PeerGetItemCount

// P2P.dll
#include <windows.h>

HRESULT PeerGetItemCount(
    void* hPeerEnum,
    DWORD* pCount
);

<DllImport("P2P.dll", ExactSpelling:=True)>
Public Shared Function PeerGetItemCount(
    hPeerEnum As IntPtr,   ' void*
    <Out> ByRef pCount As UInteger   ' DWORD* out
) As Integer
End Function

' hPeerEnum : void*
' pCount : DWORD* out
Declare PtrSafe Function PeerGetItemCount Lib "p2p" ( _
    ByVal hPeerEnum As LongPtr, _
    ByRef pCount 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

PeerGetItemCount = ctypes.windll.p2p.PeerGetItemCount
PeerGetItemCount.restype = ctypes.c_int
PeerGetItemCount.argtypes = [
    ctypes.POINTER(None),  # hPeerEnum : void*
    ctypes.POINTER(wintypes.DWORD),  # pCount : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('P2P.dll')
PeerGetItemCount = Fiddle::Function.new(
  lib['PeerGetItemCount'],
  [
    Fiddle::TYPE_VOIDP,  # hPeerEnum : void*
    Fiddle::TYPE_VOIDP,  # pCount : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "p2p")]
extern "system" {
    fn PeerGetItemCount(
        hPeerEnum: *mut (),  // void*
        pCount: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("P2P.dll")]
public static extern int PeerGetItemCount(IntPtr hPeerEnum, out uint pCount);
"@
$api = Add-Type -MemberDefinition $sig -Name 'P2P_PeerGetItemCount' -Namespace Win32 -PassThru
# $api::PeerGetItemCount(hPeerEnum, pCount)

#uselib "P2P.dll"
#func global PeerGetItemCount "PeerGetItemCount" sptr, sptr
; PeerGetItemCount hPeerEnum, varptr(pCount)   ; 戻り値は stat
; hPeerEnum : void* -> "sptr"
; pCount : DWORD* 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。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	p2p = windows.NewLazySystemDLL("P2P.dll")
	procPeerGetItemCount = p2p.NewProc("PeerGetItemCount")
)

// hPeerEnum (void*), pCount (DWORD* out)
r1, _, err := procPeerGetItemCount.Call(
	uintptr(hPeerEnum),
	uintptr(pCount),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function PeerGetItemCount(
  hPeerEnum: Pointer;   // void*
  pCount: Pointer   // DWORD* out
): Integer; stdcall;
  external 'P2P.dll' name 'PeerGetItemCount';

result := DllCall("P2P\PeerGetItemCount"
    , "Ptr", hPeerEnum   ; void*
    , "Ptr", pCount   ; DWORD* out
    , "Int")   ; return: HRESULT

●PeerGetItemCount(hPeerEnum, pCount) = DLL("P2P.dll", "int PeerGetItemCount(void*, void*)")
# 呼び出し: PeerGetItemCount(hPeerEnum, pCount)
# hPeerEnum : void* -> "void*"
# pCount : DWORD* 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)。

const std = @import("std");

extern "p2p" fn PeerGetItemCount(
    hPeerEnum: ?*anyopaque, // void*
    pCount: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) i32;

proc PeerGetItemCount(
    hPeerEnum: pointer,  # void*
    pCount: ptr uint32  # DWORD* out
): int32 {.importc: "PeerGetItemCount", stdcall, dynlib: "P2P.dll".}

pragma(lib, "p2p");
extern(Windows)
int PeerGetItemCount(
    void* hPeerEnum,   // void*
    uint* pCount   // DWORD* out
);

ccall((:PeerGetItemCount, "P2P.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{UInt32}),
      hPeerEnum, pCount)
# hPeerEnum : void* -> Ptr{Cvoid}
# pCount : DWORD* out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t PeerGetItemCount(
    void* hPeerEnum,
    uint32_t* pCount);
]]
local p2p = ffi.load("p2p")
-- p2p.PeerGetItemCount(hPeerEnum, pCount)
-- hPeerEnum : void*
-- pCount : DWORD* out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('P2P.dll');
const PeerGetItemCount = lib.func('__stdcall', 'PeerGetItemCount', 'int32_t', ['void *', 'uint32_t *']);
// PeerGetItemCount(hPeerEnum, pCount)
// hPeerEnum : void* -> 'void *'
// pCount : DWORD* out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("P2P.dll", {
  PeerGetItemCount: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.PeerGetItemCount(hPeerEnum, pCount)
// hPeerEnum : void* -> "pointer"
// pCount : DWORD* out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t PeerGetItemCount(
    void* hPeerEnum,
    uint32_t* pCount);
C, "P2P.dll");
// $ffi->PeerGetItemCount(hPeerEnum, pCount);
// hPeerEnum : void*
// pCount : DWORD* out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface P2p extends StdCallLibrary {
    P2p INSTANCE = Native.load("p2p", P2p.class);
    int PeerGetItemCount(
        Pointer hPeerEnum,   // void*
        IntByReference pCount   // DWORD* out
    );
}

@[Link("p2p")]
lib LibP2P
  fun PeerGetItemCount = PeerGetItemCount(
    hPeerEnum : Void*,   # void*
    pCount : UInt32*   # DWORD* out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef PeerGetItemCountNative = Int32 Function(Pointer<Void>, Pointer<Uint32>);
typedef PeerGetItemCountDart = int Function(Pointer<Void>, Pointer<Uint32>);
final PeerGetItemCount = DynamicLibrary.open('P2P.dll')
    .lookupFunction<PeerGetItemCountNative, PeerGetItemCountDart>('PeerGetItemCount');
// hPeerEnum : void* -> Pointer<Void>
// pCount : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function PeerGetItemCount(
  hPeerEnum: Pointer;   // void*
  pCount: Pointer   // DWORD* out
): Integer; stdcall;
  external 'P2P.dll' name 'PeerGetItemCount';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "PeerGetItemCount"
  c_PeerGetItemCount :: Ptr () -> Ptr Word32 -> IO Int32
-- hPeerEnum : void* -> Ptr ()
-- pCount : DWORD* out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let peergetitemcount =
  foreign "PeerGetItemCount"
    ((ptr void) @-> (ptr uint32_t) @-> returning int32_t)
(* hPeerEnum : void* -> (ptr void) *)
(* pCount : DWORD* out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library p2p (t "P2P.dll"))
(cffi:use-foreign-library p2p)

(cffi:defcfun ("PeerGetItemCount" peer-get-item-count :convention :stdcall) :int32
  (h-peer-enum :pointer)   ; void*
  (p-count :pointer))   ; DWORD* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $PeerGetItemCount = Win32::API::More->new('P2P',
    'int PeerGetItemCount(LPVOID hPeerEnum, LPVOID pCount)');
# my $ret = $PeerGetItemCount->Call($hPeerEnum, $pCount);
# hPeerEnum : void* -> LPVOID
# pCount : DWORD* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。