MsiGetProductCodeW

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

DWORD MsiGetProductCodeW(
    LPCWSTR szComponent,
    LPWSTR lpBuf39
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiGetProductCodeW(
    <MarshalAs(UnmanagedType.LPWStr)> szComponent As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpBuf39 As System.Text.StringBuilder   ' LPWSTR out
) As UInteger
End Function

' szComponent : LPCWSTR
' lpBuf39 : LPWSTR out
Declare PtrSafe Function MsiGetProductCodeW Lib "msi" ( _
    ByVal szComponent As LongPtr, _
    ByVal lpBuf39 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

MsiGetProductCodeW = ctypes.windll.msi.MsiGetProductCodeW
MsiGetProductCodeW.restype = wintypes.DWORD
MsiGetProductCodeW.argtypes = [
    wintypes.LPCWSTR,  # szComponent : LPCWSTR
    wintypes.LPWSTR,  # lpBuf39 : LPWSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetProductCodeW = Fiddle::Function.new(
  lib['MsiGetProductCodeW'],
  [
    Fiddle::TYPE_VOIDP,  # szComponent : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpBuf39 : LPWSTR out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiGetProductCodeW(
        szComponent: *const u16,  // LPCWSTR
        lpBuf39: *mut u16  // LPWSTR out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiGetProductCodeW([MarshalAs(UnmanagedType.LPWStr)] string szComponent, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpBuf39);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetProductCodeW' -Namespace Win32 -PassThru
# $api::MsiGetProductCodeW(szComponent, lpBuf39)

#uselib "msi.dll"
#func global MsiGetProductCodeW "MsiGetProductCodeW" wptr, wptr
; MsiGetProductCodeW szComponent, varptr(lpBuf39)   ; 戻り値は stat
; szComponent : LPCWSTR -> "wptr"
; lpBuf39 : LPWSTR 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 MsiGetProductCodeW "MsiGetProductCodeW" wstr, var
; res = MsiGetProductCodeW(szComponent, lpBuf39)
; szComponent : LPCWSTR -> "wstr"
; lpBuf39 : LPWSTR 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 MsiGetProductCodeW(LPCWSTR szComponent, LPWSTR lpBuf39)
#uselib "msi.dll"
#cfunc global MsiGetProductCodeW "MsiGetProductCodeW" wstr, var
; res = MsiGetProductCodeW(szComponent, lpBuf39)
; szComponent : LPCWSTR -> "wstr"
; lpBuf39 : LPWSTR 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")
	procMsiGetProductCodeW = msi.NewProc("MsiGetProductCodeW")
)

// szComponent (LPCWSTR), lpBuf39 (LPWSTR out)
r1, _, err := procMsiGetProductCodeW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szComponent))),
	uintptr(lpBuf39),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetProductCodeW(
  szComponent: PWideChar;   // LPCWSTR
  lpBuf39: PWideChar   // LPWSTR out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetProductCodeW';

result := DllCall("msi\MsiGetProductCodeW"
    , "WStr", szComponent   ; LPCWSTR
    , "Ptr", lpBuf39   ; LPWSTR out
    , "UInt")   ; return: DWORD

●MsiGetProductCodeW(szComponent, lpBuf39) = DLL("msi.dll", "dword MsiGetProductCodeW(char*, char*)")
# 呼び出し: MsiGetProductCodeW(szComponent, lpBuf39)
# szComponent : LPCWSTR -> "char*"
# lpBuf39 : LPWSTR out -> "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。