MsiEnumComponentsA

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

DWORD MsiEnumComponentsA(
    DWORD iComponentIndex,
    LPSTR lpComponentBuf
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiEnumComponentsA(
    iComponentIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpComponentBuf As System.Text.StringBuilder   ' LPSTR out
) As UInteger
End Function

' iComponentIndex : DWORD
' lpComponentBuf : LPSTR out
Declare PtrSafe Function MsiEnumComponentsA Lib "msi" ( _
    ByVal iComponentIndex As Long, _
    ByVal lpComponentBuf As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MsiEnumComponentsA = ctypes.windll.msi.MsiEnumComponentsA
MsiEnumComponentsA.restype = wintypes.DWORD
MsiEnumComponentsA.argtypes = [
    wintypes.DWORD,  # iComponentIndex : DWORD
    wintypes.LPSTR,  # lpComponentBuf : LPSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiEnumComponentsA = Fiddle::Function.new(
  lib['MsiEnumComponentsA'],
  [
    -Fiddle::TYPE_INT,  # iComponentIndex : DWORD
    Fiddle::TYPE_VOIDP,  # lpComponentBuf : LPSTR out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiEnumComponentsA(
        iComponentIndex: u32,  // DWORD
        lpComponentBuf: *mut u8  // LPSTR out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern uint MsiEnumComponentsA(uint iComponentIndex, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpComponentBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiEnumComponentsA' -Namespace Win32 -PassThru
# $api::MsiEnumComponentsA(iComponentIndex, lpComponentBuf)

#uselib "msi.dll"
#func global MsiEnumComponentsA "MsiEnumComponentsA" sptr, sptr
; MsiEnumComponentsA iComponentIndex, varptr(lpComponentBuf)   ; 戻り値は stat
; iComponentIndex : DWORD -> "sptr"
; lpComponentBuf : LPSTR 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 MsiEnumComponentsA "MsiEnumComponentsA" int, var
; res = MsiEnumComponentsA(iComponentIndex, lpComponentBuf)
; iComponentIndex : DWORD -> "int"
; lpComponentBuf : LPSTR 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 MsiEnumComponentsA(DWORD iComponentIndex, LPSTR lpComponentBuf)
#uselib "msi.dll"
#cfunc global MsiEnumComponentsA "MsiEnumComponentsA" int, var
; res = MsiEnumComponentsA(iComponentIndex, lpComponentBuf)
; iComponentIndex : DWORD -> "int"
; lpComponentBuf : LPSTR 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")
	procMsiEnumComponentsA = msi.NewProc("MsiEnumComponentsA")
)

// iComponentIndex (DWORD), lpComponentBuf (LPSTR out)
r1, _, err := procMsiEnumComponentsA.Call(
	uintptr(iComponentIndex),
	uintptr(lpComponentBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiEnumComponentsA(
  iComponentIndex: DWORD;   // DWORD
  lpComponentBuf: PAnsiChar   // LPSTR out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiEnumComponentsA';

result := DllCall("msi\MsiEnumComponentsA"
    , "UInt", iComponentIndex   ; DWORD
    , "Ptr", lpComponentBuf   ; LPSTR out
    , "UInt")   ; return: DWORD

●MsiEnumComponentsA(iComponentIndex, lpComponentBuf) = DLL("msi.dll", "dword MsiEnumComponentsA(dword, char*)")
# 呼び出し: MsiEnumComponentsA(iComponentIndex, lpComponentBuf)
# iComponentIndex : DWORD -> "dword"
# lpComponentBuf : LPSTR 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)。