TcEnumerateFlows

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

DWORD TcEnumerateFlows(
    HANDLE IfcHandle,
    HANDLE* pEnumHandle,
    DWORD* pFlowCount,
    DWORD* pBufSize,
    ENUMERATION_BUFFER* Buffer
);

<DllImport("TRAFFIC.dll", ExactSpelling:=True)>
Public Shared Function TcEnumerateFlows(
    IfcHandle As IntPtr,   ' HANDLE
    pEnumHandle As IntPtr,   ' HANDLE* in/out
    ByRef pFlowCount As UInteger,   ' DWORD* in/out
    ByRef pBufSize As UInteger,   ' DWORD* in/out
    Buffer As IntPtr   ' ENUMERATION_BUFFER* out
) As UInteger
End Function

' IfcHandle : HANDLE
' pEnumHandle : HANDLE* in/out
' pFlowCount : DWORD* in/out
' pBufSize : DWORD* in/out
' Buffer : ENUMERATION_BUFFER* out
Declare PtrSafe Function TcEnumerateFlows Lib "traffic" ( _
    ByVal IfcHandle As LongPtr, _
    ByVal pEnumHandle As LongPtr, _
    ByRef pFlowCount As Long, _
    ByRef pBufSize As Long, _
    ByVal Buffer 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

TcEnumerateFlows = ctypes.windll.traffic.TcEnumerateFlows
TcEnumerateFlows.restype = wintypes.DWORD
TcEnumerateFlows.argtypes = [
    wintypes.HANDLE,  # IfcHandle : HANDLE
    ctypes.c_void_p,  # pEnumHandle : HANDLE* in/out
    ctypes.POINTER(wintypes.DWORD),  # pFlowCount : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # pBufSize : DWORD* in/out
    ctypes.c_void_p,  # Buffer : ENUMERATION_BUFFER* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('TRAFFIC.dll')
TcEnumerateFlows = Fiddle::Function.new(
  lib['TcEnumerateFlows'],
  [
    Fiddle::TYPE_VOIDP,  # IfcHandle : HANDLE
    Fiddle::TYPE_VOIDP,  # pEnumHandle : HANDLE* in/out
    Fiddle::TYPE_VOIDP,  # pFlowCount : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # pBufSize : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # Buffer : ENUMERATION_BUFFER* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "traffic")]
extern "system" {
    fn TcEnumerateFlows(
        IfcHandle: *mut core::ffi::c_void,  // HANDLE
        pEnumHandle: *mut *mut core::ffi::c_void,  // HANDLE* in/out
        pFlowCount: *mut u32,  // DWORD* in/out
        pBufSize: *mut u32,  // DWORD* in/out
        Buffer: *mut ENUMERATION_BUFFER  // ENUMERATION_BUFFER* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("TRAFFIC.dll")]
public static extern uint TcEnumerateFlows(IntPtr IfcHandle, IntPtr pEnumHandle, ref uint pFlowCount, ref uint pBufSize, IntPtr Buffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'TRAFFIC_TcEnumerateFlows' -Namespace Win32 -PassThru
# $api::TcEnumerateFlows(IfcHandle, pEnumHandle, pFlowCount, pBufSize, Buffer)

#uselib "TRAFFIC.dll"
#func global TcEnumerateFlows "TcEnumerateFlows" sptr, sptr, sptr, sptr, sptr
; TcEnumerateFlows IfcHandle, pEnumHandle, varptr(pFlowCount), varptr(pBufSize), varptr(Buffer)   ; 戻り値は stat
; IfcHandle : HANDLE -> "sptr"
; pEnumHandle : HANDLE* in/out -> "sptr"
; pFlowCount : DWORD* in/out -> "sptr"
; pBufSize : DWORD* in/out -> "sptr"
; Buffer : ENUMERATION_BUFFER* 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 "TRAFFIC.dll"
#cfunc global TcEnumerateFlows "TcEnumerateFlows" sptr, sptr, var, var, var
; res = TcEnumerateFlows(IfcHandle, pEnumHandle, pFlowCount, pBufSize, Buffer)
; IfcHandle : HANDLE -> "sptr"
; pEnumHandle : HANDLE* in/out -> "sptr"
; pFlowCount : DWORD* in/out -> "var"
; pBufSize : DWORD* in/out -> "var"
; Buffer : ENUMERATION_BUFFER* 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 TcEnumerateFlows(HANDLE IfcHandle, HANDLE* pEnumHandle, DWORD* pFlowCount, DWORD* pBufSize, ENUMERATION_BUFFER* Buffer)
#uselib "TRAFFIC.dll"
#cfunc global TcEnumerateFlows "TcEnumerateFlows" intptr, intptr, var, var, var
; res = TcEnumerateFlows(IfcHandle, pEnumHandle, pFlowCount, pBufSize, Buffer)
; IfcHandle : HANDLE -> "intptr"
; pEnumHandle : HANDLE* in/out -> "intptr"
; pFlowCount : DWORD* in/out -> "var"
; pBufSize : DWORD* in/out -> "var"
; Buffer : ENUMERATION_BUFFER* 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 (
	traffic = windows.NewLazySystemDLL("TRAFFIC.dll")
	procTcEnumerateFlows = traffic.NewProc("TcEnumerateFlows")
)

// IfcHandle (HANDLE), pEnumHandle (HANDLE* in/out), pFlowCount (DWORD* in/out), pBufSize (DWORD* in/out), Buffer (ENUMERATION_BUFFER* out)
r1, _, err := procTcEnumerateFlows.Call(
	uintptr(IfcHandle),
	uintptr(pEnumHandle),
	uintptr(pFlowCount),
	uintptr(pBufSize),
	uintptr(Buffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function TcEnumerateFlows(
  IfcHandle: THandle;   // HANDLE
  pEnumHandle: Pointer;   // HANDLE* in/out
  pFlowCount: Pointer;   // DWORD* in/out
  pBufSize: Pointer;   // DWORD* in/out
  Buffer: Pointer   // ENUMERATION_BUFFER* out
): DWORD; stdcall;
  external 'TRAFFIC.dll' name 'TcEnumerateFlows';

result := DllCall("TRAFFIC\TcEnumerateFlows"
    , "Ptr", IfcHandle   ; HANDLE
    , "Ptr", pEnumHandle   ; HANDLE* in/out
    , "Ptr", pFlowCount   ; DWORD* in/out
    , "Ptr", pBufSize   ; DWORD* in/out
    , "Ptr", Buffer   ; ENUMERATION_BUFFER* out
    , "UInt")   ; return: DWORD

●TcEnumerateFlows(IfcHandle, pEnumHandle, pFlowCount, pBufSize, Buffer) = DLL("TRAFFIC.dll", "dword TcEnumerateFlows(void*, void*, void*, void*, void*)")
# 呼び出し: TcEnumerateFlows(IfcHandle, pEnumHandle, pFlowCount, pBufSize, Buffer)
# IfcHandle : HANDLE -> "void*"
# pEnumHandle : HANDLE* in/out -> "void*"
# pFlowCount : DWORD* in/out -> "void*"
# pBufSize : DWORD* in/out -> "void*"
# Buffer : ENUMERATION_BUFFER* 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)。