TcSetFlowA

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

DWORD TcSetFlowA(
    LPSTR pFlowName,
    GUID* pGuidParam,
    DWORD BufferSize,
    void* Buffer
);

<DllImport("TRAFFIC.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function TcSetFlowA(
    <MarshalAs(UnmanagedType.LPStr)> pFlowName As String,   ' LPSTR
    ByRef pGuidParam As Guid,   ' GUID*
    BufferSize As UInteger,   ' DWORD
    Buffer As IntPtr   ' void*
) As UInteger
End Function

' pFlowName : LPSTR
' pGuidParam : GUID*
' BufferSize : DWORD
' Buffer : void*
Declare PtrSafe Function TcSetFlowA Lib "traffic" ( _
    ByVal pFlowName As String, _
    ByVal pGuidParam As LongPtr, _
    ByVal BufferSize 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

TcSetFlowA = ctypes.windll.traffic.TcSetFlowA
TcSetFlowA.restype = wintypes.DWORD
TcSetFlowA.argtypes = [
    wintypes.LPCSTR,  # pFlowName : LPSTR
    ctypes.c_void_p,  # pGuidParam : GUID*
    wintypes.DWORD,  # BufferSize : DWORD
    ctypes.POINTER(None),  # Buffer : void*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('TRAFFIC.dll')
TcSetFlowA = Fiddle::Function.new(
  lib['TcSetFlowA'],
  [
    Fiddle::TYPE_VOIDP,  # pFlowName : LPSTR
    Fiddle::TYPE_VOIDP,  # pGuidParam : GUID*
    -Fiddle::TYPE_INT,  # BufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # Buffer : void*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "traffic")]
extern "system" {
    fn TcSetFlowA(
        pFlowName: *mut u8,  // LPSTR
        pGuidParam: *mut GUID,  // GUID*
        BufferSize: u32,  // DWORD
        Buffer: *mut ()  // void*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("TRAFFIC.dll", CharSet = CharSet.Ansi)]
public static extern uint TcSetFlowA([MarshalAs(UnmanagedType.LPStr)] string pFlowName, ref Guid pGuidParam, uint BufferSize, IntPtr Buffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'TRAFFIC_TcSetFlowA' -Namespace Win32 -PassThru
# $api::TcSetFlowA(pFlowName, pGuidParam, BufferSize, Buffer)

#uselib "TRAFFIC.dll"
#func global TcSetFlowA "TcSetFlowA" sptr, sptr, sptr, sptr
; TcSetFlowA pFlowName, varptr(pGuidParam), BufferSize, Buffer   ; 戻り値は stat
; pFlowName : LPSTR -> "sptr"
; pGuidParam : GUID* -> "sptr"
; BufferSize : DWORD -> "sptr"
; Buffer : void* -> "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 TcSetFlowA "TcSetFlowA" str, var, int, sptr
; res = TcSetFlowA(pFlowName, pGuidParam, BufferSize, Buffer)
; pFlowName : LPSTR -> "str"
; pGuidParam : GUID* -> "var"
; BufferSize : DWORD -> "int"
; Buffer : void* -> "sptr"
; ※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 TcSetFlowA(LPSTR pFlowName, GUID* pGuidParam, DWORD BufferSize, void* Buffer)
#uselib "TRAFFIC.dll"
#cfunc global TcSetFlowA "TcSetFlowA" str, var, int, intptr
; res = TcSetFlowA(pFlowName, pGuidParam, BufferSize, Buffer)
; pFlowName : LPSTR -> "str"
; pGuidParam : GUID* -> "var"
; BufferSize : DWORD -> "int"
; Buffer : void* -> "intptr"
; ※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")
	procTcSetFlowA = traffic.NewProc("TcSetFlowA")
)

// pFlowName (LPSTR), pGuidParam (GUID*), BufferSize (DWORD), Buffer (void*)
r1, _, err := procTcSetFlowA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pFlowName))),
	uintptr(pGuidParam),
	uintptr(BufferSize),
	uintptr(Buffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function TcSetFlowA(
  pFlowName: PAnsiChar;   // LPSTR
  pGuidParam: PGUID;   // GUID*
  BufferSize: DWORD;   // DWORD
  Buffer: Pointer   // void*
): DWORD; stdcall;
  external 'TRAFFIC.dll' name 'TcSetFlowA';

result := DllCall("TRAFFIC\TcSetFlowA"
    , "AStr", pFlowName   ; LPSTR
    , "Ptr", pGuidParam   ; GUID*
    , "UInt", BufferSize   ; DWORD
    , "Ptr", Buffer   ; void*
    , "UInt")   ; return: DWORD

●TcSetFlowA(pFlowName, pGuidParam, BufferSize, Buffer) = DLL("TRAFFIC.dll", "dword TcSetFlowA(char*, void*, dword, void*)")
# 呼び出し: TcSetFlowA(pFlowName, pGuidParam, BufferSize, Buffer)
# pFlowName : LPSTR -> "char*"
# pGuidParam : GUID* -> "void*"
# BufferSize : DWORD -> "dword"
# Buffer : void* -> "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)。