MsiOpenDatabaseW

// msi.dll  (Unicode / -W)
#include <windows.h>

DWORD MsiOpenDatabaseW(
    LPCWSTR szDatabasePath,
    LPCWSTR szPersist,
    MSIHANDLE* phDatabase
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiOpenDatabaseW(
    <MarshalAs(UnmanagedType.LPWStr)> szDatabasePath As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szPersist As String,   ' LPCWSTR
    ByRef phDatabase As UInteger   ' MSIHANDLE* in/out
) As UInteger
End Function

' szDatabasePath : LPCWSTR
' szPersist : LPCWSTR
' phDatabase : MSIHANDLE* in/out
Declare PtrSafe Function MsiOpenDatabaseW Lib "msi" ( _
    ByVal szDatabasePath As LongPtr, _
    ByVal szPersist As LongPtr, _
    ByRef phDatabase As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MsiOpenDatabaseW = ctypes.windll.msi.MsiOpenDatabaseW
MsiOpenDatabaseW.restype = wintypes.DWORD
MsiOpenDatabaseW.argtypes = [
    wintypes.LPCWSTR,  # szDatabasePath : LPCWSTR
    wintypes.LPCWSTR,  # szPersist : LPCWSTR
    ctypes.c_void_p,  # phDatabase : MSIHANDLE* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiOpenDatabaseW = Fiddle::Function.new(
  lib['MsiOpenDatabaseW'],
  [
    Fiddle::TYPE_VOIDP,  # szDatabasePath : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szPersist : LPCWSTR
    Fiddle::TYPE_VOIDP,  # phDatabase : MSIHANDLE* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiOpenDatabaseW(
        szDatabasePath: *const u16,  // LPCWSTR
        szPersist: *const u16,  // LPCWSTR
        phDatabase: *mut u32  // MSIHANDLE* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiOpenDatabaseW([MarshalAs(UnmanagedType.LPWStr)] string szDatabasePath, [MarshalAs(UnmanagedType.LPWStr)] string szPersist, ref uint phDatabase);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiOpenDatabaseW' -Namespace Win32 -PassThru
# $api::MsiOpenDatabaseW(szDatabasePath, szPersist, phDatabase)

#uselib "msi.dll"
#func global MsiOpenDatabaseW "MsiOpenDatabaseW" wptr, wptr, wptr
; MsiOpenDatabaseW szDatabasePath, szPersist, phDatabase   ; 戻り値は stat
; szDatabasePath : LPCWSTR -> "wptr"
; szPersist : LPCWSTR -> "wptr"
; phDatabase : MSIHANDLE* in/out -> "wptr"
; ※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 "msi.dll"
#cfunc global MsiOpenDatabaseW "MsiOpenDatabaseW" wstr, wstr, int
; res = MsiOpenDatabaseW(szDatabasePath, szPersist, phDatabase)
; szDatabasePath : LPCWSTR -> "wstr"
; szPersist : LPCWSTR -> "wstr"
; phDatabase : MSIHANDLE* in/out -> "int"

; DWORD MsiOpenDatabaseW(LPCWSTR szDatabasePath, LPCWSTR szPersist, MSIHANDLE* phDatabase)
#uselib "msi.dll"
#cfunc global MsiOpenDatabaseW "MsiOpenDatabaseW" wstr, wstr, int
; res = MsiOpenDatabaseW(szDatabasePath, szPersist, phDatabase)
; szDatabasePath : LPCWSTR -> "wstr"
; szPersist : LPCWSTR -> "wstr"
; phDatabase : MSIHANDLE* in/out -> "int"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiOpenDatabaseW = msi.NewProc("MsiOpenDatabaseW")
)

// szDatabasePath (LPCWSTR), szPersist (LPCWSTR), phDatabase (MSIHANDLE* in/out)
r1, _, err := procMsiOpenDatabaseW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szDatabasePath))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szPersist))),
	uintptr(phDatabase),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiOpenDatabaseW(
  szDatabasePath: PWideChar;   // LPCWSTR
  szPersist: PWideChar;   // LPCWSTR
  phDatabase: Pointer   // MSIHANDLE* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiOpenDatabaseW';

result := DllCall("msi\MsiOpenDatabaseW"
    , "WStr", szDatabasePath   ; LPCWSTR
    , "WStr", szPersist   ; LPCWSTR
    , "Ptr", phDatabase   ; MSIHANDLE* in/out
    , "UInt")   ; return: DWORD

●MsiOpenDatabaseW(szDatabasePath, szPersist, phDatabase) = DLL("msi.dll", "dword MsiOpenDatabaseW(char*, char*, void*)")
# 呼び出し: MsiOpenDatabaseW(szDatabasePath, szPersist, phDatabase)
# szDatabasePath : LPCWSTR -> "char*"
# szPersist : LPCWSTR -> "char*"
# phDatabase : MSIHANDLE* 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。