MsiRecordGetStringW

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

DWORD MsiRecordGetStringW(
    MSIHANDLE hRecord,
    DWORD iField,
    LPWSTR szValueBuf,   // optional
    DWORD* pcchValueBuf   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiRecordGetStringW(
    hRecord As UInteger,   ' MSIHANDLE
    iField As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> szValueBuf As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchValueBuf As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' hRecord : MSIHANDLE
' iField : DWORD
' szValueBuf : LPWSTR optional, out
' pcchValueBuf : DWORD* optional, in/out
Declare PtrSafe Function MsiRecordGetStringW Lib "msi" ( _
    ByVal hRecord As Long, _
    ByVal iField As Long, _
    ByVal szValueBuf As LongPtr, _
    ByVal pcchValueBuf 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

MsiRecordGetStringW = ctypes.windll.msi.MsiRecordGetStringW
MsiRecordGetStringW.restype = wintypes.DWORD
MsiRecordGetStringW.argtypes = [
    wintypes.DWORD,  # hRecord : MSIHANDLE
    wintypes.DWORD,  # iField : DWORD
    wintypes.LPWSTR,  # szValueBuf : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchValueBuf : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiRecordGetStringW = Fiddle::Function.new(
  lib['MsiRecordGetStringW'],
  [
    -Fiddle::TYPE_INT,  # hRecord : MSIHANDLE
    -Fiddle::TYPE_INT,  # iField : DWORD
    Fiddle::TYPE_VOIDP,  # szValueBuf : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchValueBuf : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiRecordGetStringW(
        hRecord: u32,  // MSIHANDLE
        iField: u32,  // DWORD
        szValueBuf: *mut u16,  // LPWSTR optional, out
        pcchValueBuf: *mut u32  // DWORD* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiRecordGetStringW(uint hRecord, uint iField, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szValueBuf, IntPtr pcchValueBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiRecordGetStringW' -Namespace Win32 -PassThru
# $api::MsiRecordGetStringW(hRecord, iField, szValueBuf, pcchValueBuf)

#uselib "msi.dll"
#func global MsiRecordGetStringW "MsiRecordGetStringW" wptr, wptr, wptr, wptr
; MsiRecordGetStringW hRecord, iField, varptr(szValueBuf), varptr(pcchValueBuf)   ; 戻り値は stat
; hRecord : MSIHANDLE -> "wptr"
; iField : DWORD -> "wptr"
; szValueBuf : LPWSTR optional, out -> "wptr"
; pcchValueBuf : DWORD* optional, 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 MsiRecordGetStringW "MsiRecordGetStringW" int, int, var, var
; res = MsiRecordGetStringW(hRecord, iField, szValueBuf, pcchValueBuf)
; hRecord : MSIHANDLE -> "int"
; iField : DWORD -> "int"
; szValueBuf : LPWSTR optional, out -> "var"
; pcchValueBuf : DWORD* optional, 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。

; DWORD MsiRecordGetStringW(MSIHANDLE hRecord, DWORD iField, LPWSTR szValueBuf, DWORD* pcchValueBuf)
#uselib "msi.dll"
#cfunc global MsiRecordGetStringW "MsiRecordGetStringW" int, int, var, var
; res = MsiRecordGetStringW(hRecord, iField, szValueBuf, pcchValueBuf)
; hRecord : MSIHANDLE -> "int"
; iField : DWORD -> "int"
; szValueBuf : LPWSTR optional, out -> "var"
; pcchValueBuf : DWORD* optional, 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 (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiRecordGetStringW = msi.NewProc("MsiRecordGetStringW")
)

// hRecord (MSIHANDLE), iField (DWORD), szValueBuf (LPWSTR optional, out), pcchValueBuf (DWORD* optional, in/out)
r1, _, err := procMsiRecordGetStringW.Call(
	uintptr(hRecord),
	uintptr(iField),
	uintptr(szValueBuf),
	uintptr(pcchValueBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiRecordGetStringW(
  hRecord: DWORD;   // MSIHANDLE
  iField: DWORD;   // DWORD
  szValueBuf: PWideChar;   // LPWSTR optional, out
  pcchValueBuf: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiRecordGetStringW';

result := DllCall("msi\MsiRecordGetStringW"
    , "UInt", hRecord   ; MSIHANDLE
    , "UInt", iField   ; DWORD
    , "Ptr", szValueBuf   ; LPWSTR optional, out
    , "Ptr", pcchValueBuf   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

●MsiRecordGetStringW(hRecord, iField, szValueBuf, pcchValueBuf) = DLL("msi.dll", "dword MsiRecordGetStringW(dword, dword, char*, void*)")
# 呼び出し: MsiRecordGetStringW(hRecord, iField, szValueBuf, pcchValueBuf)
# hRecord : MSIHANDLE -> "dword"
# iField : DWORD -> "dword"
# szValueBuf : LPWSTR optional, out -> "char*"
# pcchValueBuf : DWORD* optional, 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。