DRMDecode

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

HRESULT DRMDecode(
    LPWSTR wszAlgID,
    LPWSTR wszEncodedString,
    DWORD* puDecodedDataLen,
    BYTE* pbDecodedData
);

<DllImport("msdrm.dll", ExactSpelling:=True)>
Public Shared Function DRMDecode(
    <MarshalAs(UnmanagedType.LPWStr)> wszAlgID As String,   ' LPWSTR
    <MarshalAs(UnmanagedType.LPWStr)> wszEncodedString As String,   ' LPWSTR
    ByRef puDecodedDataLen As UInteger,   ' DWORD* in/out
    pbDecodedData As IntPtr   ' BYTE* in/out
) As Integer
End Function

' wszAlgID : LPWSTR
' wszEncodedString : LPWSTR
' puDecodedDataLen : DWORD* in/out
' pbDecodedData : BYTE* in/out
Declare PtrSafe Function DRMDecode Lib "msdrm" ( _
    ByVal wszAlgID As LongPtr, _
    ByVal wszEncodedString As LongPtr, _
    ByRef puDecodedDataLen As Long, _
    ByVal pbDecodedData 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

DRMDecode = ctypes.windll.msdrm.DRMDecode
DRMDecode.restype = ctypes.c_int
DRMDecode.argtypes = [
    wintypes.LPCWSTR,  # wszAlgID : LPWSTR
    wintypes.LPCWSTR,  # wszEncodedString : LPWSTR
    ctypes.POINTER(wintypes.DWORD),  # puDecodedDataLen : DWORD* in/out
    ctypes.POINTER(ctypes.c_ubyte),  # pbDecodedData : BYTE* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msdrm.dll')
DRMDecode = Fiddle::Function.new(
  lib['DRMDecode'],
  [
    Fiddle::TYPE_VOIDP,  # wszAlgID : LPWSTR
    Fiddle::TYPE_VOIDP,  # wszEncodedString : LPWSTR
    Fiddle::TYPE_VOIDP,  # puDecodedDataLen : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # pbDecodedData : BYTE* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "msdrm")]
extern "system" {
    fn DRMDecode(
        wszAlgID: *mut u16,  // LPWSTR
        wszEncodedString: *mut u16,  // LPWSTR
        puDecodedDataLen: *mut u32,  // DWORD* in/out
        pbDecodedData: *mut u8  // BYTE* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msdrm.dll")]
public static extern int DRMDecode([MarshalAs(UnmanagedType.LPWStr)] string wszAlgID, [MarshalAs(UnmanagedType.LPWStr)] string wszEncodedString, ref uint puDecodedDataLen, IntPtr pbDecodedData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msdrm_DRMDecode' -Namespace Win32 -PassThru
# $api::DRMDecode(wszAlgID, wszEncodedString, puDecodedDataLen, pbDecodedData)

#uselib "msdrm.dll"
#func global DRMDecode "DRMDecode" sptr, sptr, sptr, sptr
; DRMDecode wszAlgID, wszEncodedString, varptr(puDecodedDataLen), varptr(pbDecodedData)   ; 戻り値は stat
; wszAlgID : LPWSTR -> "sptr"
; wszEncodedString : LPWSTR -> "sptr"
; puDecodedDataLen : DWORD* in/out -> "sptr"
; pbDecodedData : BYTE* in/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 "msdrm.dll"
#cfunc global DRMDecode "DRMDecode" wstr, wstr, var, var
; res = DRMDecode(wszAlgID, wszEncodedString, puDecodedDataLen, pbDecodedData)
; wszAlgID : LPWSTR -> "wstr"
; wszEncodedString : LPWSTR -> "wstr"
; puDecodedDataLen : DWORD* in/out -> "var"
; pbDecodedData : BYTE* in/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 DRMDecode(LPWSTR wszAlgID, LPWSTR wszEncodedString, DWORD* puDecodedDataLen, BYTE* pbDecodedData)
#uselib "msdrm.dll"
#cfunc global DRMDecode "DRMDecode" wstr, wstr, var, var
; res = DRMDecode(wszAlgID, wszEncodedString, puDecodedDataLen, pbDecodedData)
; wszAlgID : LPWSTR -> "wstr"
; wszEncodedString : LPWSTR -> "wstr"
; puDecodedDataLen : DWORD* in/out -> "var"
; pbDecodedData : BYTE* in/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 (
	msdrm = windows.NewLazySystemDLL("msdrm.dll")
	procDRMDecode = msdrm.NewProc("DRMDecode")
)

// wszAlgID (LPWSTR), wszEncodedString (LPWSTR), puDecodedDataLen (DWORD* in/out), pbDecodedData (BYTE* in/out)
r1, _, err := procDRMDecode.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(wszAlgID))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(wszEncodedString))),
	uintptr(puDecodedDataLen),
	uintptr(pbDecodedData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DRMDecode(
  wszAlgID: PWideChar;   // LPWSTR
  wszEncodedString: PWideChar;   // LPWSTR
  puDecodedDataLen: Pointer;   // DWORD* in/out
  pbDecodedData: Pointer   // BYTE* in/out
): Integer; stdcall;
  external 'msdrm.dll' name 'DRMDecode';

result := DllCall("msdrm\DRMDecode"
    , "WStr", wszAlgID   ; LPWSTR
    , "WStr", wszEncodedString   ; LPWSTR
    , "Ptr", puDecodedDataLen   ; DWORD* in/out
    , "Ptr", pbDecodedData   ; BYTE* in/out
    , "Int")   ; return: HRESULT

●DRMDecode(wszAlgID, wszEncodedString, puDecodedDataLen, pbDecodedData) = DLL("msdrm.dll", "int DRMDecode(char*, char*, void*, void*)")
# 呼び出し: DRMDecode(wszAlgID, wszEncodedString, puDecodedDataLen, pbDecodedData)
# wszAlgID : LPWSTR -> "char*"
# wszEncodedString : LPWSTR -> "char*"
# puDecodedDataLen : DWORD* in/out -> "void*"
# pbDecodedData : BYTE* in/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)。