StgCreateDocfile

// OLE32.dll
#include <windows.h>

HRESULT StgCreateDocfile(
    LPCWSTR pwcsName,   // optional
    STGM grfMode,
    DWORD reserved,   // optional
    IStorage** ppstgOpen
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function StgCreateDocfile(
    <MarshalAs(UnmanagedType.LPWStr)> pwcsName As String,   ' LPCWSTR optional
    grfMode As UInteger,   ' STGM
    reserved As UInteger,   ' DWORD optional
    ppstgOpen As IntPtr   ' IStorage** out
) As Integer
End Function

' pwcsName : LPCWSTR optional
' grfMode : STGM
' reserved : DWORD optional
' ppstgOpen : IStorage** out
Declare PtrSafe Function StgCreateDocfile Lib "ole32" ( _
    ByVal pwcsName As LongPtr, _
    ByVal grfMode As Long, _
    ByVal reserved As Long, _
    ByVal ppstgOpen 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

StgCreateDocfile = ctypes.windll.ole32.StgCreateDocfile
StgCreateDocfile.restype = ctypes.c_int
StgCreateDocfile.argtypes = [
    wintypes.LPCWSTR,  # pwcsName : LPCWSTR optional
    wintypes.DWORD,  # grfMode : STGM
    wintypes.DWORD,  # reserved : DWORD optional
    ctypes.c_void_p,  # ppstgOpen : IStorage** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
StgCreateDocfile = Fiddle::Function.new(
  lib['StgCreateDocfile'],
  [
    Fiddle::TYPE_VOIDP,  # pwcsName : LPCWSTR optional
    -Fiddle::TYPE_INT,  # grfMode : STGM
    -Fiddle::TYPE_INT,  # reserved : DWORD optional
    Fiddle::TYPE_VOIDP,  # ppstgOpen : IStorage** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn StgCreateDocfile(
        pwcsName: *const u16,  // LPCWSTR optional
        grfMode: u32,  // STGM
        reserved: u32,  // DWORD optional
        ppstgOpen: *mut *mut core::ffi::c_void  // IStorage** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int StgCreateDocfile([MarshalAs(UnmanagedType.LPWStr)] string pwcsName, uint grfMode, uint reserved, IntPtr ppstgOpen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_StgCreateDocfile' -Namespace Win32 -PassThru
# $api::StgCreateDocfile(pwcsName, grfMode, reserved, ppstgOpen)

#uselib "OLE32.dll"
#func global StgCreateDocfile "StgCreateDocfile" sptr, sptr, sptr, sptr
; StgCreateDocfile pwcsName, grfMode, reserved, ppstgOpen   ; 戻り値は stat
; pwcsName : LPCWSTR optional -> "sptr"
; grfMode : STGM -> "sptr"
; reserved : DWORD optional -> "sptr"
; ppstgOpen : IStorage** 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 "OLE32.dll"
#cfunc global StgCreateDocfile "StgCreateDocfile" wstr, int, int, sptr
; res = StgCreateDocfile(pwcsName, grfMode, reserved, ppstgOpen)
; pwcsName : LPCWSTR optional -> "wstr"
; grfMode : STGM -> "int"
; reserved : DWORD optional -> "int"
; ppstgOpen : IStorage** out -> "sptr"

; HRESULT StgCreateDocfile(LPCWSTR pwcsName, STGM grfMode, DWORD reserved, IStorage** ppstgOpen)
#uselib "OLE32.dll"
#cfunc global StgCreateDocfile "StgCreateDocfile" wstr, int, int, intptr
; res = StgCreateDocfile(pwcsName, grfMode, reserved, ppstgOpen)
; pwcsName : LPCWSTR optional -> "wstr"
; grfMode : STGM -> "int"
; reserved : DWORD optional -> "int"
; ppstgOpen : IStorage** out -> "intptr"

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

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procStgCreateDocfile = ole32.NewProc("StgCreateDocfile")
)

// pwcsName (LPCWSTR optional), grfMode (STGM), reserved (DWORD optional), ppstgOpen (IStorage** out)
r1, _, err := procStgCreateDocfile.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwcsName))),
	uintptr(grfMode),
	uintptr(reserved),
	uintptr(ppstgOpen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function StgCreateDocfile(
  pwcsName: PWideChar;   // LPCWSTR optional
  grfMode: DWORD;   // STGM
  reserved: DWORD;   // DWORD optional
  ppstgOpen: Pointer   // IStorage** out
): Integer; stdcall;
  external 'OLE32.dll' name 'StgCreateDocfile';

result := DllCall("OLE32\StgCreateDocfile"
    , "WStr", pwcsName   ; LPCWSTR optional
    , "UInt", grfMode   ; STGM
    , "UInt", reserved   ; DWORD optional
    , "Ptr", ppstgOpen   ; IStorage** out
    , "Int")   ; return: HRESULT

●StgCreateDocfile(pwcsName, grfMode, reserved, ppstgOpen) = DLL("OLE32.dll", "int StgCreateDocfile(char*, dword, dword, void*)")
# 呼び出し: StgCreateDocfile(pwcsName, grfMode, reserved, ppstgOpen)
# pwcsName : LPCWSTR optional -> "char*"
# grfMode : STGM -> "dword"
# reserved : DWORD optional -> "dword"
# ppstgOpen : IStorage** 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)。