GetCurrentPackagePath

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

WIN32_ERROR GetCurrentPackagePath(
    DWORD* pathLength,
    LPWSTR path   // optional
);

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

' pathLength : DWORD* in/out
' path : LPWSTR optional, out
Declare PtrSafe Function GetCurrentPackagePath Lib "kernel32" ( _
    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

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

require 'fiddle'
require 'fiddle/import'

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

#[link(name = "kernel32")]
extern "system" {
    fn GetCurrentPackagePath(
        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 GetCurrentPackagePath(ref uint pathLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder path);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetCurrentPackagePath' -Namespace Win32 -PassThru
# $api::GetCurrentPackagePath(pathLength, path)

#uselib "KERNEL32.dll"
#func global GetCurrentPackagePath "GetCurrentPackagePath" sptr, sptr
; GetCurrentPackagePath varptr(pathLength), varptr(path)   ; 戻り値は stat
; 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 GetCurrentPackagePath "GetCurrentPackagePath" var, var
; res = GetCurrentPackagePath(pathLength, path)
; 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 GetCurrentPackagePath(DWORD* pathLength, LPWSTR path)
#uselib "KERNEL32.dll"
#cfunc global GetCurrentPackagePath "GetCurrentPackagePath" var, var
; res = GetCurrentPackagePath(pathLength, path)
; 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")
	procGetCurrentPackagePath = kernel32.NewProc("GetCurrentPackagePath")
)

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

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

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

●GetCurrentPackagePath(pathLength, path) = DLL("KERNEL32.dll", "dword GetCurrentPackagePath(void*, char*)")
# 呼び出し: GetCurrentPackagePath(pathLength, path)
# 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)。