WHvGetCapability

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

HRESULT WHvGetCapability(
    WHV_CAPABILITY_CODE CapabilityCode,
    void* CapabilityBuffer,
    DWORD CapabilityBufferSizeInBytes,
    DWORD* WrittenSizeInBytes   // optional
);

<DllImport("WinHvPlatform.dll", ExactSpelling:=True)>
Public Shared Function WHvGetCapability(
    CapabilityCode As Integer,   ' WHV_CAPABILITY_CODE
    CapabilityBuffer As IntPtr,   ' void* out
    CapabilityBufferSizeInBytes As UInteger,   ' DWORD
    WrittenSizeInBytes As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' CapabilityCode : WHV_CAPABILITY_CODE
' CapabilityBuffer : void* out
' CapabilityBufferSizeInBytes : DWORD
' WrittenSizeInBytes : DWORD* optional, out
Declare PtrSafe Function WHvGetCapability Lib "winhvplatform" ( _
    ByVal CapabilityCode As Long, _
    ByVal CapabilityBuffer As LongPtr, _
    ByVal CapabilityBufferSizeInBytes As Long, _
    ByVal WrittenSizeInBytes 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

WHvGetCapability = ctypes.windll.winhvplatform.WHvGetCapability
WHvGetCapability.restype = ctypes.c_int
WHvGetCapability.argtypes = [
    ctypes.c_int,  # CapabilityCode : WHV_CAPABILITY_CODE
    ctypes.POINTER(None),  # CapabilityBuffer : void* out
    wintypes.DWORD,  # CapabilityBufferSizeInBytes : DWORD
    ctypes.POINTER(wintypes.DWORD),  # WrittenSizeInBytes : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WinHvPlatform.dll')
WHvGetCapability = Fiddle::Function.new(
  lib['WHvGetCapability'],
  [
    Fiddle::TYPE_INT,  # CapabilityCode : WHV_CAPABILITY_CODE
    Fiddle::TYPE_VOIDP,  # CapabilityBuffer : void* out
    -Fiddle::TYPE_INT,  # CapabilityBufferSizeInBytes : DWORD
    Fiddle::TYPE_VOIDP,  # WrittenSizeInBytes : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "winhvplatform")]
extern "system" {
    fn WHvGetCapability(
        CapabilityCode: i32,  // WHV_CAPABILITY_CODE
        CapabilityBuffer: *mut (),  // void* out
        CapabilityBufferSizeInBytes: u32,  // DWORD
        WrittenSizeInBytes: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WinHvPlatform.dll")]
public static extern int WHvGetCapability(int CapabilityCode, IntPtr CapabilityBuffer, uint CapabilityBufferSizeInBytes, IntPtr WrittenSizeInBytes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WinHvPlatform_WHvGetCapability' -Namespace Win32 -PassThru
# $api::WHvGetCapability(CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, WrittenSizeInBytes)

#uselib "WinHvPlatform.dll"
#func global WHvGetCapability "WHvGetCapability" sptr, sptr, sptr, sptr
; WHvGetCapability CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, varptr(WrittenSizeInBytes)   ; 戻り値は stat
; CapabilityCode : WHV_CAPABILITY_CODE -> "sptr"
; CapabilityBuffer : void* out -> "sptr"
; CapabilityBufferSizeInBytes : DWORD -> "sptr"
; WrittenSizeInBytes : DWORD* optional, 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 "WinHvPlatform.dll"
#cfunc global WHvGetCapability "WHvGetCapability" int, sptr, int, var
; res = WHvGetCapability(CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, WrittenSizeInBytes)
; CapabilityCode : WHV_CAPABILITY_CODE -> "int"
; CapabilityBuffer : void* out -> "sptr"
; CapabilityBufferSizeInBytes : DWORD -> "int"
; WrittenSizeInBytes : DWORD* optional, 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。

; HRESULT WHvGetCapability(WHV_CAPABILITY_CODE CapabilityCode, void* CapabilityBuffer, DWORD CapabilityBufferSizeInBytes, DWORD* WrittenSizeInBytes)
#uselib "WinHvPlatform.dll"
#cfunc global WHvGetCapability "WHvGetCapability" int, intptr, int, var
; res = WHvGetCapability(CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, WrittenSizeInBytes)
; CapabilityCode : WHV_CAPABILITY_CODE -> "int"
; CapabilityBuffer : void* out -> "intptr"
; CapabilityBufferSizeInBytes : DWORD -> "int"
; WrittenSizeInBytes : DWORD* optional, 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 (
	winhvplatform = windows.NewLazySystemDLL("WinHvPlatform.dll")
	procWHvGetCapability = winhvplatform.NewProc("WHvGetCapability")
)

// CapabilityCode (WHV_CAPABILITY_CODE), CapabilityBuffer (void* out), CapabilityBufferSizeInBytes (DWORD), WrittenSizeInBytes (DWORD* optional, out)
r1, _, err := procWHvGetCapability.Call(
	uintptr(CapabilityCode),
	uintptr(CapabilityBuffer),
	uintptr(CapabilityBufferSizeInBytes),
	uintptr(WrittenSizeInBytes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function WHvGetCapability(
  CapabilityCode: Integer;   // WHV_CAPABILITY_CODE
  CapabilityBuffer: Pointer;   // void* out
  CapabilityBufferSizeInBytes: DWORD;   // DWORD
  WrittenSizeInBytes: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'WinHvPlatform.dll' name 'WHvGetCapability';

result := DllCall("WinHvPlatform\WHvGetCapability"
    , "Int", CapabilityCode   ; WHV_CAPABILITY_CODE
    , "Ptr", CapabilityBuffer   ; void* out
    , "UInt", CapabilityBufferSizeInBytes   ; DWORD
    , "Ptr", WrittenSizeInBytes   ; DWORD* optional, out
    , "Int")   ; return: HRESULT

●WHvGetCapability(CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, WrittenSizeInBytes) = DLL("WinHvPlatform.dll", "int WHvGetCapability(int, void*, dword, void*)")
# 呼び出し: WHvGetCapability(CapabilityCode, CapabilityBuffer, CapabilityBufferSizeInBytes, WrittenSizeInBytes)
# CapabilityCode : WHV_CAPABILITY_CODE -> "int"
# CapabilityBuffer : void* out -> "void*"
# CapabilityBufferSizeInBytes : DWORD -> "dword"
# WrittenSizeInBytes : DWORD* optional, 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)。