InitVariantFromBuffer

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

HRESULT InitVariantFromBuffer(
    const void* pv,
    DWORD cb,
    VARIANT* pvar
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function InitVariantFromBuffer(
    pv As IntPtr,   ' void*
    cb As UInteger,   ' DWORD
    pvar As IntPtr   ' VARIANT* out
) As Integer
End Function

' pv : void*
' cb : DWORD
' pvar : VARIANT* out
Declare PtrSafe Function InitVariantFromBuffer Lib "propsys" ( _
    ByVal pv As LongPtr, _
    ByVal cb As Long, _
    ByVal pvar 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

InitVariantFromBuffer = ctypes.windll.propsys.InitVariantFromBuffer
InitVariantFromBuffer.restype = ctypes.c_int
InitVariantFromBuffer.argtypes = [
    ctypes.POINTER(None),  # pv : void*
    wintypes.DWORD,  # cb : DWORD
    ctypes.c_void_p,  # pvar : VARIANT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
InitVariantFromBuffer = Fiddle::Function.new(
  lib['InitVariantFromBuffer'],
  [
    Fiddle::TYPE_VOIDP,  # pv : void*
    -Fiddle::TYPE_INT,  # cb : DWORD
    Fiddle::TYPE_VOIDP,  # pvar : VARIANT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "propsys")]
extern "system" {
    fn InitVariantFromBuffer(
        pv: *const (),  // void*
        cb: u32,  // DWORD
        pvar: *mut VARIANT  // VARIANT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int InitVariantFromBuffer(IntPtr pv, uint cb, IntPtr pvar);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_InitVariantFromBuffer' -Namespace Win32 -PassThru
# $api::InitVariantFromBuffer(pv, cb, pvar)

#uselib "PROPSYS.dll"
#func global InitVariantFromBuffer "InitVariantFromBuffer" sptr, sptr, sptr
; InitVariantFromBuffer pv, cb, varptr(pvar)   ; 戻り値は stat
; pv : void* -> "sptr"
; cb : DWORD -> "sptr"
; pvar : VARIANT* 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 "PROPSYS.dll"
#cfunc global InitVariantFromBuffer "InitVariantFromBuffer" sptr, int, var
; res = InitVariantFromBuffer(pv, cb, pvar)
; pv : void* -> "sptr"
; cb : DWORD -> "int"
; pvar : VARIANT* 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 InitVariantFromBuffer(void* pv, DWORD cb, VARIANT* pvar)
#uselib "PROPSYS.dll"
#cfunc global InitVariantFromBuffer "InitVariantFromBuffer" intptr, int, var
; res = InitVariantFromBuffer(pv, cb, pvar)
; pv : void* -> "intptr"
; cb : DWORD -> "int"
; pvar : VARIANT* 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 (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procInitVariantFromBuffer = propsys.NewProc("InitVariantFromBuffer")
)

// pv (void*), cb (DWORD), pvar (VARIANT* out)
r1, _, err := procInitVariantFromBuffer.Call(
	uintptr(pv),
	uintptr(cb),
	uintptr(pvar),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function InitVariantFromBuffer(
  pv: Pointer;   // void*
  cb: DWORD;   // DWORD
  pvar: Pointer   // VARIANT* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'InitVariantFromBuffer';

result := DllCall("PROPSYS\InitVariantFromBuffer"
    , "Ptr", pv   ; void*
    , "UInt", cb   ; DWORD
    , "Ptr", pvar   ; VARIANT* out
    , "Int")   ; return: HRESULT

●InitVariantFromBuffer(pv, cb, pvar) = DLL("PROPSYS.dll", "int InitVariantFromBuffer(void*, dword, void*)")
# 呼び出し: InitVariantFromBuffer(pv, cb, pvar)
# pv : void* -> "void*"
# cb : DWORD -> "dword"
# pvar : VARIANT* 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)。