GetPackageInfo

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

WIN32_ERROR GetPackageInfo(
    _PACKAGE_INFO_REFERENCE* packageInfoReference,
    DWORD flags,
    DWORD* bufferLength,
    BYTE* buffer,   // optional
    DWORD* count   // optional
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function GetPackageInfo(
    packageInfoReference As IntPtr,   ' _PACKAGE_INFO_REFERENCE*
    flags As UInteger,   ' DWORD
    ByRef bufferLength As UInteger,   ' DWORD* in/out
    buffer As IntPtr,   ' BYTE* optional, out
    count As IntPtr   ' DWORD* optional, out
) As UInteger
End Function

' packageInfoReference : _PACKAGE_INFO_REFERENCE*
' flags : DWORD
' bufferLength : DWORD* in/out
' buffer : BYTE* optional, out
' count : DWORD* optional, out
Declare PtrSafe Function GetPackageInfo Lib "kernel32" ( _
    ByVal packageInfoReference As LongPtr, _
    ByVal flags As Long, _
    ByRef bufferLength As Long, _
    ByVal buffer As LongPtr, _
    ByVal count 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

GetPackageInfo = ctypes.windll.kernel32.GetPackageInfo
GetPackageInfo.restype = wintypes.DWORD
GetPackageInfo.argtypes = [
    ctypes.c_void_p,  # packageInfoReference : _PACKAGE_INFO_REFERENCE*
    wintypes.DWORD,  # flags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # bufferLength : DWORD* in/out
    ctypes.POINTER(ctypes.c_ubyte),  # buffer : BYTE* optional, out
    ctypes.POINTER(wintypes.DWORD),  # count : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetPackageInfo = Fiddle::Function.new(
  lib['GetPackageInfo'],
  [
    Fiddle::TYPE_VOIDP,  # packageInfoReference : _PACKAGE_INFO_REFERENCE*
    -Fiddle::TYPE_INT,  # flags : DWORD
    Fiddle::TYPE_VOIDP,  # bufferLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # buffer : BYTE* optional, out
    Fiddle::TYPE_VOIDP,  # count : DWORD* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetPackageInfo(
        packageInfoReference: *mut _PACKAGE_INFO_REFERENCE,  // _PACKAGE_INFO_REFERENCE*
        flags: u32,  // DWORD
        bufferLength: *mut u32,  // DWORD* in/out
        buffer: *mut u8,  // BYTE* optional, out
        count: *mut u32  // DWORD* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern uint GetPackageInfo(IntPtr packageInfoReference, uint flags, ref uint bufferLength, IntPtr buffer, IntPtr count);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetPackageInfo' -Namespace Win32 -PassThru
# $api::GetPackageInfo(packageInfoReference, flags, bufferLength, buffer, count)

#uselib "KERNEL32.dll"
#func global GetPackageInfo "GetPackageInfo" sptr, sptr, sptr, sptr, sptr
; GetPackageInfo varptr(packageInfoReference), flags, varptr(bufferLength), varptr(buffer), varptr(count)   ; 戻り値は stat
; packageInfoReference : _PACKAGE_INFO_REFERENCE* -> "sptr"
; flags : DWORD -> "sptr"
; bufferLength : DWORD* in/out -> "sptr"
; buffer : BYTE* optional, out -> "sptr"
; count : DWORD* 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 GetPackageInfo "GetPackageInfo" var, int, var, var, var
; res = GetPackageInfo(packageInfoReference, flags, bufferLength, buffer, count)
; packageInfoReference : _PACKAGE_INFO_REFERENCE* -> "var"
; flags : DWORD -> "int"
; bufferLength : DWORD* in/out -> "var"
; buffer : BYTE* optional, out -> "var"
; count : DWORD* 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 GetPackageInfo(_PACKAGE_INFO_REFERENCE* packageInfoReference, DWORD flags, DWORD* bufferLength, BYTE* buffer, DWORD* count)
#uselib "KERNEL32.dll"
#cfunc global GetPackageInfo "GetPackageInfo" var, int, var, var, var
; res = GetPackageInfo(packageInfoReference, flags, bufferLength, buffer, count)
; packageInfoReference : _PACKAGE_INFO_REFERENCE* -> "var"
; flags : DWORD -> "int"
; bufferLength : DWORD* in/out -> "var"
; buffer : BYTE* optional, out -> "var"
; count : DWORD* 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")
	procGetPackageInfo = kernel32.NewProc("GetPackageInfo")
)

// packageInfoReference (_PACKAGE_INFO_REFERENCE*), flags (DWORD), bufferLength (DWORD* in/out), buffer (BYTE* optional, out), count (DWORD* optional, out)
r1, _, err := procGetPackageInfo.Call(
	uintptr(packageInfoReference),
	uintptr(flags),
	uintptr(bufferLength),
	uintptr(buffer),
	uintptr(count),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetPackageInfo(
  packageInfoReference: Pointer;   // _PACKAGE_INFO_REFERENCE*
  flags: DWORD;   // DWORD
  bufferLength: Pointer;   // DWORD* in/out
  buffer: Pointer;   // BYTE* optional, out
  count: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetPackageInfo';

result := DllCall("KERNEL32\GetPackageInfo"
    , "Ptr", packageInfoReference   ; _PACKAGE_INFO_REFERENCE*
    , "UInt", flags   ; DWORD
    , "Ptr", bufferLength   ; DWORD* in/out
    , "Ptr", buffer   ; BYTE* optional, out
    , "Ptr", count   ; DWORD* optional, out
    , "UInt")   ; return: WIN32_ERROR

●GetPackageInfo(packageInfoReference, flags, bufferLength, buffer, count) = DLL("KERNEL32.dll", "dword GetPackageInfo(void*, dword, void*, void*, void*)")
# 呼び出し: GetPackageInfo(packageInfoReference, flags, bufferLength, buffer, count)
# packageInfoReference : _PACKAGE_INFO_REFERENCE* -> "void*"
# flags : DWORD -> "dword"
# bufferLength : DWORD* in/out -> "void*"
# buffer : BYTE* optional, out -> "void*"
# count : DWORD* optional, 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)。