MsiGetComponentPathExW

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

INSTALLSTATE MsiGetComponentPathExW(
    LPCWSTR szProductCode,
    LPCWSTR szComponentCode,
    LPCWSTR szUserSid,   // optional
    MSIINSTALLCONTEXT dwContext,   // optional
    LPWSTR lpOutPathBuffer,   // optional
    DWORD* pcchOutPathBuffer   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiGetComponentPathExW(
    <MarshalAs(UnmanagedType.LPWStr)> szProductCode As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szComponentCode As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szUserSid As String,   ' LPCWSTR optional
    dwContext As Integer,   ' MSIINSTALLCONTEXT optional
    <MarshalAs(UnmanagedType.LPWStr)> lpOutPathBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchOutPathBuffer As IntPtr   ' DWORD* optional, in/out
) As Integer
End Function

' szProductCode : LPCWSTR
' szComponentCode : LPCWSTR
' szUserSid : LPCWSTR optional
' dwContext : MSIINSTALLCONTEXT optional
' lpOutPathBuffer : LPWSTR optional, out
' pcchOutPathBuffer : DWORD* optional, in/out
Declare PtrSafe Function MsiGetComponentPathExW Lib "msi" ( _
    ByVal szProductCode As LongPtr, _
    ByVal szComponentCode As LongPtr, _
    ByVal szUserSid As LongPtr, _
    ByVal dwContext As Long, _
    ByVal lpOutPathBuffer As LongPtr, _
    ByVal pcchOutPathBuffer 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

MsiGetComponentPathExW = ctypes.windll.msi.MsiGetComponentPathExW
MsiGetComponentPathExW.restype = ctypes.c_int
MsiGetComponentPathExW.argtypes = [
    wintypes.LPCWSTR,  # szProductCode : LPCWSTR
    wintypes.LPCWSTR,  # szComponentCode : LPCWSTR
    wintypes.LPCWSTR,  # szUserSid : LPCWSTR optional
    ctypes.c_int,  # dwContext : MSIINSTALLCONTEXT optional
    wintypes.LPWSTR,  # lpOutPathBuffer : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchOutPathBuffer : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetComponentPathExW = Fiddle::Function.new(
  lib['MsiGetComponentPathExW'],
  [
    Fiddle::TYPE_VOIDP,  # szProductCode : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szComponentCode : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szUserSid : LPCWSTR optional
    Fiddle::TYPE_INT,  # dwContext : MSIINSTALLCONTEXT optional
    Fiddle::TYPE_VOIDP,  # lpOutPathBuffer : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchOutPathBuffer : DWORD* optional, in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiGetComponentPathExW(
        szProductCode: *const u16,  // LPCWSTR
        szComponentCode: *const u16,  // LPCWSTR
        szUserSid: *const u16,  // LPCWSTR optional
        dwContext: i32,  // MSIINSTALLCONTEXT optional
        lpOutPathBuffer: *mut u16,  // LPWSTR optional, out
        pcchOutPathBuffer: *mut u32  // DWORD* optional, in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern int MsiGetComponentPathExW([MarshalAs(UnmanagedType.LPWStr)] string szProductCode, [MarshalAs(UnmanagedType.LPWStr)] string szComponentCode, [MarshalAs(UnmanagedType.LPWStr)] string szUserSid, int dwContext, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpOutPathBuffer, IntPtr pcchOutPathBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetComponentPathExW' -Namespace Win32 -PassThru
# $api::MsiGetComponentPathExW(szProductCode, szComponentCode, szUserSid, dwContext, lpOutPathBuffer, pcchOutPathBuffer)

#uselib "msi.dll"
#func global MsiGetComponentPathExW "MsiGetComponentPathExW" wptr, wptr, wptr, wptr, wptr, wptr
; MsiGetComponentPathExW szProductCode, szComponentCode, szUserSid, dwContext, varptr(lpOutPathBuffer), varptr(pcchOutPathBuffer)   ; 戻り値は stat
; szProductCode : LPCWSTR -> "wptr"
; szComponentCode : LPCWSTR -> "wptr"
; szUserSid : LPCWSTR optional -> "wptr"
; dwContext : MSIINSTALLCONTEXT optional -> "wptr"
; lpOutPathBuffer : LPWSTR optional, out -> "wptr"
; pcchOutPathBuffer : 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 MsiGetComponentPathExW "MsiGetComponentPathExW" wstr, wstr, wstr, int, var, var
; res = MsiGetComponentPathExW(szProductCode, szComponentCode, szUserSid, dwContext, lpOutPathBuffer, pcchOutPathBuffer)
; szProductCode : LPCWSTR -> "wstr"
; szComponentCode : LPCWSTR -> "wstr"
; szUserSid : LPCWSTR optional -> "wstr"
; dwContext : MSIINSTALLCONTEXT optional -> "int"
; lpOutPathBuffer : LPWSTR optional, out -> "var"
; pcchOutPathBuffer : 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。

; INSTALLSTATE MsiGetComponentPathExW(LPCWSTR szProductCode, LPCWSTR szComponentCode, LPCWSTR szUserSid, MSIINSTALLCONTEXT dwContext, LPWSTR lpOutPathBuffer, DWORD* pcchOutPathBuffer)
#uselib "msi.dll"
#cfunc global MsiGetComponentPathExW "MsiGetComponentPathExW" wstr, wstr, wstr, int, var, var
; res = MsiGetComponentPathExW(szProductCode, szComponentCode, szUserSid, dwContext, lpOutPathBuffer, pcchOutPathBuffer)
; szProductCode : LPCWSTR -> "wstr"
; szComponentCode : LPCWSTR -> "wstr"
; szUserSid : LPCWSTR optional -> "wstr"
; dwContext : MSIINSTALLCONTEXT optional -> "int"
; lpOutPathBuffer : LPWSTR optional, out -> "var"
; pcchOutPathBuffer : 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")
	procMsiGetComponentPathExW = msi.NewProc("MsiGetComponentPathExW")
)

// szProductCode (LPCWSTR), szComponentCode (LPCWSTR), szUserSid (LPCWSTR optional), dwContext (MSIINSTALLCONTEXT optional), lpOutPathBuffer (LPWSTR optional, out), pcchOutPathBuffer (DWORD* optional, in/out)
r1, _, err := procMsiGetComponentPathExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szProductCode))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szComponentCode))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szUserSid))),
	uintptr(dwContext),
	uintptr(lpOutPathBuffer),
	uintptr(pcchOutPathBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INSTALLSTATE

function MsiGetComponentPathExW(
  szProductCode: PWideChar;   // LPCWSTR
  szComponentCode: PWideChar;   // LPCWSTR
  szUserSid: PWideChar;   // LPCWSTR optional
  dwContext: Integer;   // MSIINSTALLCONTEXT optional
  lpOutPathBuffer: PWideChar;   // LPWSTR optional, out
  pcchOutPathBuffer: Pointer   // DWORD* optional, in/out
): Integer; stdcall;
  external 'msi.dll' name 'MsiGetComponentPathExW';

result := DllCall("msi\MsiGetComponentPathExW"
    , "WStr", szProductCode   ; LPCWSTR
    , "WStr", szComponentCode   ; LPCWSTR
    , "WStr", szUserSid   ; LPCWSTR optional
    , "Int", dwContext   ; MSIINSTALLCONTEXT optional
    , "Ptr", lpOutPathBuffer   ; LPWSTR optional, out
    , "Ptr", pcchOutPathBuffer   ; DWORD* optional, in/out
    , "Int")   ; return: INSTALLSTATE

●MsiGetComponentPathExW(szProductCode, szComponentCode, szUserSid, dwContext, lpOutPathBuffer, pcchOutPathBuffer) = DLL("msi.dll", "int MsiGetComponentPathExW(char*, char*, char*, int, char*, void*)")
# 呼び出し: MsiGetComponentPathExW(szProductCode, szComponentCode, szUserSid, dwContext, lpOutPathBuffer, pcchOutPathBuffer)
# szProductCode : LPCWSTR -> "char*"
# szComponentCode : LPCWSTR -> "char*"
# szUserSid : LPCWSTR optional -> "char*"
# dwContext : MSIINSTALLCONTEXT optional -> "int"
# lpOutPathBuffer : LPWSTR optional, out -> "char*"
# pcchOutPathBuffer : 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。