
GetTcpTable.argtypes = [
    ctypes.c_void_p,  # TcpTable : MIB_TCPTABLE* optional, out
    ctypes.POINTER(wintypes.DWORD),  # SizePointer : DWORD* in/out
    wintypes.BOOL,  # Order : BOOL
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
GetTcpTable = Fiddle::Function.new(
  lib['GetTcpTable'],
  [
    Fiddle::TYPE_VOIDP,  # TcpTable : MIB_TCPTABLE* optional, out
    Fiddle::TYPE_VOIDP,  # SizePointer : DWORD* in/out
    Fiddle::TYPE_INT,  # Order : BOOL
  ],
  -Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn GetTcpTable(
        TcpTable: *mut MIB_TCPTABLE,  // MIB_TCPTABLE* optional, out
        SizePointer: *mut u32,  // DWORD* in/out
        Order: i32  // BOOL
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint GetTcpTable(IntPtr TcpTable, ref uint SizePointer, bool Order);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_GetTcpTable' -Namespace Win32 -PassThru
# $api::GetTcpTable(TcpTable, SizePointer, Order)

#uselib "IPHLPAPI.dll"
#func global GetTcpTable "GetTcpTable" sptr, sptr, sptr
; GetTcpTable varptr(TcpTable), varptr(SizePointer), Order   ; 戻り値は stat
; TcpTable : MIB_TCPTABLE* optional, out -> "sptr"
; SizePointer : DWORD* in/out -> "sptr"
; Order : BOOL -> "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 "IPHLPAPI.dll"
#cfunc global GetTcpTable "GetTcpTable" var, var, int
; res = GetTcpTable(TcpTable, SizePointer, Order)
; TcpTable : MIB_TCPTABLE* optional, out -> "var"
; SizePointer : DWORD* in/out -> "var"
; Order : BOOL -> "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。

; DWORD GetTcpTable(MIB_TCPTABLE* TcpTable, DWORD* SizePointer, BOOL Order)
#uselib "IPHLPAPI.dll"
#cfunc global GetTcpTable "GetTcpTable" var, var, int
; res = GetTcpTable(TcpTable, SizePointer, Order)
; TcpTable : MIB_TCPTABLE* optional, out -> "var"
; SizePointer : DWORD* in/out -> "var"
; Order : BOOL -> "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 (
	iphlpapi = windows.NewLazySystemDLL("IPHLPAPI.dll")
	procGetTcpTable = iphlpapi.NewProc("GetTcpTable")
)

// TcpTable (MIB_TCPTABLE* optional, out), SizePointer (DWORD* in/out), Order (BOOL)
r1, _, err := procGetTcpTable.Call(
	uintptr(TcpTable),
	uintptr(SizePointer),
	uintptr(Order),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetTcpTable(
  TcpTable: Pointer;   // MIB_TCPTABLE* optional, out
  SizePointer: Pointer;   // DWORD* in/out
  Order: BOOL   // BOOL
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'GetTcpTable';

result := DllCall("IPHLPAPI\GetTcpTable"
    , "Ptr", TcpTable   ; MIB_TCPTABLE* optional, out
    , "Ptr", SizePointer   ; DWORD* in/out
    , "Int", Order   ; BOOL
    , "UInt")   ; return: DWORD

●GetTcpTable(TcpTable, SizePointer, Order) = DLL("IPHLPAPI.dll", "dword GetTcpTable(void*, void*, bool)")
# 呼び出し: GetTcpTable(TcpTable, SizePointer, Order)
# TcpTable : MIB_TCPTABLE* optional, out -> "void*"
# SizePointer : DWORD* in/out -> "void*"
# Order : BOOL -> "bool"
# 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)。