MsiDatabaseMergeW

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

DWORD MsiDatabaseMergeW(
    MSIHANDLE hDatabase,
    MSIHANDLE hDatabaseMerge,
    LPCWSTR szTableName
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiDatabaseMergeW(
    hDatabase As UInteger,   ' MSIHANDLE
    hDatabaseMerge As UInteger,   ' MSIHANDLE
    <MarshalAs(UnmanagedType.LPWStr)> szTableName As String   ' LPCWSTR
) As UInteger
End Function

' hDatabase : MSIHANDLE
' hDatabaseMerge : MSIHANDLE
' szTableName : LPCWSTR
Declare PtrSafe Function MsiDatabaseMergeW Lib "msi" ( _
    ByVal hDatabase As Long, _
    ByVal hDatabaseMerge As Long, _
    ByVal szTableName As LongPtr) 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

MsiDatabaseMergeW = ctypes.windll.msi.MsiDatabaseMergeW
MsiDatabaseMergeW.restype = wintypes.DWORD
MsiDatabaseMergeW.argtypes = [
    wintypes.DWORD,  # hDatabase : MSIHANDLE
    wintypes.DWORD,  # hDatabaseMerge : MSIHANDLE
    wintypes.LPCWSTR,  # szTableName : LPCWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiDatabaseMergeW = Fiddle::Function.new(
  lib['MsiDatabaseMergeW'],
  [
    -Fiddle::TYPE_INT,  # hDatabase : MSIHANDLE
    -Fiddle::TYPE_INT,  # hDatabaseMerge : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szTableName : LPCWSTR
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiDatabaseMergeW(
        hDatabase: u32,  // MSIHANDLE
        hDatabaseMerge: u32,  // MSIHANDLE
        szTableName: *const u16  // LPCWSTR
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiDatabaseMergeW(uint hDatabase, uint hDatabaseMerge, [MarshalAs(UnmanagedType.LPWStr)] string szTableName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiDatabaseMergeW' -Namespace Win32 -PassThru
# $api::MsiDatabaseMergeW(hDatabase, hDatabaseMerge, szTableName)

#uselib "msi.dll"
#func global MsiDatabaseMergeW "MsiDatabaseMergeW" wptr, wptr, wptr
; MsiDatabaseMergeW hDatabase, hDatabaseMerge, szTableName   ; 戻り値は stat
; hDatabase : MSIHANDLE -> "wptr"
; hDatabaseMerge : MSIHANDLE -> "wptr"
; szTableName : LPCWSTR -> "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 MsiDatabaseMergeW "MsiDatabaseMergeW" int, int, wstr
; res = MsiDatabaseMergeW(hDatabase, hDatabaseMerge, szTableName)
; hDatabase : MSIHANDLE -> "int"
; hDatabaseMerge : MSIHANDLE -> "int"
; szTableName : LPCWSTR -> "wstr"

; DWORD MsiDatabaseMergeW(MSIHANDLE hDatabase, MSIHANDLE hDatabaseMerge, LPCWSTR szTableName)
#uselib "msi.dll"
#cfunc global MsiDatabaseMergeW "MsiDatabaseMergeW" int, int, wstr
; res = MsiDatabaseMergeW(hDatabase, hDatabaseMerge, szTableName)
; hDatabase : MSIHANDLE -> "int"
; hDatabaseMerge : MSIHANDLE -> "int"
; szTableName : LPCWSTR -> "wstr"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiDatabaseMergeW = msi.NewProc("MsiDatabaseMergeW")
)

// hDatabase (MSIHANDLE), hDatabaseMerge (MSIHANDLE), szTableName (LPCWSTR)
r1, _, err := procMsiDatabaseMergeW.Call(
	uintptr(hDatabase),
	uintptr(hDatabaseMerge),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szTableName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiDatabaseMergeW(
  hDatabase: DWORD;   // MSIHANDLE
  hDatabaseMerge: DWORD;   // MSIHANDLE
  szTableName: PWideChar   // LPCWSTR
): DWORD; stdcall;
  external 'msi.dll' name 'MsiDatabaseMergeW';

result := DllCall("msi\MsiDatabaseMergeW"
    , "UInt", hDatabase   ; MSIHANDLE
    , "UInt", hDatabaseMerge   ; MSIHANDLE
    , "WStr", szTableName   ; LPCWSTR
    , "UInt")   ; return: DWORD

●MsiDatabaseMergeW(hDatabase, hDatabaseMerge, szTableName) = DLL("msi.dll", "dword MsiDatabaseMergeW(dword, dword, char*)")
# 呼び出し: MsiDatabaseMergeW(hDatabase, hDatabaseMerge, szTableName)
# hDatabase : MSIHANDLE -> "dword"
# hDatabaseMerge : MSIHANDLE -> "dword"
# szTableName : LPCWSTR -> "char*"
# 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。