TcGetFlowNameW

// TRAFFIC.dll  (Unicode / -W)
#include <windows.h>

DWORD TcGetFlowNameW(
    HANDLE FlowHandle,
    DWORD StrSize,
    LPWSTR pFlowName
);

<DllImport("TRAFFIC.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function TcGetFlowNameW(
    FlowHandle As IntPtr,   ' HANDLE
    StrSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pFlowName As System.Text.StringBuilder   ' LPWSTR out
) As UInteger
End Function

' FlowHandle : HANDLE
' StrSize : DWORD
' pFlowName : LPWSTR out
Declare PtrSafe Function TcGetFlowNameW Lib "traffic" ( _
    ByVal FlowHandle As LongPtr, _
    ByVal StrSize As Long, _
    ByVal pFlowName As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

TcGetFlowNameW = ctypes.windll.traffic.TcGetFlowNameW
TcGetFlowNameW.restype = wintypes.DWORD
TcGetFlowNameW.argtypes = [
    wintypes.HANDLE,  # FlowHandle : HANDLE
    wintypes.DWORD,  # StrSize : DWORD
    wintypes.LPWSTR,  # pFlowName : LPWSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('TRAFFIC.dll')
TcGetFlowNameW = Fiddle::Function.new(
  lib['TcGetFlowNameW'],
  [
    Fiddle::TYPE_VOIDP,  # FlowHandle : HANDLE
    -Fiddle::TYPE_INT,  # StrSize : DWORD
    Fiddle::TYPE_VOIDP,  # pFlowName : LPWSTR out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "traffic")]
extern "system" {
    fn TcGetFlowNameW(
        FlowHandle: *mut core::ffi::c_void,  // HANDLE
        StrSize: u32,  // DWORD
        pFlowName: *mut u16  // LPWSTR out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("TRAFFIC.dll", CharSet = CharSet.Unicode)]
public static extern uint TcGetFlowNameW(IntPtr FlowHandle, uint StrSize, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pFlowName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'TRAFFIC_TcGetFlowNameW' -Namespace Win32 -PassThru
# $api::TcGetFlowNameW(FlowHandle, StrSize, pFlowName)

#uselib "TRAFFIC.dll"
#func global TcGetFlowNameW "TcGetFlowNameW" wptr, wptr, wptr
; TcGetFlowNameW FlowHandle, StrSize, varptr(pFlowName)   ; 戻り値は stat
; FlowHandle : HANDLE -> "wptr"
; StrSize : DWORD -> "wptr"
; pFlowName : LPWSTR out -> "wptr"
; ※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 TcGetFlowNameW "TcGetFlowNameW" sptr, int, var
; res = TcGetFlowNameW(FlowHandle, StrSize, pFlowName)
; FlowHandle : HANDLE -> "sptr"
; StrSize : DWORD -> "int"
; pFlowName : LPWSTR 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 TcGetFlowNameW(HANDLE FlowHandle, DWORD StrSize, LPWSTR pFlowName)
#uselib "TRAFFIC.dll"
#cfunc global TcGetFlowNameW "TcGetFlowNameW" intptr, int, var
; res = TcGetFlowNameW(FlowHandle, StrSize, pFlowName)
; FlowHandle : HANDLE -> "intptr"
; StrSize : DWORD -> "int"
; pFlowName : LPWSTR 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")
	procTcGetFlowNameW = traffic.NewProc("TcGetFlowNameW")
)

// FlowHandle (HANDLE), StrSize (DWORD), pFlowName (LPWSTR out)
r1, _, err := procTcGetFlowNameW.Call(
	uintptr(FlowHandle),
	uintptr(StrSize),
	uintptr(pFlowName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function TcGetFlowNameW(
  FlowHandle: THandle;   // HANDLE
  StrSize: DWORD;   // DWORD
  pFlowName: PWideChar   // LPWSTR out
): DWORD; stdcall;
  external 'TRAFFIC.dll' name 'TcGetFlowNameW';

result := DllCall("TRAFFIC\TcGetFlowNameW"
    , "Ptr", FlowHandle   ; HANDLE
    , "UInt", StrSize   ; DWORD
    , "Ptr", pFlowName   ; LPWSTR out
    , "UInt")   ; return: DWORD

●TcGetFlowNameW(FlowHandle, StrSize, pFlowName) = DLL("TRAFFIC.dll", "dword TcGetFlowNameW(void*, dword, char*)")
# 呼び出し: TcGetFlowNameW(FlowHandle, StrSize, pFlowName)
# FlowHandle : HANDLE -> "void*"
# StrSize : DWORD -> "dword"
# pFlowName : LPWSTR out -> "char*"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。