TcQueryFlowA

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

DWORD TcQueryFlowA(
    LPSTR pFlowName,
    GUID* pGuidParam,
    DWORD* pBufferSize,
    void* Buffer
);

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

' pFlowName : LPSTR
' pGuidParam : GUID*
' pBufferSize : DWORD* in/out
' Buffer : void* out
Declare PtrSafe Function TcQueryFlowA Lib "traffic" ( _
    ByVal pFlowName As String, _
    ByVal pGuidParam As LongPtr, _
    ByRef pBufferSize 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

TcQueryFlowA = ctypes.windll.traffic.TcQueryFlowA
TcQueryFlowA.restype = wintypes.DWORD
TcQueryFlowA.argtypes = [
    wintypes.LPCSTR,  # pFlowName : LPSTR
    ctypes.c_void_p,  # pGuidParam : GUID*
    ctypes.POINTER(wintypes.DWORD),  # pBufferSize : DWORD* in/out
    ctypes.POINTER(None),  # Buffer : void* out
]

require 'fiddle'
require 'fiddle/import'

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

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

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

#uselib "TRAFFIC.dll"
#func global TcQueryFlowA "TcQueryFlowA" sptr, sptr, sptr, sptr
; TcQueryFlowA pFlowName, varptr(pGuidParam), varptr(pBufferSize), Buffer   ; 戻り値は stat
; pFlowName : LPSTR -> "sptr"
; pGuidParam : GUID* -> "sptr"
; pBufferSize : DWORD* in/out -> "sptr"
; Buffer : void* 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 TcQueryFlowA "TcQueryFlowA" str, var, var, sptr
; res = TcQueryFlowA(pFlowName, pGuidParam, pBufferSize, Buffer)
; pFlowName : LPSTR -> "str"
; pGuidParam : GUID* -> "var"
; pBufferSize : DWORD* in/out -> "var"
; Buffer : void* out -> "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 TcQueryFlowA(LPSTR pFlowName, GUID* pGuidParam, DWORD* pBufferSize, void* Buffer)
#uselib "TRAFFIC.dll"
#cfunc global TcQueryFlowA "TcQueryFlowA" str, var, var, intptr
; res = TcQueryFlowA(pFlowName, pGuidParam, pBufferSize, Buffer)
; pFlowName : LPSTR -> "str"
; pGuidParam : GUID* -> "var"
; pBufferSize : DWORD* in/out -> "var"
; Buffer : void* out -> "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")
	procTcQueryFlowA = traffic.NewProc("TcQueryFlowA")
)

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

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

result := DllCall("TRAFFIC\TcQueryFlowA"
    , "AStr", pFlowName   ; LPSTR
    , "Ptr", pGuidParam   ; GUID*
    , "Ptr", pBufferSize   ; DWORD* in/out
    , "Ptr", Buffer   ; void* out
    , "UInt")   ; return: DWORD

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