GetPackagePath

// KERNEL32.dll
#include <windows.h>

WIN32_ERROR GetPackagePath(
    const PACKAGE_ID* packageId,
    DWORD reserved,   // optional
    DWORD* pathLength,
    LPWSTR path   // optional
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function GetPackagePath(
    packageId As IntPtr,   ' PACKAGE_ID*
    reserved As UInteger,   ' DWORD optional
    ByRef pathLength As UInteger,   ' DWORD* in/out
    <MarshalAs(UnmanagedType.LPWStr)> path As System.Text.StringBuilder   ' LPWSTR optional, out
) As UInteger
End Function

' packageId : PACKAGE_ID*
' reserved : DWORD optional
' pathLength : DWORD* in/out
' path : LPWSTR optional, out
Declare PtrSafe Function GetPackagePath Lib "kernel32" ( _
    ByVal packageId As LongPtr, _
    ByVal reserved As Long, _
    ByRef pathLength As Long, _
    ByVal path As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetPackagePath = ctypes.windll.kernel32.GetPackagePath
GetPackagePath.restype = wintypes.DWORD
GetPackagePath.argtypes = [
    ctypes.c_void_p,  # packageId : PACKAGE_ID*
    wintypes.DWORD,  # reserved : DWORD optional
    ctypes.POINTER(wintypes.DWORD),  # pathLength : DWORD* in/out
    wintypes.LPWSTR,  # path : LPWSTR optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetPackagePath = Fiddle::Function.new(
  lib['GetPackagePath'],
  [
    Fiddle::TYPE_VOIDP,  # packageId : PACKAGE_ID*
    -Fiddle::TYPE_INT,  # reserved : DWORD optional
    Fiddle::TYPE_VOIDP,  # pathLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # path : LPWSTR optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetPackagePath(
        packageId: *const PACKAGE_ID,  // PACKAGE_ID*
        reserved: u32,  // DWORD optional
        pathLength: *mut u32,  // DWORD* in/out
        path: *mut u16  // LPWSTR optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern uint GetPackagePath(IntPtr packageId, uint reserved, ref uint pathLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder path);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetPackagePath' -Namespace Win32 -PassThru
# $api::GetPackagePath(packageId, reserved, pathLength, path)

#uselib "KERNEL32.dll"
#func global GetPackagePath "GetPackagePath" sptr, sptr, sptr, sptr
; GetPackagePath varptr(packageId), reserved, varptr(pathLength), varptr(path)   ; 戻り値は stat
; packageId : PACKAGE_ID* -> "sptr"
; reserved : DWORD optional -> "sptr"
; pathLength : DWORD* in/out -> "sptr"
; path : LPWSTR optional, out -> "sptr"
; ※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 "KERNEL32.dll"
#cfunc global GetPackagePath "GetPackagePath" var, int, var, var
; res = GetPackagePath(packageId, reserved, pathLength, path)
; packageId : PACKAGE_ID* -> "var"
; reserved : DWORD optional -> "int"
; pathLength : DWORD* in/out -> "var"
; path : LPWSTR optional, 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。

; WIN32_ERROR GetPackagePath(PACKAGE_ID* packageId, DWORD reserved, DWORD* pathLength, LPWSTR path)
#uselib "KERNEL32.dll"
#cfunc global GetPackagePath "GetPackagePath" var, int, var, var
; res = GetPackagePath(packageId, reserved, pathLength, path)
; packageId : PACKAGE_ID* -> "var"
; reserved : DWORD optional -> "int"
; pathLength : DWORD* in/out -> "var"
; path : LPWSTR optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetPackagePath = kernel32.NewProc("GetPackagePath")
)

// packageId (PACKAGE_ID*), reserved (DWORD optional), pathLength (DWORD* in/out), path (LPWSTR optional, out)
r1, _, err := procGetPackagePath.Call(
	uintptr(packageId),
	uintptr(reserved),
	uintptr(pathLength),
	uintptr(path),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetPackagePath(
  packageId: Pointer;   // PACKAGE_ID*
  reserved: DWORD;   // DWORD optional
  pathLength: Pointer;   // DWORD* in/out
  path: PWideChar   // LPWSTR optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetPackagePath';

result := DllCall("KERNEL32\GetPackagePath"
    , "Ptr", packageId   ; PACKAGE_ID*
    , "UInt", reserved   ; DWORD optional
    , "Ptr", pathLength   ; DWORD* in/out
    , "Ptr", path   ; LPWSTR optional, out
    , "UInt")   ; return: WIN32_ERROR

●GetPackagePath(packageId, reserved, pathLength, path) = DLL("KERNEL32.dll", "dword GetPackagePath(void*, dword, void*, char*)")
# 呼び出し: GetPackagePath(packageId, reserved, pathLength, path)
# packageId : PACKAGE_ID* -> "void*"
# reserved : DWORD optional -> "dword"
# pathLength : DWORD* in/out -> "void*"
# path : LPWSTR optional, 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)。