VarDecFromStr

// OLEAUT32.dll
#include <windows.h>

HRESULT VarDecFromStr(
    LPCWSTR strIn,
    DWORD lcid,
    DWORD dwFlags,
    DECIMAL* pdecOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarDecFromStr(
    <MarshalAs(UnmanagedType.LPWStr)> strIn As String,   ' LPCWSTR
    lcid As UInteger,   ' DWORD
    dwFlags As UInteger,   ' DWORD
    pdecOut As IntPtr   ' DECIMAL* out
) As Integer
End Function

' strIn : LPCWSTR
' lcid : DWORD
' dwFlags : DWORD
' pdecOut : DECIMAL* out
Declare PtrSafe Function VarDecFromStr Lib "oleaut32" ( _
    ByVal strIn As LongPtr, _
    ByVal lcid As Long, _
    ByVal dwFlags As Long, _
    ByVal pdecOut 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

VarDecFromStr = ctypes.windll.oleaut32.VarDecFromStr
VarDecFromStr.restype = ctypes.c_int
VarDecFromStr.argtypes = [
    wintypes.LPCWSTR,  # strIn : LPCWSTR
    wintypes.DWORD,  # lcid : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # pdecOut : DECIMAL* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarDecFromStr = Fiddle::Function.new(
  lib['VarDecFromStr'],
  [
    Fiddle::TYPE_VOIDP,  # strIn : LPCWSTR
    -Fiddle::TYPE_INT,  # lcid : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pdecOut : DECIMAL* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarDecFromStr(
        strIn: *const u16,  // LPCWSTR
        lcid: u32,  // DWORD
        dwFlags: u32,  // DWORD
        pdecOut: *mut DECIMAL  // DECIMAL* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarDecFromStr([MarshalAs(UnmanagedType.LPWStr)] string strIn, uint lcid, uint dwFlags, IntPtr pdecOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarDecFromStr' -Namespace Win32 -PassThru
# $api::VarDecFromStr(strIn, lcid, dwFlags, pdecOut)

#uselib "OLEAUT32.dll"
#func global VarDecFromStr "VarDecFromStr" sptr, sptr, sptr, sptr
; VarDecFromStr strIn, lcid, dwFlags, varptr(pdecOut)   ; 戻り値は stat
; strIn : LPCWSTR -> "sptr"
; lcid : DWORD -> "sptr"
; dwFlags : DWORD -> "sptr"
; pdecOut : DECIMAL* 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 "OLEAUT32.dll"
#cfunc global VarDecFromStr "VarDecFromStr" wstr, int, int, var
; res = VarDecFromStr(strIn, lcid, dwFlags, pdecOut)
; strIn : LPCWSTR -> "wstr"
; lcid : DWORD -> "int"
; dwFlags : DWORD -> "int"
; pdecOut : DECIMAL* 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 VarDecFromStr(LPCWSTR strIn, DWORD lcid, DWORD dwFlags, DECIMAL* pdecOut)
#uselib "OLEAUT32.dll"
#cfunc global VarDecFromStr "VarDecFromStr" wstr, int, int, var
; res = VarDecFromStr(strIn, lcid, dwFlags, pdecOut)
; strIn : LPCWSTR -> "wstr"
; lcid : DWORD -> "int"
; dwFlags : DWORD -> "int"
; pdecOut : DECIMAL* 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 (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarDecFromStr = oleaut32.NewProc("VarDecFromStr")
)

// strIn (LPCWSTR), lcid (DWORD), dwFlags (DWORD), pdecOut (DECIMAL* out)
r1, _, err := procVarDecFromStr.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(strIn))),
	uintptr(lcid),
	uintptr(dwFlags),
	uintptr(pdecOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarDecFromStr(
  strIn: PWideChar;   // LPCWSTR
  lcid: DWORD;   // DWORD
  dwFlags: DWORD;   // DWORD
  pdecOut: Pointer   // DECIMAL* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDecFromStr';

result := DllCall("OLEAUT32\VarDecFromStr"
    , "WStr", strIn   ; LPCWSTR
    , "UInt", lcid   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pdecOut   ; DECIMAL* out
    , "Int")   ; return: HRESULT

●VarDecFromStr(strIn, lcid, dwFlags, pdecOut) = DLL("OLEAUT32.dll", "int VarDecFromStr(char*, dword, dword, void*)")
# 呼び出し: VarDecFromStr(strIn, lcid, dwFlags, pdecOut)
# strIn : LPCWSTR -> "char*"
# lcid : DWORD -> "dword"
# dwFlags : DWORD -> "dword"
# pdecOut : DECIMAL* 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)。