MsiEnumPatchesA

// msi.dll  (ANSI / -A)
#include <windows.h>

DWORD MsiEnumPatchesA(
    LPCSTR szProduct,
    DWORD iPatchIndex,
    LPSTR lpPatchBuf,
    LPSTR lpTransformsBuf,
    DWORD* pcchTransformsBuf
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiEnumPatchesA(
    <MarshalAs(UnmanagedType.LPStr)> szProduct As String,   ' LPCSTR
    iPatchIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpPatchBuf As System.Text.StringBuilder,   ' LPSTR out
    <MarshalAs(UnmanagedType.LPStr)> lpTransformsBuf As System.Text.StringBuilder,   ' LPSTR out
    ByRef pcchTransformsBuf As UInteger   ' DWORD* in/out
) As UInteger
End Function

' szProduct : LPCSTR
' iPatchIndex : DWORD
' lpPatchBuf : LPSTR out
' lpTransformsBuf : LPSTR out
' pcchTransformsBuf : DWORD* in/out
Declare PtrSafe Function MsiEnumPatchesA Lib "msi" ( _
    ByVal szProduct As String, _
    ByVal iPatchIndex As Long, _
    ByVal lpPatchBuf As String, _
    ByVal lpTransformsBuf As String, _
    ByRef pcchTransformsBuf As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MsiEnumPatchesA = ctypes.windll.msi.MsiEnumPatchesA
MsiEnumPatchesA.restype = wintypes.DWORD
MsiEnumPatchesA.argtypes = [
    wintypes.LPCSTR,  # szProduct : LPCSTR
    wintypes.DWORD,  # iPatchIndex : DWORD
    wintypes.LPSTR,  # lpPatchBuf : LPSTR out
    wintypes.LPSTR,  # lpTransformsBuf : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # pcchTransformsBuf : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiEnumPatchesA = Fiddle::Function.new(
  lib['MsiEnumPatchesA'],
  [
    Fiddle::TYPE_VOIDP,  # szProduct : LPCSTR
    -Fiddle::TYPE_INT,  # iPatchIndex : DWORD
    Fiddle::TYPE_VOIDP,  # lpPatchBuf : LPSTR out
    Fiddle::TYPE_VOIDP,  # lpTransformsBuf : LPSTR out
    Fiddle::TYPE_VOIDP,  # pcchTransformsBuf : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiEnumPatchesA(
        szProduct: *const u8,  // LPCSTR
        iPatchIndex: u32,  // DWORD
        lpPatchBuf: *mut u8,  // LPSTR out
        lpTransformsBuf: *mut u8,  // LPSTR out
        pcchTransformsBuf: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern uint MsiEnumPatchesA([MarshalAs(UnmanagedType.LPStr)] string szProduct, uint iPatchIndex, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpPatchBuf, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpTransformsBuf, ref uint pcchTransformsBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiEnumPatchesA' -Namespace Win32 -PassThru
# $api::MsiEnumPatchesA(szProduct, iPatchIndex, lpPatchBuf, lpTransformsBuf, pcchTransformsBuf)

#uselib "msi.dll"
#func global MsiEnumPatchesA "MsiEnumPatchesA" sptr, sptr, sptr, sptr, sptr
; MsiEnumPatchesA szProduct, iPatchIndex, varptr(lpPatchBuf), varptr(lpTransformsBuf), varptr(pcchTransformsBuf)   ; 戻り値は stat
; szProduct : LPCSTR -> "sptr"
; iPatchIndex : DWORD -> "sptr"
; lpPatchBuf : LPSTR out -> "sptr"
; lpTransformsBuf : LPSTR out -> "sptr"
; pcchTransformsBuf : DWORD* in/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 "msi.dll"
#cfunc global MsiEnumPatchesA "MsiEnumPatchesA" str, int, var, var, var
; res = MsiEnumPatchesA(szProduct, iPatchIndex, lpPatchBuf, lpTransformsBuf, pcchTransformsBuf)
; szProduct : LPCSTR -> "str"
; iPatchIndex : DWORD -> "int"
; lpPatchBuf : LPSTR out -> "var"
; lpTransformsBuf : LPSTR out -> "var"
; pcchTransformsBuf : DWORD* 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。

; DWORD MsiEnumPatchesA(LPCSTR szProduct, DWORD iPatchIndex, LPSTR lpPatchBuf, LPSTR lpTransformsBuf, DWORD* pcchTransformsBuf)
#uselib "msi.dll"
#cfunc global MsiEnumPatchesA "MsiEnumPatchesA" str, int, var, var, var
; res = MsiEnumPatchesA(szProduct, iPatchIndex, lpPatchBuf, lpTransformsBuf, pcchTransformsBuf)
; szProduct : LPCSTR -> "str"
; iPatchIndex : DWORD -> "int"
; lpPatchBuf : LPSTR out -> "var"
; lpTransformsBuf : LPSTR out -> "var"
; pcchTransformsBuf : DWORD* 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")
	procMsiEnumPatchesA = msi.NewProc("MsiEnumPatchesA")
)

// szProduct (LPCSTR), iPatchIndex (DWORD), lpPatchBuf (LPSTR out), lpTransformsBuf (LPSTR out), pcchTransformsBuf (DWORD* in/out)
r1, _, err := procMsiEnumPatchesA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szProduct))),
	uintptr(iPatchIndex),
	uintptr(lpPatchBuf),
	uintptr(lpTransformsBuf),
	uintptr(pcchTransformsBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiEnumPatchesA(
  szProduct: PAnsiChar;   // LPCSTR
  iPatchIndex: DWORD;   // DWORD
  lpPatchBuf: PAnsiChar;   // LPSTR out
  lpTransformsBuf: PAnsiChar;   // LPSTR out
  pcchTransformsBuf: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiEnumPatchesA';

result := DllCall("msi\MsiEnumPatchesA"
    , "AStr", szProduct   ; LPCSTR
    , "UInt", iPatchIndex   ; DWORD
    , "Ptr", lpPatchBuf   ; LPSTR out
    , "Ptr", lpTransformsBuf   ; LPSTR out
    , "Ptr", pcchTransformsBuf   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●MsiEnumPatchesA(szProduct, iPatchIndex, lpPatchBuf, lpTransformsBuf, pcchTransformsBuf) = DLL("msi.dll", "dword MsiEnumPatchesA(char*, dword, char*, char*, void*)")
# 呼び出し: MsiEnumPatchesA(szProduct, iPatchIndex, lpPatchBuf, lpTransformsBuf, pcchTransformsBuf)
# szProduct : LPCSTR -> "char*"
# iPatchIndex : DWORD -> "dword"
# lpPatchBuf : LPSTR out -> "char*"
# lpTransformsBuf : LPSTR out -> "char*"
# pcchTransformsBuf : DWORD* 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)。